本文選題：火電廠主廠房 + 扭轉(zhuǎn)效應(yīng)　； 參考：《西南交通大學(xué)》2017年碩士論文

【摘要】：地震作用下的扭轉(zhuǎn)是火電廠主廠房設(shè)計(jì)中經(jīng)常遇到的問題,而為了滿足工藝的需求,通常將除氧間設(shè)計(jì)成多層框架結(jié)構(gòu),將汽機(jī)房做成單層排架結(jié)構(gòu),這樣將兩種結(jié)構(gòu)形式相連所形成的框排架體系因質(zhì)量和剛度的分布不均勻,具有很強(qiáng)的不規(guī)則性。加上設(shè)備種類繁多、縱橫向尺寸差別大、空間布置復(fù)雜等特點(diǎn),結(jié)構(gòu)在地震作用下容易產(chǎn)生較大的扭轉(zhuǎn)效應(yīng)并存在多個(gè)薄弱層。因此,為了保證電力系統(tǒng)在地震作用下的正常運(yùn)行,有必要對(duì)火電廠主廠房因結(jié)構(gòu)的扭轉(zhuǎn)效應(yīng)進(jìn)行分析,并在此基礎(chǔ)上采取措施進(jìn)行控制。本文以某火電廠框排架主廠房作為工程背景,采用振型分解反應(yīng)譜分析和彈性動(dòng)力時(shí)程分析的方法,通過從平面和空間兩個(gè)維度上考察結(jié)構(gòu)的自振特性、地震變形、結(jié)構(gòu)內(nèi)力、不規(guī)則參數(shù)及豎向構(gòu)件扭轉(zhuǎn)指標(biāo),得到了結(jié)構(gòu)薄弱層分布、扭轉(zhuǎn)特點(diǎn)、不規(guī)則分布及地震響應(yīng)規(guī)律。在此基礎(chǔ)上,在結(jié)構(gòu)中布置符合工藝要求的鋼支撐,并改變支撐布置形式和布置位置,分析其動(dòng)力特性及扭轉(zhuǎn)位移比的變化。選取最合理的鋼支撐布置方式,對(duì)比分析了增加鋼支撐以后,扭轉(zhuǎn)效應(yīng)對(duì)結(jié)構(gòu)變形和構(gòu)件內(nèi)力影響的改變。分析結(jié)果表明:因質(zhì)量和剛度的不均勻分分布,火電廠主廠房結(jié)構(gòu)存在多個(gè)薄弱層,平面和豎向不規(guī)則,扭轉(zhuǎn)效應(yīng)強(qiáng)。對(duì)布置了鋼支撐的模型分析結(jié)果表明:在單向布置支撐時(shí),橫向鋼支撐分開布置能夠有效的降低扭轉(zhuǎn)指標(biāo),增大扭轉(zhuǎn)剛度,而縱向鋼支撐的單向布置只能增強(qiáng)結(jié)構(gòu)的平動(dòng)剛度;在結(jié)構(gòu)端部雙向分散布置兩個(gè)方向的鋼支撐不僅增大了結(jié)構(gòu)扭轉(zhuǎn)剛度,控制了扭轉(zhuǎn)指標(biāo),并且有效的降低了偏心導(dǎo)致的結(jié)構(gòu)變形放大,減緩了扭轉(zhuǎn)效應(yīng)對(duì)結(jié)構(gòu)邊柱及排架柱內(nèi)力的放大,為合理的支撐布置方式。
[Abstract]:Torsion under earthquake is a common problem in the design of main building of thermal power plant. In order to meet the requirement of technology, the deoxygenation room is usually designed as a multi-story frame structure, and the steam engine room is made into a single-layer frame structure. Thus the frame bent system formed by connecting the two structural forms has strong irregularity due to the uneven distribution of mass and stiffness. In addition, there are many kinds of equipments, great difference in longitudinal and horizontal dimensions, complicated space arrangement, and so on. The structure is prone to produce large torsional effect and many weak layers under earthquake action. Therefore, in order to ensure the normal operation of power system under earthquake, it is necessary to analyze the torsional effect of the main building of thermal power plant and take measures to control it. In this paper, the natural vibration characteristics, earthquake deformation and internal force of the structure are investigated from two dimensions of plane and space by using the method of mode decomposition response spectrum analysis and elastic dynamic time history analysis, taking the frame bent main building of a thermal power plant as the engineering background, and using the method of mode decomposition response spectrum analysis and elastic dynamic time history analysis. Irregular parameters and torsional index of vertical members are obtained, and the distribution of weak layer, torsional characteristics, irregular distribution and seismic response are obtained. On this basis, the steel braces are arranged in accordance with the technological requirements in the structure, and the form and position of the bracing arrangement are changed, and the dynamic characteristics and the variation of the ratio of torsional displacement are analyzed. The most reasonable arrangement of steel braces is selected and the effect of torsional effect on structural deformation and internal force of members is compared and analyzed with the increase of steel bracing. The results show that due to the uneven distribution of mass and stiffness, there are many weak layers, plane and vertical irregularity, and strong torsional effect in the main building structure of thermal power plant. The results of the model analysis show that the lateral steel bracing can effectively reduce the torsion index and increase the torsional stiffness while the unidirectional arrangement of longitudinal steel braces can only enhance the translational stiffness of the structure. The bidirectional distribution of steel braces at the end of the structure not only increases the torsional stiffness of the structure and controls the torsional index, but also effectively reduces the distortion and magnification caused by eccentricity. The effect of torsion is reduced to enlarge the internal force of the side column and the bent column, and it is a reasonable support arrangement mode.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU352.11

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