薄壁高墩大跨连续刚构桥墩抗震性能的分析

建立一座5跨薄壁高墩连续刚构桥的空间抗震有限元模型,考虑群桩效应和桩-土效应,运用时程分析法计算了一致激励及行波效应下高墩的地震响应。结果表明,纵向线刚度大的墩将分担较大的纵向内力,质量大的墩将分担较大的横向内力,行波效应比一致激励下的地震内力大,桩-土效应使高墩变截面处的地震内力增大。

Seismic Analysis of Long Span Continuous Rigid-Frame Bridge with Thin-Walled High Piers

A finite element model of a five-span continuous rigid-frame bridge with thin-walled high piers is set up.The time-history method is used for calculating the seismic response of high piers under uniform excitation and progressive wave effect in consideration of pile group effect and pile-soil interaction.The results show that the piers with larger longitudinal line stiffness will be assigned with larger longitudinal seismic responses,while piers with larger mass will take on larger transverse seismic forces.The seismic response produced by progressive wave effect is larger than that produced by uniform excitation.The seismic forces of piers in the changing section will be enlarged by pile-soil interaction.