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新配筋方案小跨高比连梁受剪承载力计算
李方圆,梁兴文,张涛
摘 要

(西安建筑科技大学结构工程与抗震教育部重点实验室,西安 710055)
[摘要]联肢剪力墙中的洞口连梁一般为小跨高比连梁,这种连梁的受剪承载力计算目前尚未很好解决。根据9个沿梁截面高度布置三层封闭箍筋连梁的试验结果,分析了影响连梁破坏形态、位移延性系数和耗能比的因素。研究了连梁跨高比、截面尺寸、材料强度、箍筋数量和纵向钢筋数量对其受剪承载力的影响。在此基础上,通过多元回归分析,建立了新配筋方案小跨高比连梁受剪承载力计算公式,提出了相应的剪压比限值。受剪承载力公式的预测值与试验值吻合良好。
[关键词]小跨高比连梁;新配筋方案;受剪承载力;剪压比限值
Calculation of shear capacity of new reinforcement scheme deep coupling beams
Li Fangyuan, Liang Xingwen, Zhang Tao(Xi′an University of Architecture and Technology, Key Lab of Structural Engineering and\=Earthquake Resistance, Ministry of Education, Xi′an 710055, China)
Abstract:Coupling beams in coupled shear walls are generally with small span-to-depth,and the shear capacity calculation method of which is not yet achieved suitably. Based on the results of 9 coupling beam specimens in which the stirrup was divided into three rings along the depth of the beam, primary factors affecting failure mode,displacement ductility coefficient and energy-dissipation ratio of coupling beam were analyzed; and span-to-depth,section size,material strength,amounts of stirrups and longitudinal reinforcement which affecting shear capacity of coupling beams were studied. On this basis, through multiple regression analysis,shear capacity formulae,upper limit of shear compression ratio were established for the new reinforcement scheme deep coupling beam. Predictive values of shear capacity of coupling beams agree well with the experimental data.
Keywords:coupling beam with small span-to-depth; new reinforcement scheme; shear capacity; shear compression ratio limit
国家自然科学基金资助项目(50678146)。
作者简介:李方圆,博士研究生,副教授,Email:fangyuanli@yahoo.cn。
参考文献
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