【作者】 闫会春；

【导师】 杨娜；

【作者基本信息】 北京交通大学 ， 结构工程， 2011， 硕士

【摘要】 藏式古建筑的历史意义、宗教意义、艺术价值一直是世人关注的热点。不少藏式建筑建造年代久远,其内部结构已经存在大量的残损现象,对古建筑进行结构性能的评估以采取合理保护措施显得尤为重要,而节点性能的研究是认识结构力学行为的基础和关键。目前,国内外针对藏式建筑的研究主要集中在其建筑风格、装饰艺术及宗教意义方面,对其结构性能的分析较少。本文以典型藏式古建木构梁柱连接为研究对象,对其静力性能进行试验研究和数值模拟,结合试验与数值的结果获得竖向荷载作用下节点的传力机理,建立了梁柱节点弯矩-转角曲线模型,总结了相关因素的影响规律；此外,进行了节点滞回性能的数值模拟,对其动力性能做了初步探究。主要包括以下几方面的内容：首先,在现场勘察的基础上,对藏式古建筑的结构形式进行了阐述,重点介绍了木构架的构造和做法,确定了本文的研究对象,从结构角度出发对研究对象进行荷载和约束的简化,从而建立了对应的分析模型。其次,以分析模型为依据设计了两组静力试验,第一组试验分析梁柱连接在竖向荷载作用下的传力机理及破坏模式,第二组试验分析梁柱连接的转动性能。以静力试验为基础,进行对应的数值模拟,结合试验与有限元分析结果确定了组成节点的各个组件的受力状态,节点的传力机理及破坏模式,并且建立了节点的弯矩-转角曲线模型,分析了弓木长度、暗销位置对于节点转动刚度的影响,及反复荷载作用下节点刚度退化规律。再次,进行梁柱连接滞回性能数值模拟,分析了节点在反复位移荷载作用下的受力状态,建立了滞回曲线,骨架曲线,恢复力模型,并进行刚度退化分析及能量耗散能力分析,将有限元分析结果与已有的汉式古建木构节点的拟动力试验结果进行比较,参照试验结果对恢复力模型进行了修正。图113幅,表22个,参考文献54篇。更多还原

【Abstract】 ABSTRACT: The historical significance, religious significance and artistic value of ancient Tibetan architecture have always been the focuses of world attention. Many Tibetan buildings were built long years ago, so there are already a large number of damaged phenomenon in the internal structure. Under this premise, it is particularly important to analysis structural properties of ancient buildings in order to take reasonable protective measures. And the performance of the joint is the basis and key for understanding mechanical behavior of the whole structure. The recently study is mainly focused on the architectural style, decorative arts and religious meaning. At the same time the study on analysis of the structural performance is few.In this paper, a typical beam-column connection is taken as the research object. Static test and corresponding numerical simulation are carried out to analysis the static properties of the connection. Combining test results and numerical results, moment-rotation curve model of joint is extracted, influence law of related factors and transfer mechanism cf the connection are summed up. In addition, hysteretic behavior is simulated. The main contents include the following aspects:Firstly, based on the on-the-spot investigation structural form of ancient Tibetan architecture is described. Composition and practices of timber frame are focused on and the object of study in this paper is determined. The loading and constraints of structural prototype are simplified to establish corresponding analysis models.Secondly, two groups of static test are carried out based on analysis models. Transfer mechanism and failure modes under vertical load of beam-column connection are analyzed in the first group test. Rotational behavior of the joints is analyzed in the second group test. Taking static tests as the basis, the corresponding numerical simulation is carried out. Combining the results of the two aspects, stress states of composition are explained and M-θmodel is obtained. The effect of Gongmu’s length, dowel’s position to initial rotational stiffness is studied. Stiffness degradation rule under cyclic loading is obtained.Thirdly, hysteretic behavior is simulated. Stress states, hysteretic curve, skeleton curve, restoring force model of joint are obtained. Stiffness degradation rule and energy dissipation are analyzed. The results of numerical simulation are compared with existing pseudo-dynamic test. 113 diagrams,22 charts,54 references更多还原