钢筋混凝土核心筒抗震性能试验研究
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摘要
设计了5个钢筋混凝土核心筒试件并进行了拟静力试验,对其开裂过程、屈服顺序、滞回性能、耗能能力、承载力、延性、变形能力、刚度退化、截面应变及剪力滞后等进行研究,得到了试件开裂、屈服直至破坏时的荷载,分析了核心筒的破坏机理和较大塑性变形区域受力情况,研究了试件高宽比、连梁纵筋配筋率、连梁跨高比及加载角度等因素对核心筒的破坏模式、承载力、延性、耗能能力和剪力滞后的影响。研究结果表明,高宽比对核心筒结构的承载力和变形性能有较大影响,并决定着核心筒的破坏模式;过度增大连梁纵筋配筋率在提高侧向承载力的同时降低了试件的延性;增大连梁跨高比可以显著提高核心筒的侧向刚度和承载力,但也严重影响了试件开裂后的性能,变形能力较差;不同加载角度的侧向力改变了整个核心筒的受力承载模式,各墙肢积极参与受力,空间效应明显,增大加载角度仍可获得较好的滞回性能。
The pseudo-static test of five reinforced concrete core wall specimens were carried out.The cracking process,yielding sequence,hysteretic behavior,energy dissipation capacity,bearing capacity,ductility,deformation performance,stiffness degradation,section strain and shear lag phenomenon of core walls were investigated.The cracking,yielding and ultimate loads were obtained.The failure mechanisms of core walls and force distribution in large plastic deformation regions were also analyzed.The influences of the height-width ratio,reinforcement ratio of coupling beam,span-depth ratio of coupling beam and loading direction on the failure mode,bearing capacity,ductility,energy dissipation and shear lag of core walls were studied systemically.The test results indicate that the ratio of height to width not only has effect on the bearing capacity and deformation,but also determines the failure mode of core walls.The bearing capacity of core walls increases and displacement ductility reduces with the excessive increase of reinforcement ratio of coupling beams.The lateral stiffness and strength of core walls can be improved while the deformation capacity and the behavior after cracking can be affected adversely with the significant increase of the span-depth ratio of coupling beams.The bearing mode of core walls can be changed by altering of the lateral loading direction,resulting in the increased force area of wall piers due to the obvious spatial effect.A better hysteretic behavior of core walls can be obtained with the increase of the loading angle.
The pseudo-static test of five reinforced concrete core wall specimens were carried out.The cracking process,yielding sequence,hysteretic behavior,energy dissipation capacity,bearing capacity,ductility,deformation performance,stiffness degradation,section strain and shear lag phenomenon of core walls were investigated.The cracking,yielding and ultimate loads were obtained.The failure mechanisms of core walls and force distribution in large plastic deformation regions were also analyzed.The influences of the height-width ratio,reinforcement ratio of coupling beam,span-depth ratio of coupling beam and loading direction on the failure mode,bearing capacity,ductility,energy dissipation and shear lag of core walls were studied systemically.The test results indicate that the ratio of height to width not only has effect on the bearing capacity and deformation,but also determines the failure mode of core walls.The bearing capacity of core walls increases and displacement ductility reduces with the excessive increase of reinforcement ratio of coupling beams.The lateral stiffness and strength of core walls can be improved while the deformation capacity and the behavior after cracking can be affected adversely with the significant increase of the span-depth ratio of coupling beams.The bearing mode of core walls can be changed by altering of the lateral loading direction,resulting in the increased force area of wall piers due to the obvious spatial effect.A better hysteretic behavior of core walls can be obtained with the increase of the loading angle.
