The Experts below are selected from a list of 231 Experts worldwide ranked by ideXlab platform
Kevin R Mackie - One of the best experts on this subject based on the ideXlab platform.
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Lightweight Solid Decks for Movable Bridges – Phase II
2020Co-Authors: Amir Mirmiran, Sahar Ghasemi, Yulin Xiao, Kevin R Mackie, Munaf Al-ramaheeAbstract:Movable Bridges often include open grid steel deck for its light weight and ease of installation. These decks, however, suffer from poor rideability and high maintenance costs. The primary objective of this research project was to search for a new generation of lightweight solid decks that address these issues. Alternative deck systems, including ultra-high performance concrete (UHPC)-high-strength steel (HSS) deck, and UHPC-fiber reinforced polymer (FRP) deck, and UHPC-FRP hybrid system, were developed and studied in this research. The UHPC-HSS and UHPC-FRP deck system showed a great potential to serve as viable alternatives. Accordingly, this phase of the project covered all studies needed for their design and implementation. Also, suitability of a UHPC-FRP hybrid bridge deck system as an alternative to open-grid steel decks was evaluated. The study confirmed that the proposed deck with only 4-inch overall depth and a self-weight of 20.88 psf for the deck with HSS reinforcement and 18.79 psf for the deck system with carbon fiber reinforced polymer (CFRP) reinforcement meets the strength requirements for a 4-ft. stringer spacing. Additional work is required to ensure the deck with CFRP reinforcement meets the displacement criteria. The deck is not susceptible to punching shear of its thin slab, and fails in a ductile manner. Load distribution among the ribs, whether calculated based on deflections or strains, is consistent for both types of reinforcement. In order to study the long-term behavior of the proposed decks under the effects of a moving wheel load, additional testing was carried out at the Accelerated Pavement Testing (APT) facility of the Florida Department of Transportation in Gainesville, FL. A hybrid section of UHPC and FRP was considered as another alternative in this research. Based on test results, the main failure mode was at the interface with the top UHPC plate. The hybrid system requires additional improvement.
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Experimental Evaluation of Aluminum Bridge Deck System
Journal of Bridge Engineering, 2020Co-Authors: Muhammad Saleem, Amir Mirmiran, Kevin R MackieAbstract:Most of the Movable Bridges in the United States have open grid steel decks, primarily because they are factory assembled, lightweight, and easy to install. Open grid steel decks, however, are not as skid resistant as solid decks. Costly maintenance, high noise levels, poor riding comfort, and susceptibility to vibrations are among the other disadvantages of these decks. The objective of the research presented in this paper is to evaluate an alternative lightweight extruded aluminum deck system that has a solid surface and meets the loading requirements as well as weight and thickness limits for Movable bridge decks. These aluminum deck panels with their tongue and groove connections have previously been used in Europe, mainly in Sweden. A detailed experimental evaluation of the aluminum deck system has been carried out, including static and fatigue load testing on the deck panels, as well as ancillary tests on the connections with the girders. On the basis of the in-depth experimental evaluation and the ...
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a super lightweight uhpc hss deck panel for Movable Bridges
Engineering Structures, 2016Co-Authors: Sahar Ghasemi, Pedram Zohrevand, Amir Mirmiran, Yulin Xiao, Kevin R MackieAbstract:Abstract Movable Bridges often include open grid steel deck for its light weight and ease of installation. These decks, however, suffer from poor rideability and high maintenance costs. In search for a new generation of lightweight solid decks that address these issues, a novel system was recently developed using ultra-high performance concrete (UHPC) in the form of a low-profile asymmetric waffle slab reinforced with high-strength steel (HSS) rebars. The deck was shown as a structurally viable alternative, yet its overall weight including haunches and connections exceeded the weight limits for deck replacement on some existing Movable Bridges. The purpose of this study was to optimize the design of proposed UHPC–HSS deck system to meet the weight limits for existing Movable Bridges. The size and reinforcement of the proposed deck were modified in two phases, and five specimens with single or multiple ribs were tested in simple or two-span configurations. Test results have shown that the optimized section with an overall depth of 102 mm and the main longitudinal reinforcement of No. 16 M (16 mm) can suitably meet the load demand, ductility and serviceability requirements, while staying within the weight limits of 1.0 kN/m 2 for a Movable bridge with a stringer spacing of 1.2 m.
