钢筋混凝土短肢剪力墙抗震性能试验研究
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摘要
采用1∶2缩尺模型,设计了6个T形短肢剪力墙试件和6个L形短肢剪力墙试件,以及2个T形普通剪力墙试件。通过低周反复加载试验,研究钢筋混凝土短肢剪力墙构件的抗震性能,并与普通剪力墙进行对比。观测了短肢剪力墙受力-变形-损伤-裂缝-屈服-破坏的全过程;分析了短肢剪力墙的破坏特征、滞回曲线、骨架曲线、刚度退化曲线、位移延性及截面变形规律等。研究表明:T形和L形短肢剪力墙试件在水平荷载作用下,强度和刚度退化曲线呈明显的非对称特点;在开裂之后刚度退化较快;在退化过程中刚度退化速度减缓不明显,后期的刚度退化也不趋于稳定;大偏心破坏范围内,增大轴压比可以提高试件的承载力;延性并不随轴压比一致变化,控制轴压比试件延性才能发挥到最好,减小剪跨比可增大试件延性;翼缘侧受压时的顶点位移比腹板侧受压时的要小;剪力滞后现象比较显著;破坏的主要形式为弯剪破坏;截面积相同时,T形截面比L形截面短肢剪力墙试件的承载力大,抗震性能优良;高厚比为6.5的T形短肢剪力墙试件相比其它高厚比的短肢剪力墙试件综合性能更佳。
Using 1∶ 2 reduced scale model,six T-shaped,six L-shaped short-leg shear wall specimens,and two T-shaped ordinary shear wall specimens were designed and constructed.Through the quasi-static test,the seismic performance of concrete short-leg shear wall components was studied and compared with the ordinary shear wall.The whole process of deforming-damaging-cracking-yielding-failure was observed during the test.Damage characteristics,hysteretic curves,skeleton curves,stiffness degradation,displacement ductility and cross-section deformation of the short leg shear wall specimens were discussed.Test results show that under horizontal loads,the strength and stiffness of the T-shaped and L-shaped short-leg shear wall specimens have obviously asymmetric characteristics.Degradation of the stiffness develops quickly after cracking.During the degradation process,the slowing down of the stiffness degradation is not obvious.At the late stage of the testing the stiffness degradation become unstable.Within the range of large eccentric damage,increasing the axial compression ratio can improve the bearing capacity of components.The change of ductility is not consistent with the change of axial compression ratio.The specimens exhibit the best ductile behavior only when the axial compression ratio is well controlled.Top displacement angle is smaller when the inside of the flange is in compression than when the outside of the flange is in compression.The shear lag phenomenon is quite significant.The main failure pattern is due to shear and flexure.The seismic performance of T-shaped short-leg shear wall is better than the L-shaped shot-leg shear walls.Height to thickness ratio of 6.5 in the short-leg shear wall specimens possesses better seismic performance compared with others.
Using 1∶ 2 reduced scale model,six T-shaped,six L-shaped short-leg shear wall specimens,and two T-shaped ordinary shear wall specimens were designed and constructed.Through the quasi-static test,the seismic performance of concrete short-leg shear wall components was studied and compared with the ordinary shear wall.The whole process of deforming-damaging-cracking-yielding-failure was observed during the test.Damage characteristics,hysteretic curves,skeleton curves,stiffness degradation,displacement ductility and cross-section deformation of the short leg shear wall specimens were discussed.Test results show that under horizontal loads,the strength and stiffness of the T-shaped and L-shaped short-leg shear wall specimens have obviously asymmetric characteristics.Degradation of the stiffness develops quickly after cracking.During the degradation process,the slowing down of the stiffness degradation is not obvious.At the late stage of the testing the stiffness degradation become unstable.Within the range of large eccentric damage,increasing the axial compression ratio can improve the bearing capacity of components.The change of ductility is not consistent with the change of axial compression ratio.The specimens exhibit the best ductile behavior only when the axial compression ratio is well controlled.Top displacement angle is smaller when the inside of the flange is in compression than when the outside of the flange is in compression.The shear lag phenomenon is quite significant.The main failure pattern is due to shear and flexure.The seismic performance of T-shaped short-leg shear wall is better than the L-shaped shot-leg shear walls.Height to thickness ratio of 6.5 in the short-leg shear wall specimens possesses better seismic performance compared with others.
