Highway bridge unseating and reduction analysis using SMA restrainers under earthquake excitations

Anxin Guo; Qingjie Zhao; Hui Li

doi:10.1117/12.843473

20 October 2009 Highway bridge unseating and reduction analysis using SMA restrainers under earthquake excitations

Anxin Guo, Qingjie Zhao, Hui Li

Proceedings Volume 7493, Second International Conference on Smart Materials and Nanotechnology in Engineering; 74931F (2009) https://doi.org/10.1117/12.843473
Event: Second International Conference on Smart Materials and Nanotechnology in Engineering, 2009, Weihai, China

Abstract

During the past several strong earthquakes, most of the highway bridge suffered from unseating and pounding damage due to large displacement between the adjacent frames. One traditional approach for mitigating the unseating of the highway bridge is to use restrainers made of steel cables and rods. However, the elastic design demands of the restrainers will induce large additional forces on the structural components of the bridges. The aim of the study is to investigate the effects of the strong ground motions on the unseating and pounding damages of the base-isolated highway bridges, and the performance of the shape memory alloy (SMA) restrainers for the unseating reduction of the highway bridge. An analytical model of the highway bridge with SMA restrainers and pounding effects is established, and the performance of the SMA restrainer for eliminating the bridge unseating and pounding of the highway bridge is also analyzed. Numerical simulation results indicate that the pounding strongly increase the structural responses and the SMA restrainer can be effectively used to mitigate the bridge unseating and pounding damage when subjected to the strong ground motions.

Citation Download Citation

Anxin Guo, Qingjie Zhao, and Hui Li "Highway bridge unseating and reduction analysis using SMA restrainers under earthquake excitations", Proc. SPIE 7493, Second International Conference on Smart Materials and Nanotechnology in Engineering, 74931F (20 October 2009); https://doi.org/10.1117/12.843473

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