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A super lightweight UHPC–HSS deck panel for Movable Bridges
Engineering Structures, 2016Co-Authors: Sahar Ghasemi, Pedram Zohrevand, Amir Mirmiran, Yulin Xiao, Kevin R MackieAbstract:Abstract Movable Bridges often include open grid steel deck for its light weight and ease of installation. These decks, however, suffer from poor rideability and high maintenance costs. In search for a new generation of lightweight solid decks that address these issues, a novel system was recently developed using ultra-high performance concrete (UHPC) in the form of a low-profile asymmetric waffle slab reinforced with high-strength steel (HSS) rebars. The deck was shown as a structurally viable alternative, yet its overall weight including haunches and connections exceeded the weight limits for deck replacement on some existing Movable Bridges. The purpose of this study was to optimize the design of proposed UHPC–HSS deck system to meet the weight limits for existing Movable Bridges. The size and reinforcement of the proposed deck were modified in two phases, and five specimens with single or multiple ribs were tested in simple or two-span configurations. Test results have shown that the optimized section with an overall depth of 102 mm and the main longitudinal reinforcement of No. 16 M (16 mm) can suitably meet the load demand, ductility and serviceability requirements, while staying within the weight limits of 1.0 kN/m 2 for a Movable bridge with a stringer spacing of 1.2 m.
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lightweight solid decks for Movable Bridges phase ii
2016Co-Authors: Amir Mirmiran, Sahar Ghasemi, Yulin Xiao, Kevin R Mackie, Munaf AlramaheeAbstract:Movable Bridges often include open grid steel deck for its light weight and ease of installation. These decks, however, suffer from poor rideability and high maintenance costs. The primary objective of this research project was to search for a new generation of lightweight solid decks that address these issues. Alternative deck systems, including ultra-high performance concrete (UHPC)-high-strength steel (HSS) deck, and UHPC-fiber reinforced polymer (FRP) deck, and UHPC-FRP hybrid system, were developed and studied in this research. The UHPC-HSS and UHPC-FRP deck system showed a great potential to serve as viable alternatives. Accordingly, this phase of the project covered all studies needed for their design and implementation. Also, suitability of a UHPC-FRP hybrid bridge deck system as an alternative to open-grid steel decks was evaluated. The study confirmed that the proposed deck with only 4-inch overall depth and a self-weight of 20.88 psf for the deck with HSS reinforcement and 18.79 psf for the deck system with carbon fiber reinforced polymer (CFRP) reinforcement meets the strength requirements for a 4-ft. stringer spacing. Additional work is required to ensure the deck with CFRP reinforcement meets the displacement criteria. The deck is not susceptible to punching shear of its thin slab, and fails in a ductile manner. Load distribution among the ribs, whether calculated based on deflections or strains, is consistent for both types of reinforcement. In order to study the long-term behavior of the proposed decks under the effects of a moving wheel load, additional testing was carried out at the Accelerated Pavement Testing (APT) facility of the Florida Department of Transportation in Gainesville, FL. A hybrid section of UHPC and FRP was considered as another alternative in this research. Based on test results, the main failure mode was at the interface with the top UHPC plate. The hybrid system requires additional improvement.
Amir Mirmiran - One of the best experts on this subject based on the ideXlab platform.
