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简要总结了基于拟力法的动力非线性分析方法的研究进展,介绍了非线性振型叠加法中由于材料非线性导致的结构运动方程耦合的解耦过程。并以一个六层钢框架为算例进行了动力非线性响应分析,结果表明,非线性振型叠加法与有限元法的非线性动力响应结果吻合很好,证实了非线性振型叠加法在钢框架结构非线性动力分析中的准确性与有效性。
This paper briefly summarizes the research progress of dynamic nonlinear analysis method based on quasi-force method, and introduces the decoupling process of structural motion equation coupling caused by material nonlinearity in nonlinear modal superposition method. A six-story steel frame is taken as an example to analyze the dynamic nonlinear response. The results show that the nonlinear vibration mode superposition method is in good agreement with the nonlinear dynamic response of the finite element method. It is proved that the superposition of nonlinear mode shapes Accuracy and Effectiveness of Nonlinear Dynamic Analysis of Steel Frame Structures.