古建筑木结构直榫节点抗震性能研究

发布时间：2018-09-19 08:45

【摘要】：古建筑记载了我国几千年建筑风格的变化与发展，具有重要的文化、历史和社会价值。榫卯连接是我国古建筑木结构的重要特色，具有良好的耗能性能，，榫卯节点的破坏通常会导致整体结构倾斜甚至倒塌，因此掌握榫卯节点的各项性能是古建筑木结构修缮保护的基础。首先，本文以直榫节点为研究对象(单向直榫节点、透榫节点及半榫节点)，通过单调或低周反复加载试验，对其抗震性能进行了研究。结果发现，单向直榫节点的抗弯承载力和抗弯刚度与透榫节点相差不多，但其耗能能力却低于透榫节点，半榫节点抗震性能相对较差；增大模型比例和增加榫头长度，都能明显提高单向直榫节点的抗弯承载力和抗弯刚度，且节点抗弯承载力与模型比例的平方成正比，但耗能能力随着模型比例的增加而减小；不同的木材种类对节点的抗震性能有较大的影响。然后，本文采用人工模拟节点残损的方法，考虑不同残损类型、不同残损程度的影响，通过7个残损单向直榫节点的低周反复荷载试验，得到了节点的破坏特征、弯矩-转角滞回曲线、骨架曲线、刚度退化规律和耗能等性能。结果发现，残损节点的转动承载力、刚度和耗能能力明显低于完好节点，且随着残损程度增加逐渐降低；相同残损程度的人工模拟真菌腐朽的节点的最终承载力和刚度要大于人工模拟虫蛀节点，但其耗能能力却低于人工模拟虫蛀节点。最后，运用基于力学平衡条件和变形协调条件的理论分析方法得到了直榫节点弯矩-转角关系。理论分析结果与试验结果基本吻合。
[Abstract]:Ancient architecture records the change and development of architectural style in China for thousands of years, which has important cultural, historical and social value. Tenon joint is an important feature of wood structure in ancient buildings of our country, and it has good energy dissipation performance. The damage of tenon joint usually leads to the whole structure tilting or even collapsing. Therefore, mastering the properties of tenon joint is the foundation of repair and protection of ancient building wood structure. Firstly, the seismic behavior of direct-tenon joint (unidirectional direct tenon joint, tenon joint and semi-tenon joint) is studied by monotonic or low-cycle repeated loading tests. The results show that the flexural bearing capacity and flexural stiffness of unidirectional tenon joints are not much different from those of tenon joints, but their energy dissipation capacity is lower than that of tenon joints, and the seismic performance of semi-tenon joints is relatively poor, and the model ratio and mortise length are increased. The flexural bearing capacity and bending stiffness of unidirectional direct tenon joints can be improved obviously, and the bending capacity of joints is proportional to the square of the model ratio, but the energy dissipation capacity decreases with the increase of the model ratio. Different types of wood have great influence on the seismic performance of joints. Then, by using the method of artificial simulation of joint damage, considering the influence of different damage types and different damage degree, through the low-cycle repeated load test of seven damaged unidirectional straight tenon joints, the failure characteristics of the joints are obtained. Bending moment-angle hysteretic curve, skeleton curve, stiffness degradation law and energy dissipation. The results show that the rotational bearing capacity, stiffness and energy dissipation capacity of the damaged joints are obviously lower than those of the intact joints, and decrease gradually with the increase of the damage degree. The ultimate bearing capacity and stiffness of artificial simulated fungus decayed nodes with the same degree of damage are larger than those of artificial simulated worm-eaten nodes, but their energy dissipation capacity is lower than that of artificial simulated worm-eaten nodes. Finally, the relationship between moment and angle of tenon joint is obtained by using the theoretical analysis method based on mechanical equilibrium condition and deformation coordination condition. The theoretical analysis results are in good agreement with the experimental results.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU366.2;TU352.11

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