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Lightweight Solid Decks for Movable Bridges – Phase II
2020Co-Authors: Amir Mirmiran, Sahar Ghasemi, Yulin Xiao, Kevin R Mackie, Munaf Al-ramaheeAbstract:Movable Bridges often include open grid steel deck for its light weight and ease of installation. These decks, however, suffer from poor rideability and high maintenance costs. The primary objective of this research project was to search for a new generation of lightweight solid decks that address these issues. Alternative deck systems, including ultra-high performance concrete (UHPC)-high-strength steel (HSS) deck, and UHPC-fiber reinforced polymer (FRP) deck, and UHPC-FRP hybrid system, were developed and studied in this research. The UHPC-HSS and UHPC-FRP deck system showed a great potential to serve as viable alternatives. Accordingly, this phase of the project covered all studies needed for their design and implementation. Also, suitability of a UHPC-FRP hybrid bridge deck system as an alternative to open-grid steel decks was evaluated. The study confirmed that the proposed deck with only 4-inch overall depth and a self-weight of 20.88 psf for the deck with HSS reinforcement and 18.79 psf for the deck system with carbon fiber reinforced polymer (CFRP) reinforcement meets the strength requirements for a 4-ft. stringer spacing. Additional work is required to ensure the deck with CFRP reinforcement meets the displacement criteria. The deck is not susceptible to punching shear of its thin slab, and fails in a ductile manner. Load distribution among the ribs, whether calculated based on deflections or strains, is consistent for both types of reinforcement. In order to study the long-term behavior of the proposed decks under the effects of a moving wheel load, additional testing was carried out at the Accelerated Pavement Testing (APT) facility of the Florida Department of Transportation in Gainesville, FL. A hybrid section of UHPC and FRP was considered as another alternative in this research. Based on test results, the main failure mode was at the interface with the top UHPC plate. The hybrid system requires additional improvement.
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Experimental Evaluation of Aluminum Bridge Deck System
Journal of Bridge Engineering, 2020Co-Authors: Muhammad Saleem, Amir Mirmiran, Kevin R MackieAbstract:Most of the Movable Bridges in the United States have open grid steel decks, primarily because they are factory assembled, lightweight, and easy to install. Open grid steel decks, however, are not as skid resistant as solid decks. Costly maintenance, high noise levels, poor riding comfort, and susceptibility to vibrations are among the other disadvantages of these decks. The objective of the research presented in this paper is to evaluate an alternative lightweight extruded aluminum deck system that has a solid surface and meets the loading requirements as well as weight and thickness limits for Movable bridge decks. These aluminum deck panels with their tongue and groove connections have previously been used in Europe, mainly in Sweden. A detailed experimental evaluation of the aluminum deck system has been carried out, including static and fatigue load testing on the deck panels, as well as ancillary tests on the connections with the girders. On the basis of the in-depth experimental evaluation and the ...
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a super lightweight uhpc hss deck panel for Movable Bridges
Engineering Structures, 2016Co-Authors: Sahar Ghasemi, Pedram Zohrevand, Amir Mirmiran, Yulin Xiao, Kevin R MackieAbstract:Abstract Movable Bridges often include open grid steel deck for its light weight and ease of installation. These decks, however, suffer from poor rideability and high maintenance costs. In search for a new generation of lightweight solid decks that address these issues, a novel system was recently developed using ultra-high performance concrete (UHPC) in the form of a low-profile asymmetric waffle slab reinforced with high-strength steel (HSS) rebars. The deck was shown as a structurally viable alternative, yet its overall weight including haunches and connections exceeded the weight limits for deck replacement on some existing Movable Bridges. The purpose of this study was to optimize the design of proposed UHPC–HSS deck system to meet the weight limits for existing Movable Bridges. The size and reinforcement of the proposed deck were modified in two phases, and five specimens with single or multiple ribs were tested in simple or two-span configurations. Test results have shown that the optimized section with an overall depth of 102 mm and the main longitudinal reinforcement of No. 16 M (16 mm) can suitably meet the load demand, ductility and serviceability requirements, while staying within the weight limits of 1.0 kN/m 2 for a Movable bridge with a stringer spacing of 1.2 m.
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A super lightweight UHPC–HSS deck panel for Movable Bridges
Engineering Structures, 2016Co-Authors: Sahar Ghasemi, Pedram Zohrevand, Amir Mirmiran, Yulin Xiao, Kevin R MackieAbstract:Abstract Movable Bridges often include open grid steel deck for its light weight and ease of installation. These decks, however, suffer from poor rideability and high maintenance costs. In search for a new generation of lightweight solid decks that address these issues, a novel system was recently developed using ultra-high performance concrete (UHPC) in the form of a low-profile asymmetric waffle slab reinforced with high-strength steel (HSS) rebars. The deck was shown as a structurally viable alternative, yet its overall weight including haunches and connections exceeded the weight limits for deck replacement on some existing Movable Bridges. The purpose of this study was to optimize the design of proposed UHPC–HSS deck system to meet the weight limits for existing Movable Bridges. The size and reinforcement of the proposed deck were modified in two phases, and five specimens with single or multiple ribs were tested in simple or two-span configurations. Test results have shown that the optimized section with an overall depth of 102 mm and the main longitudinal reinforcement of No. 16 M (16 mm) can suitably meet the load demand, ductility and serviceability requirements, while staying within the weight limits of 1.0 kN/m 2 for a Movable bridge with a stringer spacing of 1.2 m.
