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基于以往试验研究提出了针对钢筋混凝土框架顶层边节点的受力模型。研究结果表明:框架顶层边节点强度不但受抗剪机构而且受抗弯机构及锚固机构的影响;正弯矩方向的受力模型与负弯矩方向受力模型不同;负弯矩方向梁筋锚固强度是由其上层筋的弯起段长度、混凝土强度及钢筋直径决定的;正弯矩方向节点抗弯强度是由梁柱筋屈服强度、节点箍筋、柱中间筋和梁柱纵筋在节点内的投影长度决定的。利用该研究受力模型得出的节点强度计算结果与试验结果吻合。
Based on the previous experimental research, a stress model is proposed for the edge node of RC frame. The results show that the strength of the edge node at the top of the frame is affected not only by the shear mechanism but also by the bending mechanism and the anchoring mechanism. The stress model in the positive bending moment direction is different from the stress model in the negative bending moment direction. The strength is determined by the length of the bending section of the upper tendons, the strength of the concrete and the diameter of the reinforcing bar. The flexural strength of the joints in the direction of positive bending moment is determined by the yield strength of the beams and stiffeners, Projection length of the decision. The calculation results of node strength obtained by using the research stress model are in good agreement with the experimental results.