本文選題：汽機(jī)基礎(chǔ) + 動(dòng)剛度　； 參考：《北方工業(yè)大學(xué)》2017年碩士論文

【摘要】：汽輪發(fā)電機(jī)基礎(chǔ)作為發(fā)電機(jī)機(jī)組的支撐結(jié)構(gòu),是機(jī)組穩(wěn)定運(yùn)行、正常發(fā)電的重要保證條件之一。基礎(chǔ)本身動(dòng)剛度、自振特性對(duì)結(jié)構(gòu)動(dòng)力響應(yīng)分析有決定性作用。汽機(jī)基座的臺(tái)板橫梁往往直接承受轉(zhuǎn)子動(dòng)力荷載,在動(dòng)力分析中起到關(guān)鍵作用,其動(dòng)力響應(yīng)也最值得關(guān)注�；A(chǔ)中作為軸承支座的鋼筋混凝土橫梁結(jié)構(gòu),在工程分析設(shè)計(jì)中,其彈性模量值往往采用素混凝土彈性模量值,與鋼筋混凝土結(jié)構(gòu)真實(shí)彈模值存在不可忽略的誤差。因此,對(duì)結(jié)構(gòu)動(dòng)剛度測試結(jié)果造成較大影響,從而使汽機(jī)基礎(chǔ)動(dòng)力特性分析值與工程實(shí)際不符。實(shí)際工程中,鋼筋混凝土構(gòu)件彈性模量取值受眾多因素的影響,配筋率不僅是直接影響因素,而且是重要影響因素之一。對(duì)于汽輪機(jī)這種大型鋼筋混凝土結(jié)構(gòu)來說,鋼筋配置直接影響發(fā)電機(jī)軸承座動(dòng)剛度,進(jìn)而影響結(jié)構(gòu)動(dòng)力響應(yīng)及結(jié)構(gòu)穩(wěn)定性,因此對(duì)鋼筋混凝土橫梁的配筋率與結(jié)構(gòu)彈性模量之間關(guān)系的研究,對(duì)整個(gè)結(jié)構(gòu)動(dòng)力分析都十分重要。本文中研究對(duì)象選自某汽輪發(fā)電機(jī)組隔振基礎(chǔ)結(jié)構(gòu),做了一系列研究,主要研究內(nèi)容及成果如下:1、對(duì)該汽機(jī)基礎(chǔ)工程動(dòng)剛度進(jìn)行現(xiàn)場實(shí)測,并以該工程為原型建立縮尺模型,進(jìn)一步測試其動(dòng)剛度是否能滿足正常運(yùn)行要求。結(jié)合現(xiàn)場實(shí)測與試驗(yàn)?zāi)Ｐ蜏y試,對(duì)該汽機(jī)基礎(chǔ)的動(dòng)剛度進(jìn)行綜合分析、評(píng)判。此外,就提高軸承橫梁動(dòng)剛度對(duì)改善整體結(jié)構(gòu)動(dòng)力特性重要性進(jìn)行分析,并從結(jié)構(gòu)設(shè)計(jì)角度對(duì)提高軸承橫梁動(dòng)剛度進(jìn)行探究。2、設(shè)計(jì)了不同配筋率的混凝土試塊,以試驗(yàn)方法研究分析了鋼筋混凝土結(jié)構(gòu)配筋率對(duì)彈性模量取值的影響,擬合得出配筋試塊彈性模量回歸方程。進(jìn)而通過試驗(yàn)與有限元模擬計(jì)算相結(jié)合的方法,研究了汽機(jī)基礎(chǔ)橫梁結(jié)構(gòu)配筋率對(duì)彈性模量取值的影響,擬合出以配筋率為自變量的彈性模量試驗(yàn)值的回歸方程,與配筋試塊試驗(yàn)回歸方程進(jìn)行對(duì)比分析,驗(yàn)證了該公式的合理性。3、基于彈性理論,推導(dǎo)了鋼筋混凝土復(fù)合彈性模量理論計(jì)算公式,與配筋試塊及橫梁試驗(yàn)回歸方程進(jìn)行對(duì)比,分析結(jié)果表明兩者計(jì)算結(jié)果較吻合,為工程設(shè)計(jì)及后續(xù)汽機(jī)基礎(chǔ)有限元模擬分析提供參數(shù)取值依據(jù)。4、根據(jù)上述對(duì)汽機(jī)基礎(chǔ)橫梁結(jié)構(gòu)的研究,采用有限元模擬建立某汽機(jī)基礎(chǔ)整體模型,對(duì)該汽機(jī)基礎(chǔ)結(jié)構(gòu)進(jìn)行了模態(tài)分析,并對(duì)軸承座處橫梁進(jìn)行諧響應(yīng)和動(dòng)剛度分析。
[Abstract]:As the supporting structure of generator unit, turbogenerator foundation is one of the important guarantee conditions for the unit to operate stably and generate electricity normally. The dynamic stiffness and natural vibration characteristics of the foundation play a decisive role in the dynamic response analysis of the structure. The cross-beam of the turbine pedestal often bears the rotor dynamic load directly, and plays a key role in the dynamic analysis, and its dynamic response is also the most worthy of attention. In the engineering analysis and design of reinforced concrete crossbeam structure which is used as bearing support, the elastic modulus value of plain concrete is often used, which is not negligible with the real elastic modulus value of reinforced concrete structure. Therefore, the test results of dynamic stiffness of the structure are greatly affected, so that the analysis value of the dynamic characteristics of the turbine foundation is not in accordance with the engineering practice. In practical engineering, the elastic modulus of reinforced concrete members is affected by many factors. Reinforcement ratio is not only a direct factor, but also one of the important factors. For the large reinforced concrete structure such as steam turbine, the reinforcement configuration directly affects the dynamic stiffness of the generator bearing seat, and then affects the dynamic response of the structure and the structural stability. Therefore, the study of the relationship between the reinforcement ratio and the elastic modulus of reinforced concrete beams is very important to the dynamic analysis of the whole structure. In this paper, the object of study is selected from the vibration isolation infrastructure of a turbine-generator unit, and a series of studies have been done. The main research contents and results are as follows: 1. The dynamic stiffness of the turbine foundation project is measured on the spot, and the scale model is established based on the prototype. Further test whether the dynamic stiffness can meet the normal operation requirements. Combined with field measurement and test model test, the dynamic stiffness of the turbine foundation is comprehensively analyzed and evaluated. In addition, the importance of increasing the dynamic stiffness of the bearing beam to improve the dynamic characteristics of the whole structure is analyzed, and from the structural design point of view to improve the dynamic stiffness of the bearing beam, the concrete test blocks with different reinforcement ratios are designed. The influence of reinforcement ratio on elastic modulus of reinforced concrete structure is studied by means of test method, and the regression equation of elastic modulus of reinforced concrete structure is obtained by fitting. Then the influence of reinforcement ratio on elastic modulus is studied by combining test with finite element simulation, and the regression equation of test value of elastic modulus with reinforcement ratio as independent variable is fitted. Comparing with the regression equation of reinforced concrete test, the rationality of the formula is verified. Based on the elastic theory, the formula for calculating the composite elastic modulus of reinforced concrete is derived, and the regression equation is compared with the regression equation of the reinforced concrete test block and beam test. The analysis results show that the calculated results are in good agreement with each other, which provides a parameter basis for engineering design and subsequent finite element simulation analysis of turbine foundation. According to the above research on the beam structure of turbine foundation, The integral model of a steam turbine foundation was established by finite element simulation. The modal analysis of the turbine foundation structure was carried out, and the harmonic response and dynamic stiffness of the beam at the bearing seat were analyzed.
【學(xué)位授予單位】：北方工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU476.1;TM62

