空腹式型钢混凝土异形柱中框架抗侧刚度试验研究
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摘要
通过对1榀1/2.5比例两跨三层的空腹式型钢混凝土(SRC)异形柱中框架在反复荷载作用下的试验研究,分析了结构的弹塑性特征以及整体和层间抗侧刚度的退化过程。通过分析可知:空腹式SRC异形柱框架沿竖向的刚度分布较均匀;层刚度与整体刚度的退化均表现出由快到慢的规律;获得了层间位移角的变化与层刚度退化之间的关系;结构正、负向弹塑性性能接近,极限层间位移角大于规范规定的限值,抗倒塌能力强;空腹式型钢混凝土异形柱中框架的延性优于钢筋混凝土异形柱框架;结构破坏时可以形成梁铰机制,符合"强柱弱梁"的要求。
According to the experimental study on a 1/2.5-scaled model of two-span and three-story middle frame composed of reinforced concrete beams and lattice steel reinforced concrete(SRC) special-shaped columns under reversed loading,the elasto-plastic feature,integral and inter-story lateral stiffness degradation of the structure were analyzed.The test results indicate that the lattice steel reinforced concrete middle frame has uniform vertical stiffness,the degradation of which shows a fast to slow regulation.The relationship between story drift and the ratio of story stiffness degradation was obtained.The elasto-plastic behavior of the structure in positive and negative directions is similar.The ultimate elasto-plastic story drift rotation is larger than the limit value specified by the code,indicating the high capacity of collapse resistance.Compared with the reinforced concrete frame with special-shaped columns,the ductility of lattice SRC frame structure is better.The failure mechanism of the structure is the beam-hinged mechanism,satisfying the seismic design principle of "Strong Column and Weak Beam".
According to the experimental study on a 1/2.5-scaled model of two-span and three-story middle frame composed of reinforced concrete beams and lattice steel reinforced concrete(SRC) special-shaped columns under reversed loading,the elasto-plastic feature,integral and inter-story lateral stiffness degradation of the structure were analyzed.The test results indicate that the lattice steel reinforced concrete middle frame has uniform vertical stiffness,the degradation of which shows a fast to slow regulation.The relationship between story drift and the ratio of story stiffness degradation was obtained.The elasto-plastic behavior of the structure in positive and negative directions is similar.The ultimate elasto-plastic story drift rotation is larger than the limit value specified by the code,indicating the high capacity of collapse resistance.Compared with the reinforced concrete frame with special-shaped columns,the ductility of lattice SRC frame structure is better.The failure mechanism of the structure is the beam-hinged mechanism,satisfying the seismic design principle of "Strong Column and Weak Beam".
引文
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[2]薛建阳.型钢混凝土异形柱结构的性能、设计方法及其工程应用[M].北京:中国建筑工业出版社,2011:1―2.Xue Jianyang.The performance,designing method and engineering application of steel reinforced concrete special-shaped column structure[M].Beijing:China Architecture&Building Press,2011:1―2.(in Chinese)
[3]Hsu C T T.Biaxial loaded L-shaped reinforced concrete columns[J].Journal of Structural Engineering,1985,111(12):2576―2595.
[4]Kawakami M,Tokuda H,Kagaya M,et al.Limit states of cracking and ultimate strength of arbitrary concrete sections under biaxial loading[J].ACI Journal,1985,82(2):203―212.
[5]李哲,张小峰,郭增玉,等.钢骨混凝土T形截面短柱力学性能的试验研究[J].土木工程学报,2007,40(1):1―5.Li Zhe,Zhang Xiaofeng,Guo Zengyu,et al.Experimental study on the mechanical property of steel reinforced concrete short columns of T-shaped cross-section[J].China Civil Engineering Journal,2007,40(1):1―5.(in Chinese)
[6]陈宗平,薛建阳,赵鸿铁,等.型钢混凝土异形柱抗震性能试验研究[J].建筑结构学报,2007,28(3):53―61.Chen Zongping,Xue Jianyang,Zhao Hongtie,et al.Experimental research on seismic behavior of steel reinforced concrete special-shaped columns[J].Journal of Building Structures,2007,28(3):53―61.(in Chinese)
[7]曹万林,樊太,张维斌,等.异形截面钢骨混凝土柱抗震性能试验研究[J].世界地震工程,2004,20(2):64―69.Cao Wanlin,Fan Tai,Zhang Weibin,et al.Experimental research on seismic behavior of special-shaped SRC columns[J].World Earthquake Engineering,2004,20(2):64―69.(in Chinese)
[8]薛建阳,刘义,赵鸿铁,等.型钢混凝土异形柱框架节点抗震性能试验研究[J].建筑结构学报,2009,30(4):69―77.Xue Jianyang,Liu Yi,Zhao Hongtie,et al.Experimental study on seismic behavior of steel reinforced concrete special-shaped column-beam joints[J].Journal of Building Structures,2009,30(4):69―77.(in Chinese)
[9]杨涛,张喜德.T形截面钢骨混凝土异形柱框架抗震性能[J].土木建筑与环境工程,2009,31(2):33―37.Yang Tao,Zhang Xide.Research on seismic behavior of frame with T-shaped SRC columns[J].Journal of Civil,Architectural and Environmental Engineering,2009,31(2):33―37.(in Chinese)
[10]陈宗平.型钢混凝土异形柱的基本力学行为及抗震性能研究[D].西安:西安建筑科技大学,2007.Chen Zongping.Study on basic mechanical behavior and seismic performance of steel reinforced concrete special-shaped columns[D].Xi’an:Xi’an University of Architecture and Technology,2007.(in Chinese)
[11]GB 50011-2010,建筑抗震设计规范[S].北京:中国建筑工业出版社,2010.GB 50011-2010,Code for seismic design of buildings[S].Beijing:China Architecture and Building Press,2010.(in Chinese)
[12]赵艳静,李忠献,陈云霞.四级抗震等级时钢筋混凝土异形柱轴压比限值的研究[J].建筑结构学报,2004,25(3):58―62.Zhao Yanjing,Li Zhongxian,Chen Yunxia.Research on limit values of axial compression ratios of specially shaped RC columns in case of 4th seismic grade[J].Journal of Building Structures,2004,25(3):58―62.(in Chinese)
[13]王铁成,张学辉,康谷贻.两种混凝土异形柱框架抗震性能试验对比[J].天津大学学报,2007,40(7):791―798.Wang Tiecheng,Zhang Xuehui,Kang Guyi.Experimental comparison of seismic behavior of two RC frames with specially shaped columns[J].Journal of Tianjin University,2007,40(7):791―798.(in Chinese)
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