高性能混凝土剪力墙基于性能的抗震设计截面延性分析
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摘要
根据剪力墙截面的特点,提出采用分段约束箍筋改善高性能混凝土剪力墙截面的延性,针对剪力墙截面的受力特点和配筋形式,研究了分段约束箍筋对高性能混凝土剪力墙截面延性的影响;提出剪力墙截面屈服曲率和极限曲率的简化计算公式,分析了剪力墙截面相对受压区高度与曲率延性之间的关系,推导了剪力墙截面曲率延性与约束箍筋数量之间的关系。试验结果和算例分析表明:约束箍筋的作用对高性能混凝土剪力墙截面屈服曲率的影响较小,但对极限曲率的影响较大;剪力墙截面的曲率延性与轴压比、分段约束箍筋的数量、约束范围、截面端部约束混凝土的设计参数等因素有关。
According to the characteristics of shear wall cross sections,a new piecewise confining stirrup is suggested to improve the curvature ductility of high performance concrete shear walls.Based on the section property and special configuration of the stirrup,the effects of piecewise confining stirrup on the curvature ductility of high performance concrete shear walls are analyzed and calculation formulas used for evaluating the yielding and ultimate curvatures for the cross section of shear walls with piecewise confining stirrup are derived.The relationship between the depth of compression zone and the curvature ductility is analyzed and the relationship between the curvature ductility of shear wall cross section and the amount of confinement reinforcement is derived.Case studies and sample analysis show that the effect of confining stirrup on the ultimate curvature for the cross section of shear walls is much more significant than that on the yielding curvature.The curvature ductility for the cross section of shear walls is related to the axial compressive ratio,the amount and range of confinement reinforcement,and the design parameters of confined concrete core at the end of section.
According to the characteristics of shear wall cross sections,a new piecewise confining stirrup is suggested to improve the curvature ductility of high performance concrete shear walls.Based on the section property and special configuration of the stirrup,the effects of piecewise confining stirrup on the curvature ductility of high performance concrete shear walls are analyzed and calculation formulas used for evaluating the yielding and ultimate curvatures for the cross section of shear walls with piecewise confining stirrup are derived.The relationship between the depth of compression zone and the curvature ductility is analyzed and the relationship between the curvature ductility of shear wall cross section and the amount of confinement reinforcement is derived.Case studies and sample analysis show that the effect of confining stirrup on the ultimate curvature for the cross section of shear walls is much more significant than that on the yielding curvature.The curvature ductility for the cross section of shear walls is related to the axial compressive ratio,the amount and range of confinement reinforcement,and the design parameters of confined concrete core at the end of section.
引文
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[5]Oh Young Hun,Han Sang Whan,Lee Li Hyung.Effect of boundary element details on the seismic deformation capacity of structural walls[J].Earthquake Engineering and Structural Dynamics,2002,31(8):1583―1602.
[6]梁兴文,邓明科.高性能混凝土剪力墙性能设计理论的试验研究[J].建筑结构学报,2007,28(5):80―88.Liang Xingwen,Deng Mingke.Experimental study on performance-based seismic design of high performance concrete shear wall[J].Journal of Building Structures,2007,28(5):80―88.(in Chinese)
[7]Priestley M J N.Brief comments on elastic flexibility of reinforced concrete frames and significance to seismic design[J].Bulletion of the New Zealand Society for Earthquake Engineering,1998,31(4):246―259.
[8]钱稼茹,李耕勤.钢筋混凝土抗震墙墙肢约束边缘构件基于弹塑性层间位移角的设计[J].建筑结构,2002,32(8):3―6.Qian Jiaru,Li Gengqin.Elastic-plastic story drift-based design of boundary element for RC shear wall[J].Building Structures,2002,32(8):3―6.(in Chinese)
[9]周定松,吕西林,蒋欢军.钢筋混凝土框架梁的变形能力及基于性能的抗震设计方法[J].地震工程与工程振动,2005,25(4):60―66.Zhou Dingsong,Lu Xilin,Jiang Huanjun.Deformation capacity and performance-based seismic design method for RC frame beams[J].Earthquake Engineering and Engineering Vibrations,2005,25(4):60―66.(in Chinese)
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[11]GB50011-2001,建筑抗震设计规范[S].北京:中国建筑工业出版社,2001.GB50011-2001,Code for seismic design of building structures[S].Beijing:China Press of Architecture Industrial,2001.(in Chinese)
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