本文選題：大底盤雙塔結(jié)構(gòu) + 水平地震振型�。� 參考：《中南林業(yè)科技大學(xué)》2017年碩士論文

【摘要】：大底盤多塔樓屬于復(fù)雜高層結(jié)構(gòu),它的體型龐大復(fù)雜,平面不規(guī)則,剛度分布不均勻,在地震作用下會(huì)產(chǎn)生復(fù)雜的扭轉(zhuǎn),其設(shè)計(jì)及抗震研究難度高。當(dāng)前對(duì)大底盤多塔樓的研究還不夠成熟,尤其在它的抗震方面,振型多而復(fù)雜,研究起來(lái)也相當(dāng)困難,到目前為止還沒有出現(xiàn)一套完整的設(shè)計(jì)理論,所以對(duì)該類結(jié)構(gòu)的研究是很有必要的。本文對(duì)大底盤雙塔結(jié)構(gòu)地震作用影響因素進(jìn)行了比較全面的研究。改變影響水平地震作用效應(yīng)的因素,對(duì)比改變前后的周期、振型、內(nèi)力及位移特點(diǎn),并提出了簡(jiǎn)化計(jì)算方法。本文首先介紹了大底盤雙塔結(jié)構(gòu)的最常用的理論分析方法--反應(yīng)譜法,通過(guò)對(duì)反應(yīng)譜理論的推導(dǎo),分析了雙塔結(jié)構(gòu)的振型參與系數(shù)及結(jié)構(gòu)地震響應(yīng),根據(jù)五種基本振型從振型分解反應(yīng)譜法的角度分析了結(jié)構(gòu)的振動(dòng)特點(diǎn)。應(yīng)用大型有限元軟件MIDAS GEN對(duì)結(jié)構(gòu)建立基本模型,通過(guò)改變影響因素,如塔樓層數(shù)、大底盤層數(shù)、樓面板厚度、塔樓位置、樓板開洞以及嵌固端的位置等對(duì)結(jié)構(gòu)分別進(jìn)行了全面的對(duì)比分析,對(duì)比了各結(jié)構(gòu)模型在改變影響因素前后的地震反應(yīng)特點(diǎn),包括振型周期等結(jié)構(gòu)自振特性以及地震力、內(nèi)力與位移等地震作用效應(yīng),對(duì)某些結(jié)構(gòu)還比較了結(jié)構(gòu)中某些特殊的局部桿件的內(nèi)力及位移。根據(jù)對(duì)比結(jié)果得出了相關(guān)影響因素對(duì)結(jié)構(gòu)的影響程度及在大底盤設(shè)計(jì)時(shí)應(yīng)注意的問(wèn)題,研究表明,大底盤層數(shù)和剛度、塔樓的層數(shù)和位置的改變均對(duì)結(jié)構(gòu)有一定的影響。最后研究了結(jié)構(gòu)分析的簡(jiǎn)化方法,一種是把雙塔結(jié)構(gòu)剖分為兩個(gè)單塔結(jié)構(gòu)進(jìn)行分析,對(duì)比了單塔結(jié)構(gòu)與雙塔結(jié)構(gòu)的地震反應(yīng)特點(diǎn),對(duì)稱雙塔結(jié)構(gòu)的大底盤對(duì)雙塔有約束和協(xié)調(diào)作用,其塔樓部分的內(nèi)力及位移均略小于大底盤單塔結(jié)構(gòu),在某些情況下大底盤對(duì)稱雙塔結(jié)構(gòu)可以剖分為單塔計(jì)算;一種為改變嵌固端位置,分析不同嵌固端位置對(duì)結(jié)構(gòu)地震效應(yīng)的影響,提出簡(jiǎn)化方法應(yīng)注意的問(wèn)題。
[Abstract]:The large chassis multi-tower is a complex high-rise structure with large and complex shape, irregular plane and uneven stiffness distribution, which will produce complex torsion under the action of earthquake, and its design and seismic research are very difficult. At present, the research on large chassis and multi-tower buildings is not mature enough, especially in the aspect of earthquake resistance, the vibration modes are many and complex, and it is quite difficult to study. So far, there has not been a complete set of design theory. So it is necessary to study this kind of structure. In this paper, the influencing factors of seismic action of large chassis double tower structures are studied comprehensively. The influence factors of horizontal earthquake action are changed, and the characteristics of period, mode shape, internal force and displacement before and after the change are compared, and a simplified calculation method is put forward. In this paper, the most commonly used theoretical analysis method of large chassis double-tower structure, the response spectrum method, is introduced in this paper. Through the derivation of the response spectrum theory, the mode participation coefficient and the seismic response of the double-tower structure are analyzed. The vibration characteristics of the structure are analyzed from the viewpoint of the mode decomposition response spectrum method according to the five basic modes. The basic model of the structure is established by using the large-scale finite element software MIDAS GEN. By changing the influencing factors, such as the number of tower floors, the number of large chassis floors, the thickness of floor panel, the position of tower, In this paper, the structure is compared and analyzed in detail, such as the opening of floor slab and the location of the fixed end. The seismic response characteristics of each structural model before and after changing the influencing factors are compared, including the natural vibration characteristics and seismic forces of the structure, such as the mode period, and so on. For some structures, the internal forces and displacements of some special local members are also compared. According to the results of comparison, the influence degree of related factors on the structure and the problems that should be paid attention to in the design of large chassis are obtained. The study shows that the change of floor number and stiffness of large chassis and the change of floor number and position of tower have certain influence on the structure. Finally, the simplified method of structural analysis is studied. One is to divide the double tower structure into two single tower structures for analysis, and to compare the seismic response characteristics between the single tower structure and the double tower structure. The internal force and displacement of the tower part are slightly smaller than that of the large chassis single tower structure. In some cases, the symmetrical double tower structure with large chassis can be divided into single tower structure. In order to change the fixed end position and analyze the influence of different fixed end position on the seismic effect of the structure, the paper puts forward some problems that should be paid attention to in the simplified method.
【學(xué)位授予單位】：中南林業(yè)科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU973.31

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