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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。
In order to take into account the accuracy, efficiency and numerical stability of the fiber model, the modelling strategy of the fiber model for the nonlinear analysis of composite components is analyzed, and the rational element partitioning method and the high-efficiency cross-section discrete model are mainly studied. When using a point-integrated displacement-based standard finite element fiber model, a reasonable cell mesh size is recommended to be half of the equivalent plastic hinge length of a simply-supported member loaded centrally and centrally, so that the curvature of the plastic hinge region can be accurately simulated. , And effectively overcome the strain grid softening caused by the problem of dependent grid. When using fiber midpoint integration criteria and fiber uniform distribution patterns, using eight, 24, 32 fiber discrete composite beams, circular steel tube concrete and rectangular steel tube concrete sections, respectively, can accurately simulate the complex components in a complex reciprocating Hysteresis characteristics under load.