摘要
对沿连梁截面高度配置3层封闭约束箍筋的9个小跨高比连梁进行了抗震性能试验,研究了连梁的跨高比、箍筋和纵筋数量对其破坏形态、滞回性能、刚度退化、变形和耗能性能等的影响。研究结果表明:对于跨高比为0.75―1.5的连梁,无论受力纵筋是否屈服,最终还是发生剪切破坏或弯曲剪切破坏;沿连梁截面高度配置的3层封闭约束箍筋有效地改善了连梁的变形和耗能能力。根据试验结果,建立了考虑纵向受力钢筋作用的连梁受剪承载力计算公式,公式的预测值与试验值吻合较好。
Seismic behaviors of 9 coupling beam specimens were investigated experimentally. Effects of span-to-depth, amount of stirrups and longitudinal bars of coupling beam on its failure mode are studied, as well as the hysteretic behavior, stiffness degradation, deformation and energy dissipation capacity. Coupling beams with span-to-depth of 0.75-- 1.5 were observed to suffer shear failure or flexural-shear failure, no matter whether longitudinal reinforcements yield or not. The existing of stirrups along the height of the beam effectively improved its deformation and energy dissipation capacity. According to test results, the formulae for estimating shear strength of the coupling beam were suggested considering the effect of longitudinal reinforcements. Estimated shear strength of coupling beams agreed well with the experimental data.
出处
《工程力学》
EI
CSCD
北大核心
2009年第12期119-126,共8页
Engineering Mechanics
基金
国家自然科学基金项目(50678146)
关键词
小跨高比连梁/新配筋方案
拟静力试验
抗震性能
破坏形态
变形和耗能性能
coupling beam with small span-to-depth/new reinforcement scheme
pseudo static test
seismic performance
failure mode
deformation and energy dissipation capacity
