装配整体式双向孔空心模板剪力墙受剪性能试验研究

EXPERIMENTAL STUDY ON SHEAR BEHAVIORS OF ASSEMBLED MONOLITHIC CONCRETE SHEAR WALLS BUILT WITH PRECAST TWO-WAY HOLLOW SLABS

研究了一种新型装配整体式住宅产业化结构构件,即装配整体式双向孔空心模板剪力墙的受剪性能。通过1个钢筋混凝土剪力墙和5个装配整体式双向孔空心模板剪力墙的拟静力试验,研究了其破坏模式和破坏过程,分析了内部接缝、轴压比、剪跨比、水平分布钢筋等参数对其受剪性能的影响。研究表明:装配整体式双向孔空心模板剪力墙的破坏过程和破坏模式与钢筋混凝土剪力墙不同,在水平荷载作用下沿内部接缝出现宏观竖向裂缝,经历整截面墙受力到分缝剪力墙受力的过程,避免了剪切破坏,具有良好的变形能力,但是受剪承载力降低;提高剪跨比,墙体承载力降低,承载力稳定性和变形能力提高;增加轴压比提高墙体的受剪承载力和抗侧刚度;提高水平钢筋配筋率提高墙体的受剪承载力和变形能力。

An innovated precast concrete shear wall is presented, assembled monolithic concrete shear walls built with precast two-way hollow slabs. Five new type shear walls and one reinforced concrete shear wall are tested quasi-statically under low cyclic lateral loads for shear performance to acquire their shear failure process and modes. The effects of the inner joint, of the shear-span ratio, of the axial load, and of the amount of the web horizontal reinforcement are investigated. The study proves that the new type shear walls have the adequate deformability, in terms of their failure characteristic and behaviors, which is different to the one of RC walls and develops from integral wall to slit wall for appearing the vertical cracks along he inner joints. As the results, the brittle shear failure is extinct. The test results show that the shear capacity reduces with the increase of shear span ratios, and rise with the increase of the amount of web horizontal reinforcements, the axial load. It can be found that the stiffness is improved with the increment of the axial compression ratio, and the stable load capacity and deformability can be acquired by increasing the shear span ratio.