【摘要】：為兼顧纖維模型的精度、效率和數(shù)值穩(wěn)定性,對(duì)纖維模型用于組合構(gòu)件非線性分析時(shí)的建模策略進(jìn)行參數(shù)分析,重點(diǎn)研究了合理單元?jiǎng)澐址绞胶透咝Ы孛骐x散模式。當(dāng)采用一點(diǎn)積分的基于位移的標(biāo)準(zhǔn)有限單元纖維模型時(shí),合理的單元網(wǎng)格尺寸建議選為跨中集中加載簡(jiǎn)支構(gòu)件等效塑性鉸長(zhǎng)度的一半,從而可準(zhǔn)確模擬塑性鉸區(qū)的曲率突變特征,并有效克服應(yīng)變軟化導(dǎo)致的病態(tài)網(wǎng)格依賴問題。當(dāng)采用纖維中點(diǎn)積分準(zhǔn)則以及纖維均勻分布模式時(shí),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(zhǔn)確地模擬組合構(gòu)件在復(fù)雜往復(fù)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(xué)土木工程安全與耐久教育部重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(51378291) “十二五”國(guó)家科技支撐計(jì)劃項(xiàng)目(2011BAJ09B01)
【分類號(hào)】：TU398.9

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本文編號(hào)：2389159