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通过大型通用有限元程序MSC.MARC(2005r2)二次开发将纤维截面模型和基于位移的无滑移分布塑性铰梁单元相结合,得到了一种用于钢-混凝土组合结构地震反应分析的纤维梁单元。该单元在兼顾模型的准确性、通用性以及高效性的同时,具有较优的求解效率、数值稳定性以及前后处理速度。根据工程中常用组合截面的特点提出了组合截面的定义方式及其纤维离散过程,并给出了截面本构关系的求解流程。分析了混凝土、钢材以及钢筋三种材料的单轴本构关系,混凝土材料模型能反映普通、高强以及约束混凝土的不同力学特性,并在已有的考虑单次加卸载强度退化模型的基础上发展了能够考虑多次加卸载强度退化行为的混凝土滞回准则,从而使模型更符合地震作用下组合构件中混凝土材料的实际复杂非线性行为,钢材和钢筋模型能较合理地考虑往复荷载作用下的包兴格效应。
Through the large-scale common finite element program MSC.MARC (2005r2), the secondary development of the fiber cross-section model and displacement-based non-slip plastic hinge unit combined to obtain a seismic response analysis of steel-concrete composite structure of the fiber Beam unit. The unit has better solution efficiency, numerical stability and speed before and after taking into account the accuracy, versatility and efficiency of the model. According to the characteristics of the commonly used combined sections in engineering, the method of defining the composite section and the fiber dispersion process are proposed, and the flow of solving the constitutive relationship of the section is given. The uniaxial constitutive relations of concrete, steel and steel are analyzed. The concrete material model can reflect the different mechanical properties of ordinary, high-strength and confined concrete. Based on the existing degeneration model of single-load-unload strength, So that the model can be more in line with the actual complex nonlinear behavior of the concrete material in the composite member under earthquake action. The steel and steel reinforcement model can reasonably consider the effect of the cyclic loading under the reciprocating load Baoxing grid effect.