仿古建筑圆钢管柱—工字钢双梁节点性能试验及理论研究

发布时间：2018-02-14 16:18

本文关键词： 仿古建筑圆形钢管柱工字钢双梁异型节点节点核心区抗剪承载力　出处：《西安建筑科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：仿古建筑现在如雨后春笋般矗立在中国的许多地方，因为它不仅满足了人们的审美需求，更是传承了中国的传统文化。由于节点是结构中的关键部位，需要深入研究仿古建筑特殊节点形式的性能及其设计方法，本文是基于古建筑中阑额、由额与柱组成的节点形式为原型进行的研究，采用钢结构制成的特殊节点，并将节点域从上至下依次分为3个核心区：A、B、C。本文主要研究圆钢管柱-工字钢双梁节点的性能以及节点的抗剪承载力，主要的研究内容与成果如下所示： 1.为了研究仿古建筑圆形钢柱-工字钢双梁节点的破坏特征和受力机理，本文设计了4个节点均进行了低周反复加载，并考虑参数轴压比为0.3和0.6的影响。分析了参数对构件性能的影响，研究在低周反复荷载作用下节点的延性、耗能、强度退化和刚度退化规律。由试验结果可得：C核心区出现剪切斜裂缝和严重屈曲导致节点破坏；节点的滞回曲线相对饱满，延性系数介于2.30~3.16之间，强度、刚度随着位移加载级数退化稳定，节点耗能的等效粘滞阻尼系数介于0.19~0.31之间。 2.通过试验的结果可得节点的荷载-位移滞回曲线及骨架曲线，确定其相应的特征点并建立计算模型，依据节点的受力特性以及破坏机理提出节点的抗剪承载力公式，由力学公式推导出圆形钢管截面的正应力和剪应力，，参照第四强度理论求得钢管壁的折算应力，依此求得钢管截面处的最大剪应力。参照抗震规范对节点域剪应力进行的系数修正，并考虑轴压比对构件的影响得出相应的节点抗剪承载力公式。
[Abstract]:Antiquated buildings are now springing up in many parts of China, because they not only satisfy people's aesthetic needs, but also inherit Chinese traditional culture. It is necessary to deeply study the performance and design method of the special joint form of the ancient building. This paper is based on the research of the diaphragm in the ancient building, which is based on the prototype of the joint form composed of the forehead and the column, and adopts the special joint made of the steel structure. The joint domain is divided into three core regions in turn: 1. The paper mainly studies the properties of round steel tube-I-beam joints and the shear bearing capacity of joints. The main research contents and results are as follows:. 1. In order to study the failure characteristics and mechanical mechanism of circular steel column-I-beam joints in archaic buildings, four joints are designed for repeated low-cycle loading. Considering the influence of the axial compression ratio of 0.3 and 0.6, the effect of parameters on the performance of the members is analyzed, and the ductility and energy dissipation of the joints under low cyclic cyclic loading are studied. According to the experimental results, shear slanting cracks and severe buckling in the core area of W C lead to the joint failure, the hysteretic curve of the joints is relatively full, and the ductility coefficient is between 2.30 and 3.16. The stiffness degenerates steadily with the displacement loading, and the equivalent viscous damping coefficient of the node energy dissipation is between 0.19 and 0.31. 2. The load-displacement hysteretic curve and skeleton curve can be obtained from the test results, the corresponding characteristic points are determined and the calculation model is established. According to the stress characteristics of the joints and the failure mechanism, the shear bearing capacity formula of the joints is proposed. The normal stress and shear stress of circular steel tube section are derived from the mechanical formula, and the converted stress of steel tube wall is obtained by referring to the 4th strength theory. According to this, the maximum shear stress at the section of the steel pipe is obtained, the coefficient of shear stress in the joint region is modified by referring to the seismic code, and the corresponding formula of the shear bearing capacity of the joint is obtained considering the influence of the axial compression ratio on the members.
【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】：TU391

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