摘要
提出了一种在非线性时程分析中考虑材料应变率效应的近似方法：首先，对结构进行不考虑应变率效应的非线性时程分析；然后，根据第一次分析的结果可以得到关键位置在与结构最大顶点位移对应的前1/4循环内的平均应变率，根据这些点的平均应变率对进入非线性构件材料的本构关系进行修正；最后，对结构进行第二次分析。文中给出了该方法的力学解释，并通过数值模拟对该方法进行了验证。结论：本文提出的方法具有较高的精度，可以作为一种在非线性时程分析中考虑应变率效应的有效方法。
Abstract
A method considering strain rate effect approximately in nonlinear time-history analysis is proposed in the paper: First, perform nonlinear time-history analysis of the structure without considering strain rate effect. Second, calculate the average strain rates at the important positions in the previous 1/4 cycle corresponding to the maximun top displacement, then the model can be modified according to the average strain rates of the important positions. Finally, perform nonlinear time-history analysis of the structure for the second time. The mechanical explanation of the method is given in the paper. Furthermore, numerical simulation is performed to prove the method. The result shows that the method is precise enough to be an effective method to consider strain rate effect in nonlinear time-history analysis.
关键词
非线性时程分析 /
应变率 /
1/4循环 /
平均应变率
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Key words
nonlinear time-history analysis /
strain rate /
1/4 cycle /
average strain rate
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王文明; 李宏男.
一种考虑应变率效应的结构非线性时程分析方法[J]. 振动与冲击, 2012, 31(11): 137-141
WANG Wen-ming;LI Hong-nan.
A nonlinear time-history analysis method of structures considering strain rate effect[J]. Journal of Vibration and Shock, 2012, 31(11): 137-141
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