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通过18组开孔波折板连接件的静载推出试验,研究了连接件的荷载滑移性能、应变(应力)发展规律和破坏机理,探讨了混凝土强度等级、开孔直径、贯穿钢筋直径及数量、波高、波折角度、开孔个数、双板间距等因素对开孔波折板连接件承载力和抗剪刚度的影响。结果表明,各组试件具有相似的滑移趋势,设置贯穿钢筋的连接件表现出塑性破坏特征;开孔波折板波折面受到较大的混凝土局压作用,焊接边钢板应力大于自由边钢板应力,贯穿钢筋应变随连接件波高的增加而减小;提高混凝土等级、增大开孔直径、增大贯穿钢筋面积和数量、增大波高等措施可提高开孔波折板连接件的受剪承载力,改变波折角度对连接件的受剪承载力影响较小;随着混凝土强度等级、贯穿钢筋面积及波高的增加,试件抗剪刚度也随之增大,而其他因素的改变对抗剪刚度无明显的影响;提出了开孔波折板连接件受剪承载力的计算公式,计算结果能较好地吻合试验值。
Through the static load test of 18 sets of perforated bent plate connectors, the load slipping performance, strain (stress) development and failure mechanism of the connectors were studied. The concrete strength, the diameter of the perforated hole, , Wave height, wave angle, the number of holes, the distance between the two plates and other factors on the bearing capacity and shear stiffness of corrugated plate connectors. The results show that the specimens have similar slip tendency, and the connectors which penetrate the reinforcing bars show the characteristics of plastic failure. The corrugated surface of the open-faced corrugated plates is subjected to the local pressure of the concrete. The stress of the welded edges is greater than that of the free edge , And the strain of the through rebars decreases with the increase of the wave height of the connectors. Increasing the concrete grade, increasing the diameter of the holes, increasing the area and number of the through rebars, increasing the wave height can improve the shear bearing capacity of the perforated plate- With the increase of the area of reinforcement and the increase of the wave height, the shear stiffness of the specimen increases with the increase of the strength of concrete, and the change of other factors has no effect on the shear stiffness The calculation formula of the shear bearing capacity of perforated plate bent plate joints is put forward. The calculation results are in good agreement with the experimental values.