对混凝土剪力墙静态破碎效果的试验研究

为考察成孔方式、剪力墙厚度等对混凝土剪力墙静态破碎效果的影响,开展了9片混凝土剪力墙试件的静态破碎试验。采用倾斜向下斜交于墙片侧面打孔、注入静态破碎剂进行破碎和竖直向下垂直于墙片顶面打孔、注入静态破碎剂进行破碎这两种破碎方案。为提高破碎效果,在墙片侧面打孔后用锯片切断钻孔侧的竖向分布钢筋,在墙片顶面打孔后用锯片切断两侧的水平分布钢筋。试验结果表明:采用这两种破碎方案,破碎后产生的块体短边尺寸为孔间距或者孔边距;倾斜向下斜交于墙片侧面打孔并注入静态破碎剂后,试件的割缝平均宽度随墙片厚度的增加逐渐增大;竖直向下垂直于墙片顶面打孔并注入静态破碎剂后,试件的割缝平均宽度与墙厚无关;破碎效果的先后顺序为:竖直向下垂直于墙片顶面打孔并切断两侧水平分布钢筋竖直向下垂直于墙片顶面打孔不切断钢筋倾斜向下斜交于墙片侧面打孔并切断钻孔侧竖向分布钢筋。

Experimental study on static crushing effect of concrete shear walls

To investigate the influence of hole forming methods and the thickness of shear wall on the static crushing effect of concrete shear walls, static crushing tests of nine concrete shear wall specimens were carried out. Two crushing methods were adopted: one is drilling holes on the side of the wall obliquely downwards and injecting static crushing agent for crushing, and the other is drilling holes perpendicular to the top surface of the wall and injecting static crushing agent for crushing. In order to improve the crushing effect, the vertically distributed steel bars on the side of the wall were cut off with a saw blade after drilling on the side of the wall, and the horizontally distributed steel bars on both sides of the wall were cut off with the saw blade after drilling on the top of the wall. Test results show that with these two crushing schemes, the short side size of the block produced after crushing was the hole spacing or hole edge spacing. After injecting static crushing agent, with the increment of the wall thickness, the average width of the slits of the specimens drilled obliquely on the side increased, while for the specimens drilled vertically on the top surface, the average width of the slits had no obvious correlation with the wall thickness. The order of the crushing effect was: drilling holes on the top of the wall vertically and cutting off the horizontally distributed steel bars> drilling holes on the top of the wall without cutting the steel bars> drilling holes on the side of the wall obliquely downwards and cutting off the vertically distributed steel bars.