Shake-table tests and numerical simulation of an innovative isolation system for highway bridges |
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| Institution: | 1. State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China;2. Shanghai Municipal Engineering Design Institute, Shanghai 200092, China;1. Department of Civil Engineering, Ningbo University, Ningbo, 315211, PR China;2. State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai, 200092, PR China;1. School of Civil Engineering, Central South University, Changsha, China;2. National Engineering Laboratory for Construction Technology of High Speed Rail, Changsha, China;3. School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan, China;1. State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China;2. Chi Consulting Engineers, Summit, NJ 07901, USA;1. School of Civil and Environmental Engineering, Ningbo University, Ningbo 315211, PR China;2. State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, PR China;1. Department of Construction, Università IUAV di Venezia, Dorsoduro 2206, Venice 30123, Italy;2. College of Civil Engineering, Fuzhou University, Fuzhou, Fujian 350108, China;3. Sustainable and Innovative Bridges Engineering Research Center, Fuzhou 350108, China |
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| Abstract: | Damage investigation of small to medium-span highway bridges in Wenchuan earthquake revealed that typical damage of these bridges included: sliding between laminated-rubber bearings and bridge girders, concrete shear keys failure, excessive girder displacements and even span collapse. However, the bearing sliding could actually act as a seismic isolation for piers, and hence, damage to piers for these bridges was minor during the earthquake. Based on this concept, an innovative solation system for highway bridges with laminated-rubber bearings is developed. The system is comprised of typical laminated-rubber bearings and steel dampers. Bearing sliding is allowed during an earthquake to limit the seismic forces transmitting to piers, and steel dampers are applied to restrict the bearing displacements through hysteretic energy dissipation. As a major part of this research, a quarter-scale, two-span bridge model was constructed and tested on the shake tables to evaluate the performance of this isolation system. The bridge model was subjected to a Northridge and an artificial ground motion in transverse direction. Moreover, numerical analyses were conducted to investigate the seismic performance of the bridge model. Besides the test bridge model, a benchmark model with the superstructure fixed to the substructure in transverse direction was also included in the numerical analyses. Both the experimental and the numerical results showed high effectiveness of this proposed isolation system in the bridge model. The system was found to effectively control the pier-girder relative displacements, and simultaneously, protect the piers from severe damage. Numerical analyses also validated that the existing finite element methods are adequate to estimate the seismic response of bridges with this isolation system. |
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| Keywords: | Wenchuan earthquake Innovative isolation system Laminated-rubber bearing X-Shaped steel damper Shake-table tests Two-span bridge model |
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