本文選題：火電廠主廠房 + 扭轉效應�。� 參考：《西南交通大學》2017年碩士論文

【摘要】：地震作用下的扭轉是火電廠主廠房設計中經常遇到的問題,而為了滿足工藝的需求,通常將除氧間設計成多層框架結構,將汽機房做成單層排架結構,這樣將兩種結構形式相連所形成的框排架體系因質量和剛度的分布不均勻,具有很強的不規(guī)則性。加上設備種類繁多、縱橫向尺寸差別大、空間布置復雜等特點,結構在地震作用下容易產生較大的扭轉效應并存在多個薄弱層。因此,為了保證電力系統(tǒng)在地震作用下的正常運行,有必要對火電廠主廠房因結構的扭轉效應進行分析,并在此基礎上采取措施進行控制。本文以某火電廠框排架主廠房作為工程背景,采用振型分解反應譜分析和彈性動力時程分析的方法,通過從平面和空間兩個維度上考察結構的自振特性、地震變形、結構內力、不規(guī)則參數及豎向構件扭轉指標,得到了結構薄弱層分布、扭轉特點、不規(guī)則分布及地震響應規(guī)律。在此基礎上,在結構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,分析其動力特性及扭轉位移比的變化。選取最合理的鋼支撐布置方式,對比分析了增加鋼支撐以后,扭轉效應對結構變形和構件內力影響的改變。分析結果表明:因質量和剛度的不均勻分分布,火電廠主廠房結構存在多個薄弱層,平面和豎向不規(guī)則,扭轉效應強。對布置了鋼支撐的模型分析結果表明:在單向布置支撐時,橫向鋼支撐分開布置能夠有效的降低扭轉指標,增大扭轉剛度,而縱向鋼支撐的單向布置只能增強結構的平動剛度;在結構端部雙向分散布置兩個方向的鋼支撐不僅增大了結構扭轉剛度,控制了扭轉指標,并且有效的降低了偏心導致的結構變形放大,減緩了扭轉效應對結構邊柱及排架柱內力的放大,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.
【學位授予單位】：西南交通大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU352.11

【參考文獻】

相關期刊論文 前10條

1 林芹;;偏心支撐鋼框架的設計[J];山西建筑;2011年02期

2 李玉榮;蔡康峰;唐月;;中心支撐-框架鋼結構設計與研究[J];工業(yè)建筑;2010年11期

3 石永久;熊俊;王元清;劉歌青;;多層鋼框架偏心支撐的抗震性能試驗研究[J];建筑結構學報;2010年02期

4 張耀春;于海豐;張文元;連尉安;;焊接工字形鋼支撐等幅軸向反復循環(huán)荷載下低周疲勞性能試驗[J];東南大學學報(自然科學版);2009年03期

5 張子引;趙彪;曹偉煒;李勇;葛正翔;;四川汶川8.0級地震電網受災情況調研與初步分析[J];電力技術經濟;2008年04期

6 于永清;李光范;李鵬;朱全軍;袁大陸;王承玉;李金忠;黃璜;李立新;張星海;劉敬民;;四川電網汶川地震電力設施受災調研分析[J];電網技術;2008年11期

7 蘇陽;范潔;;火電廠主廠房結構優(yōu)化分析[J];河北電力技術;2007年06期

8 潘華;李金臣;吳迪忠;;2007年7月16日日本新o_地震對柏崎刈羽核電站的影響[J];國際地震動態(tài);2007年11期

9 申永康;萬斌;邵建華;;偏心支撐鋼框架延性抗震設計探討[J];工程抗震與加固改造;2007年02期

10 沈祖炎;黃奎生;陳以一;童駿;;大型火電廠主廠房鋼支撐-框架結構振動臺試驗模型[J];建筑科學與工程學報;2006年04期

相關碩士學位論文 前1條

1 章海斌;火電廠鋼結構主廠房抗震分析[D];浙江大學;2009年

，

本文編號：2104487