SRC柱—钢梁及SRC柱—组合梁节点抗震性能试验研究

发布时间：2018-06-25 18:43

本文选题：SRC柱 + 组合节点　；参考：《郑州大学》2017年硕士论文

【摘要】：20世纪90年代分别发生在美国加州北岭和日本神户两次较大规模的地震中,许多钢结构建筑物产生严重破坏,其中梁柱节点引起的破坏是其中一个重要原因。由此可见,梁柱节点的设计和安全至关重要,有必要深入研究钢-混凝土组合节点的抗震性能及设计理论。本文主要研究SRC柱-钢梁及SRC柱-组合梁框架节点的力学及抗震性能,论文的工作如下:(1)开展了3个1/2比例缩尺的钢-混凝土组合框架中柱节点(其中包括1个SRC柱-钢梁组合节点和2个SRC柱-组合梁组合节点)的低周反复加载试验,主要研究该类节点的抗震性能,参数变量为有无楼板和楼板宽度大小,采取梁两端反对称加载方式,分析总结本课题节点的破坏形态、刚度及强度退化规律、滞回特性、承载力、位移延性和某些关键部位应变变化等力学性能。结果表明:虽然3个节点试件的核心区最后都发生了严重的剪切破坏,节点的承载力仍然保持较高,具有良好的延性和耗能特性,说明其抗震性能良好。与试件SRC1相比,SRC2和SRC3的承载力提高了很大程度,其位移延性也较好,耗能能力更强等。(2)采用试验中节点构件实际尺寸作为模型,采用数值模拟软件ABAQUS对组合节点进行实体建模和网格划分,根据试验现场客观条件,合理地选择模拟边界条件和定义荷载施加方式,对节点进行单一推覆和循环加载的有限元分析。主要分析了SRC框架中柱节点现浇楼板的组合效应对其受力性能的影响,分析比较试验结果和数值模拟计算数据,发现两者差值在一定范围内,整体吻合较好。而且通过数值模拟能够得到很多试验中不易测量的一些关键部位受力情况,例如核心区SRC柱钢骨翼缘及腹板应力分布变化、核心区加劲肋应力分布变化及钢筋混凝土楼板的应力分布和受拉受压损伤发展等。对组合节点进行变参数分析,以试件SRC2为例,探讨了现浇楼板厚度及其纵筋配筋率和混凝土强度对节点力学性能的影响。将变参数分析的结果进行对比,给出一些关于抗震方面的建议。
[Abstract]:In the 1990s, two large-scale earthquakes occurred in the Northern Ridge of California and Kobe, Japan, in which many steel structures were seriously damaged, among which the damage caused by Liang Zhu joints was one of the important reasons. Therefore, the design and safety of Liang Zhu joints are very important. It is necessary to study the seismic behavior and design theory of steel-concrete composite joints. This paper mainly studies the mechanical and seismic behavior of SRC column-steel beam and SRC column-composite beam frame joint. The work of this paper is as follows: (1) the low cycle repeated loading tests of three steel / concrete composite frame joints (including one SRC column / steel beam composite joint and two SRC column composite beam composite joints) with 1 / 2 scale are carried out. This paper mainly studies the seismic behavior of this kind of joints. The parameter variable is the width of floor slab and floor slab. The anti-symmetric loading method is adopted to analyze and sum up the damage form, stiffness and strength degradation law, hysteretic characteristic of the joint. Mechanical properties such as bearing capacity, displacement ductility and strain variation at some key sites. The results show that although serious shear failure occurs in the core region of the three joint specimens, the bearing capacity of the joints remains high and has good ductility and energy dissipation characteristics, which indicates that the seismic performance of the joints is good. Compared with the specimen SRC1, the bearing capacity of SRC2 and SRC3 is greatly improved, its displacement ductility is better and its energy dissipation ability is stronger. (2) the actual size of the joint member in the test is used as the model. The numerical simulation software Abaqus is used to model and mesh the composite nodes. According to the objective conditions of the test site, the simulation boundary conditions and the method of defining the load are reasonably selected. The finite element analysis of single push and cyclic loading is carried out. This paper mainly analyzes the effect of the composite effect of the cast-in-place slab on the mechanical performance of the column joint in the SRC frame, and analyzes and compares the experimental results and the numerical simulation data. It is found that the difference between the two values is within a certain range and the whole is in good agreement. The stress distribution of steel flange and web plate of SRC column in the core area can be obtained by numerical simulation, which is difficult to measure in many experiments. The stress distribution of stiffener in the core area, the stress distribution of reinforced concrete floor and the development of tensile compression damage, etc. The variable parameter analysis of composite joints is carried out. Taking SRC2 as an example, the effects of cast-in-place slab thickness, reinforcement ratio of longitudinal reinforcement and strength of concrete on the mechanical properties of joints are discussed. The results of variable parameter analysis are compared and some suggestions on earthquake resistance are given.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU398.9;TU352.11

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