The Experts below are selected from a list of 147 Experts worldwide ranked by ideXlab platform

Michael Ritzler - One of the best experts on this subject based on the ideXlab platform.

Jerome O'connor - One of the best experts on this subject based on the ideXlab platform.

  • Live Load Distribution of Hybrid Fiber-Reinforced Polymer Composite Superstructure on the Basis of Field Test
    Transportation Research Record, 2012
    Co-Authors: Il-sang Ahn, Young Hoon Park, Stuart S. Chen, Jerome O'connor
    Abstract:

    Transverse live load distribution in a concrete-fiber-reinforced polymer (FRP) Composite hybrid bridge was investigated both experimentally and analytically. The subject bridge was a concrete-FRP Composite hybrid bridge, constructed with four 31-ft (9.4-m) long, prefabricated Superstructure panels, which were joined along longitudinal field joints made of steel-reinforced grout. The live load distribution factors (DFs) of this bridge were evaluated with strain values measured in field tests and produced from finite element analysis. Design documents and load rating reports showed that a simplified method on the basis of beam-bending could be used in the design process, which required live load DFs. From strain values measured during load tests, the DFs were inferred to be 0.35 and 0.49 for interior and exterior panels, respectively. The comparison of load tests done 6 years apart indicated no significant change in the structural performance of the bridge. Although the design of this structure was unique, ...

Zlatko Šavor - One of the best experts on this subject based on the ideXlab platform.

  • Cable vibrations at Dubrovnik bridge
    Bridge Structures, 2006
    Co-Authors: Zlatko Šavor, Jure Radić, Gordana Hrelja
    Abstract:

    The only cable-stayed bridge in Croatia, the Dubrovnik bridge, was opened for traffic in 2002. The main cable-stayed bridge with Composite Superstructure is jointed in span to the prestressed concrete approach bridge by a hinge-type connection. The bridge has experienced vibrations of cable stays under certain wind conditions, as with many other cable-stayed bridges around the world. After a short review of results of wind tunnel tests and various numerical analyses, field observations of cable-stay vibrations are highlighted. Only after extremely violent movements of cable stays and the Superstructure under a heavy, damp snowstorm occurred, resulting in substantial damage, was it decided to apply vibration mitigation measures. Adjustable cable dampers, based on the latest MagnetoRheological (MR) technology, were installed on the bridge to raise low structural damping of the most affected cable stays.

  • Dubrovnik bridge - design, construction and service performance
    2006
    Co-Authors: Zlatko Šavor, Jure Radić, Nijaz Mujkanović, Gordana Hrelja
    Abstract:

    The only cable stayed bridge in Croatia, the Dubrovnik bridge, was opened for traffic in the year 2002. The cable stayed main bridge with Composite Superstructure is jointed in span to the prestressed concrete approach bridge by a hinge type hinge connection. The main and detailed designs were carried out by the team from the Structural Department of Civil Engineering Faculty in Zagreb, based on preliminary design by Prof. Schambeck and Sporschill [1] . Essentials of the Dubrovnik bridge design and construction are presented in the paper. The bridge has experienced vibrations of stay cables under certain wind conditions, as with many other cable-stayed bridges around the world. After a short review of results of wind tunnel tests and various numerical analyses, field observations of rain-wind induced stay cable vibrations are highlighted. Only after extremely violent movements of stay cables and the Superstructure under heavy damp snow storm occured, resulting in substantial damage, was it decided to apply vibration mitigation measures. Adjustable cable dampers, based on MR technology were installed on the bridge to raise low structural damping of mostly affected stay cables. Theoretical computations suggest that the stay cable vibrations shall be strongly reduced. Accelerometers and displacement transducers shall be placed on some stay cables to continuously monitor their motion.

