鋼筋混凝土L形截面柱框架低周反復加載試驗研究
刁波,李淑春,葉英華
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(北京航空航天大學土木工程系,北京 100083)[摘要]通過兩榀比例為1/3的鋼筋混凝土L形截面柱框架結(jié)構(gòu)在反復荷載作用下的試驗,研究了L形截面柱框架結(jié)構(gòu)的破壞特征、滯回特性、梁柱出鉸順序、結(jié)構(gòu)整體剛度與層間剛度、耗能性能、延性及異形柱截面中和軸變化規(guī)律等,分析了框架整體及L形柱的扭轉(zhuǎn)效應。研究結(jié)果表明:L形截面柱框架的破壞屬于“強柱弱梁”型,抗震性能較好,框架扭轉(zhuǎn)效應較小,可忽略;結(jié)構(gòu)的位移延性系數(shù)滿足抗震規(guī)范的要求;在屈服荷載前異形柱的截面變形符合平截面假定。[關(guān)鍵詞]L形截面柱框架;擬靜力試驗;抗震性能;扭轉(zhuǎn)效應Experimental study on RC frame with L-shaped columns subjected to low-cyclical loadingDiao Bo, Li Shuchun, Ye Yinghua(Department of Civil Engineering, Beihang University, Beijing 100083, China)Abstract:Based on experiments of two reinforced concrete frames with L-shaped columns under low-cyclical loading, the scale of frames was 1/3, failure and hysteretic characteristics, plastic hinge of beam and column, whole structural stiffness and the inter-storey stiffness, energy dissipation, ductility and different positions of neutral axis were studied. Torsion effects of the frame and L-shaped column were analyzed. The experiment results indicate that the frames with L-shaped columns are destroyed due to the beam hinge, have better seismic performance, torsion deflection are small during test and the torsion effects may be ignored. The ductility of the frames can satisfy the requirement of the seismic code. Plane sections for special-shaped columns remain plane.Keywords:RC frame with L-shaped columns; pseudo-static test; seismic behavior; torsion effects*北京市自然科學基金(8052014);國家自然科學基金(50678016);國家教育振興行動計劃(BHB985-1-04)。作者簡介:刁波,教授,博士生導師,Email:diaobo@buaa.edu.cn。參考文獻[1]陳云霞,劉超,趙艷靜,等. T形、L形截面鋼筋混凝土雙向壓彎構(gòu)件正截面承載力的研究[J].建筑結(jié)構(gòu),1999,29(1):11-15.[2]鞏長江,康谷貽,姚石良,等.L形截面鋼筋混凝土框架柱受剪性能的試驗研究[J].建筑結(jié)構(gòu),1999,29(1):31-34.[3]王依群,康谷貽.異形截面框架柱扭轉(zhuǎn)分析[J].東南大學學報:自然科學版,2002,32(9):51-60.[4]王鐵成,張學輝.異形柱框架抗震性能試驗分析[J].四川建筑科學研究,2006,32(5):150-153.[5]劉威,李杰.鋼筋混凝土異型柱框架低周反復加載試驗研究[J].結(jié)構(gòu)工程師,2002(3):56-61.[6]鄭漢兵,曹萬林,馬景春,等.底部矩形柱上部異形柱邊框架抗震研究[J].世界地震工程,2002,18(4):106-110.[7]王滋軍,劉偉慶,蔣永生,等.中高層鋼筋混凝土異形柱框架結(jié)構(gòu)試驗與理論研究[J].地震工程與工程振動,2002,22(5):62-65.[8]李杰,肖建莊,陳建兵,等.鋼筋混凝土異型柱結(jié)構(gòu)振動臺試驗研究[J].土木工程學報,2002,35(3):8-12.[9]劉軍進,呂志濤,馮健. 9層(帶轉(zhuǎn)換層)鋼筋混凝土異形柱框架結(jié)構(gòu)模型振動臺試驗研究[J].建筑結(jié)構(gòu)學報,2002,23(1):21-26.[10]JGJ149—2006 混凝土異形柱結(jié)構(gòu)技術(shù)規(guī)程[S].