引文
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[6]曹万林,黄选明,卢智成,等.钢筋混凝土带暗支撑核心筒体抗震性能试验研究[J].地震工程与工程振动,2005,25(3):81-86.(Cao Wanlin,HuangXuanming,Lu Zhicheng,et al.Experimental study onseismic behavior of reinforced concrete core walls withconcealed bracings[J].Earthquake Engineering andEngineering Vibration,2005,25(3):81-86.(inChinese))
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[8]贾鹏,杜修力,赵均.不同轴压比钢筋混凝土核心筒抗震性能[J].北京工业大学学报,2009,35(1):63-69.(Jia Peng,Du Xiuli,Zhao Jun.Seismicbehavior of reinforced concrete core wall under differentaxial load ratio[J].Journal of Beijing University ofTechnology,20093,5(1):63-69.(in Chinese))
[9]刘清山.抗震剪力墙小跨高比连梁的理论分析及试验研究[D].西安:西安建筑科技大学,2006:69-71.(Liu Qingshan.Theoretical analysis and experimentalstudy on coupling beam with small span-to-depth ratioin seismic coupled shear walls structure[D].Xi’an:Xi’an University of Architecture&Technology,2006:69-71.(in Chinese))
[2]Makoto Maruta,Norio Suzuki,Takashi Miyashitae,t al.Structural capacities of H-shaped RC core wallsubjected to lateral load and torsion[C]//The 12thWorld Conference on Earthquake Engineering.PaperNo.1028.Silverstream,N.Z.:New Zealand Societyfor Earthquake Engineering,1999.
[3]Tadaharu Nakachi,Tetsuo Toda,Ken Tabata.Experimental study on deformation capacity ofreinforced concrete core walls after yielding[C]//The11th World Conference on Earthquake Engineering.Paper No.1747.Acapulco,Mexico:SociedadMexicana De Ingenieria Sismica,1996.
[4]Habasaki Atsushi,Kitada Yoshio,Nishikawa Takao,etal.Multi-directional loading test for RC seismic shearwalls[C]//The 12th World Conference on EarthquakeEngineering.Paper No.0454.Silverstream,N.Z.:New Zealand Society for Earthquake Engineering,1999.
[5]吕西林,李俊兰.钢筋混凝土核心筒体抗震性能试验研究[J].地震工程与工程振动,2002,22(3):42-50.(Lu Xilin,Li Junlan.Seismic behavior ofreinforced concrete core walls subjected to cyclicloading[J].Earthquake Engineering and EngineeringVibration,2002,22(3):42-50.(in Chinese))
[6]曹万林,黄选明,卢智成,等.钢筋混凝土带暗支撑核心筒体抗震性能试验研究[J].地震工程与工程振动,2005,25(3):81-86.(Cao Wanlin,HuangXuanming,Lu Zhicheng,et al.Experimental study onseismic behavior of reinforced concrete core walls withconcealed bracings[J].Earthquake Engineering andEngineering Vibration,2005,25(3):81-86.(inChinese))
[7]杜修力,贾鹏,赵均.不同连梁跨高比混凝土核心筒抗震性能试验研究[J].建筑结构学报,2009,30(增刊):5-9.(DU Xiuli,JIA Peng,ZHAO Jun.Experimental study on seismic behavior of reinforcedconcrete core walls with various span-depth ratio ofcoupling beam[J].Journal of Building Structures,2009,30(Suppl.):5-9.(in Chinese))
[8]贾鹏,杜修力,赵均.不同轴压比钢筋混凝土核心筒抗震性能[J].北京工业大学学报,2009,35(1):63-69.(Jia Peng,Du Xiuli,Zhao Jun.Seismicbehavior of reinforced concrete core wall under differentaxial load ratio[J].Journal of Beijing University ofTechnology,20093,5(1):63-69.(in Chinese))
[9]刘清山.抗震剪力墙小跨高比连梁的理论分析及试验研究[D].西安:西安建筑科技大学,2006:69-71.(Liu Qingshan.Theoretical analysis and experimentalstudy on coupling beam with small span-to-depth ratioin seismic coupled shear walls structure[D].Xi’an:Xi’an University of Architecture&Technology,2006:69-71.(in Chinese))
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