基于框架结构的屈曲约束支撑的动力分析

发布时间：2018-01-18 13:16

本文关键词：基于框架结构的屈曲约束支撑的动力分析　出处：《合肥工业大学》2017年硕士论文　论文类型：学位论文

【摘要】：屈曲约束支撑作为一种新型金属位移型耗能减震装置,具有安全性、经济性、技术合理性等优越性。屈曲约束支撑通过外围约束单元抑制内核芯材,使其在轴向拉力和压力作用下屈服耗能,不仅起到普通支撑的作用,而且具有良好的滞回耗能能力,可明显改善支撑框架体系的延性和抗震性能。对于高烈度区特殊功能需求的框架结构在地震作用下竖向抗侧力构件会发生较大的塑性变形而破坏,若对其进行屈曲约束支撑的被动控制减震设计,通过吸收能量在很大程度上改善结构在地震荷载作用下的响应,因此对屈曲约束支撑和支撑框架结构的动力性能的研究是具有理论意义和实用意义的。论文首先对屈曲约束支撑的工作机理和体系理论进行总结,接着基于ABAQUS软件模拟分析屈曲约束支撑,进行特征值分析和不同约束比、初始缺陷和间隙的大小等因素对其承载力性能的影响的分析,得出屈曲约束支撑应保证合理的约束刚度比和间隙大小。论文以某高烈度区的框架结构为工程背景,基于MIDAS/Gen对高烈度区纯钢筋混凝土框架、普通钢支撑混凝土框架进行遇地震作用下的反应谱分析和线性时程分析,认为在多遇地震作用下,支撑能有效减小结构的位移反应,并且降低原结构超筋柱所受的水平地震作用,解决其超筋问题;通过对纯钢筋混凝土框架、普通钢支撑混凝土框架、屈曲约束支撑框架结构在罕遇地震作用下的动力弹塑性时程分析,认为屈曲约束支撑能有效减小地震反应,保护主体结构。最后,对工程实例进行基于目标位移法的屈曲约束支撑的优化设计分析,得出屈曲约束支撑的滞回曲线饱满,结构竖向刚度更加均匀,为类似屈曲约束支撑在框架结构中的设计提供参考。
[Abstract]:As a new type of metal displacement energy dissipation device, buckle-constrained bracing has the advantages of safety, economy, technical rationality and so on. It can yield and consume energy under the action of axial tension and pressure, which not only plays the role of common support, but also has good hysteretic energy dissipation ability. The ductility and aseismic performance of braced frame system can be improved obviously. If the passively controlled damping design of buckling restrained braces is carried out, the response of the structure under earthquake load can be improved to a great extent by absorbing energy. Therefore, it is of theoretical and practical significance to study the dynamic behavior of buckle-constrained braces and braced frame structures. Firstly, the working mechanism and system theory of buckle-constrained braces are summarized in this paper. Then the buckling constraint braces are simulated and analyzed based on ABAQUS software. The eigenvalue analysis and the influence of different constraint ratios, initial defects and the size of the gap on the bearing capacity of the braces are analyzed. It is concluded that the buckling restrained braces should ensure a reasonable constraint stiffness ratio and clearance size. This paper takes the frame structure in a high intensity zone as the engineering background and applies MIDAS/Gen to the pure reinforced concrete frame in the high intensity zone. The response spectrum analysis and linear time history analysis of ordinary steel-braced concrete frame under earthquake are carried out. It is concluded that the bracing can effectively reduce the displacement response of the structure under the frequent earthquake. And reduce the horizontal earthquake action of the superreinforced column of the original structure, and solve the problem of superreinforcement. Through the dynamic elastic-plastic time history analysis of pure reinforced concrete frame, ordinary steel braced concrete frame and buckling restrained braced frame structure under rare earthquake, it is considered that buckling restrained bracing can effectively reduce earthquake response. Finally, the optimization design analysis of buckling constraint braces based on objective displacement method is carried out, and the hysteretic curve of buckling restrained braces is full and the vertical stiffness of structures is more uniform. It provides a reference for the design of similar buckling constraint braces in frame structures.
【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】：TU352.1

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