The Experts below are selected from a list of 17763 Experts worldwide ranked by ideXlab platform
Huang Huang - One of the best experts on this subject based on the ideXlab platform.
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Monitoring and Structural analysis of a rehabilitated box girder bridge based on long-gauge strain sensors
Structural Health Monitoring-an International Journal, 2017Co-Authors: Huang HuangAbstract:Structural Rehabilitation is playing an increasingly important role in civil engineering owing to issues with aging infrastructure. In this context, a feasible inspection and monitoring system is needed to draw up effective Structural Rehabilitation projects. This article presents a case study of a real box girder bridge strengthened via external post-tensioning. With the aim of evaluating the strengthening project and the Structural behavior changes, a large-scale strain sensing system containing four sensing areas was installed on the bridge before strengthening, and the static and dynamic strain distribution changes were recorded during annual inspections. The text focuses on discussing and comparing the variations of strain distribution across the bridge before and after strengthening, as well as the yearly changes the rehabilitated bridge has undergone. From the measured strain responses, we accurately determined that the rehabilitated bridge had undergone an unexpected reduction in its flexural stif...
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Monitoring and Structural analysis of a rehabilitated box girder bridge based on long-gauge strain sensors
Structural Health Monitoring, 2017Co-Authors: Huang HuangAbstract:Structural Rehabilitation is playing an increasingly important role in civil engineering owing to issues with aging infrastructure. In this context, a feasible inspection and monitoring system is needed to draw up effective Structural Rehabilitation projects. This article presents a case study of a real box girder bridge strengthened via external post-tensioning. With the aim of evaluating the strengthening project and the Structural behavior changes, a large-scale strain sensing system containing four sensing areas was installed on the bridge before strengthening, and the static and dynamic strain distribution changes were recorded during annual inspections. The text focuses on discussing and comparing the variations of strain distribution across the bridge before and after strengthening, as well as the yearly changes the rehabilitated bridge has undergone. From the measured strain responses, we accurately determined that the rehabilitated bridge had undergone an unexpected reduction in its flexural stiffness as well as a torsion action. Moreover, finite element analysis results of three different damage models are discussed to understand the detailed cause for this.
Amir Fam - One of the best experts on this subject based on the ideXlab platform.
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Fatigue Performance of Furfuryl Alcohol Resin Fiber-Reinforced Polymer for Structural Rehabilitation
Journal of Composites for Construction, 2020Co-Authors: Kenneth Mak, Amir FamAbstract:Abstract One promising polymer replacement to conventional petroleum-derived resins in fiber-reinforced polymers (FRPs) is furfuryl alcohol (FA) resin, which is a thermosetting resin derived from a...
Michelangelo Micheloni - One of the best experts on this subject based on the ideXlab platform.
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Structural Rehabilitation AND REAL TIME MONITORING OF THE “PONTE DELLE GRAZIE” BRIDGE IN FAENZA, ITALY
ISPRS - International Archives of the Photogrammetry Remote Sensing and Spatial Information Sciences, 2019Co-Authors: G. Corsi, Michelangelo Micheloni, M La Monica, F. Frediani, M. Lapi, Lapo Miccinesi, Massimiliano PieracciniAbstract:Abstract. The “Ponte delle Grazie” is a three spans bridge, with a total length of 72 meters, built between 1948 and 1952 in Faenza, Italy. The reinforced concrete main beams of the deck have undergone a strong deterioration over the years. In detail atmospheric agents and chemical aggressions caused a strong deterioration of the concrete, up to the point of making the structure not accessible and at risk of collapse. In fact, the five main beams were heavily damaged, as well as the concrete bearings were strongly compromised. So, an urgent intervention was necessary to save the structure of this historic bridge. A delicate restoration has allowed to remove the deteriorated concrete and to restore the resistant sections with new materials compatible with the old remaining structures. In particular, a specific Rehabilitation procedure was studied using fiber-reinforced cement mortar with low elastic modulus, that is shrinkage compensated, in combination with composite materials reinforcements. Without modifying the Structural behavior of the bridge, the deteriorated concrete was restored and reinforced, in a sustainable way, in order to make the structure safe and usable again. After the restoration and reinforcement the bridge capacity satisfy a reduced live load useful for urban traffic. After the restoration and reinforcement the bridge capacity satisfy a reduced live load useful for urban traffic. Even if the structure has returned to be suitable for vehicular traffic, it has been necessary to set up a real-time monitoring system, which monitors the live load and the behavior of the bridge. In detail it is used a system of geophones, that are able to detect the displacement of structures by integrating in time their response. They can provide continuous health monitoring of the bridge by transmitting the data to a remote server.