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lightweight solid decks for Movable Bridges phase ii
2016Co-Authors: Amir Mirmiran, Sahar Ghasemi, Yulin Xiao, Kevin R Mackie, Munaf AlramaheeAbstract:Movable Bridges often include open grid steel deck for its light weight and ease of installation. These decks, however, suffer from poor rideability and high maintenance costs. The primary objective of this research project was to search for a new generation of lightweight solid decks that address these issues. Alternative deck systems, including ultra-high performance concrete (UHPC)-high-strength steel (HSS) deck, and UHPC-fiber reinforced polymer (FRP) deck, and UHPC-FRP hybrid system, were developed and studied in this research. The UHPC-HSS and UHPC-FRP deck system showed a great potential to serve as viable alternatives. Accordingly, this phase of the project covered all studies needed for their design and implementation. Also, suitability of a UHPC-FRP hybrid bridge deck system as an alternative to open-grid steel decks was evaluated. The study confirmed that the proposed deck with only 4-inch overall depth and a self-weight of 20.88 psf for the deck with HSS reinforcement and 18.79 psf for the deck system with carbon fiber reinforced polymer (CFRP) reinforcement meets the strength requirements for a 4-ft. stringer spacing. Additional work is required to ensure the deck with CFRP reinforcement meets the displacement criteria. The deck is not susceptible to punching shear of its thin slab, and fails in a ductile manner. Load distribution among the ribs, whether calculated based on deflections or strains, is consistent for both types of reinforcement. In order to study the long-term behavior of the proposed decks under the effects of a moving wheel load, additional testing was carried out at the Accelerated Pavement Testing (APT) facility of the Florida Department of Transportation in Gainesville, FL. A hybrid section of UHPC and FRP was considered as another alternative in this research. Based on test results, the main failure mode was at the interface with the top UHPC plate. The hybrid system requires additional improvement.
Sahar Ghasemi - One of the best experts on this subject based on the ideXlab platform.
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Lightweight Solid Decks for Movable Bridges – Phase II
2020Co-Authors: Amir Mirmiran, Sahar Ghasemi, Yulin Xiao, Kevin R Mackie, Munaf Al-ramaheeAbstract:Movable Bridges often include open grid steel deck for its light weight and ease of installation. These decks, however, suffer from poor rideability and high maintenance costs. The primary objective of this research project was to search for a new generation of lightweight solid decks that address these issues. Alternative deck systems, including ultra-high performance concrete (UHPC)-high-strength steel (HSS) deck, and UHPC-fiber reinforced polymer (FRP) deck, and UHPC-FRP hybrid system, were developed and studied in this research. The UHPC-HSS and UHPC-FRP deck system showed a great potential to serve as viable alternatives. Accordingly, this phase of the project covered all studies needed for their design and implementation. Also, suitability of a UHPC-FRP hybrid bridge deck system as an alternative to open-grid steel decks was evaluated. The study confirmed that the proposed deck with only 4-inch overall depth and a self-weight of 20.88 psf for the deck with HSS reinforcement and 18.79 psf for the deck system with carbon fiber reinforced polymer (CFRP) reinforcement meets the strength requirements for a 4-ft. stringer spacing. Additional work is required to ensure the deck with CFRP reinforcement meets the displacement criteria. The deck is not susceptible to punching shear of its thin slab, and fails in a ductile manner. Load distribution among the ribs, whether calculated based on deflections or strains, is consistent for both types of reinforcement. In order to study the long-term behavior of the proposed decks under the effects of a moving wheel load, additional testing was carried out at the Accelerated Pavement Testing (APT) facility of the Florida Department of Transportation in Gainesville, FL. A hybrid section of UHPC and FRP was considered as another alternative in this research. Based on test results, the main failure mode was at the interface with the top UHPC plate. The hybrid system requires additional improvement.
