型钢混凝土十形柱空间节点受剪机理及抗剪强度研究
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摘要
为了研究型钢混凝土(SRC)十形柱空间节点在斜向荷载作用下的受剪机理、抗裂承载力及抗剪承载力,开发一套加载装置,采用柱端斜向加载方式对5个型钢混凝土十形柱空间节点进行低周反复荷载试验。观察节点核心区剪切面破坏形态,分析节点区两个主轴方向的箍筋、水平腹杆、钢腹板的应变分布规律及空间节点受剪机理和抗剪影响因素。结果表明:节点受剪面破坏为典型的剪切斜压黏结破坏;两主轴方向的箍筋、水平腹杆及钢腹板应变分布规律基本相同;空间节点受剪机理与型钢混凝土异形柱框架平面节点有着共性,但斜向荷载作用下,空间节点抗剪能力变弱,受力更为复杂。斜向加载角度对抗裂承载力影响不明显,而对抗剪承载力的影响应予以考虑,抗剪承载力与斜向荷载角度相关曲线近似于菱形。最后,基于各种配钢形式的SRC十形柱空间节点单向受剪下(沿工程轴)抗剪承载力计算方法的研究,提出在斜向荷载作用下节点抗裂承载力及抗剪承载力计算公式,计算结果与试验值吻合较好。
To investigate the failure modes,shear mechanism,crack resistance and shear bearing capacity of SRC crossshape 3D column-beam joints,the experimental investigations were conduced based on the studies of the 5 joints under oblique low-cycle repeated loading at the column end,and a set of novel loading device was developed. Strain distributions along two axial directions in the stirrups,web members,and steel web,the shear mechanism and the influencing factors of shear resistance for 3D joints were then analyzed. The test results indicate that the typical failure mode of the joint was shear diagonal compression failure. The strain distributions along two axial directions in the stirrups,web members and steel web were identical. The shear mechanism of SRC cross-shape 3D column-beam joints was similar to that of 2D planar joints. Under the oblique loading,however,the shear resistance of 3D joints may attenuate and the stresses were more complicated. The effect of oblique loading angle on crack resistance was not obvious,but its effect on shear resistance should be considered the relationship between shear bearing resistance and oblique loading angle was approximate diamond-shaped. In the end,based on the shear analysis of different SRC crossshape 3D column-beam joints under unidirectional loading,the formulas for crack resistance and shear resistance of 3D joints under the oblique loading were put forward. By the comparisons,it was found that the calculation results agreed well with the test results.
To investigate the failure modes,shear mechanism,crack resistance and shear bearing capacity of SRC crossshape 3D column-beam joints,the experimental investigations were conduced based on the studies of the 5 joints under oblique low-cycle repeated loading at the column end,and a set of novel loading device was developed. Strain distributions along two axial directions in the stirrups,web members,and steel web,the shear mechanism and the influencing factors of shear resistance for 3D joints were then analyzed. The test results indicate that the typical failure mode of the joint was shear diagonal compression failure. The strain distributions along two axial directions in the stirrups,web members and steel web were identical. The shear mechanism of SRC cross-shape 3D column-beam joints was similar to that of 2D planar joints. Under the oblique loading,however,the shear resistance of 3D joints may attenuate and the stresses were more complicated. The effect of oblique loading angle on crack resistance was not obvious,but its effect on shear resistance should be considered the relationship between shear bearing resistance and oblique loading angle was approximate diamond-shaped. In the end,based on the shear analysis of different SRC crossshape 3D column-beam joints under unidirectional loading,the formulas for crack resistance and shear resistance of 3D joints under the oblique loading were put forward. By the comparisons,it was found that the calculation results agreed well with the test results.
