【摘要】：通過分析國內(nèi)外的多次地震我們發(fā)現(xiàn),結(jié)構(gòu)在地震作用下不只發(fā)生水平和豎直方向的振動,扭轉(zhuǎn)振動也同時產(chǎn)生,而地震下的扭轉(zhuǎn)反應(yīng)是引起結(jié)構(gòu)抗震性能退化、導(dǎo)致結(jié)構(gòu)損壞乃至倒塌的重要原因。由于土地資源的稀缺、建筑功能的多元化,建筑師們不再滿足于簡單的外觀,因此超限高層變得越來越普遍、結(jié)構(gòu)形式越來越復(fù)雜,不規(guī)則結(jié)構(gòu)的出現(xiàn)難以避免。鑒于扭轉(zhuǎn)破壞的嚴重性,對地震作用下結(jié)構(gòu)扭轉(zhuǎn)效應(yīng)的影響因素進行分析研究并在設(shè)計過程中進行合理控制是十分必要的。本文通過對剛心和質(zhì)心不重合的單層和多層偏心結(jié)構(gòu)進行結(jié)構(gòu)分析,重點分析了框架結(jié)構(gòu)、框架剪力墻結(jié)構(gòu)扭轉(zhuǎn)效應(yīng)的影響因素,并通過超限工程實例重點論述了控制結(jié)構(gòu)扭轉(zhuǎn)效應(yīng)的方法,對比了不同調(diào)整方案的合理性和可行性,主要做了以下幾方面工作:(1)建立多個單層偏心框架結(jié)構(gòu)和框筒結(jié)構(gòu)模型,對周期比、位移比與偏心率的關(guān)系進行分析;采用剪力比值作為評價結(jié)構(gòu)扭轉(zhuǎn)效應(yīng)的參數(shù),建立多個單層的偏心框架結(jié)構(gòu)和框剪結(jié)構(gòu)模型,對偏心率和剪力比值的關(guān)系進行分析。發(fā)現(xiàn)隨著結(jié)構(gòu)質(zhì)心和剛心偏離程度的增大,周期比反常減小,但結(jié)構(gòu)的扭轉(zhuǎn)效應(yīng)有增大趨勢。(2)建立多個多層的偏心框架結(jié)構(gòu)模型,對結(jié)構(gòu)的周期比、位移比與偏心率的關(guān)系進行分析,同時對周期比與建筑高度間的關(guān)系做了分析;采用樓層位移比值作為評價結(jié)構(gòu)整體扭轉(zhuǎn)效應(yīng)的指標,對結(jié)構(gòu)長寬比、偏心方向與結(jié)構(gòu)扭轉(zhuǎn)效應(yīng)的關(guān)系進行分析。結(jié)果顯示,長寬比、偏心方向、建筑高度均對結(jié)構(gòu)扭轉(zhuǎn)效應(yīng)有顯著影響。(3)針對超限工程實例,根據(jù)上述研究成果,調(diào)整模型給出多個不同控制結(jié)構(gòu)扭轉(zhuǎn)效應(yīng)的方案,并對比小震下包括周期比和位移比在內(nèi)的參數(shù)的變化情況,綜合評價結(jié)構(gòu)的抗震性能,同時比較不同方案下中震墻肢抗拉性能和大震下的層間位移角。本文分析了結(jié)構(gòu)扭轉(zhuǎn)效應(yīng)的影響因素,并通過在工程實例的具體應(yīng)用,旨在對今后的研究和設(shè)計工作提供一定的參考價值。
[Abstract]:Through the analysis of many earthquakes at home and abroad, we find that not only horizontal and vertical vibration occurs, but also torsional vibration occurs under earthquake, and the torsional response under earthquake results in the degradation of seismic performance of the structure. The main causes of structural damage and even collapse. Due to the scarcity of land resources and the diversification of architectural functions, architects are no longer satisfied with the simple appearance, so the over-limited high-rise has become more and more common, the structural forms are becoming more and more complex, and the appearance of irregular structures is difficult to avoid. In view of the severity of torsional failure, it is necessary to analyze and study the factors affecting the torsional effect of structures under earthquake and to control it reasonably in the design process. Based on the structural analysis of single-layer and multi-story eccentricity structures with incongruous center of mass and rigid center, the factors affecting torsional effect of frame structure and frame shear wall structure are analyzed in this paper. The method of controlling the torsional effect of the structure is discussed through the example of the over-limit engineering, and the rationality and feasibility of the different adjustment schemes are compared. The main works are as follows: (1) to establish several single-layer eccentric frame structures and frame-tube structure models, and analyze the relationship between period ratio, displacement ratio and eccentricity; The shear ratio is used as a parameter to evaluate the torsional effect of a structure, and several single-layer eccentric frame structures and frame-shear structure models are established, and the relationship between eccentricity and shear ratio is analyzed. It is found that the periodic ratio decreases with the increase of the deviation degree of the center of mass and the rigid center, but the torsional effect of the structure tends to increase. (2) several multi-story eccentric frame structure models are established, and the periodic ratio of the structure is obtained. The relationship between displacement ratio and eccentricity is analyzed, and the relationship between period ratio and building height is also analyzed. The ratio of floor displacement is used as the index to evaluate the overall torsional effect of the structure. The relationship between the ratio of length to width, the eccentric direction and the torsional effect of the structure is analyzed. The results show that the ratio of length to width, eccentric direction and building height have significant effects on the torsional effect of the structure. (3) according to the above research results, the adjustment model gives several schemes to control the torsional effect of the structure. By comparing the variation of the parameters including period ratio and displacement ratio under small earthquake, the seismic performance of the structure is evaluated synthetically, and the tensile behavior of the middle earthquake wall limb and the interstory displacement angle under the strong earthquake are compared at the same time. In this paper, the factors influencing the torsional effect of structures are analyzed, and through the concrete application in engineering examples, the paper aims to provide some reference value for the future research and design work.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU311.3

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