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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。
Joint beam shear wall in the hole with the beam is generally a small span ratio beam, the beam shear strength calculation is not yet a good solution. According to the test results of nine beams with three closed confining beams along the height of the cross section of the beam, the factors influencing the failure mode, displacement ductility coefficient and energy dissipation ratio of the beam are analyzed. The effect of span-height ratio, section size, material strength, the number of stirrups and the number of longitudinal reinforcement on the shear capacity of the beam was studied. On this basis, through multiple regression analysis, the formula of shear bearing capacity of small span-to-height ratio beams with new reinforcement scheme is established, and the corresponding shear pressure ratio limits are proposed. The predicted value of shear capacity formula is in good agreement with the experimental value.