本文關(guān)鍵詞：防屈曲支撐在三心圓柱面網(wǎng)殼中的減震控制研究　出處：《河北工程大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 三心圓柱面網(wǎng)殼 防屈曲支撐 SAP2000 非線性時(shí)程分析 減震系數(shù)

【摘要】：隨著近年來大跨度網(wǎng)殼結(jié)構(gòu)的應(yīng)用日益廣泛，其中多為重要公共建筑，一旦發(fā)生地震破壞將會(huì)造成巨大的生命財(cái)產(chǎn)損失，所以提高結(jié)構(gòu)的抗震性能并采取有效的減震措施十分重要。網(wǎng)殼結(jié)構(gòu)由于自身形式的多樣性、桿件和節(jié)點(diǎn)數(shù)目繁多、振型密集復(fù)雜等，，減震控制的研究才剛剛起步。 防屈曲支撐（BRB）是一類耗能減震元件，在受拉和受壓過程中，核心單元因受到約束單元的約束，產(chǎn)生屈服而不屈曲。在強(qiáng)震中BRB能夠率先進(jìn)入耗能狀態(tài)，消耗輸入結(jié)構(gòu)中的地震能量及衰減結(jié)構(gòu)的地震作用，保護(hù)主體結(jié)構(gòu)和構(gòu)件避免遭到破壞，能有效減小網(wǎng)殼的地震響應(yīng)。采用這種新的抗震設(shè)計(jì)思路，避免了一些傳統(tǒng)設(shè)計(jì)中存在的問題。 本文以某64m跨度的三心圓柱面網(wǎng)殼干煤棚為工程背景，利用SAP2000進(jìn)行建模，通過模態(tài)分析與力學(xué)性能分析，得出網(wǎng)殼結(jié)構(gòu)的動(dòng)力特性與動(dòng)靜力特性。根據(jù)結(jié)構(gòu)的動(dòng)靜力特性及防屈曲支撐特點(diǎn)選取了五種防屈曲支撐布置方案，利用非線性時(shí)程分析法計(jì)算結(jié)構(gòu)的地震作用，計(jì)算分析時(shí)對(duì)結(jié)構(gòu)分別輸入了El Centro波、Taft波及唐山波的三向地震作用，對(duì)比地震作用下幾種不同方案在三種地震波作用下的減震效果，得出了將防屈曲支撐布置在地震作用下內(nèi)力較大的橫向1/4波、3/4波上弦桿件處對(duì)結(jié)構(gòu)有較好的減震效果。對(duì)將防屈曲支撐布置在橫向1/4波、3/4波上弦桿的跨度分別為70m及79m的三心圓柱面網(wǎng)殼進(jìn)行了減震性能分析，結(jié)果表明減震性能良好，為今后大跨度空間網(wǎng)殼結(jié)構(gòu)減震控制研究提供一定的參考。
[Abstract]:With the increasing application of long-span latticed shell structures in recent years, most of them are important public buildings, once earthquake damage will cause huge loss of life and property. Therefore, it is very important to improve the seismic performance of the structure and take effective measures to reduce the earthquake. Because of the diversity of its own forms, the number of members and joints is various, and the vibration modes are dense and complex. The study of damping control is just beginning. Anti-buckling bracing (BRBB) is a kind of energy dissipation element. In the process of tension and compression, the core element is constrained by the constraint element. In strong earthquakes, BRB can take the lead in energy dissipation, consume the seismic energy in the input structure and attenuate the seismic action of the structure, and protect the main structure and components from being destroyed. It can effectively reduce the seismic response of reticulated shells. This new seismic design method can avoid some problems in traditional design. In this paper, a 64m span dry coal shed with a three-center cylindrical reticulated shell is used as the engineering background. The model is modeled by SAP2000, and the modal analysis and mechanical performance analysis are carried out. The dynamic and dynamic characteristics of the latticed shell structure are obtained. According to the dynamic and dynamic characteristics of the structure and the characteristics of anti-buckling bracing, five kinds of anti-buckling bracing arrangements are selected. The nonlinear time-history analysis method is used to calculate the seismic action of the structure, and the three-dimensional seismic action of the El Centro wave and Tangshan wave is input into the structure respectively. By comparing the damping effect of several different schemes under the action of three kinds of seismic waves, the transverse 1/4 wave with large internal force is obtained by arranging the buckling bracing under earthquake action. The upper chord member of 3/4 wave has better damping effect on the structure, and the anti-buckling bracing is arranged in the transverse 1/4 wave. The vibration absorption performance of three-core cylindrical reticulated shell with span of 70m and 79m on 3/4 wave is analyzed. The results show that the damping performance is good. It provides a certain reference for the future research on the damping control of large span space reticulated shell structures.
【學(xué)位授予單位】：河北工程大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU399;TU352.1

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