钢筋混凝土剪力墙拉剪承载力分析

完成了3组截面纵筋率分别为1.7%、2.5%和3%，剪跨比为1.5的13片钢筋混凝土剪力墙拉剪性能试验。试验结果表明，剪力墙的抗剪承载力随轴拉力的增加而减小，随截面纵筋率的提高而提高。在拉力和剪力共同作用下，因轴拉力的大小不同，剪力墙出现剪压破坏和滑移破坏两种破坏模式。根据试验结果绘制了破坏模式的分界线并推导了临界点计算公式，公式表明轴拉力越高、纵筋率越低的试件越容易发生滑移破坏。基于理论分析和以往的经验公式，在剪压破坏模式的抗剪承载力公式中增加了暗柱纵筋项。根据试验数据得出，剪压破坏模式下，抗剪承载力公式中的轴拉力和暗柱纵筋的影响系数分别为?0.2和0.04；滑移破坏模式下，轴拉力和截面纵筋影响系数分别为?0.6和0.6。

Analysis of tension-shear capacity of reinforced concrete shear wall

Thirteen specimens of shear wall, with shear span ratio of 1.5 and section longitudinal reinforcement ratio as 1.7%, 2.5% and 3% respectively, were well designed and tested under the low-frequency cyclic static loading. The tests results show that the shear capacity of shear wall may decrease with the increase of tension force and increase with the increase of longitudinal reinforcement ratio. Under the combined action of tension force and shear force, shear wall may fail in the shear-compression mode or in the slip mode depending on the magnitude of tension force. Based on the test results, the boundary line of failure modes was drawn and the formula of critical point was derived. The formula shows that for higher axial force, the specimens with lower longitudinal reinforcement ratio tend to fail in the slip mode. Based on the theoretical analysis and the empirical formula, the term of boundary longitudinal reinforcement was added to the shear capacity formula of shear-compression mode. According to experimental data, the influence coefficients of tension force and boundary longitudinal reinforcement in the shear capacity formula were ?0.2 and 0.04 respectively in the shear-compression failure mode; and the influence coefficients of tension force and section longitudinal reinforcement in the shear capacity formula were ?0.6 and 0.6 respectively in the slip failure mode.