  • Design and construction of Krka bridge near Skradin
    2006
    Co-Authors: Zlatko Šavor, Nijaz Mujkanović, Gordana Hrelja
    Abstract:

    A new concrete arch bridge with 204.0 m span was constructed across the Krka River canyon on the section Skradin-Sibenik of the Adriatic highway. The bridge site lies in an environmentally protected area very close to the Krka national park. The Superstructure is continuous with spans L=3x32.0+3x28.0+3x32.0+28.0+24.0=360.0 m comprising two main steel box-type beams spaced at 7.6 m, strong steel cross beams and a concrete deck plate in Composite action with both main and cross beams. The application of the Composite Superstructure, made possible significant reduction of the dead weight and enhanced the bridge appearance in comparison to other Croatian concrete arch bridges. Because of the importance of the Krka River bridge and aggressive environment monitoring system was installed for measurements of deformations, local temperature values, movements in service at critical points and corrosion rate. The construction of the bridge across the Krka River canyon commenced in the year 2003 and was successfully completed in two years in 2005. The whole arch cross section was constructed by free cantilevering, on traveling formwork carriages, in segments 5.25 meters long, starting symmetrically from arch abutments. Piers at the arch abutments had to be extended by auxiliary steel staying pylons to facilitate successive cantilevering. The arch was supported during construction by stays equilibrated by anchor stays, connected to rock anchors. The steel Superstructure grillage was erected by longitudinal launching in three phases. The concrete deck is formed from full depth precast slabs interconnected by on site concreting of longitudinal and transversal joints above shear connectors.

  • BRIDGE ACROSS RIJEKA DUBROVACKA, CROATIA
    Structural Engineering International, 2003
    Co-Authors: Zlatko Šavor, Jure Radić, Veljko Prpic
    Abstract:

    This paper describes the bridge across Rijeka Dubrovacka in Croatia. The bridge is situated on the western entrance to Dubrovnik, a historical medieval town and well-known tourist destination on the Adriatic coast in Croatia. The existing road passes along the seashore so that increased traffic jeopardizes the environment and harms tourism. The bridge is comprised of a main cable-stayed bridge with prestressed concrete approach bridge and Composite Superstructure.

  • World-Renowned Contemporary Croatian Bridges
    2003
    Co-Authors: Jure Radić, Zlatko Šavor, Goran Puž
    Abstract:

    The paper gives an overview of the most important characteristics of some exceptional new Croatian bridges. The bridge over Rijeka Dubrovacka is unique by its asymmetrical layout and the combination of two structures: concrete beam and cable-stayed structure over the same span. Maslenica and Krka arch bridges belong to the group of very large concrete arches. Both of them have a wide Superstructure supported on a much narrower arch, which makes them quite unique among similar bridges. Their design has been strongly influenced by durability demands, since older bridges near the sea did not perform well. While Maslenica bridge has a Superstructure made of precast prestressed girders interconnected by slab cast in situ, Krka bridge has much lighter Composite Superstructure. Finally, Domovinski bridge in Zagreb is presented as the first extradosed bridge in our country, and one among few in the world.

Jure Radić - One of the best experts on this subject based on the ideXlab platform.

  • Cable vibrations at Dubrovnik bridge
    Bridge Structures, 2006
    Co-Authors: Zlatko Šavor, Jure Radić, Gordana Hrelja
    Abstract:

    The only cable-stayed bridge in Croatia, the Dubrovnik bridge, was opened for traffic in 2002. The main cable-stayed bridge with Composite Superstructure is jointed in span to the prestressed concrete approach bridge by a hinge-type connection. The bridge has experienced vibrations of cable stays under certain wind conditions, as with many other cable-stayed bridges around the world. After a short review of results of wind tunnel tests and various numerical analyses, field observations of cable-stay vibrations are highlighted. Only after extremely violent movements of cable stays and the Superstructure under a heavy, damp snowstorm occurred, resulting in substantial damage, was it decided to apply vibration mitigation measures. Adjustable cable dampers, based on the latest MagnetoRheological (MR) technology, were installed on the bridge to raise low structural damping of the most affected cable stays.

  • Dubrovnik bridge - design, construction and service performance
    2006
    Co-Authors: Zlatko Šavor, Jure Radić, Nijaz Mujkanović, Gordana Hrelja
    Abstract:

    The only cable stayed bridge in Croatia, the Dubrovnik bridge, was opened for traffic in the year 2002. The cable stayed main bridge with Composite Superstructure is jointed in span to the prestressed concrete approach bridge by a hinge type hinge connection. The main and detailed designs were carried out by the team from the Structural Department of Civil Engineering Faculty in Zagreb, based on preliminary design by Prof. Schambeck and Sporschill [1] . Essentials of the Dubrovnik bridge design and construction are presented in the paper. The bridge has experienced vibrations of stay cables under certain wind conditions, as with many other cable-stayed bridges around the world. After a short review of results of wind tunnel tests and various numerical analyses, field observations of rain-wind induced stay cable vibrations are highlighted. Only after extremely violent movements of stay cables and the Superstructure under heavy damp snow storm occured, resulting in substantial damage, was it decided to apply vibration mitigation measures. Adjustable cable dampers, based on MR technology were installed on the bridge to raise low structural damping of mostly affected stay cables. Theoretical computations suggest that the stay cable vibrations shall be strongly reduced. Accelerometers and displacement transducers shall be placed on some stay cables to continuously monitor their motion.

