【摘要】 为了研究古木结构中瓜柱柱脚直榫节点的受弯性能,设计了3个不同尺寸的缩尺试件模型.通过单调加载试验,获得了节点的弯矩-转角关系以及最终破坏形态.运用大型有限元分析软件,采用实体单元对节点的受弯性能进行数值模拟.结合试验研究和数值模拟结果,在一定简化假定的基础上建立了节点受弯时的简化力学模型.研究结果表明:瓜柱柱脚直榫节点的主要破坏类型为脱榫破坏;受弯时节点的抵抗力矩主要由柱顶轴压力对转动点来合成;节点的弯矩-转角曲线可以简化为带下降段的双折线模型.更多还原

【Abstract】 Three straight mortise-tenon joints in the base of melon-column were built to study their flexural behavior.The relationships of moment-rotation and failure modes were obtained through monotonic loading tests.The flexural behavior was simulated with finite element software.On the premise of some basic assumptions,the simplified mechanical model was built on the basis of experiments and numerical simulation.Research results show that the main damage type of joints is pulling out,and the resisting torque is mainly synthesized by the vertical load on the top of columns to rotation point.The moment-rotation curve can be simplified as a double broken line model.更多还原