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首页> 外文会议>Conference on connections between steel and concrete >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：钢混凝土复合梁的非线性分析：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，若干致力于钢混凝土复合梁的非线性分析的型号已经获得。利用有限元模型通常基于经典位移方法，可能发生一些问题，作为节点力中的相关不连续性，特别是当考虑剪切连接和结构材料的非线性行为时。在这种情况下，必须出现结构构件非常精细地离散化的必要性。在本文中，提出了一种不同的非线性过程，基于由沿着沿轴的机械特性变量的机械特性变量的“精确”的“精确”解码的“精确”解码来源的有限元模型。考虑到剪切连接，混凝土和钢的非线性也用于实现“改进的牛顿 - 拉赛方法”来实现收敛。还提出了与科学文献中可用的其他数值程序和实验结果的一些比较，最后，报告了对溶液会聚的简要讨论，报告了不同数量和梁元细分的类型，以指出拟议程序的有效性。

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