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  本文選題：附加剛度屈曲約束支撐 + 拼裝式��； 參考：《東南大學》2015年碩士論文

【摘要】：地震作用下,框架結構某層層間位移角可能遠大于其他樓層,從而形成薄弱層,在P-△效應的作用下結構的抗倒塌能力降低。為此,本文提出一種新型的結構體系——附加剛度屈曲約束支撐(Buckling Restrained Brace, BRB)框架,該結構在地震作用下,樓層層間位移角的分布均勻性可以通過附加剛度進行控制,而且附加剛度可以作為BRB低周疲勞斷裂的“保險絲”。本文從構件層次的試驗驗證了附加剛度BRB的滯回特性;從結構層次的有限元模擬分析了該新型體系的抗震性能,主要研究工作如下：(1)分析了附加剛度BRB的組成部分及工作機理,提出一種新型輕質、拼裝式的附加剛度BRB的構造方式,通過構件的擬靜力試驗得出附加剛度BRB滯回曲線,分析內(nèi)外筒不對齊和螺栓滑移等因素對構件性能的影響：基于雙折線彈塑性模型,比較了BRB、自復位BRB、附加剛度BRB的等效粘滯阻尼比；基于opensees的二維桿系簡化模型可較好的模擬出附加剛度BRB的滯回性能。(2)依據(jù)美國抗震規(guī)范設計了9層支撐鉸接BRB框架和附加剛度BRB框架,基于材料疊加和單元疊加,提出了附加剛度BRB在結構中的簡化建模方式；通過對BRB框架和附加剛度BRB框架在20條設防地震波的彈塑性時程分析,表明附加剛度BRB能有效控制層間位移角分布的不均勻,并提出附加剛度BRB框架啟動位移應取BRB框架層間位移角中位值對應的支撐位移；為解決附加剛度引起的結構加速度和基底剪力過大的問題,建議節(jié)點處采用摩擦阻尼器的“保險絲”裝置。(3)闡述多自由度體系向單自由度體系等效的理論基礎,在比較不同模型特性的基礎上選擇了Ibarra-Krawinkler模型,采用經(jīng)典的單自由度體系建立了含P-△效應的附加剛度單自由度體系：提出基于“二分法”的增量動力時程分析倒塌點搜索方法,通過該方法對附加剛度單自由度體系進行了參數(shù)分析;為對比不同周期附加剛度單自由度體系抗倒塌能力,采用了抗地震倒塌能力譜。(4)建立了2007年E-Defense三維足尺鋼框架振動臺模型；以3%應變作為BRB低周疲勞破壞準則,采用IDA方法比較了不同地震動強度下BRB框架及附加剛度BRB框架層間位移角分布情況,以DCF作為損傷分布控制的指標,說明了附加剛度有利于各層BRB充分耗能；通過比較不同次結構地震響應曲線,說明了附加剛度能有效控制樓層的最大位移角。
[Abstract]:Under earthquake action, the displacement angle between one layer of frame structure may be much larger than that of other floors, thus forming a weak layer, and the ability of resisting collapse of frame structure under the action of P- effect is reduced. In this paper, a new structure system, buckling Restrained Brace, BRB) frame with additional stiffness constraint, is proposed in this paper. The distribution uniformity of floor displacement angle can be controlled by additional stiffness under earthquake action. And the additional stiffness can be used as "fuse" for low cycle fatigue fracture of BRB. In this paper, the hysteretic characteristics of the BRB with additional stiffness are verified by the tests at the member level, the seismic behavior of the new system is analyzed by finite element simulation of the structure level, the main research work is as follows: 1) the components and working mechanism of the additional stiffness BRB are analyzed. A new type of lightweight and assembled BRB with additional stiffness is proposed. The BRB hysteretic curve of additional stiffness is obtained by quasi-static test of the members. The effects of inner and outer cylinder misalignment and bolt slip on the performance of the member are analyzed. Based on the double-fold elastic-plastic model, the equivalent viscous damping ratio of BRB, self-reset and additional stiffness BRB is compared. The simplified two-dimension bar system model based on opensees can simulate the hysteretic performance of BRB with additional stiffness better. According to the American seismic code, a 9-story braced hinged BRB frame and a BRB frame with additional stiffness are designed, which are based on material superposition and element superposition. The simplified modeling method of BRB with additional stiffness in the structure is proposed, and the elastic-plastic time-history analysis of the BRB frame and the BRB frame with additional stiffness in 20 seismic waves shows that the additional stiffness BRB can effectively control the uneven distribution of the displacement angle between the layers. In order to solve the problem of excessive acceleration and base shear force caused by additional stiffness, the supporting displacement corresponding to the median displacement angle between floors of BRB frame should be taken as the starting displacement of BRB frame with additional stiffness. It is suggested that the "fuse" device of friction damper should be used at the node to explain the theoretical basis of the equivalence of multi-degree-of-freedom system to single-degree-of-freedom system. The Ibarra-Krawinkler model is selected on the basis of comparing the characteristics of different models. The system of additional stiffness and single degree of freedom with P- effect is established by using the classical system of single degree of freedom. A method of searching the collapse point of incremental dynamic time history analysis based on "dichotomy" is proposed. The method is used to analyze the parameters of single-degree-of-freedom system with additional stiffness, and to compare the anti-collapse ability of single-degree-of-freedom system with additional stiffness in different periods. The shaking table model of E-Defense full-scale steel frame in 2007 is established by using the seismic collapse resistance spectrum. The 3% strain is used as the low cycle fatigue failure criterion of BRB. The distribution of displacement angle between BRB frame and BRB frame with additional stiffness under different ground motion intensity is compared by using IDA method. Taking DCF as the index of damage distribution control, it is shown that the additional stiffness is beneficial to the sufficient energy consumption of each floor BRB. By comparing the seismic response curves of different substructures, it is shown that the additional stiffness can effectively control the maximum displacement angle of the floor.
【學位授予單位】：東南大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TU352.11

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本文編號：1982025