引文
[1]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))
[2]薛建阳,刘义,赵鸿铁,等.型钢混凝土异形柱框架节点承载力试验研究[J].土木工程学报,2011,44(5):41-48(Xue Jianyang,Liu Yi,Zhao Hongtie,et al.Experimental study of the bearing capacity of steel reinforced concrete specially-shaped column-beam joint[J].China Civil Engineering Journal,2011,44(5):41-48(in Chinese))
[3]李旭红,房贞政,陈浩德.预应力混凝土空间框架节点二维拟静力试验研究[J].地震工程与工程振动,2009,29(1):70-77(Li Xuhong,Fang Zhenzheng,Chen Haode.Experimental study on two-dimensional loading quasi-static of prestressed concrete spatial frame joint[J].Journal of Earthquake Engineering and Engineering Vibration,2009,29(1):70-77(in Chinese))
[4]周慧.空间组合节点抗震性能试验研究与理论分析[D].北京:清华大学,2011(Zhou Hui.Experimental and Theoretical study on 3D composite joints under bidirectional loading[D].Beijing:Tsinghua University,2011(in Chinese))
[5]Fujii S,Morita S.Behavior of exterior reinforced concrete beam-column-slab sub assemblages under bidirectional loading[C]//Pacific Conference on Earthquake Engineering.New Zealand:New Zealand National Society for Earthquake Engineering,1987:339-350
[6]Green T P,Leon R T,Rassati G A.Bidirectional tests on partially restrained,composite beam-to-column connections[J].Journal of Structural Engineering,2004,130(2):320-327
[7]王伟,李万祺,陈以一.空间框架梁柱节点伪静力试验研究的实现[J].建筑结构学报,2011,32(10):107-112(Wang Wei,Li Wanqi,Chen Yiyi.Realization of pseudo-static experimental study of beam-to-column joints in three dimensional frames[J].Journal of Building Structures,2011,32(10):107-112(in Chinese))
[8]JGJ 101—1996建筑抗震试验方法规程[S].北京:中国建筑工业出版社,1997(JGJ 101—1996 Specification of testing methods for earthquake resistant building[S].Beijing:China Architecture&Building Press,1997(in Chinese))
[9]赵鸿铁.钢与混凝土组合结构[M].北京:科学出版社,2001
[10]曲福来,黄承逵,徐士弢.考虑翼缘影响的异形柱框架节点抗裂性能分析[J].计算力学学报,2009,26(6):973-976(Qu Fulai,Huang Chengkui,Xu Shitao.Crack resistance of RC joints with specially shaped columns considering the effect of flange length[J].Chinese Journal of Computational Mechanics,2009,26(6):973-976(in Chinese))
[11]陈宗平,薛建阳,赵鸿铁,等.低周反复荷载作用下型钢混凝土异形柱的抗剪承载力分析[J].土木工程学报,2007,40(7):30-36(Chen Zongping,Xue Jianyang,Zhao Hongtie.Analysis on the shear capacity of irregularlyshaped steel reinforced concrete columns under cyclic reversed loading[J].China Civil Engineering Journal,2007,40(7):30-36(in Chinese))
[12]张士前.型钢混凝土十形异形柱-钢梁框架空间节点抗震性能研究[D].广西:广西大学,2012(Zhang Shiqian.Study on seismic behavior of interior space joint in steel reinforced concrete special-shaped column frame with steel beam[D].Guangxi:Guangxi University,2012(in Chinese))
[13]Vecchio F J,Collins M P.Compression response of cracked reinforced concrete[J].Journal of Structural Engineering,1993,119(12):3590-3610
[14]Hwang S J,Lu W Y,Lee H J.Shear strength prediction for reinforced concrete corbels[J].ACI Structural Journal,2000,97(4):543-552
[15]吴涛,刘伯权,邢国华.钢筋混凝土框架变梁异型节点抗震[M].北京:科学出版社,2010(Wu Tao,Liu Boquan,Xing Guohua.Seismic behavior of reinforced concrete frame joints with different depth beams[M].Beijing:Science Press,2010(in Chinese))
[16]Parra-Montesinos G,Wight J K.Modeling shear behavior of hybrid RCS beam-column connections[J].Journal of Structural Engineering,2001,127(1):3-11
