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该文依据16组框架柱双梁式托换节点的正交试验,得到了行走梁的跨高比、托换梁的箍筋配箍率、纵筋配筋率等因素对框架柱托换节点承载力的影响关系,通过对试验结果的分析,总结出框架柱托换节点的受力机理、破坏形态,并得出行走梁的跨高比是影响框架柱托换节点破坏形式的关键因素;并在此基础上通过理论分析将框架柱托换节点的界面破坏过程分为界面冲切滑动前和界面冲切滑动后两个阶段,针对界面冲切滑动前这一阶段提出了框架柱托换节点的空间“拉杆拱”力学模型,并对这一空间模型进行了受力分析,推导出了框架柱托换节点承载力的理论计算公式,并将理论结果与试验结果进行了对比,二者吻合较好。
Based on the orthogonal test of 16 double girder underpinning columns with frame columns, the factors such as the span-to-height ratio of walking girder, the stirrup ratio of support hoisting beams and the reinforcement ratio of longitudinal reinforcement were obtained. Through the analysis of the test results, the stress mechanism and failure mode of the underpinning joint of frame column are summed up, and the span-height ratio of the walking beam is the key factor that affects the underpinning of the frame underpinning node. Based on this, the failure process of the interface of the frame underpinning node is divided into two stages, that is, before the interface is cut and slided and after the interface is punched and slided, and the frame column underpinning Node space “rod arch ” mechanics model, and the force model analysis of the space, deduced the theoretical calculation formula of the bearing capacity of the frame underpinning node, and the theoretical results and the experimental results were compared, The two agree well.