BRB的布置方案对钢框架结构抗震性能的影响

发布时间：2018-05-02 04:00

本文选题：错列支撑框架结构 + 防屈曲支撑　；参考：《大连理工大学》2015年硕士论文

【摘要】：随着城市人口集中、用地紧张以及商业竞争的激烈化,越来越多的土木工程结构采用高层建筑。高层建筑中框架结构的使用十分普遍,带支撑的框架结构可以有效地降低结构的侧向位移,但在强震作用下支撑易产生屈曲,造成支撑部位的破坏和失效,其滞回耗能作用会大大减弱,从而使整体结构的减震性能降低。为了解决普通支撑受压屈曲和滞回性能差的问题,国外学者研究出一种性能优良的防屈曲支撑(BRB)装置。防屈曲支撑在抵御大震时的能力更强,大震后即使防屈曲支撑发生了较大屈服,也能够很方便地更换,不影响建筑整体使用。鉴于防屈曲支撑和错列钢支撑框架结构的优点,本文提出了一种错列防屈曲支撑框架结构布置方案体系,主要开展了以下工作：(1)提出了错列防屈曲支撑框架结构,给出了错列防屈曲支撑框架结构的布置形式；总结了防屈曲支撑设计中需要的相关参数取值方法,并对改进后的Bouc-Wen模型进行了相关公式的推导,建立了可以通过数学方法近似求解模型的直接求解表达式,没有迭代过程,不需要收敛区间,可以通过手算求解方程。(2)采用不同的BRB布置方案,对无支撑框架结构、错列布置BRB框架结构和普通布置BRB框架结构分别进行了Push-over分析,通过对几种不同框架结构的塑性铰发展趋势和途径、基底剪力-位移曲线以及能力谱和需求谱曲线的研究,得到了错列布置BRB框架结构与普通布置的BRB框架结构具有相似的塑性铰发展趋势,提出两种改进的错列布置BRB框架结构模型,得到了造价更低抗震性能无明显下降的支撑布置方式,验证了错列防屈曲支撑框架结构在实际工程中使用的可行性。(3)利用SAP2000软件分别对无支撑、普通防屈曲支撑及错列防屈曲支撑的框架结构进行了动力特性分析和地震弹塑性时程分析,通过对比分析验证了错列防屈曲支撑框架结构体系良好的抗震性能和优越的经济效益。
[Abstract]:With the concentration of urban population, the shortage of land and the fierce competition of commerce, more and more civil engineering structures adopt high-rise buildings. The use of frame structure in high-rise buildings is very common. The braced frame structure can effectively reduce the lateral displacement of the structure, but the bracing is prone to buckle under the action of strong earthquake, resulting in the failure and failure of the support. The hysteretic energy dissipation will be weakened greatly, and the seismic absorption performance of the whole structure will be reduced. In order to solve the problem of poor buckling and hysteretic performance of common braces, a kind of anti-buckling brace BRBs with excellent performance has been developed by foreign scholars. The anti-buckling bracing is more capable of resisting strong earthquake. Even if the buckling bracing has a large yield after the earthquake, it can be easily replaced without affecting the overall use of the building. In view of the advantages of anti-buckling bracing and staggered steel braced frame structure, this paper presents a staggered buckling braced frame structure layout system, mainly carried out the following work: 1) the staggered anti-buckling bracing frame structure is proposed. The layout form of staggered buckling braced frame structure is given, and the relevant parameter selection method in buckling bracing design is summarized, and the related formula of improved Bouc-Wen model is deduced. The direct solution expression of the model can be approximately solved by mathematical method. There is no iterative process, no convergence interval is required, and different BRB arrangement schemes can be used to solve the equation by hand. The staggered BRB frame structure and the general arrangement BRB frame structure are analyzed by Push-over. The development trend and approach of plastic hinge of several different frame structures, the base shear displacement curve, the capacity spectrum and the demand spectrum curve are studied. The development trend of plastic hinge of staggered BRB frame structure is similar to that of common BRB frame structure. Two improved staggered arrangement BRB frame structure models are proposed. The bracing arrangement with lower cost and less seismic performance is obtained, which verifies the feasibility of using staggered buckling braced frame structure in practical engineering. The dynamic characteristics and seismic elastic-plastic time-history analysis of frame structures with common buckling braces and staggered buckling braces are analyzed. Through comparative analysis, the good seismic performance and superior economic benefit of staggered buckling braced frame structure system are verified.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU973.13;TU973.31

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