大跨度波形钢腹板桥梁在地震激励作用下的动力特性

Dynamic Characteristics of Long-span Corrugated Steel Webs Bridge under Seismic Excitation

以实际工程中某波形钢腹板连续钢构桥作为研究对象,利用有限元软件MidasCivil建立了该桥的计算模型,基于反应谱方法分析了该桥在E1和E2两种地震激励下各控制截面的内力和位移响应,得出以下结论:该桥横向及竖向刚度相对较低,E2反应谱作用下的内力响应强于E1;在反应谱激励下,该桥承受的力为剪力,承受的力矩为扭矩和弯矩;最大内力分布在跨中和桥墩支点附近,在跨中附近竖向出现最大位移响应。

A continuous steel-frame bridge with corrugated steel webs was taken as the research object.The calculation model of the bridge was established by using the finite element software Midas Civil.Based on response spectrum method, the internal force and displacement responses of each control section of the bridge under seismic excitation of E1 and E2 were analyzed.The following conclusions were obtained: the lateral and vertical stiffness of the bridge were relatively low, the internal force response under E2 response spectrum was stronger than that of E1;under the excitation of response spectrum, the force of the bridge was shear, and the moment of the bridge was torsion and bending moment;the maximum internal force was distributed near the midspan and pier fulcrum, and there was a maximum vertical displacement response near the midspan.