古建筑木结构燕尾榫节点抗震性能研究

发布时间：2018-04-10 15:08

本文选题：古建筑木结构 + 燕尾榫节点　；参考：《西安建筑科技大学》2015年硕士论文

【摘要】：古建筑是不可再生的珍贵文化资源,对其进行保护具有重要意义。我国古建筑以木结构为主,木结构构件间通常采用榫卯连接,无需一钉一铁,榫卯连接是我国古建筑木结构的主要特色之一。在地震作用下,榫卯间的挤压摩擦对木结构有良好的消能减震作用,而榫卯节点的破坏通常会导致结构倾斜甚至倒塌。因此,掌握榫卯节点的抗震性能对古建筑木结构的抗震评估和修缮加固具有重要意义。本文以木结构中应用较广泛的燕尾榫为研究对象,通过模型试验、理论分析和数值模拟,对其独特的传力机理和抗震性能进行了研究,主要内容包括:(1)总结了常见的榫卯形式,对具有代表性的直榫和燕尾榫的传力机理和常见破坏形式进行了分析;结合现存古建筑木结构榫卯节点在地震下的实际表现,说明了对其抗震性能进行研究的必要性和重要性。(2)为研究燕尾榫节点的抗震性能,考虑竖向荷载、普柏枋、雀替及尺寸效应的影响,对7个按照宋《营造法式》制作的燕尾榫单节点模型进行水平低周反复加载试验,对比分析了节点的破坏形式、滞回特性、转动弯矩、刚度退化和耗能等抗震性能及其随各影响影响因素变化的规律。(3)为研究残损对燕尾榫节点抗震性能的影响,人工模拟了节点两种常见的残损状态—真菌腐朽和虫蛀,通过低周反复加载试验对残损节点的破坏特征、弯矩-转角滞回曲线和骨架曲线、耗能进行了研究,分析了残损燕尾榫节点抗震性能的退化规律。(4)通过对燕尾榫节点受力机理的分析,基于力学平衡和几何关系对节点的弯矩-转角关系进行了理论推导,结合拟静力试验结果,提出了以屈服点、极限点为特征点的弯矩—转角双折线模型,模型计算结果与试验结果吻合良好。最后在计算公式的基础上,对燕尾榫节点转动弯矩的影响参数进行了分析。(5)基于ABAQUS对前述三种不同类型的燕尾榫节点进行有限元分析,从节点在低周反复荷载作用下的变形、应力分布及骨架曲线三个方面验证了榫卯连接的传力机理和破坏形态。结果表明,建立的有限元模型可以较好地反映古建筑木结构燕尾榫节点的抗震性能。
[Abstract]:Ancient buildings are precious cultural and non renewable resources, the protection is of great significance to China's ancient architecture. The main wooden structure, wooden structure components usually adopts the mortise and tenon connection, without a single nail, mortise and tenon connection is one of the main features of Chinese ancient wooden building. In the earthquake the tenon, extrusion and friction energy dissipation has good effect on wood structure, and tenon joints usually leads to structure damage and even collapses. Therefore, mastering the seismic performance of mortise tenon joint seismic assessment and restoration of ancient timber structure reinforcement is of great significance. This paper is widely used in wood structure the dovetail joint as the research object, through the model experiment, theoretical analysis and numerical simulation, the unique stress transmission mechanism and seismic performance are studied, the main contents include: (1) summarizes the common form of straight mortise tenon, representative The load transfer mechanism and dovetail and common failure forms are analyzed; the actual performance with the existing ancient timber structure tenon joints under earthquake and illustrates the necessity and importance of the research on its seismic performance. (2) to study on the seismic behavior of dovetail joints, considering vertical load, Pu Bo Fang, the sparrow effect and size effect, of 7 in accordance with the song < create a dovetail single node model produced by the French > low cyclic loading test, comparison and analysis of the failure node, hysteretic characteristics, rotation moment, change the seismic performance of stiffness degradation and energy dissipation and with various factors the law. (3) in order to study the effect of damage on the seismic performance of dovetail joints, artificial simulated nodes two state - common damage and decay fungi and insects, the failure characteristics of cyclic loading tests on the damaged nodes, moment transfer Angle hysteretic curves and skeleton curves, energy dissipation is studied, analyzed the degradation of damaged dovetail seismic performance. (4) through the analysis of the stress mechanism of dovetail joints, mechanical equilibrium and geometric relation between moment of joint angle based on the theory, combined with the pseudo static test results, put forward the yield point, limit point angle double line moment feature model, the calculated results agree well with the experimental results. Finally, based on the calculation formula on the parameters affecting the rotation moment of the dovetail joint are analyzed. (5) ABAQUS finite element analysis is carried out on the three different types of dovetail nodes based on node from deformation under cyclic loading, the stress distribution of three aspects should be verified and the skeleton curves of load transfer mechanism and failure form of mortise tenon joints. The results show that the finite element modeling of the The model can better reflect the seismic performance of the dovetail joint of the ancient building wood structure.

【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】：2015
【分类号】：TU352.11;TU366.2

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