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按现行施工规范规定,在有抗震要求的结构中,箍筋弯钩的形式应符合设计要求。当设计无具体要求时,角度应为135°,其平直部分长度不小于箍筋直径的10倍。这样,当连续梁支座处有2或3层负弯矩钢筋时,就会出现弯钩平直部分与第2层负弯矩筋相碰的情况(图1)。
According to the current construction code, in the structure with seismic requirements, the form of stirrup hook should meet the design requirements. When no specific requirements of the design, the angle should be 135 °, the straight part of the length of not less than 10 times the diameter of the stirrups. In this way, when there are 2 or 3 layers of negative moment reinforcement at the continuous beam support, the flat part of the hook will collide with the negative layer 2 of the second layer (Figure 1).