大跨RC斜拉桥的非线性地震响应分析

预先确定斜拉桥的弹塑性区域,把包含多微段平面变刚度梁单元推广应用于大跨度斜拉桥的非线性地震响应分析,用微段的刚度变化模拟钢筋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Huges单元分析结果进行了比较。结果表明:该法能较好地模拟在强震作用下钢筋混凝土斜拉桥的非线性性能,可以在大跨斜拉桥的非线性地震响应分析中应用。

Non-linear Earthquake Response Analysis of Long Span RC Cable-stayed Bridges

Assuming the elastic-plastic zone in advance, the plane multi-segment beam elements with variable rigidity are extended to non-linear earthquake response analysis of long span RC cable-stayed bridges. Simulating the elastic-plastic behavior of reinforced concrete with rigidity changes of segments,the nonlinear earthquake responses of the double -tower single face RC cable-stayed bridge are analyzed, taking into account the geometric and material non-linearity. The corresponding elastic-plastic program has been developed. Comparing the results with those of Huges elements, it is demonstrated that the proposed method can well simulate the non-linear behavior of the RC cable-stayed bridge under the action of violent earthquake, so it can be adopted in the non-linear earthquake response analysis of long span cable-stayed bridges.