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Sustainable Structural Rehabilitation and strengthening of the “Ponte delle Grazie” bridge in Faenza, Italy
IOP Conference Series: Materials Science and Engineering, 2018Co-Authors: Michelangelo Micheloni, M La Monica, D Parmeggiani, P BarchiAbstract:The "Ponte delle Grazie" is a three span bridge, with a total length of 72 meters, built between 1948 and 1952 in Faenza, Italy. The reinforced concrete main beams of the deck have undergone a strong deterioration over the years. In detail atmospheric agents and chemical aggressions caused a strong deterioration of the concrete, up to the point of making the structure not accessible and at risk of collapse. In fact, the five main beams were heavily damaged, as well as the concrete bearings were strongly compromised. So, an urgent intervention was necessary to save the structure of this historic bridge. A delicate restoration has allowed to remove the deteriorated concrete and to restore the resistant sections with new materials compatible with the old remaining structures. In particular, a specific Rehabilitation procedure was studied using fiber-reinforced cement mortar with low elastic modulus, that is shrinkage compensated, in combination with composite materials reinforcements. Without modifying the Structural behaviour of the bridge, the deteriorated concrete was restored and reinforced, in a sustainable way, in order to make the structure safe and usable again.
P Barchi - One of the best experts on this subject based on the ideXlab platform.
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Sustainable Structural Rehabilitation and strengthening of the “Ponte delle Grazie” bridge in Faenza, Italy
IOP Conference Series: Materials Science and Engineering, 2018Co-Authors: Michelangelo Micheloni, M La Monica, D Parmeggiani, P BarchiAbstract:The "Ponte delle Grazie" is a three span bridge, with a total length of 72 meters, built between 1948 and 1952 in Faenza, Italy. The reinforced concrete main beams of the deck have undergone a strong deterioration over the years. In detail atmospheric agents and chemical aggressions caused a strong deterioration of the concrete, up to the point of making the structure not accessible and at risk of collapse. In fact, the five main beams were heavily damaged, as well as the concrete bearings were strongly compromised. So, an urgent intervention was necessary to save the structure of this historic bridge. A delicate restoration has allowed to remove the deteriorated concrete and to restore the resistant sections with new materials compatible with the old remaining structures. In particular, a specific Rehabilitation procedure was studied using fiber-reinforced cement mortar with low elastic modulus, that is shrinkage compensated, in combination with composite materials reinforcements. Without modifying the Structural behaviour of the bridge, the deteriorated concrete was restored and reinforced, in a sustainable way, in order to make the structure safe and usable again.
George Mcalpine - One of the best experts on this subject based on the ideXlab platform.
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Structural Rehabilitation of Semi Elliptical Concrete Sewers
Pipelines 2006, 2006Co-Authors: George McalpineAbstract:This paper discusses the design for Structural Rehabilitation of man-entry size cast-in-place semi elliptical concrete sewers. Many such sewers were built in the early 1900’s and are still in service, notably in Chicago, Los Angeles and Seattle. Even though some were lined with clay tiles even these are now in need of repair due to severe hydrogen sulfide induced corrosion above normal flow lines of these concrete structures. As these structures were design as arches, the principal load is compression in the wall section and no reinforcing steel is required. The inverts of these sewers are most always very flat (very large radius of curvature). This paper discusses design approaches that address the repair of the plain concrete structure to restore (or increase) its wall section properties, i.e., load capacity. The Rehabilitation materials considered are strain compatible with and bond to the concrete structure walls. Thus, composite material design is appropriate using classical transform-section analysis. Also discussed is the often-overlooked (ignored) process of determining the current state of stress of the structure before Rehabilitation. This consideration is shown to be important in Rehabilitation design and points out the need to accurately determine (as possible and practical) the actual total load on the structure. A design example from a past project is given.
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Structural Rehabilitation of Cast-In-Place Concrete Sewers
Pipelines 2005, 2005Co-Authors: George Mcalpine, Bennett AndersonAbstract:This paper discusses the design and installation of a Grouted-In-Place PVC liner (GIPL) in a large diameter cast-in-place concrete pipe (CIPCP). The Sims Bayou trunk sewer in southeast Houston, Texas consists of several miles of 72” (1.83 m) and 78” (1.98 m) nominally circular concrete structures built about 40-years ago. This paper deals with the Structural Rehabilitation of approximately 1500 feet (457 m) of 72” (1.83 m) and 8500 feet (2,591 m) of 78” (1.98 m) of this sewer that has deteriorated due to hydrogen sulfide induced corrosion of the inner surfaces of the pipe walls. The design of the GIPL follows classical engineering mechanics for composite reinforced concrete structures. Design examples are given for various levels of deterioration of the host structure.
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ovality in pipe Rehabilitation design
Pipeline Infrastructure II, 1993Co-Authors: George McalpineAbstract:Pipes in need of Structural Rehabilitation often have longitudinal cracks (at the crown and elsewhere) and exhibit significant ovality (5-10%). When these pipes are lined with current Rehabilitation methods using cured-in-place liners (CIPP), the liners, of necessity, take on the shape of the host pipe including its ovality. Typically, these liners are low stiffness, flexible pipes which depend on relatively stiff side support from the host pipe and/or soil to provide enhancement of their low inherent buckling strength to produce a Structural Rehabilitation capable of carrying either the anticipated hydrostatic load or the full service load of the host pipe (depending on the condition of the host pipe). This paper examines the equations (ASTM F 1216) used in designing these CIPP and, using Timoshenko's analysis ('Theory of Elastic Stability') of the effects of initial ovality, shows that the modifications made to account for ovality are inappropriate. Further, the theoretical models upon which the ASTM F 1216 equations are based are shown to be inappropriate and inconsistent with their use in this application.
