Effects of X-shaped elastic-plastic steel shear keys on transverse seismic responses of a simply-supported girder bridge

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Journal of Vibration and Shock ›› 2015, Vol. 34 ›› Issue (2) : 143-149.

LIU Xiao-xian，LI Jian-zhong，CHEN Xu

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Abstract

To investigate the effect of X-shaped elastic-plastic steel shear keys on transverse seismic responses of pier, a nonlinear finite element model was built based on a simply-supported girder bridge. Effects of elastic-plastic steel shear key yield strength, pier height, and laminated rubber bearing critical sliding force were analyzed with nonlinear time history method. Results show that in comparison with the case without transverse constraints, elastic-plastic steel shear keys are effective in reducing the relative displacement between pier and girder. Compared to the case with stiff and strong concrete shear keys, elastic-plastic steel shear keys can diminish the shear forces and bending moments of the pier. Seismic responses of pier are heavily influenced by the elastic-plastic steel shear key yield strength, pier height and the critical sliding force of the laminated rubber bearing.

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X-shaped elastic-plastic steel shear key / transverse seismic response / simply-supported girder bridge

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LIU Xiao-xian;LI Jian-zhong;CHEN Xu. Effects of X-shaped elastic-plastic steel shear keys on transverse seismic responses of a simply-supported girder bridge[J]. Journal of Vibration and Shock, 2015, 34(2): 143-149