用分层Timoshenko梁单元分析RC斜拉桥的非线性地震响应

Non-linear Earthquake Response Analysis of RC Cable-Stayed Bridges with Layered Timoshenko Beam Element

直接从材料的本构关系出发,用分层的Timoshenko梁单元模拟混凝土的弹塑性性能,对双塔单索面钢筋混凝土斜拉桥进行了考虑几何非线性和材料非线性的地震响应分析,编制了相应的弹塑性分析程序,并与通常弹塑性分析方法的结果进行了比较.结果表明:在设计烈度的地震荷载作用下,大跨RC斜拉桥表现出明显的弹塑性性能,而由缆索的垂度、初张力及结构的大位移等引起的几何非线性影响较小;用分层的Timoshenko梁能较好地模拟在强震作用下钢筋混凝土斜拉桥的弹塑性性能.

The imitating the elastic-plastic behavior of RC with layered Timoshenko beam element, the earthquake response of double-tower single face RC cabled-stayed bridge accounting material and the elastic-plastic analytical program were drawn up. The results were compared with that of general method. The results of research demonstrated： This method can imitate the non-linearity behavior of RC cable-stayed bridge accurately under violent earthquake. The material＇s nonlinear behavior of RC deck and tower under designed intensity is obvious, and the geometrically non-linearity caused by cables＇s, initial tension and large displacement is small.