组合构件纤维模型的建模策略——单元划分和截面离散
发布时间：2018-12-21 16:30
【摘要】：为兼顾纤维模型的精度、效率和数值稳定性,对纤维模型用于组合构件非线性分析时的建模策略进行参数分析,重点研究了合理单元划分方式和高效截面离散模式。当采用一点积分的基于位移的标准有限单元纤维模型时,合理的单元网格尺寸建议选为跨中集中加载简支构件等效塑性铰长度的一半,从而可准确模拟塑性铰区的曲率突变特征,并有效克服应变软化导致的病态网格依赖问题。当采用纤维中点积分准则以及纤维均匀分布模式时,分别采用8根、24根、32根纤维离散组合梁、圆形钢管混凝土及矩形钢管混凝土截面,就能足够准确地模拟组合构件在复杂往复荷载作用下的滞回特性。
[Abstract]:In order to give consideration to the accuracy, efficiency and numerical stability of the fiber model, the modeling strategy of the fiber model for nonlinear analysis of composite components is analyzed, and the reasonable unit partition mode and the efficient cross-section discrete mode are studied. When a displacement-based standard finite element fiber model with a point integral is used, a reasonable mesh size is suggested to be chosen as half of the equivalent plastic hinge length of a simply supported member loaded centrally across a span. Thus, the curvature catastrophe characteristics of plastic hinge region can be accurately simulated, and the problem of ill-conditioned mesh dependence caused by strain softening can be effectively overcome. When the fiber midpoint integral criterion and fiber uniform distribution model are adopted, 8, 24, 32 fiber discrete composite beams, circular steel tube concrete and rectangular steel tube concrete section are adopted, respectively. The hysteretic behavior of composite members under complex reciprocating loads can be simulated accurately enough.
【作者单位】： 清华大学土木工程安全与耐久教育部重点实验室;
【基金】：国家自然科学基金项目(51378291) “十二五”国家科技支撑计划项目(2011BAJ09B01)
【分类号】：TU398.9
[Abstract]:In order to give consideration to the accuracy, efficiency and numerical stability of the fiber model, the modeling strategy of the fiber model for nonlinear analysis of composite components is analyzed, and the reasonable unit partition mode and the efficient cross-section discrete mode are studied. When a displacement-based standard finite element fiber model with a point integral is used, a reasonable mesh size is suggested to be chosen as half of the equivalent plastic hinge length of a simply supported member loaded centrally across a span. Thus, the curvature catastrophe characteristics of plastic hinge region can be accurately simulated, and the problem of ill-conditioned mesh dependence caused by strain softening can be effectively overcome. When the fiber midpoint integral criterion and fiber uniform distribution model are adopted, 8, 24, 32 fiber discrete composite beams, circular steel tube concrete and rectangular steel tube concrete section are adopted, respectively. The hysteretic behavior of composite members under complex reciprocating loads can be simulated accurately enough.
【作者单位】： 清华大学土木工程安全与耐久教育部重点实验室;
【基金】：国家自然科学基金项目(51378291) “十二五”国家科技支撑计划项目(2011BAJ09B01)
【分类号】：TU398.9
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