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.
出处
《工程力学》
EI
CSCD
北大核心
2010年第A01期177-183,共7页
Engineering Mechanics
基金
国家自然科学基金项目(50908187)
陕西省自然科学基金项目(2009JQ7013)
陕西省教育厅专项科研计划项目(09JK514)
西安建筑科技大学基础研究基金项目(JC0902)
关键词
剪力墙
曲率延性
屈服曲率
极限曲率
分段约束箍筋
shear wall
curvature ductility
yield curvature
ultimate curvature
piecewise confining stirrup