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a super lightweight uhpc hss deck panel for Movable Bridges
Engineering Structures, 2016Co-Authors: Sahar Ghasemi, Pedram Zohrevand, Amir Mirmiran, Yulin Xiao, Kevin R MackieAbstract:Abstract Movable Bridges often include open grid steel deck for its light weight and ease of installation. These decks, however, suffer from poor rideability and high maintenance costs. In search for a new generation of lightweight solid decks that address these issues, a novel system was recently developed using ultra-high performance concrete (UHPC) in the form of a low-profile asymmetric waffle slab reinforced with high-strength steel (HSS) rebars. The deck was shown as a structurally viable alternative, yet its overall weight including haunches and connections exceeded the weight limits for deck replacement on some existing Movable Bridges. The purpose of this study was to optimize the design of proposed UHPC–HSS deck system to meet the weight limits for existing Movable Bridges. The size and reinforcement of the proposed deck were modified in two phases, and five specimens with single or multiple ribs were tested in simple or two-span configurations. Test results have shown that the optimized section with an overall depth of 102 mm and the main longitudinal reinforcement of No. 16 M (16 mm) can suitably meet the load demand, ductility and serviceability requirements, while staying within the weight limits of 1.0 kN/m 2 for a Movable bridge with a stringer spacing of 1.2 m.
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A super lightweight UHPC–HSS deck panel for Movable Bridges
Engineering Structures, 2016Co-Authors: Sahar Ghasemi, Pedram Zohrevand, Amir Mirmiran, Yulin Xiao, Kevin R MackieAbstract:Abstract Movable Bridges often include open grid steel deck for its light weight and ease of installation. These decks, however, suffer from poor rideability and high maintenance costs. In search for a new generation of lightweight solid decks that address these issues, a novel system was recently developed using ultra-high performance concrete (UHPC) in the form of a low-profile asymmetric waffle slab reinforced with high-strength steel (HSS) rebars. The deck was shown as a structurally viable alternative, yet its overall weight including haunches and connections exceeded the weight limits for deck replacement on some existing Movable Bridges. The purpose of this study was to optimize the design of proposed UHPC–HSS deck system to meet the weight limits for existing Movable Bridges. The size and reinforcement of the proposed deck were modified in two phases, and five specimens with single or multiple ribs were tested in simple or two-span configurations. Test results have shown that the optimized section with an overall depth of 102 mm and the main longitudinal reinforcement of No. 16 M (16 mm) can suitably meet the load demand, ductility and serviceability requirements, while staying within the weight limits of 1.0 kN/m 2 for a Movable bridge with a stringer spacing of 1.2 m.
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lightweight solid decks for Movable Bridges phase ii
2016Co-Authors: Amir Mirmiran, Sahar Ghasemi, Yulin Xiao, Kevin R Mackie, Munaf AlramaheeAbstract:Movable Bridges often include open grid steel deck for its light weight and ease of installation. These decks, however, suffer from poor rideability and high maintenance costs. The primary objective of this research project was to search for a new generation of lightweight solid decks that address these issues. Alternative deck systems, including ultra-high performance concrete (UHPC)-high-strength steel (HSS) deck, and UHPC-fiber reinforced polymer (FRP) deck, and UHPC-FRP hybrid system, were developed and studied in this research. The UHPC-HSS and UHPC-FRP deck system showed a great potential to serve as viable alternatives. Accordingly, this phase of the project covered all studies needed for their design and implementation. Also, suitability of a UHPC-FRP hybrid bridge deck system as an alternative to open-grid steel decks was evaluated. The study confirmed that the proposed deck with only 4-inch overall depth and a self-weight of 20.88 psf for the deck with HSS reinforcement and 18.79 psf for the deck system with carbon fiber reinforced polymer (CFRP) reinforcement meets the strength requirements for a 4-ft. stringer spacing. Additional work is required to ensure the deck with CFRP reinforcement meets the displacement criteria. The deck is not susceptible to punching shear of its thin slab, and fails in a ductile manner. Load distribution among the ribs, whether calculated based on deflections or strains, is consistent for both types of reinforcement. In order to study the long-term behavior of the proposed decks under the effects of a moving wheel load, additional testing was carried out at the Accelerated Pavement Testing (APT) facility of the Florida Department of Transportation in Gainesville, FL. A hybrid section of UHPC and FRP was considered as another alternative in this research. Based on test results, the main failure mode was at the interface with the top UHPC plate. The hybrid system requires additional improvement.
