偏心钢筋混凝土框-剪结构模型的振动台试验
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摘要
目的研究钢筋混凝土偏心框架-剪力墙结构在地震作用下受力性能.方法采用EL Centro波逐级加载方式对钢筋混凝土偏心框架-剪力墙结构模型进行振动台试验,对结构的破坏形态、破坏程度,以及试验现象进行分析.结果当地震波最大加速度峰值为4 m.s-2时,结构内部产生微裂缝.当地震波最大加速度峰值超过6 m.s-2时,结构破坏顺序为框架梁开裂,柱根部产生裂缝,塑性铰形成.结论随着裂缝和塑性变形的发展,结构的各阶频率随之下降,以第一频率下降的速度最快,阻尼也相应的增加.结构抗侧力构件的不对称,将使得结构在地震荷载作用下产生扭转,使得边缘构件负担加重,尤其是角柱更是结构的薄弱环节,在设计中应该充分重视.
In order to research the performance of the RC eccentricity frame-wall structures,shaking table tests of three-story reinforced concrete frame-wall model were carried out by inputting different degrees of El-centre wave and the test analysis was introduced in this paper.Wispy crack appeared when the maximal acceleration reached 4 m·s-2,and when the maximal acceleration reached 6 m·s-2,destructive sequences were beam split,column split and plastic forming.Through the test,we can obtain the conclusions as the following:with the development of crack and plastic distortion,the frequency of every model is decreased and the speed of decline for first frequency is the fastest.At the same time,damping of every model is increased.The dissymmetry of the structural members for resisting the lateral load will make the structure rotate.The rotation will increase the burden of members on the edge of structures.As a result,the corner column which is the weakest part should be attached importance to in the design.
In order to research the performance of the RC eccentricity frame-wall structures,shaking table tests of three-story reinforced concrete frame-wall model were carried out by inputting different degrees of El-centre wave and the test analysis was introduced in this paper.Wispy crack appeared when the maximal acceleration reached 4 m·s-2,and when the maximal acceleration reached 6 m·s-2,destructive sequences were beam split,column split and plastic forming.Through the test,we can obtain the conclusions as the following:with the development of crack and plastic distortion,the frequency of every model is decreased and the speed of decline for first frequency is the fastest.At the same time,damping of every model is increased.The dissymmetry of the structural members for resisting the lateral load will make the structure rotate.The rotation will increase the burden of members on the edge of structures.As a result,the corner column which is the weakest part should be attached importance to in the design.
引文
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[11]吕西林,卢文生.R.C.框架结构的振动台试验和面向设计的时程分析方法[J].地震工程与工程振动,1998,18(2):48-58.
[2]Linda P,Bachmann H.Dynamic modeling and designof earthquake-resistant walls[J].EESD,1994,23:1331-1350.
[3]Colotti V.Shear behavior of R/C structural walls[J].Journal of Structure Engineering,ASCE,1993,119(3):728-746.
[4]Vulcano A,Bertero V V.Analytical model for predi-cating the lateral response of RC shear wall:evalua-tion of their reliability[R].Tokyo:Kyoto,1988.
[5]朱伯龙.结构抗震试验[M].北京:地震出版社,1989.
[6]刘航,蓝宗建,梁书亭,等.底层框架多层砖房模型振动台试验研究[J].东南大学学报:自然科学版,1996,26(5):131-136.
[7]李杰,肖建庄,陈建兵,等.钢筋混凝土异型柱结构振动台试验研究[J].土木工程学报,2002,35(3):7-12.
[8]杜宏彪,沈聚敏.空间钢筋混凝土框架结构模型的振动台试验研究[J].建筑结构学报,1995,16(1):60-69.
[9]施卫星,徐磊.七层混凝土小型空心砌块房屋振动台试验研究[J].工程抗震,1999(3):22-25.
[10]张晋,吕志涛.短肢剪力墙筒体结构模型振动台试验研究[J].东南大学学报:自然科学版,2001,31(6):4-8.
[11]吕西林,卢文生.R.C.框架结构的振动台试验和面向设计的时程分析方法[J].地震工程与工程振动,1998,18(2):48-58.
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