【摘要】：為兼顧纖維模型的精度、效率和數(shù)值穩(wěn)定性,對纖維模型用于組合構件非線性分析時的建模策略進行參數(shù)分析,重點研究了合理單元劃分方式和高效截面離散模式。當采用一點積分的基于位移的標準有限單元纖維模型時,合理的單元網(wǎng)格尺寸建議選為跨中集中加載簡支構件等效塑性鉸長度的一半,從而可準確模擬塑性鉸區(qū)的曲率突變特征,并有效克服應變軟化導致的病態(tài)網(wǎng)格依賴問題。當采用纖維中點積分準則以及纖維均勻分布模式時,分別采用8根、24根、32根纖維離散組合梁、圓形鋼管混凝土及矩形鋼管混凝土截面,就能足夠準確地模擬組合構件在復雜往復荷載作用下的滯回特性。
[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.
【作者單位】： 清華大學土木工程安全與耐久教育部重點實驗室;
【基金】：國家自然科學基金項目(51378291) “十二五”國家科技支撐計劃項目(2011BAJ09B01)
【分類號】：TU398.9

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