屈曲约束支撑在大悬挑钢桁架结构中的耗能减震性能研究

发布时间：2018-03-13 02:40

本文选题：屈曲约束支撑　切入点：耗能减震　出处：《合肥工业大学》2017年硕士论文　论文类型：学位论文

【摘要】：传统的抗震设计方法是依靠结构自身的强度、刚度和延性来抗御地震作用,会使结构产生较大变形并导致结构损伤,一旦变形过大导致破坏或重要构件失效将造成严重的后果。而耗能减震技术则通过采用附加子阻尼结构或设置耗能装置,消耗地震能量并衰减结构地震响应,从而保护主体结构。屈曲约束支撑作为一种新型耗能减震构件,在承受拉力或压力时均表现出良好的滞回性能和耗能能力,且不存在受压失稳问题。因此本文以某博物馆工程实例为背景,对屈曲约束支撑在大悬挑钢桁架结构中的耗能减震性能进行了研究,为同类结构的耗能减震设计提供一定的参考依据。首先阐述了屈曲约束支撑体系的设计方法并以此为依据采用SAP2000有限元软件建立了整体结构的有限元计算模型,然后分别对普通钢支撑结构和三种屈曲约束支撑结构进行了弹性抗震分析和弹塑性动力时程分析,最后进行了竖向多遇地震和竖向罕遇地震作用的计算,以研究竖向地震作用对大悬挑钢桁架悬挑端的不利影响。分析结果表明:多遇地震作用下屈曲约束支撑并未屈服,仍处于弹性工作状态,作用与普通钢支撑相类似;罕遇地震作用下屈曲约束支撑率先进入屈服状态,消耗地震能量,有效地保护主体结构,屈曲约束支撑的减震性能显然要优于普通钢支撑;竖向地震对钢桁架结构大悬挑端的影响较为重要不能忽略,竖向多遇地震作用下屈曲约束支撑的抗震表现与普通钢支撑基本相同;竖向罕遇地震作用下屈曲约束支撑对悬挑端竖向加速度和竖向位移响应的控制比普通钢支撑更加有效,可以较好地改善大悬挑钢桁架结构的抗震安全性能;屈曲约束支撑采用V字形布置的减震性能要更优于人字形布置和混合布置,而以人字形布置的耗能能力则比V字形布置或混合布置更加突出。
[Abstract]:The traditional seismic design method relies on the strength, stiffness and ductility of the structure to resist the earthquake, which will make the structure deform and lead to the damage of the structure. Once the deformation is too large, the damage or the failure of important components will result in serious consequences. And the energy dissipation technology can consume the seismic energy and attenuate the seismic response of the structure by adopting additional sub-damping structure or setting up energy dissipation device. As a new type of energy dissipation shock absorber member, buckling restrained braces exhibit good hysteretic performance and energy dissipation ability when subjected to tension or pressure. There is no problem of buckling under compression. Therefore, based on a museum engineering example, the energy dissipation performance of buckling restrained braces in large cantilever steel truss structures is studied in this paper. This paper provides a certain reference for the design of energy dissipation and vibration absorption of similar structures. Firstly, the design method of buckling restrained bracing system is expounded and the finite element calculation model of the whole structure is established by using SAP2000 finite element software. Then the elastic seismic analysis and elastoplastic dynamic time history analysis of the common steel bracing structure and three buckling restrained bracing structures are carried out respectively. Finally, the vertical frequent earthquake and the vertical rare earthquake action are calculated. In order to study the adverse effect of vertical seismic action on the cantilever end of large cantilever steel truss, the results show that the buckling restrained braces are still in elastic working state, and the action is similar to that of common steel braces. Buckling restrained braces take the lead in yielding state under rare earthquake, consume seismic energy and protect the main structure effectively. The damping performance of buckling restrained braces is obviously better than that of ordinary steel braces. The influence of vertical earthquake on the large cantilever end of steel truss structure can not be ignored. The seismic behavior of buckling restrained braces under the frequent vertical earthquake is basically the same as that of common steel braces. The buckling restrained braces are more effective than ordinary steel braces in controlling the vertical acceleration and displacement response of cantilever end under the action of rare vertical earthquake, which can improve the seismic safety performance of large cantilever steel truss structures. The damping performance of buckling restrained bracing with V-shaped arrangement is better than that of herringbone arrangement and hybrid arrangement, while the energy dissipation capacity of the V-shaped arrangement is more prominent than that of V-shaped or mixed arrangement.
【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;TU391

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