型钢混凝土梁柱节点抗震性能研究

发布时间：2018-06-27 20:36

本文选题：型钢混凝土组合结构 + 梁柱节点　；参考：《长安大学》2017年硕士论文

【摘要】：型钢混凝土组合结构相对于钢筋混凝土结构,具有承载力高、延性好的特点,在抗震方面有着巨大的优势,因而在工程中得到了广泛的应用。然而,在强震作用下,梁端塑性铰较易诱发梁柱连接焊缝发生脆性断裂,且渗透到节点核心区,从而大幅度降低型钢混凝土结构的抗震性能。本文提出对型钢混凝土梁端型钢翼缘采取热处理(HBS)新技术,通过超高温度加热,随后控制温度缓慢冷却,降低钢筋局部强度,从而将塑性铰从梁端转移到热处理部位,人为控制塑性铰区域,提高型钢混凝土梁柱节点的抗震性能,本研究具有重要理论意义和工程价值。本文以有限元软件ABAQUS为工具,选取合理的单元类型、材料模型等参数,建立型钢混凝土梁柱节点有限元模型,研究梁翼缘热处理的新型节点的抗震性能和破坏机理,并对比分析狗骨式梁翼缘节点的受力性能。研究取得的主要成果如下:1、以按照我国相关规范设计的型钢混凝土梁柱节点抗震性能实验为背景,建立型钢混凝土梁柱节点精细化有限元模型,二者受力特性的对比分析表明所建有限元模型基本确性,可用于本文的相关力学性能分析。2、基于本文所建立的型钢混凝土梁柱节点有限元模型,对型钢混凝土梁翼缘通过局部热处理(HBS),分析该节点在水平地震作用下的破坏机理、损伤性能以及翼缘热处理削弱对节点受力性能的影响,研究其承载能力、延性、耗能能力以及恢复力特性。结果表明:新型热处理过程对Q345B级钢有十分明显的削弱影响。翼缘热处理削弱(HBS)的型钢混凝土梁柱节点耗能能力、抗震性能优于狗骨式削弱(RBS)梁柱节点。3、基于本文所建立的型钢混凝土梁柱节点有限元模型,对型钢混凝土狗骨式梁翼缘进行模拟分析,结果表明:翼缘狗骨式削弱(RBS)的型钢混凝土梁柱节点延性好,变形能力强,耗能能力高,具有良好抗震性能;其劣势在于翼缘削弱深度、位置,以及梁柱焊接质量对狗骨式节点影响很大。
[Abstract]:Compared with reinforced concrete structure, steel reinforced concrete composite structure has the characteristics of high bearing capacity and good ductility, and has great advantages in earthquake resistance, so it has been widely used in engineering. However, under the action of strong earthquake, the plastic hinge at the end of the beam can easily induce brittle fracture of the weld seam of Liang Zhu connection and penetrate into the core zone of the joint, thus greatly reducing the seismic behavior of the steel reinforced concrete structure. In this paper, a new heat treatment (HBS) technique for steel flange at the end of steel reinforced concrete beam is proposed. By heating at a high temperature, then controlling the temperature to cool slowly, the local strength of steel bar is reduced, and the plastic hinge is transferred from the end of the beam to the heat treatment position. This study is of great theoretical significance and engineering value for artificially controlling the plastic hinge region and improving the seismic behavior of SRC Liang Zhu joints. In this paper, the finite element model of steel reinforced concrete (SRC) Liang Zhu joints is established by means of finite element software Abaqus, and reasonable element type and material model are selected. The seismic behavior and failure mechanism of new joints with heat treatment of beam flange are studied. The mechanical behavior of the dog bone beam flange joint is compared and analyzed. The main results of the study are as follows: 1. Based on the seismic behavior experiments of SRC Liang Zhu joints designed according to the relevant codes in China, the fine finite element model of SRC Liang Zhu joints is established. The comparison and analysis of the mechanical properties show that the finite element model can be used to analyze the mechanical properties of steel reinforced concrete (SRC) joints based on the finite element model of steel reinforced concrete (SRC) joints, which can be used to analyze the mechanical properties of SRC joints in this paper. Through local heat treatment (HBS) of steel reinforced concrete beam flange, the failure mechanism of the joint under horizontal earthquake, the damage performance and the influence of flange heat treatment weakening on the bearing capacity and ductility of the joint are analyzed, and the bearing capacity and ductility of the joint are studied. Energy dissipation capacity and resilience characteristics. The results show that the new heat treatment process has a very obvious weakening effect on Q 345B grade steel. The energy dissipation capacity of steel reinforced concrete (SRC) Liang Zhu joints with flange heat treatment weakening (HBS) is better than that of dog bone weakening (Liang Zhu) joints. The finite element model of SRC Liang Zhu joints is established in this paper. The simulation analysis of steel-reinforced concrete dog-bone beam flange shows that the steel-reinforced concrete Liang Zhu joint with steel-reinforced concrete flange weakened by dog bone has good ductility, strong deformation capacity, high energy dissipation capacity and good aseismic performance. The disadvantage is that the flange weakening depth, position and Liang Zhu welding quality have great influence on the bony joints.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU398.9;TU352.11

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