引文
[1]JGJ 3—2002高层建筑混凝土结构技术规程[S].(JGJ 3—2002 Technical specification for concretestructures of high-rise building[S].(in Chinese))
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[6]周云,刘自力,刘丰,等.一字形短肢剪力墙抗震性能的模型试验研究[J].建筑结构学报,2008,29(4):81-88.(ZHOU Yun,LIU Zili,LIU Feng,et al.Experimental study on seismic performance of the short-pier shear wall(SPW)with rectangular section[J].Journal of Building Structures,20082,9(4):81-88.inChinese)
[7]李杰,吴建营,周德源,等.L形和T形宽肢异形柱低周反复荷载试验研究[J].建筑结构学报,2002,23(1):9-15.(LI Jie,WU Jianying,ZHOU Deyuan,et al.Experimental research on wide flange speciallyshaped section columns subjected to cyclic loading[J].Journal of Building Structures,2002,23(1):9-15.(inChinese))
[8]李青宁,王宁,蔡卫宁.T形短肢剪力墙弹塑性模型及地震反应分析[J].地震工程与工程振动,2004,24(2):69-74.(LI Qingning,WANG Ning,CAI Weining.Elastoplastic model and seismic analysis of T-Shapedshort-leg shear wall[J].Earthquake Engineering andEngineering Vibration,2004,24(2):69-74.(inChinese))
[9]彭飞,程文襄,陆和燕,等.对称双肢短肢剪力墙的拟静力试验研究[J].建筑结构学报,2008,29(1):64-69.(PENG Fei,CHENG Wenrang,LU Heyan,et al.Quasi-static test research of symmetric double short-limb shear walls[J].Journal of Building Structures,2008,29(1):64-69.(in Chinese))
[10]张守军,李青宁.基于柔度法的异形截面钢筋混凝土构件非线性分析[J].世界地震工程,2008,24(1):34-39.(ZHANG Shoujun,LI Qingning.Nonlineranalysis mordel for special-shaped RC beam-columnmembers[J].World Earthquake Engineering,2008,24(1):34-39.(in Chinese))
[11]张守军,李青宁,郭泽英,等.T形截面短肢剪力墙剪滞效应及其影响[J].工业建筑,2007,37(10):38-41.(Zhang Shoujun,Li Qingning,Guo Zeying,et al.Shear lag and its effects of T-shaped short-leg shear wall[J].Industrial Construction,2007,37(10):38-41.(in Chinese))
[2]曹万林,王丽.钢筋混凝土带暗支撑Z形截面短肢剪力墙抗震性能试验研究[J].世界地震工程,2004,20(3):84-89.(CAO Wanlin,WANG Li.Experimentalstudy on seismic performance of Z-shaped short pier RCshear wall with concealed bracings[J].WorldInformation on Earthquake Engineering,2004,20(3):84-89.(in Chinese))
[3]刘伟,王娱,朱蕴东.双肢短肢剪力墙结构抗震性能试验研究[J].世界地震工程,2004,20(2),81-85.(LIU Wei,WANG Yu,ZHU Yundong.Experimentalresearch on the short-limb shear wall[J].WorldInformation on Earthquake Engineering,2004,20(2),81-85.(in Chinese))
[4]程绍革,陈善阳,刘经伟.高层建筑短肢剪力墙结构振动台试验研究[J].建筑科学2,000,16(1):12-16.(CHENG Shaoge,CHEN Shanyang,LIU Jingwei.Ashaking table test on shear wall structure with framedshort pillars for high-rise buildings[J].BuildingScience,20001,6(1):12-16.(in Chinese))
[5]黄东升,程文襄,彭飞.对称双肢短肢剪力墙的低周反复荷载试验研究[J].建筑结构学报,2005,26(3):51-56.(HUANG Dongsheng,CHENG Wenrang,PENG Fei.Low-cycle loading experiment study onsymmetric double short-pier shear walls[J].Journal ofBuilding Structures,2005,26(3):51-56.(inChinese))
[6]周云,刘自力,刘丰,等.一字形短肢剪力墙抗震性能的模型试验研究[J].建筑结构学报,2008,29(4):81-88.(ZHOU Yun,LIU Zili,LIU Feng,et al.Experimental study on seismic performance of the short-pier shear wall(SPW)with rectangular section[J].Journal of Building Structures,20082,9(4):81-88.inChinese)
[7]李杰,吴建营,周德源,等.L形和T形宽肢异形柱低周反复荷载试验研究[J].建筑结构学报,2002,23(1):9-15.(LI Jie,WU Jianying,ZHOU Deyuan,et al.Experimental research on wide flange speciallyshaped section columns subjected to cyclic loading[J].Journal of Building Structures,2002,23(1):9-15.(inChinese))
[8]李青宁,王宁,蔡卫宁.T形短肢剪力墙弹塑性模型及地震反应分析[J].地震工程与工程振动,2004,24(2):69-74.(LI Qingning,WANG Ning,CAI Weining.Elastoplastic model and seismic analysis of T-Shapedshort-leg shear wall[J].Earthquake Engineering andEngineering Vibration,2004,24(2):69-74.(inChinese))
[9]彭飞,程文襄,陆和燕,等.对称双肢短肢剪力墙的拟静力试验研究[J].建筑结构学报,2008,29(1):64-69.(PENG Fei,CHENG Wenrang,LU Heyan,et al.Quasi-static test research of symmetric double short-limb shear walls[J].Journal of Building Structures,2008,29(1):64-69.(in Chinese))
[10]张守军,李青宁.基于柔度法的异形截面钢筋混凝土构件非线性分析[J].世界地震工程,2008,24(1):34-39.(ZHANG Shoujun,LI Qingning.Nonlineranalysis mordel for special-shaped RC beam-columnmembers[J].World Earthquake Engineering,2008,24(1):34-39.(in Chinese))
[11]张守军,李青宁,郭泽英,等.T形截面短肢剪力墙剪滞效应及其影响[J].工业建筑,2007,37(10):38-41.(Zhang Shoujun,Li Qingning,Guo Zeying,et al.Shear lag and its effects of T-shaped short-leg shear wall[J].Industrial Construction,2007,37(10):38-41.(in Chinese))
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