[2]薛建阳,刘义,赵鸿铁,等.型钢混凝土异形柱框架节点承载力试验研究[J].土木工程学报,2011,44(5):41-48(Xue Jianyang,Liu Yi,Zhao Hongtie,et al.Experimental study of the bearing capacity of steel reinforced concrete specially-shaped column-beam joint[J].China Civil Engineering Journal,2011,44(5):41-48(in Chinese))
[3]李旭红,房贞政,陈浩德.预应力混凝土空间框架节点二维拟静力试验研究[J].地震工程与工程振动,2009,29(1):70-77(Li Xuhong,Fang Zhenzheng,Chen Haode.Experimental study on two-dimensional loading quasi-static of prestressed concrete spatial frame joint[J].Journal of Earthquake Engineering and Engineering Vibration,2009,29(1):70-77(in Chinese))
[4]周慧.空间组合节点抗震性能试验研究与理论分析[D].北京:清华大学,2011(Zhou Hui.Experimental and Theoretical study on 3D composite joints under bidirectional loading[D].Beijing:Tsinghua University,2011(in Chinese))
[5]Fujii S,Morita S.Behavior of exterior reinforced concrete beam-column-slab sub assemblages under bidirectional loading[C]//Pacific Conference on Earthquake Engineering.New Zealand:New Zealand National Society for Earthquake Engineering,1987:339-350
[6]Green T P,Leon R T,Rassati G A.Bidirectional tests on partially restrained,composite beam-to-column connections[J].Journal of Structural Engineering,2004,130(2):320-327
[7]王伟,李万祺,陈以一.空间框架梁柱节点伪静力试验研究的实现[J].建筑结构学报,2011,32(10):107-112(Wang Wei,Li Wanqi,Chen Yiyi.Realization of pseudo-static experimental study of beam-to-column joints in three dimensional frames[J].Journal of Building Structures,2011,32(10):107-112(in Chinese))
[8]JGJ 101—1996建筑抗震试验方法规程[S].北京:中国建筑工业出版社,1997(JGJ 101—1996 Specification of testing methods for earthquake resistant building[S].Beijing:China Architecture&Building Press,1997(in Chinese))
[9]赵鸿铁.钢与混凝土组合结构[M].北京:科学出版社,2001
[10]曲福来,黄承逵,徐士弢.考虑翼缘影响的异形柱框架节点抗裂性能分析[J].计算力学学报,2009,26(6):973-976(Qu Fulai,Huang Chengkui,Xu Shitao.Crack resistance of RC joints with specially shaped columns considering the effect of flange length[J].Chinese Journal of Computational Mechanics,2009,26(6):973-976(in Chinese))
[11]陈宗平,薛建阳,赵鸿铁,等.低周反复荷载作用下型钢混凝土异形柱的抗剪承载力分析[J].土木工程学报,2007,40(7):30-36(Chen Zongping,Xue Jianyang,Zhao Hongtie.Analysis on the shear capacity of irregularlyshaped steel reinforced concrete columns under cyclic reversed loading[J].China Civil Engineering Journal,2007,40(7):30-36(in Chinese))
[12]张士前.型钢混凝土十形异形柱-钢梁框架空间节点抗震性能研究[D].广西:广西大学,2012(Zhang Shiqian.Study on seismic behavior of interior space joint in steel reinforced concrete special-shaped column frame with steel beam[D].Guangxi:Guangxi University,2012(in Chinese))
[13]Vecchio F J,Collins M P.Compression response of cracked reinforced concrete[J].Journal of Structural Engineering,1993,119(12):3590-3610
[14]Hwang S J,Lu W Y,Lee H J.Shear strength prediction for reinforced concrete corbels[J].ACI Structural Journal,2000,97(4):543-552
[15]吴涛,刘伯权,邢国华.钢筋混凝土框架变梁异型节点抗震[M].北京:科学出版社,2010(Wu Tao,Liu Boquan,Xing Guohua.Seismic behavior of reinforced concrete frame joints with different depth beams[M].Beijing:Science Press,2010(in Chinese))
[16]Parra-Montesinos G,Wight J K.Modeling shear behavior of hybrid RCS beam-column connections[J].Journal of Structural Engineering,2001,127(1):3-11