摘要
区域约束混凝土剪力墙是利用纵筋与箍筋所形成的钢筋笼对局部区域混凝土进行约束而形成的一种剪力墙,本文首先分析区域约束混凝土剪力墙的截面弯矩-曲率变化规进行分析,研究轴压比、混凝土强度等级、纵筋配筋率、配箍特征值对截面的屈服曲率和极限曲率的影响,探讨截面曲率与各因素间的变化关系。然后利用软件对一定数量工况下的模型进行非线性分析,同时在引入约束系数的条件下,对所有工况下产生的结果进行二次回归分析,提出了区域约束混凝土剪力墙截面曲率(屈服曲率和极限曲率)的简要计算公式。并以此为基础通过对剪力墙塑性铰长度的假定,把相关的截面曲率延性计算公式转化为位移延性计算公式,在和试验条件相对应的工况下,通过理论公式计算结果和试验数据的比较分析,探讨了理论公式的准确性。考虑相关因素对截面曲率的影响,为区域约束混凝土剪力墙的抗震延性设计提供依据。
Regionally constrained concrete shear wall is a kind of shear wall formed by using the reinforcement cage formed by longitudinal reinforcement and stirrup to constrain the concrete in the local area, the section bending moment-curvature variation law of this shear wall is analyzed, and the effects of axial compression ratio, concrete strength grade, longitudinal reinforcement ratio, and hoop characteristic value on the yield curvature and ultimate curvature of the section are studied, Discussing the relationship between section curvature and various factors. The software is used to perform nonlinear analysis on the model under a certain number of working conditions, under the condition of introducing the constraint coefficient, the quadratic regression analysis is conducted on the results under all working conditions, and a simple formula for calculating the section curvature(yield curvature and ultimate curvature) of the regionally constrained concrete shear wall is proposed. On this basis, the relevant section curvature ductility calculation formula is transformed into displacement ductility calculation formula by assuming the plastic hinge length of the shear wall, under the working conditions corresponding to the experimental conditions, the accuracy of the theoretical formula is discussed by comparing the calculation results of the theoretical formula with the experimental data.Considering the influence of relevant factors on section curvature, it provides a basis for seismic ductility design of regionally constrained concrete shear walls with regional restraints.
作者
胡利烽
曹新明
汤维多
HU Lifeng;CAO Xinming;TANG Weiduo(Guizhou Architectural Design and Research Institute Co.,Ltd.,Guiyang 550000,China;College of Civil Engineering,Guizhou University,Guiyang 550000,China;Guizhou Traffic Technician and Transportation College,Guiyang 550000,China)
出处
《建筑结构》
CSCD
北大核心
2022年第S02期968-974,共7页
Building Structure
关键词
区域约束混凝土剪力墙
弯矩-曲率
屈服曲率
极限曲率
延性
regional confined concrete shear wall
bending moment-curvature
yield curvature
ultimate curvature
ductilit
