基于纤维模型有限元柔度法的L形钢管混凝土构件非线性仿真分析  

Nonlinear Behavior Simulation of the L-shaped Concrete-Filled Steel Tube Stubs Based on the Fiber Model Flexibility Finite Element

作　　者：林震宇[1] 沈祖炎[1] 罗金辉[1] 张继承[1] 李元齐[1] 

机构地区：[1]同济大学土木工程学院,上海200092

出　　处：《建筑钢结构进展》2010年第4期11-16,共6页Progress in Steel Building Structures

基　　金：上海市重点学科计划(0210121002)

摘　　要：本文基于纤维模型有限元的基本原理,比较了基于刚度法和柔度法建立纤维模型梁单元矩阵的方法和特性。基于柔度法的纤维模型单元的特性是以单元的截面力形函数为基础,在整个计算的过程中,单元各截面内外力严格满足力的平衡条件,不受单元材料非线性状态水平的影响。在合适的纤维材料应力-应变本构关系的基础上,从构件单元层面的角度,推导建立了考虑材料非线性和几何非线性效应的L形钢管混凝土柱数值模型,对L形钢管混凝土轴压、压弯和滞回试验算例分别进行了仿真模拟,试验算例结果与数值结果吻合良好,从而验证了该数值方法的可行性和准确性。Based on the principle of the fiber model finite element, the flexibility-based and stiffness-based models are compared, flexibility-based fiber model elements are based on force interpolation function, so that the the section forces and the section resisting forces can strictly keep balance during the whole analysis process, not influenced by the material nonlinearity. Base on the proper constitution model, the calculating model was established in the level of member element, which considering the nonlinear geometric effects and the nonlinear material effects. Meanwhile the experiments examples are simulated. The result obtained by the calculation is in good agreement with that obtained by experiments. Therefore it verifies the feasibility and correctness of this numerical model.

关 键 词：L形钢管混凝土柱 非线性 纤维模型 有限元柔度法 

分 类 号：TU398[建筑科学—结构工程] TU311.41