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首页> 外文会议>Conference on Connections Between Steel and Concrete Vol.2 Sep 10-12, 2001 Stuttgart, Germany >NON-LINEAR ANALYSIS OF STEEL-CONCRETE COMPOSITE BEAMS: A FINITE ELEMENT MODEL
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NON-LINEAR ANALYSIS OF STEEL-CONCRETE COMPOSITE BEAMS: A FINITE ELEMENT MODEL

机译：钢-混凝土组合梁的非线性分析：有限元模型

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摘要

In the scientific literature several models devoted to non-linear analysis of steel-concrete composite beams are already available. Utilising finite element models generally based on classical displacement approach, some problems may occur, as relevant discontinuities in the nodal forces, especially when non-linear behaviour of both shear connection and structural materials are considered. In this case the necessity of very fine discretization of the structural members arises. In the present paper a different non-linear procedure is proposed, based on a finite element model derived by the extension of the "exact" solution of the Newmark's model to the composite beam with mechanical characteristics variable along the axis. A "modified Newton-Raphson approach" is used to achieve the convergence considering also the non-linearity of shear connection, concrete and steel. Some comparisons with other numerical procedures and experimental results, both available in the scientific literature, are also proposed and, finally, a brief discussion on the solution convergence varying the number and the types of beam-element subdivision is reported, in order to point out the effectiveness of the proposed procedure.
机译：在科学文献中，已经有几种专门用于钢-混凝土组合梁非线性分析的模型。通常使用基于经典位移方法的有限元模型，可能会出现一些问题，因为节点力的相关不连续性，尤其是在考虑剪力连接和结构材料的非线性行为时。在这种情况下，就需要使结构构件非常细化。在本文中，基于有限元模型，提出了一种不同的非线性程序，该有限元模型是通过将Newmark模型的“精确”解扩展到机械特性沿轴变化的组合梁而得出的。考虑到剪切连接，混凝土和钢的非线性，使用“改进的牛顿-拉夫森方法”来实现收敛。还提出了与其他数值程序和实验结果的比较，这些数值方法和实验结果都可以在科学文献中找到，最后，简要讨论了改变收敛性，改变束元细分的数量和类型的方法，以指出拟议程序的有效性。

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