木结构燕尾榫节点应力分析研究

以古建筑中燕尾榫节点为研究对象,依照《营造法式》“材分制”标准,设计三个不同模型比例的二等材燕尾榫节点和一个三等材燕尾榫节点,基于ABAQUS对其进行单调加载与低周循环加载模拟试验,得到燕尾榫节点的拔榫量转角关系与应力状态。试验结果表明:节点模型比例越大拔榫量越大,且同模型比例下二等材较三等材拔榫量更大;模拟中榫头顺纹方向、剪应力均未超过应力极限,而横纹径向除节点YS-3外均达到屈服,进入弱强化段;榫头等效塑性应变(PEEQ)值呈线性增长,在榫头端部的PEEQ值最小,榫颈处PEEQ值达到最大。

Research on Stress Analysis of Dovetail Joints of Timber Building

Taking the dovetail joints in ancient buildings as the research object,three second-grade timber dovetail joints and one third-grade timber dovetail joint were designed according to the"Timber System"the standard in"Building Method".The monotonic loading and low-cycle cyclic loading simulation tests were carried out based on ABAQUS,and the relationship between the angle and the dovetail joint's tenon pulling amount,and the corresponding stress state were obtained.The results showed that the larger the proportion of the joint model was,the more the dovetail joint's tenon pulling amount.Generally,the dovetail joint's tenon pulling amount of the second-grade timber was larger than the third-grade timber under the same proportion of the joint model.In the simulated test,both the stress following grain direction and shear stress did not exceed the limit.All joints model reached yield state and enters the weakened section except YS-3.The PEEQ value increased linearly,and reached the minimum and maximum at the end and neck respectively.