Yulin Xiao - One of the best experts on this subject based on the ideXlab platform.
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Lightweight Solid Decks for Movable Bridges – Phase II
2020Co-Authors: Amir Mirmiran, Sahar Ghasemi, Yulin Xiao, Kevin R Mackie, Munaf Al-ramaheeAbstract:Movable Bridges often include open grid steel deck for its light weight and ease of installation. These decks, however, suffer from poor rideability and high maintenance costs. The primary objective of this research project was to search for a new generation of lightweight solid decks that address these issues. Alternative deck systems, including ultra-high performance concrete (UHPC)-high-strength steel (HSS) deck, and UHPC-fiber reinforced polymer (FRP) deck, and UHPC-FRP hybrid system, were developed and studied in this research. The UHPC-HSS and UHPC-FRP deck system showed a great potential to serve as viable alternatives. Accordingly, this phase of the project covered all studies needed for their design and implementation. Also, suitability of a UHPC-FRP hybrid bridge deck system as an alternative to open-grid steel decks was evaluated. The study confirmed that the proposed deck with only 4-inch overall depth and a self-weight of 20.88 psf for the deck with HSS reinforcement and 18.79 psf for the deck system with carbon fiber reinforced polymer (CFRP) reinforcement meets the strength requirements for a 4-ft. stringer spacing. Additional work is required to ensure the deck with CFRP reinforcement meets the displacement criteria. The deck is not susceptible to punching shear of its thin slab, and fails in a ductile manner. Load distribution among the ribs, whether calculated based on deflections or strains, is consistent for both types of reinforcement. In order to study the long-term behavior of the proposed decks under the effects of a moving wheel load, additional testing was carried out at the Accelerated Pavement Testing (APT) facility of the Florida Department of Transportation in Gainesville, FL. A hybrid section of UHPC and FRP was considered as another alternative in this research. Based on test results, the main failure mode was at the interface with the top UHPC plate. The hybrid system requires additional improvement.
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a super lightweight uhpc hss deck panel for Movable Bridges
Engineering Structures, 2016Co-Authors: Sahar Ghasemi, Pedram Zohrevand, Amir Mirmiran, Yulin Xiao, Kevin R MackieAbstract:Abstract Movable Bridges often include open grid steel deck for its light weight and ease of installation. These decks, however, suffer from poor rideability and high maintenance costs. In search for a new generation of lightweight solid decks that address these issues, a novel system was recently developed using ultra-high performance concrete (UHPC) in the form of a low-profile asymmetric waffle slab reinforced with high-strength steel (HSS) rebars. The deck was shown as a structurally viable alternative, yet its overall weight including haunches and connections exceeded the weight limits for deck replacement on some existing Movable Bridges. The purpose of this study was to optimize the design of proposed UHPC–HSS deck system to meet the weight limits for existing Movable Bridges. The size and reinforcement of the proposed deck were modified in two phases, and five specimens with single or multiple ribs were tested in simple or two-span configurations. Test results have shown that the optimized section with an overall depth of 102 mm and the main longitudinal reinforcement of No. 16 M (16 mm) can suitably meet the load demand, ductility and serviceability requirements, while staying within the weight limits of 1.0 kN/m 2 for a Movable bridge with a stringer spacing of 1.2 m.
