独塔钢桁梁单索面斜拉桥地震响应参数分析

Seismic Response Parameter Analysis of Single Cable Plane Cable Stayed Bridge with Single Tower Steel Truss

为研究参数变化对独塔钢桁梁单索面斜拉桥地震响应的影响,以某独塔钢桁梁单索面斜拉桥作为研究背景,使用MIDAS/Civil建立多个不同结构参数的模型,通过非线性时程分析的方法分析了斜拉索刚度变化、钢桁梁刚度变化、结构体系变换对独塔钢桁梁单索面斜拉桥地震响应的影响。结果表明:斜拉索刚度和钢桁梁的刚度增大可以减小独塔钢桁梁单索面斜拉桥桥塔地震作用下的位移;斜拉索刚度变化独塔钢桁梁单索面斜拉桥地震作用下的内力影响较小,但钢桁梁刚度变化对桥梁地震作用下内力的影响机理较为复杂,需要进一步研究;漂浮体系在地震作用下的位移大于其他3种体系,但地震作用下的内力明显小于其余3种体系。

In order to study the influence of parameter change on the seismic response of single tower steel truss single cable plane cable-stayed bridge,and to study the influence of parameter change on the seismic response of single tower steel truss single cable plane cable-stayed bridge,taking a single tower steel truss single cable plane cable-stayed bridge as the research background,using Midas/civil to establish multiple models with different structural parameters.Based on the nonlinear time-history analysis method,the influence of cable stiffness changes,steel truss girder stiffness changes and structural system transformations on seismic response of single tower steel truss girder single cable plane cable-stayed bridge is analyzed.The results show that the increase of cable stiffness and steel truss beam stiffness can optimize the tower displacement of single tower steel truss girder single cable plane cable-stayed bridge under earthquake action;the change of cable stiffness has little influence on the internal force of single tower steel truss girder single cable plane cable-stayed bridge under earthquake,but the influence of steel truss beam stiffness change on the internal force of bridge under earthquake is more complex,which needs further study;the displacement of the floating system under earthquake action is larger than that of the other three systems,but its internal forceunder earthquake action is obviously smaller than the other three systems.