带端柱高强混凝土剪力墙抗震性能试验研究  

Experimental studies on seismic behavior of high strength concrete shear wall with boundary columns

作　　者：梁兴文[1] 杨鹏辉[1] 崔晓玲[1] 邓明科[1] 张兴虎[1] 

机构地区：[1]西安建筑科技大学结构工程与抗震教育部重点实验室,陕西西安710055

出　　处：《建筑结构学报》2010年第1期23-32,共10页Journal of Building Structures

基　　金：国家自然科学基金项目(50678146);高等学校博士学科点专项科研基金项目(20070703002)

摘　　要：按性能设计理论,在剪力墙两端设置端柱,并在构件的塑性铰区采用分段约束高强箍筋,设计了6个带端柱高强混凝土剪力墙试件,进行了拟静力试验,对其破坏形态、滞回特性、变形能力、刚度退化、耗能能力、截面应变等进行了研究。根据试验结果,给出了6个试件在使用良好、生命安全和防止倒塌3个性能水平对应的位移角分布范围和平均值;分析了轴压比、剪跨比、约束箍筋数量及范围等因素,对剪力墙的延性、耗能能力和破坏形态的影响。研究结果表明,端柱可以对剪力墙提供有效约束,提高剪力墙的变形能力和耗能能力;设置端柱并根据轴压比和位移延性需求确定的分段约束箍筋数量及范围,可以明显改善高强混凝土剪力墙的脆性,使高强混凝土剪力墙的延性指标达到设计要求;3个性能水平对应的位移角与构件的损伤程度有较好的相关性,可以用作这种构件的性能指标。According to performance-based seismic design concept, six high-strength concrete shear wall models with boundary columns reinforced with several high-strength rings like a chain in the potential plastic hinge regions were designed and the quasi-static tests were carried out. Seismic behavior such as failure pattern, hysteretic characteristics, displacement ductility, rigidity degeneration, energy dissipation and section strain etc were investigated. Based on the experimental results, the mean value and distribution of the drift ratio of the six models for three performance levels, namely serviceability, life-safety and collapse protection, are presented. The influences of the axial load ratio, the shear span ratio, the amount and range of high-strength hoops on the ductility, energy dissipation capacity and failure pattern were analyzed. The study shows that boundary columns can provide confinement to the wall panel effectively, resulting in the deformation and energy dissipation capacity improvement. Setting boundary columns with high-strength hoops based on axial load ratio and the displacement ductility demand is demonstrated to be valid to assure the ductility level of the high-strength concrete shear wall meeting the design requirements. It is also shown that drift ratio, which is closely correlative with the damage levels of members, can be used as the performance index of the members.

关 键 词：高强混凝土 剪力墙 端柱 分段约束箍筋 拟静力试验 性能指标 

分 类 号：TU398.2[建筑科学—结构工程] TU317.1