桥梁的多点激振效应和非线性作用

Nonlinear Response Analysis of Bridges under Multi-support Excitation

推导了考虑大应变大位移的几何非线性有限元列式。通过影响矩阵讨论桥梁在多点激振下的非线性地震响应 ,并用算例比较一致输入和多点激振下的线性和非线性响应 ,讨论地震动输入方式和结构参数对地震响应的影响。由分析结果可知非线性和多点激振对结构响应影响较大 。

The geometric nonlinear finite element formulation is derived,including large strain and large displacement.By using the effect matrix,the nonlinear earthquake response of bridges under multi-support excitation is discussed in this paper.Furthermore,the numerical test is given under four cases,linear and nonlinear respondences under consistent or multi-support excitations.The effect of input form of earthquake and parameters of structures on the the respondence are discussed.It can be concluded that the effect of nonlinear and multi-support excitation is significant and the respondence of the bridge under multi-support excitation can be changed greatly with different structural forms and dimensions.