  • BRIDGE ACROSS RIJEKA DUBROVACKA, CROATIA
    Structural Engineering International, 2003
    Co-Authors: Zlatko Šavor, Jure Radić, Veljko Prpic
    Abstract:

    This paper describes the bridge across Rijeka Dubrovacka in Croatia. The bridge is situated on the western entrance to Dubrovnik, a historical medieval town and well-known tourist destination on the Adriatic coast in Croatia. The existing road passes along the seashore so that increased traffic jeopardizes the environment and harms tourism. The bridge is comprised of a main cable-stayed bridge with prestressed concrete approach bridge and Composite Superstructure.

  • World-Renowned Contemporary Croatian Bridges
    2003
    Co-Authors: Jure Radić, Zlatko Šavor, Goran Puž
    Abstract:

    The paper gives an overview of the most important characteristics of some exceptional new Croatian bridges. The bridge over Rijeka Dubrovacka is unique by its asymmetrical layout and the combination of two structures: concrete beam and cable-stayed structure over the same span. Maslenica and Krka arch bridges belong to the group of very large concrete arches. Both of them have a wide Superstructure supported on a much narrower arch, which makes them quite unique among similar bridges. Their design has been strongly influenced by durability demands, since older bridges near the sea did not perform well. While Maslenica bridge has a Superstructure made of precast prestressed girders interconnected by slab cast in situ, Krka bridge has much lighter Composite Superstructure. Finally, Domovinski bridge in Zagreb is presented as the first extradosed bridge in our country, and one among few in the world.

  • Sixth Large Reinforced Concrete Arch on the Adriatic Coast
    2003
    Co-Authors: Jure Radić, Zlatko Šavor, Goran Puž
    Abstract:

    ABSTRACT. Five large reinforced concrete arch bridges have been bui1t so far on the Adriatic coast in Croatia, while the sixth is currently under construction. The performance in service of some arch bridges built between 1968. and 1980 cannot be deemed satisfactory. Structural defects were found at an early age and hence cannot be blamed primarily on the aggressive environment, but are attributed to conceptual design and errors and negligence on site. The Maslenica Highway arch bridge, completed in 1997, was designed taking into the account the severity of the marine environment, and the experience from inspections of other arch bridges. Skradin bridge over the Krka river canyon is curently under construction. The designer offered two a1ternatives. The first one envisioned a conventional prestressed concrete Superstructure made of precast girders and in situ slab, similar to the Maslenica Bridge, while the other, which was adopted, a Composite Superstructure. Further developments of true reinforced concrete arches are discussed with respect to the structural materials, structural system and construction methods.

Il-sang Ahn - One of the best experts on this subject based on the ideXlab platform.

  • Live Load Distribution of Hybrid Fiber-Reinforced Polymer Composite Superstructure on the Basis of Field Test
    Transportation Research Record, 2012
    Co-Authors: Il-sang Ahn, Young Hoon Park, Stuart S. Chen, Jerome O'connor
    Abstract:

    Transverse live load distribution in a concrete-fiber-reinforced polymer (FRP) Composite hybrid bridge was investigated both experimentally and analytically. The subject bridge was a concrete-FRP Composite hybrid bridge, constructed with four 31-ft (9.4-m) long, prefabricated Superstructure panels, which were joined along longitudinal field joints made of steel-reinforced grout. The live load distribution factors (DFs) of this bridge were evaluated with strain values measured in field tests and produced from finite element analysis. Design documents and load rating reports showed that a simplified method on the basis of beam-bending could be used in the design process, which required live load DFs. From strain values measured during load tests, the DFs were inferred to be 0.35 and 0.49 for interior and exterior panels, respectively. The comparison of load tests done 6 years apart indicated no significant change in the structural performance of the bridge. Although the design of this structure was unique, ...