波形钢腹板高墩大跨径连续刚构桥动力特性及地震反应谱分析

为研究波形钢腹板曲线连续刚构桥动力特性和抗震性能，利用 MIDAS Civil 建立不同腹板曲线连续刚构桥计算模型，再分别改变桩基边界约束和激励角度，对比分析其自振特性和抗震性能变化规律。计算结果表明:考虑桩土效应时，结构柔度更大，自振周期更长；桩基固结时，波形钢腹板刚构桥竖向刚度减弱，而横向刚度有所增加；桩基约束对波形钢腹板刚构桥振型影响更明显，混凝土桥梁在不同约束时振型变化趋势较为一致；随着地震激励角度变化，控制截面内力均先减小后增大，横桥向则相反，而墩顶和跨中位移相差不大，对比控制截面内力及位移可见，波形钢腹板曲线刚构桥抗震性能更好。

Dynamic Characteristics and Seismic Response Spectrum Analysis of High Pier and Long Span Continuous Rigid Frame Bridges with Corrugated Steel Webs

In order to study the self-vibration characteristics and seismic performance of curved continuous rigid frame bridge with corrugated steel webs, the calculation models of curved continuous rigid frame bridge with different webs were established by using MIDAS Civil. And the boundary condition and the excitation angle of earthquake were changed respectively. The results show that the bridge is more flexible and the natural vibration period is longer when considering the effect of pile-soil. When the foundation is consolidated, the vertical stiffness of curved rigid frame bridge with corrugated steel webs is decreased, while the lateral stiffness is increased. Under different constraint conditions, the vibration mode of concrete bridges is consistent, so the influence of boundary condition on the curved frame bridge with corrugated steel webs is obvious. With the change of the seismic excitation angle, the value of bending moment and shearing force of controlled section along the bridge decrease firstly and then increase, while in transverse direction is opposite. The values of moment and shearing force in transverse bridge reach the maximum when the excitation angle is 90 degrees. It is concluded that the seismic performance of curved rigid frame bridge with corrugated steel webs is good.