本文選題：屈曲約束支撐　切入點：耗能減震　出處：《合肥工業(yè)大學》2017年碩士論文　論文類型：學位論文

【摘要】：傳統(tǒng)的抗震設計方法是依靠結(jié)構(gòu)自身的強度、剛度和延性來抗御地震作用,會使結(jié)構(gòu)產(chǎn)生較大變形并導致結(jié)構(gòu)損傷,一旦變形過大導致破壞或重要構(gòu)件失效將造成嚴重的后果。而耗能減震技術(shù)則通過采用附加子阻尼結(jié)構(gòu)或設置耗能裝置,消耗地震能量并衰減結(jié)構(gòu)地震響應,從而保護主體結(jié)構(gòu)。屈曲約束支撐作為一種新型耗能減震構(gòu)件,在承受拉力或壓力時均表現(xiàn)出良好的滯回性能和耗能能力,且不存在受壓失穩(wěn)問題。因此本文以某博物館工程實例為背景,對屈曲約束支撐在大懸挑鋼桁架結(jié)構(gòu)中的耗能減震性能進行了研究,為同類結(jié)構(gòu)的耗能減震設計提供一定的參考依據(jù)。首先闡述了屈曲約束支撐體系的設計方法并以此為依據(jù)采用SAP2000有限元軟件建立了整體結(jié)構(gòu)的有限元計算模型,然后分別對普通鋼支撐結(jié)構(gòu)和三種屈曲約束支撐結(jié)構(gòu)進行了彈性抗震分析和彈塑性動力時程分析,最后進行了豎向多遇地震和豎向罕遇地震作用的計算,以研究豎向地震作用對大懸挑鋼桁架懸挑端的不利影響。分析結(jié)果表明:多遇地震作用下屈曲約束支撐并未屈服,仍處于彈性工作狀態(tài),作用與普通鋼支撐相類似;罕遇地震作用下屈曲約束支撐率先進入屈服狀態(tài),消耗地震能量,有效地保護主體結(jié)構(gòu),屈曲約束支撐的減震性能顯然要優(yōu)于普通鋼支撐;豎向地震對鋼桁架結(jié)構(gòu)大懸挑端的影響較為重要不能忽略,豎向多遇地震作用下屈曲約束支撐的抗震表現(xiàn)與普通鋼支撐基本相同;豎向罕遇地震作用下屈曲約束支撐對懸挑端豎向加速度和豎向位移響應的控制比普通鋼支撐更加有效,可以較好地改善大懸挑鋼桁架結(jié)構(gòu)的抗震安全性能;屈曲約束支撐采用V字形布置的減震性能要更優(yōu)于人字形布置和混合布置,而以人字形布置的耗能能力則比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.
【學位授予單位】：合肥工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU352.1;TU391

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