【摘要】 为研究X形弹塑性钢挡块对桥墩横向地震响应影响,以简支梁桥为背景建立有限元模型。采用非线性时程方法分析弹塑性钢挡块屈服强度、桥墩高度、板式橡胶支座临界滑动力对桥墩地震响应影响。研究表明:与横桥向不采用任何约束相比,弹塑性钢挡块可有效减小墩梁间相对位移;与横桥向采用刚度及强度较大混凝土挡块相比,弹塑性钢挡块可有效减小桥墩剪力及弯矩。桥墩地震反应受弹塑性挡块屈服强度、墩高及板式橡胶支座临界滑动力影响较大。更多还原

【Abstract】 To investigate the effect of X-shaped elastic-plastic steel shear keys on transverse seismic responses of pier,the nonlinear finite element model of a simply-supported girder bridge was built. 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. The 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.更多还原