超高轴压比区域约束混凝土柱抗震性能试验研究
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摘要
对8根混凝土设计强度等级为C40,l0/b=8.8的约束混凝土柱进行了拟静力试验,其中3根为普通约束混凝土柱,5根为区域约束混凝土柱,分别采用1.10、1.25及1.35设计轴压比。区域约束的方式保证了混凝土的延性及强度的充分发挥,高轴压比有效限制了受拉裂缝的开展,提高了剪压区受荷面积及试件初始刚度。在试验轴压比范围内,区域约束试件水平承载力、延性及耗能能力随轴压增大而增大,同时,箍筋的应力也随轴压比增大而增大,且应力分布均匀,区域约束试件也较普通约束试件的刚度退化幅度小。研究结果表明:区域约束混凝土柱在超高轴压比下具有良好的力学性能及抗震性能,且轴压比越高性能越好;对于区域约束混凝土柱,可适当放宽GB 50011—2010《建筑设计抗震规范》对轴压比的限值。
Super-high axial compression ratios up to 1.10,1.25 and 1.35 were applied in quasi-static tests.Three normal confined concrete(NCC) columns and five regional confined concrete(RCC) columns with concrete strength 40 MPa,l0/b=8.8 were tested.Regional confinement can ensure the development of strength and ductility of concrete,and high axial compression can limit the development of cracks,resulting in increased load carrying area and initial rigidity of specimen.In the tests,the load carrying capacity,ductility and energy dissipation capacity of RCC columns were increased with the increase of axial compression ratio.Stresses of stirrups were well-distributed and also increased with the increase of axial compression ratio.The rigidity of RCC columns degenerated slowly than NCC columns.The results indicate that RCC columns have good mechanical behavior and excellent anti-seismic property under super-high axial compression ratio,the higher of axial compression ratio is,the better of mechanical behavior and the anti-seismic properties are.It is suitable and reliable for RCC structures to exceed the specifications of 'Code for seismic design of buildings' on axial compression ratios.
Super-high axial compression ratios up to 1.10,1.25 and 1.35 were applied in quasi-static tests.Three normal confined concrete(NCC) columns and five regional confined concrete(RCC) columns with concrete strength 40 MPa,l0/b=8.8 were tested.Regional confinement can ensure the development of strength and ductility of concrete,and high axial compression can limit the development of cracks,resulting in increased load carrying area and initial rigidity of specimen.In the tests,the load carrying capacity,ductility and energy dissipation capacity of RCC columns were increased with the increase of axial compression ratio.Stresses of stirrups were well-distributed and also increased with the increase of axial compression ratio.The rigidity of RCC columns degenerated slowly than NCC columns.The results indicate that RCC columns have good mechanical behavior and excellent anti-seismic property under super-high axial compression ratio,the higher of axial compression ratio is,the better of mechanical behavior and the anti-seismic properties are.It is suitable and reliable for RCC structures to exceed the specifications of 'Code for seismic design of buildings' on axial compression ratios.
引文
[1]GB 50011—2010建筑设计抗震规范[S].北京:中国建筑工业出版社,2010.(GB 50011—2010 Codefor seismic design of buildings[S].Beijing:ChinaArchitecture&building Press,2010.(in Chinese))
[2]曹新明,杨雪瑞,罗霄溢.区域约束混凝土小偏心受压柱试验研究[C]//现代混凝土基本理论及工程应用.北京:中国建筑工业出版社,2009:579-583.(CaoXinming,Yang Xuerui,Luo Xiaoyi.Experimentalresearch on regional confined concrete columns undereccentric load[C]//Elemental Theories andConstruction Applications of Modern Concrete.Beijing:China Architecture&Building Press,2009:579-583.(in Chinese))
[3]姜维山,马乐为,孙慧中.钢筋混凝土柱轴压比设计[J].建筑结构,2002,32(10):70-73.(JiangWeishan,Ma Lewei,Sun Huizhong.Design of axialcompressive ratio of RC frame columns[J].BuildingStructure,2002,32(10):70-73.(in Chinese))
