框架节点核心区剪压比超限影响因素及对策  

Influencing Factors and Countermeasures of Shear Compression Ratio Exceeding the Limit in the Core Area of Frame Joints

作　　者：王佐 杨海龙 陈杰 张运良 WANG Zuo;YANG Hailong;CHEN Jie;ZHANG Yunliang(Chongqing Xinhe Construction Engineering Co.,Ltd.Chongqing 401120,China;China Electronic Systems Engineering Second Construction Co.,Ltd.Chongqing 400050,China;Southwest Branch of China Construction Second Engineering Bureau Co.,Ltd.Chongqing 401120,China;Chongqing University Architectural Planning,Design and Research Institute Co.,Ltd.Chongqing 400045,China)

机构地区：[1]重庆新和建筑工程有限公司,重庆401120 [2]中国电子系统工程第二建设有限公司,重庆400050 [3]中国建筑第二工程局有限公司西南分公司,重庆401120 [4]重庆大学建筑规划设计研究总院有限公司,重庆400045

出　　处：《广东土木与建筑》2022年第6期64-67,共4页Guangdong Architecture Civil Engineering

摘　　要：框架节点核心区剪压比一旦超限,就无法通过增大配筋来进一步提高节点核心区的抗剪承载力。对框架节点核心区剪压比超限的影响因素和存在的问题进行了分析,并提出了解决办法。提高框架节点混凝土强度可以改善节点核心区剪压比的超限,但给施工造成不便。增大梁柱的截面可以提高节点核心区剪压比上限,但应注意梁柱刚度增大会造成分担的内力也增大。正交梁的梁端出铰后对节点的侧向约束会减弱,建议复核节点罕遇地震受剪承载力时,ηj不宜取得太大。梁端加腋会干扰塑性铰的出现时间和位置,不宜盲目采用。提出了在框架节点处设置圆柱形柱帽的措施,能够大幅度提高节点抗剪能力,有利于“强节点弱构件”的实现,可以解决复杂框架节点核心区剪压比超限的问题,在实际工程中具有实用性。Once the shear compression ratio of the core area of the frame joint exceeds the limit,it is impossible to further improve the shear capacity of the core area of the joint by increasing the reinforcement. The influencing factors and existing problems of shear compression ratio exceeding the limit in the core area of frame joints are analyzed, and the solutions are put forward. Increasing the concrete strength of frame joints can improve the overrun of shear compression ratio in the core area of joints,but it is inconvenient for construction.Increasing the beam column section can increase the upper limit of shear compression ratio in the core area of the joint,but it should be noted that the increase of beam column stiffness will also increase the shared internal force. After the beam end of the orthogonal beam is hinged,the lateral constraint on the joint will be weakened. It is suggested to recheck the shear capacity of the joint in rare earthquake,ηJ should not achieve too much. Haunching at the beam end will interfere with the occurrence time and position of plastic hinge, which should not be adopted blindly. The measure of setting cylindrical column cap at the frame joint is proposed,which can greatly improve the shear capacity of the joint, is conducive to the realization of “strong joint and weak member”, and can solve the problem of over limit shear compression ratio in the core area of complex frame joint,which is practical in practical engineering.

关 键 词：框架节点 核心区抗剪 梁端加腋 塑性铰 柱帽 

分 类 号：TU375.4[建筑科学—结构工程]