无砂浆配筋砌体剪力墙抗震试验的滑移研究

Study on slide phenomenon of motarless reinforced masonry shear walls seismic experiment

滑移现象的出现对试验试件的破坏情况、滞回曲线、骨架曲线、刚度退化曲线和极限承载力都有一定的影响,造成试件破坏不充分、滞回曲线出现Z形滞回环和试件较早滑移破坏等现象,对试验结果不利。对3片无砂浆配筋砌块砌体剪力墙进行低周反复水平加载试验,研究轴压比和剪跨比等因素对滑移现象的影响。研究结果表明:轴压小的试件受到滑移现象的影响程度较高,而轴压大的试件不易出现滑移;在试验墙体高度不变的情况下,剪跨比小的试件因为截面高度增加,试验墙体刚度增大,所以更容易出现滑移破坏。

Slide phenomenon exerts certain influences on failure mode, hysteresis curve, skeleton curve, stiffness degradation curve and measured strength of specimens. It will lead to the insufficient failure of specimen, the emergence of Z-shape hysteresis loop in hysteresis curve and the premature sliding failure, which are adverse to test results. In this paper, three specimens of mortarless reinforced masonry shear walls were tested under cyclic load to study the influences of axial compression and aspect ratio on the slide phenomenon. Experimental results show that slide phenomenon affects specimens of low axial compression more than specimens of high axial compression, and specimens of high axial compression are not easy to slide. Under the condition of invariable wall height, specimens of low aspect ratio are more likely to slide due to the increase of its cross-section height and stiffness.