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[5]张国军,吕西林,刘伯权.钢筋混凝土框架柱在轴压比超限时抗震性能的研究[J].土木工程学报,2006,39(3):48-54.(Zhang Guojun,Lu Xilin,LiuBoquan.Seismic behavior of reinforced concrete framecolumns with excessive axial compression ratios[J].China Civil Engineering Journal,2006,39(3):48-54.(in Chinese))
[6]肖建庄,李杰.钢筋混凝土框架柱轴压比限值问题研究[J].世界地震工程1998,14(4):17-22.(XiaoJianzhuang,Li Jie.Investigation on limit values of axialcompressive stress ratio for RC frame columns[J].World Information of Earthquake Engineering,1998,14(4):17-22.(in Chinese))
[7]曹新明,杨力列,朱国良.区域约束混凝土轴心受压矩形柱受力性能研究[J].重庆建筑大学学报,2008,30(3):83-86.(Cao Xinming,Yang Lilei,ZhuGuoliang.Mechanical properties of regional rectangularconcrete columns under axial loads[J].Journal ofChongqing Jianzhu University,2008,30(3):83-86.(in Chinese))
[8]庞新宾.区域约束混凝土柱往复荷载作用下轴压比限值研究[D].贵阳:贵州大学,2011:28-29.(PangXinbin.Research on limitation of axial compressionratio of regional confined concrete cyclic loaded columns[D].Guiyang:Guizhou University,2011:28-29.(inChinese))
[9]JGJ 3—2010高层建筑混凝土结构技术规程[S].北京:中国建筑工业出版社,2011.(JGJ 3—2010Technical specification for concrete structures of tallbuilding[S].Beijing:China Architecture&BuildingPress,2011.(in Chinese))
[10]赵国藩.高等钢筋混凝土结构学[M].北京:机械工业出版社,2005:404.(Zhao Guofan.Advanced theoryof reinforced concrete structures[M].Beijing:ChinaMachine Press,2005:404.(in Chinese))
[2]曹新明,杨雪瑞,罗霄溢.区域约束混凝土小偏心受压柱试验研究[C]//现代混凝土基本理论及工程应用.北京:中国建筑工业出版社,2009:579-583.(CaoXinming,Yang Xuerui,Luo Xiaoyi.Experimentalresearch on regional confined concrete columns undereccentric load[C]//Elemental Theories andConstruction Applications of Modern Concrete.Beijing:China Architecture&Building Press,2009:579-583.(in Chinese))
[3]姜维山,马乐为,孙慧中.钢筋混凝土柱轴压比设计[J].建筑结构,2002,32(10):70-73.(JiangWeishan,Ma Lewei,Sun Huizhong.Design of axialcompressive ratio of RC frame columns[J].BuildingStructure,2002,32(10):70-73.(in Chinese))
[4]Sheikh S A,Li Y.Towards the performance:baseddesign of confined concrete[C]//Proceedings ofInternational Symposium on Confined Concrete.Changsha:Hunan University,2004:9.
[5]张国军,吕西林,刘伯权.钢筋混凝土框架柱在轴压比超限时抗震性能的研究[J].土木工程学报,2006,39(3):48-54.(Zhang Guojun,Lu Xilin,LiuBoquan.Seismic behavior of reinforced concrete framecolumns with excessive axial compression ratios[J].China Civil Engineering Journal,2006,39(3):48-54.(in Chinese))
[6]肖建庄,李杰.钢筋混凝土框架柱轴压比限值问题研究[J].世界地震工程1998,14(4):17-22.(XiaoJianzhuang,Li Jie.Investigation on limit values of axialcompressive stress ratio for RC frame columns[J].World Information of Earthquake Engineering,1998,14(4):17-22.(in Chinese))
[7]曹新明,杨力列,朱国良.区域约束混凝土轴心受压矩形柱受力性能研究[J].重庆建筑大学学报,2008,30(3):83-86.(Cao Xinming,Yang Lilei,ZhuGuoliang.Mechanical properties of regional rectangularconcrete columns under axial loads[J].Journal ofChongqing Jianzhu University,2008,30(3):83-86.(in Chinese))
[8]庞新宾.区域约束混凝土柱往复荷载作用下轴压比限值研究[D].贵阳:贵州大学,2011:28-29.(PangXinbin.Research on limitation of axial compressionratio of regional confined concrete cyclic loaded columns[D].Guiyang:Guizhou University,2011:28-29.(inChinese))
[9]JGJ 3—2010高层建筑混凝土结构技术规程[S].北京:中国建筑工业出版社,2011.(JGJ 3—2010Technical specification for concrete structures of tallbuilding[S].Beijing:China Architecture&BuildingPress,2011.(in Chinese))
[10]赵国藩.高等钢筋混凝土结构学[M].北京:机械工业出版社,2005:404.(Zhao Guofan.Advanced theoryof reinforced concrete structures[M].Beijing:ChinaMachine Press,2005:404.(in Chinese))
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