基于拟力法的桥梁结构地震响应分析
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摘要
基于拟力法的基本理论,结合桥梁结构非线性变形特点,提出了桥梁结构非线性分析的一种新方法。计算推导中,考虑了混凝土开裂引起的刚度变化不利影响。与以往变刚度有限元法相比,所提方法具有耗时少,所需存储空间小,效率高,稳定性好等特点。数值算例结果表明,拟力法与有限元法的地震动力响应结果吻合较好,且能确定构件中塑性铰分布及任意位置塑性转角的发展历程,证实了拟力法在连续桥梁结构应用中的准确性和有效性。
In this paper,a new method that combines the force analogy method and the bridge structures deformation characteristics was presented to carry out inelastic dynamic analysis of bridge structures. During computational deduction,the unfavorable influence of stiffness change caused by concrete cracking was considered. Comparing with variable stiffness finite element method,the presented force analogy method has many advantages,such as less computation time and storage spaces,better efficiency and stability. A numerical example shows that the calculation results of both the force analogy method and the finite element method are consistent well,and the former may determine the distribution of plastic hinges of structural members and the development process of plastic rotation angle at any position,therefore it demonstrates the accuracy and efficiency of the force analogy method in the bridge structure.
引文
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