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A super lightweight UHPC–HSS deck panel for Movable Bridges
Engineering Structures, 2016Co-Authors: Sahar Ghasemi, Pedram Zohrevand, Amir Mirmiran, Yulin Xiao, Kevin R MackieAbstract:Abstract Movable Bridges often include open grid steel deck for its light weight and ease of installation. These decks, however, suffer from poor rideability and high maintenance costs. In search for a new generation of lightweight solid decks that address these issues, a novel system was recently developed using ultra-high performance concrete (UHPC) in the form of a low-profile asymmetric waffle slab reinforced with high-strength steel (HSS) rebars. The deck was shown as a structurally viable alternative, yet its overall weight including haunches and connections exceeded the weight limits for deck replacement on some existing Movable Bridges. The purpose of this study was to optimize the design of proposed UHPC–HSS deck system to meet the weight limits for existing Movable Bridges. The size and reinforcement of the proposed deck were modified in two phases, and five specimens with single or multiple ribs were tested in simple or two-span configurations. Test results have shown that the optimized section with an overall depth of 102 mm and the main longitudinal reinforcement of No. 16 M (16 mm) can suitably meet the load demand, ductility and serviceability requirements, while staying within the weight limits of 1.0 kN/m 2 for a Movable bridge with a stringer spacing of 1.2 m.
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lightweight solid decks for Movable Bridges phase ii
2016Co-Authors: Amir Mirmiran, Sahar Ghasemi, Yulin Xiao, Kevin R Mackie, Munaf AlramaheeAbstract:Movable Bridges often include open grid steel deck for its light weight and ease of installation. These decks, however, suffer from poor rideability and high maintenance costs. The primary objective of this research project was to search for a new generation of lightweight solid decks that address these issues. Alternative deck systems, including ultra-high performance concrete (UHPC)-high-strength steel (HSS) deck, and UHPC-fiber reinforced polymer (FRP) deck, and UHPC-FRP hybrid system, were developed and studied in this research. The UHPC-HSS and UHPC-FRP deck system showed a great potential to serve as viable alternatives. Accordingly, this phase of the project covered all studies needed for their design and implementation. Also, suitability of a UHPC-FRP hybrid bridge deck system as an alternative to open-grid steel decks was evaluated. The study confirmed that the proposed deck with only 4-inch overall depth and a self-weight of 20.88 psf for the deck with HSS reinforcement and 18.79 psf for the deck system with carbon fiber reinforced polymer (CFRP) reinforcement meets the strength requirements for a 4-ft. stringer spacing. Additional work is required to ensure the deck with CFRP reinforcement meets the displacement criteria. The deck is not susceptible to punching shear of its thin slab, and fails in a ductile manner. Load distribution among the ribs, whether calculated based on deflections or strains, is consistent for both types of reinforcement. In order to study the long-term behavior of the proposed decks under the effects of a moving wheel load, additional testing was carried out at the Accelerated Pavement Testing (APT) facility of the Florida Department of Transportation in Gainesville, FL. A hybrid section of UHPC and FRP was considered as another alternative in this research. Based on test results, the main failure mode was at the interface with the top UHPC plate. The hybrid system requires additional improvement.
Necati F Catbas - One of the best experts on this subject based on the ideXlab platform.
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a machine learning based algorithm for processing massive data collected from the mechanical components of Movable Bridges
Automation in Construction, 2016Co-Authors: Necati F Catbas, Masoud MalekzadehAbstract:This paper presents a machine learning algorithm for processing of massive data collected from the mechanical components of Movable Bridges. The proposed approach consists of training and monitoring phases. The training phase was focused on the extracting statistical features and conducting cross correlation analysis (CCA) and robust regression analysis (RRA). The monitoring phase included tracking of errors associated with the derived models. The main goal was to analyze the efficiency of the developed system for health monitoring of the bridge mechanical components such as gearbox, motor and rack and pinion. To this aim, Sunrise Movable Bridge in Ft. Lauderdale, Florida was selected and instrumented. A comprehensive database was collected from the sensors installed on the mechanical and structural components of the Sunrise Bridge for about 4 years. The collected data were utilized to assess the performance of the algorithm under baseline and different common damage scenarios. Based on the results, the proposed health monitoring system has a satisfactory performance for the detection of the damage scenarios caused by leakage and lack of sufficient oil in gearbox, as well as bolt removal from rack and pinion. The introduced algorithm can be regarded as a valuable tool for the management and interpretation of the massive (big) data collected for structural health monitoring (SHM) of Movable Bridges.
