地震作用下屈曲约束支撑与钢框架连接节点的试验研究和理论分析

发布时间：2018-01-10 07:32

本文关键词：地震作用下屈曲约束支撑与钢框架连接节点的试验研究和理论分析　出处：《合肥工业大学》2017年硕士论文　论文类型：学位论文

【摘要】：屈曲约束支撑是一种新型有效的减震耗能构件,其与框架的连接具有轻质、抗侧力强、抗震性能好等优点,已经广泛应用于实际工程中。本文研究了屈曲约束支撑与钢框架连接节点在不同连接方式下的抗震性能、破坏模式及工作机理的影响,进行了五榀屈曲约束支撑与钢框架连接节点试件的拟静力试验,对其在地震作用下的工作机理进行了深入分析,开展了有限元分析和参数分析研究。主要开展了如下研究工作:(1)进行了五榀屈曲约束支撑与钢框架连接节点试件的水平低周反复加载试验,研究参数为屈曲约束支撑与节点板的连接形式。详细考察了不同参数变化下屈曲约束支撑与钢框架连接节点的荷载(P)-位移(Δ)关系滞回曲线等抗震性能及破坏模式。(2)对各个试件的试验结果进行深入的讨论和理论分析,详细研究了屈曲约束支撑与钢框架连接节点的强度退化、刚度退化、耗能能力、延性系数等抗震性能指标,并从屈曲约束支撑与节点板转动变形和关键部位应变变化的过程分析了结构的工作机理及各构件的屈服顺序。(3)利用ABAQUS程序分别建立了屈曲约束支撑与钢框架连接节点的有限元分析模型,获得了试件的水平荷载(P)-水平位移(Δ)关系曲线,并验证了有限元模型的准确性。分别对屈曲约束支撑与节点板两端焊接连接和混合连接(螺栓-销)试件进行了单调荷载作用下的非线性受力全过程分析,获悉其破坏机理和节点区域的应力应变分布规律。(4)利用ABAQUS程序建立了单层单跨屈曲约束支撑钢框架的简化计算模型,并验证了其准确性。考察了节点板的钢材屈服强度、轴压比、节点板厚度、节点板上加劲肋端部到节点板边缘的垂直距离(L)与节点板Whitmore有效宽度(bE)的比值、屈曲约束支撑与节点板连接形式、节点板有无加劲板和框架高宽比等参数对结构受力性能和应力分布的影响。
[Abstract]:Buckling restrained bracing is a new type of effective seismic energy dissipation member, its connection with the frame has the advantages of light weight, strong lateral force resistance, good seismic performance and so on. It has been widely used in practical engineering. In this paper, the seismic behavior, failure mode and working mechanism of buckling restrained braces and steel frame connections under different connection modes are studied. Quasi static tests of five specimens of buckling restrained braces and steel frame connection joints were carried out, and the working mechanism of the specimens under seismic action was analyzed in depth. The finite element analysis and parameter analysis are carried out. The main work is as follows: 1) five specimens of buckling restrained braces and steel frame joints are subjected to horizontal low-cycle repeated loading tests. The parameters are the joint form of buckling restrained bracing and joint plate. The load and displacement (螖) of buckling restrained bracing and steel frame connection joint under different parameters are investigated in detail. Relation hysteretic curve and other seismic behavior and failure mode. 2) the experimental results of each specimen are discussed and analyzed theoretically. The strength degradation, stiffness degradation, energy dissipation capacity, ductility coefficient and other seismic performance indexes of buckling restrained braces and steel frame connections are studied in detail. The working mechanism of the structure and the yield order of each member are analyzed from the process of buckling restrained bracing, rotational deformation of the joint plate and strain change at the key position. The finite element analysis model of the joint between buckling restrained braces and steel frame is established by ABAQUS program. The horizontal load and horizontal displacement (螖) curves of the specimens are obtained. The accuracy of the finite element model is verified. The nonlinear load analysis of buckling restrained braces and welded joints (bolt-pin) specimens under monotonic load is carried out. The failure mechanism and the stress-strain distribution in the joint region are known. (4) A simplified calculation model of single-story single-span buckling braced steel frame is established by using ABAQUS program. The steel yield strength, axial compression ratio and thickness of the joint plate were investigated. The ratio of the vertical distance from the stiffened rib end to the edge of the joint plate to the Whitmore effective width of the joint plate, the buckling constraint support and the connection form of the joint plate. The influence of stiffened plate and the ratio of height to width of the frame on the mechanical performance and stress distribution of the structure with or without stiffening plate.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU352.11

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