本文選題：彈簧隔振基礎(chǔ) + 凝汽器　； 參考：《北方工業(yè)大學(xué)》2017年碩士論文

【摘要】：隨著汽輪發(fā)電機(jī)的裝機(jī)容量的增大,支撐汽輪機(jī)的基礎(chǔ)結(jié)構(gòu)也變得復(fù)雜。以往的大型電廠汽機(jī)基礎(chǔ)的柱列多為兩列,但由于裝機(jī)容量的進(jìn)一步增大,汽輪機(jī)的設(shè)備和擾力都大幅度地增加,于是出現(xiàn)了局部將柱列改為四列的設(shè)計(jì)方案。由于結(jié)構(gòu)形式的變化,傳統(tǒng)的設(shè)計(jì)方法不能保證機(jī)組在地震發(fā)生時(shí)仍安全運(yùn)行,需做特殊研究。本文以2×1100MW汽輪發(fā)電機(jī)彈簧隔振基礎(chǔ)為原型,設(shè)計(jì)建造了柱網(wǎng)橫向加密的四列柱汽機(jī)彈簧隔振基礎(chǔ)的1:8縮尺模型,進(jìn)行了以下研究工作:一、通過多點(diǎn)激振試驗(yàn),得到了該汽機(jī)彈簧隔振基礎(chǔ)的動(dòng)力特性,包括自振頻率、振型以及阻尼比。特別是得到了凝汽器的低階典型振型,為更準(zhǔn)確地分析凝汽器的動(dòng)力響應(yīng)創(chuàng)造了條件。通過在ABAQUS軟件中建立該彈簧隔振基礎(chǔ)的數(shù)值模型以及同等條件的非隔振模型,對比兩種結(jié)構(gòu)的動(dòng)力特性,充分說明了彈簧隔振器對改善結(jié)構(gòu)動(dòng)力特性的重要作用。二、通過錘擊法對結(jié)構(gòu)橫梁進(jìn)行動(dòng)剛度測試,得到各軸承座處在25Hz土5%頻率范圍內(nèi)的動(dòng)剛度曲線。三、通過7度多遇烈度、基本烈度及罕遇烈度的擬動(dòng)力試驗(yàn),獲取結(jié)構(gòu)的地震響應(yīng)。其中包括:頂板的速度時(shí)程、加速度時(shí)程、恢復(fù)力時(shí)程、位移時(shí)程;柱頭、凝汽器及其他關(guān)鍵位置的位移時(shí)程;鋼筋的應(yīng)變時(shí)程以及裂縫分布與開展等。結(jié)果表明:各軸承座的動(dòng)剛度值均大于4×106kN/m,滿足廠家要求。在7度多遇烈度、基本烈度地震作用下,頂板的位移較小,鋼筋應(yīng)變遠(yuǎn)小于屈服應(yīng)變,層間位移角小于《建筑抗震設(shè)計(jì)規(guī)范》規(guī)定的鋼筋混凝土框架結(jié)構(gòu)彈性層間位移角限值,結(jié)構(gòu)基本處于彈性變形的范圍內(nèi)。對于7度罕遇工況,結(jié)構(gòu)表現(xiàn)出一定的彈塑性,鋼筋峰值應(yīng)變?nèi)晕催_(dá)到屈服應(yīng)變,層間位移角仍未達(dá)到彈塑性層間位移角限值。罕遇烈度地震作用下,柱網(wǎng)疏密變化處的3個(gè)柱子,變形遠(yuǎn)小于其他柱子,對結(jié)構(gòu)是有利的。該柱網(wǎng)加密的基礎(chǔ)設(shè)計(jì)符合《建筑抗震設(shè)計(jì)規(guī)范》標(biāo)準(zhǔn),柱網(wǎng)橫向加密,充分利用了連續(xù)梁受力特點(diǎn)以減少結(jié)構(gòu)中的彎矩,避免了兩個(gè)粗大角柱的柱網(wǎng)布置形式,結(jié)構(gòu)受力更均勻,并且為工藝上創(chuàng)造了靈活的空間。
[Abstract]:As the installed capacity of turbogenerator increases, the basic structure supporting steam turbine becomes complex. In the past, the columns of the turbine foundation of large power plants were mostly two columns, but because of the further increase of the installed capacity, the equipment and disturbance force of the steam turbine were greatly increased, so the design scheme of changing the columns into four columns appeared. Because of the change of structure form, the traditional design method can not guarantee the safe operation of the unit when the earthquake occurs, so special research is needed. In this paper, based on the spring isolation foundation of 2 脳 1100MW turbogenerator, the 1:8 scale model of the four-column turbine spring isolation foundation is designed and constructed. The following research work is carried out: first, through the multi-point exciting vibration test, The dynamic characteristics of the spring isolation foundation are obtained, including the natural vibration frequency, mode shape and damping ratio. In particular, the low order typical vibration modes of the condenser are obtained, which creates conditions for more accurate analysis of the dynamic response of the condenser. By establishing the numerical model of the spring vibration isolation foundation and the non-vibration isolation