雙槽鋼組合截面懸臂構(gòu)件在往復彎曲下滯回性能研究*
冉紅東，梁文龍
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（西安建筑科技大學土木工程學院， 西安 710055）
［摘要］為研究雙槽鋼組合截面懸臂構(gòu)件的滯回性能，建立了8個雙槽鋼組合截面懸臂構(gòu)件在往復彎曲作用下的有限元模型。通過改變填板間距、側(cè)向支撐間距、腹板高厚比和設(shè)置加勁肋等參數(shù)，得到不同參數(shù)下模型的滯回曲線、骨架曲線、各階段的彎矩和轉(zhuǎn)角值及抗震性能指標，分析了模型的破壞特征、延性、耗能能力、承載能力及剛度退化等力學性能。結(jié)果表明：雙槽鋼組合截面懸臂構(gòu)件有良好的滯回性能；填板間距的減小，可以有效防止單肢槽鋼的彎扭失穩(wěn)；腹板高厚比減小，可提高模型的承載力和初始剛度；設(shè)置加勁肋可限制腹板和翼緣的局部屈曲，提高了模型的耗能能力和剛度。［關(guān)鍵詞］雙槽鋼組合截面懸臂構(gòu)件; 往復彎曲; 滯回性能; 有限元中圖分類號：TU391 文獻標識碼：A 文章編號：1002-848X(2016)07-0056-08
Hysteretic behavior study of cantilever member with double-channel steel composite section under reversed cyclic bendingRan Hongdong, Liang Wenlong(School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055,China)Abstract: To study the hysteretic behavior of cantilever member with double-channel steel composite section, finite element models of 8 cantilever members with double-channel steel composite sections were established under reversed cyclic bending. By changing the parameters as filling plate spacing, lateral support spacing, web depth-thickness ratio and set of stiffener, results of the models with different parameters were obtained including hysteretic curve, skeleton curve, the moment and rotation values of each stage and seismic performance index values. In addition, the mechanical properties of models were analyzed as the damage features, ductility, energy dissipation capacity, carrying capacity and stiffness degradation. The results show that the cantilever member with double-channel steel composite section has good hysteretic behavior; reduction of filling plate spacing can effectively prevent flexural torsional buckling of single limb channel steel; decrease of web depth-thickness ratio can improve the bearing capacity and initial stiffness of the model; set of stiffener can limit local buckling of flange and web, which improves the energy dissipation capacity and stiffness of the model.Keywords: cantilever member with double-channel steel composite section; reversed cyclic bending; hysteretic behavior; finite element
*國家自然科學基金項目（51208412），住房與城鄉(xiāng)建設(shè)部科研項目（2013-K2-019）,陜西省教育廳重點實驗室項目（15JS049）。作者簡介：冉紅東,副教授,碩士生導師，Email:ranhd@163.com。
