带栓钉钢板与外包混凝土剪力墙共同工作性能研究

Performance of Co-work Between Steel Plate With Studs and Outer Reinforced Concrete in Shear Wall

为研究带栓钉抗剪键钢板在混凝土剪力墙中的锚固性能,进行了18个配置列阵栓钉抗剪键的内藏钢板混凝土墙板试件在单调连续加载下的推出钢板试验研究.试件设计中考虑了栓钉的直径、长度和数量,混凝土墙体厚度,钢板厚度,墙体分布钢筋配筋率等参数.在试验基础上,分析了钢板与外包混凝土之间的抗剪切极限荷载和滑移、钢板及栓钉应变、试件破坏形态等,研究了此类墙板的受力特点与破坏模式以及栓钉配置方式对墙板协调工作性能的影响.试验研究表明:在栓钉抗剪键面积一定的情况下,采用较小直径栓钉并加密栓钉的列阵布置可明显提高墙体的抗剪切承载力,在一定条件下钢板厚度的变化对承载力影响较小,内藏钢板剪力墙墙板应满足一定的厚度要求,栓钉的栓杆长径比λ应大于等于4.提出了适于内藏钢板混凝土剪力墙体设置列阵栓钉抗剪键的抗剪切承载力简化计算方法.

Eighteen specimens of embedded steel plate concrete shear walls with arrayed studs were tested by pushing out under monotonic loading in this paper. Some parameters, such as the diameter, the length, and the amount of studs, the thickness of the concrete wall, the thickness of steel plate and the rate of reinforcement for distributing bars in the walls are considered. The shear bearing capacity, load- slip relationship, strains of the steel plate and studs, and development of concrete cracks are analyzed. The mechanical properties, failure modes, and the effect of stud layout on the coordinate work of the concrete plate are studied. Experimental study shows that the shear bearing capacity is obviously improved by using smaller diameter studs, decreasing the distance between studs when the total area of studs does not change. The thickness of the concrete wall should be thick enough to meet the basic requirements. However, the variance of the steel plate thickness has almost no effect on the shear bearing capacity. The ratio of the length to the diameter of the studs should be not less than four. A simplified mechanics computing method to estimate the shear bearing capacity of this kind of shear wall is put forward.