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 屈鐵軍;徐建;石云興;;基于有限元方法和測試結(jié)果確定鋼筋混凝土構(gòu)件的彈性模量[J];混凝土;2015年07期

2 屈鐵軍;徐榮桓;石云興;;配筋率對(duì)鋼筋混凝土構(gòu)件彈性模量影響的試驗(yàn)研究[J];混凝土;2014年09期

3 王猛;鄭梅生;田聯(lián)軍;蔣本浩;;隨機(jī)振動(dòng)試驗(yàn)法測定鋼絲繩的彈性模量[J];力學(xué)與實(shí)踐;2014年02期

4 孫慶;尹學(xué)軍;李汪繁;王秀瑾;王偉強(qiáng);谷朝紅;;不同基礎(chǔ)形式對(duì)大型核電半速機(jī)組軸系動(dòng)力特性的影響[J];動(dòng)力工程學(xué)報(bào);2013年09期

5 劉慶濤;李長冬;胡新麗;王亮清;雍睿;;鋼筋混凝土懸臂梁復(fù)合彈性模量研究[J];太原理工大學(xué)學(xué)報(bào);2012年06期

6 邵曉巖;周建章;尹學(xué)軍;屈鐵軍;;汽輪發(fā)電機(jī)組彈簧隔振基礎(chǔ)模型試驗(yàn)研究——?jiǎng)恿μ匦栽囼?yàn)[J];武漢大學(xué)學(xué)報(bào)(工學(xué)版);2011年S1期

7 黃秋紅;;撓度法測量金屬懸臂梁彈性模量[J];科技資訊;2011年28期

8 許海勇;陳龍珠;;鋼管水泥土圍護(hù)墻等效彈性模量的有限元計(jì)算[J];西北地震學(xué)報(bào);2011年03期

9 吳云章;兌關(guān)鎖;朱玉萍;;有效彈性模量微分法的一種近似解法[J];固體力學(xué)學(xué)報(bào);2011年03期

10 閆曉鵬;牛衛(wèi)晶;王志華;馬宏偉;;基于均勻化理論的混凝土等效彈性模量的數(shù)值模擬[J];太原理工大學(xué)學(xué)報(bào);2011年02期

相關(guān)博士學(xué)位論文 前1條

1 何曉婷;拉壓不同模量彈性結(jié)構(gòu)的非線性力學(xué)行為研究[D];重慶大學(xué);2007年

相關(guān)碩士學(xué)位論文 前2條

1 寧全潤;基于不同模量彈性理論帶裂鋼筋混凝土梁短期剛度研究[D];重慶大學(xué);2011年

2 潘志鵬;鋼筋混凝土等效材料的研究與應(yīng)用[D];哈爾濱工業(yè)大學(xué);2008年

，

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