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a machine learning framework for automated functionality monitoring of Movable Bridges
2016Co-Authors: Masoud Malekzadeh, Necati F CatbasAbstract:Functionality of Movable bridge highly depends on the performance of the mechanical components including gearbox and motor. Therefore, on-going maintenance of these components are extremely important for uninterrupted operation of Movable Bridges. Unfortunately, there have been only a few studies on monitoring of mechanical components of Movable Bridges. As a result, in this study, a statistical framework is proposed for continuous maintenance monitoring of the mechanical components. The efficiency of this framework is verified using long-term data that has been collected from both gearbox and motor of a Movable bridge. In the first step, critical features are extracted from massive amount of Structural Health Monitoring (SHM) data. Next, these critical features are analyzed using Moving Principal Component Analysis (MPCA) and a condition-sensitive index is calculated. In order to study the efficiency of this framework, critical maintenance issues have been extracted from the maintenance reports prepared by the maintenance personnel and compared against the calculated condition index. It has been shown that there is a strong correlation between the critical maintenance actions, reported individually by maintenance personnel, and the condition index calculated by proposed framework and SHM data. The framework is tested for the gearbox.
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image based monitoring of open gears of Movable Bridges for condition assessment and maintenance decision making
Journal of Computing in Civil Engineering, 2015Co-Authors: Necati F Catbas, Hiroshi HattoriAbstract:AbstractMovable Bridges are unique structures due to the complex interaction between their structural, mechanical, and electrical systems with an intricate interrelation creating several challenges related to operation and maintenance. Continuous monitoring of the critical parts of these structures is essential to track and evaluate their performance for improving maintenance operations and reducing the associated costs. Open gears are one of the most critical components of Movable Bridges. Proper and regular maintenance of these gears is vitally important to ensure a safe, reliable, and cost-effective operation. In this study, a practical and low-cost monitoring approach is presented to track the lubrication level in an open gear of a Movable bridge by using video cameras. Two unique indices are developed for monitoring of the open gear by investigating two different image processing methods in a comparative fashion. The first methodology is based on an edge detection algorithm that utilizes a Sobel grad...
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critical issues condition assessment and monitoring of heavy Movable structures emphasis on Movable Bridges
Structure and Infrastructure Engineering, 2014Co-Authors: Necati F Catbas, Dan M Frangopol, Burak H Gokce, Ricardo Zaurin, Kirk A GrimmelsmanAbstract:In this paper, a relatively less studied class of structures is presented based on the research conducted on Florida's Movable Bridges over the last several years. Movable Bridges consist of complex structural, mechanical and electrical systems that provide versatility to these Bridges, but at the same time, create intermittent operational and maintenance challenges. Movable Bridges have been designed and constructed for some time; however, there are fewer studies in the literature on Movable Bridges as compared to other bridge types. In addition, none of these studies provide a comprehensive documentation of issues related to the condition of Movable bridge populations in conjunction with possible monitoring applications specific to these Bridges. This paper characterises and documents these issues related to Movable Bridges considering both the mechanical and structural components. Considerations for designing a monitoring system for Movable Bridges are also presented based on inspection reports and expert opinions. The design and implementation of a monitoring system for a representative bascule bridge are presented along with long-term monitoring data. Various Movable bridge characteristics such as opening/closing torque, bridge balance and friction are shown since these are critical for maintenance applications on mechanical components. Finally, the impact of environmental effects (such as wind and temperature) on bridge mechanical characteristics is demonstrated by analysing monitoring data for more than 1000 opening/closing events.
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implementation of structural health monitoring for Movable Bridges
Transportation Research Record, 2012Co-Authors: Hasan Burak Gokce, Necati F CatbasAbstract:This paper discusses how the current practice of bridge inspection and assessment can be complemented with long-term structural health monitoring (SHM) data within a bridge asset management framework. A brief discussion of asset management is presented with data used in current practice and complementary data from SHM. To use any data in a timely and effective manner requires an information management system that considers all constituents, from bridge owners to decision makers to users. Thus a multilayered bridge information system that considers multiple end users and includes a broad range of data sources is presented. After discussion of the proposed system, the paper presents long-term SHM data and inspection and maintenance data from a Movable bridge in Florida. Dynamic data from long-term monitoring were analyzed with time and frequency domain methods as well as statistical methods, which were feasible with large amounts of data. The results of the analysis showed that certain anomalies at critical...