model under the same conditions in ABAQUS software, the dynamic characteristics of the two structures are compared, and the important role of the spring vibration isolator in improving the dynamic characteristics of the structure is fully illustrated. Secondly, the dynamic stiffness curves of the bearing blocks in the 5% frequency range of 25Hz soil are obtained by measuring the dynamic stiffness of the structural beams by hammering method. Thirdly, the seismic response of the structure is obtained by quasi dynamic test of 7 degree frequently-encountered intensity, basic intensity and rare intensity. These include: velocity time history, acceleration time history, recovery force time history, displacement time history of roof, displacement time history of cylinder, condenser and other key positions, strain history of steel bar, distribution and development of cracks, etc. The results show that the dynamic stiffness of each bearing seat is more than 4 脳 10 6 KN / m, which meets the requirements of the manufacturer. The displacement of roof is smaller, the strain of reinforcing bar is much less than yield strain, and the displacement angle of story is less than the limit of elastic displacement angle of reinforced concrete frame structure stipulated in the Code for Seismic Design of buildings under the earthquake intensity of 7 degrees and basic intensity. The structure is basically in the range of elastic deformation. For 7 degree rare cases, the structure shows a certain elastoplasticity, the peak strain of steel bar is still not up to yield strain, and the interstory displacement angle is still not up to the limit value of elastic-plastic interlayer displacement angle. Under the action of rare earthquake intensity, the deformation of the three columns in the dense change of the column network is much smaller than that of the other columns, which is beneficial to the structure. The foundation design of the column net is in accordance with the Standard of Building aseismic Design Code, and the column network is transversely encrypted, which makes full use of the stress characteristics of continuous beam to reduce the bending moment in the structure, and avoids the layout of the column net of two coarse corner columns. The structure forces more evenly, and creates the flexible space for the craft.
【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)】：TM62;TM311

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 彭凌云;杲曉龍;李紅星;蔡建平;;某豎向框排架結(jié)構(gòu)中排架部分層間位移角限值的研究[J];工業(yè)建筑;2016年10期

2 冉田苒;王濤;周惠蒙;邱法維;;一種無條件穩(wěn)定的顯式數(shù)值積分算法[J];防災(zāi)減災(zāi)工程學(xué)報(bào);2016年01期

3 徐鑒;;振動(dòng)控制研究進(jìn)展綜述[J];力學(xué)季刊;2015年04期

4 徐建;胡明yN;;工業(yè)工程振動(dòng)控制概念設(shè)計(jì)方法[J];地震工程與工程振動(dòng);2015年05期

5 徐建;尹學(xué)軍;陳騮;;工業(yè)工程振動(dòng)控制關(guān)鍵技術(shù)研究進(jìn)展[J];建筑結(jié)構(gòu);2015年19期

6 陳U，

本文編號(hào)：1902842