本文選題：汽輪機(jī)基礎(chǔ) + 動(dòng)力特性��； 參考：《北方工業(yè)大學(xué)》2017年碩士論文

【摘要】：作為電力系統(tǒng)的核心,發(fā)電廠屬于乙類抗震設(shè)防建筑,即在地震發(fā)生時(shí)其使用功能不能中斷或者需要盡快恢復(fù)的建筑。汽輪發(fā)電機(jī)基礎(chǔ)是發(fā)電廠承載汽輪發(fā)電機(jī)組的結(jié)構(gòu),其設(shè)計(jì)不僅要滿足結(jié)構(gòu)強(qiáng)度的要求還要滿足設(shè)備安裝的空間需求。鑒于其重要性及結(jié)構(gòu)的復(fù)雜性和特異性,有必要對(duì)其抗震性能進(jìn)行深入研究,進(jìn)而為此類特殊復(fù)雜結(jié)構(gòu)的創(chuàng)新設(shè)計(jì)與選型改進(jìn)提供一定的參考。本文以某1000MW發(fā)電廠汽輪發(fā)電機(jī)基礎(chǔ)為原型,依據(jù)相似定理,設(shè)計(jì)建造了 1:10的縮尺試驗(yàn)?zāi)Ｐ?并且對(duì)此汽輪發(fā)電機(jī)基礎(chǔ)模型進(jìn)行了以下試驗(yàn)研究:(1)對(duì)結(jié)構(gòu)模型進(jìn)行了動(dòng)力特性試驗(yàn),得到了結(jié)構(gòu)振型、自振頻率及阻尼比,分析了自振頻率分布和振型特點(diǎn)。運(yùn)用錘擊法對(duì)汽輪機(jī)基礎(chǔ)軸承支座處橫梁進(jìn)行了動(dòng)剛度測試,驗(yàn)證了軸承支座在汽機(jī)動(dòng)荷載作用下的運(yùn)行穩(wěn)定性。(2)對(duì)基礎(chǔ)模型結(jié)構(gòu)分別進(jìn)行了 8度多遇和8度罕遇兩個(gè)工況的擬動(dòng)力試驗(yàn),得到結(jié)構(gòu)在地震作用下的響應(yīng),包括位移、加速度、鋼筋應(yīng)變、層間位移角及恢復(fù)力-位移曲線等一系列的抗震性能指標(biāo)。(3)對(duì)基礎(chǔ)模型結(jié)構(gòu)進(jìn)行了擬靜力試驗(yàn),對(duì)模型結(jié)構(gòu)施加低周往復(fù)荷載,直到模型結(jié)構(gòu)完全破壞。研究了模型結(jié)構(gòu)在低周往復(fù)荷載作用下的破壞過程、塑性鉸出現(xiàn)的位置、滯回曲線、骨架曲線、延性系數(shù)、極限承載力、剛度退化等抗震性能。本文對(duì)汽輪發(fā)電機(jī)基礎(chǔ)的自振特性及抗震性能做了較全面的研究,通過試驗(yàn)分析可以得出,該汽輪機(jī)基礎(chǔ)具有較好的抗震性能。研究結(jié)果可供地震區(qū)同類汽輪機(jī)基礎(chǔ)做抗震設(shè)計(jì)時(shí)參考。
[Abstract]:As the core of power system, power plant belongs to class B seismic fortification building, that is, the building whose function can not be interrupted or needs to be restored as soon as possible when the earthquake occurs. The turbogenerator foundation is the structure of the power plant bearing turbine-generator unit. Its design not only meets the requirements of the structural strength but also meets the space requirement of the installation of the equipment. In view of its importance and the complexity and specificity of the structure, it is necessary to conduct a deep study on its seismic performance, thus providing a certain reference for the innovative design and type selection improvement of this kind of special complex structure. Based on the prototype of turbogenerator foundation in a 1000MW power plant, a 1:10 scale test model is designed and constructed according to the similarity theorem. The following experiments are carried out on the turbogenerator foundation model: 1) the dynamic characteristics of the structure model are tested, and the vibration mode, natural vibration frequency and damping ratio are obtained, and the distribution and characteristics of the natural vibration frequency are analyzed. The dynamic stiffness of the crossbeam at the bearing support of the basic bearing of steam turbine was measured by hammering method. The stability of bearing under the action of steam maneuvering load is verified. The quasi dynamic tests of the foundation model structure are carried out under two working conditions of 8 degree frequent and 8 degree rare, respectively, and the response of the structure under earthquake action, including displacement, is obtained. A series of seismic performance indexes, such as acceleration, reinforcement strain, interstory displacement angle and restoring force-displacement curve, are tested on the foundation model structure under low cycle reciprocating load until the model structure is completely destroyed. The failure process of model structure under low cycle reciprocating load, the location of plastic hinge, hysteretic curve, skeleton curve, ductility coefficient, ultimate bearing capacity and stiffness degradation are studied. In this paper, the natural vibration characteristics and seismic performance of turbogenerator foundation are studied comprehensively, and the experimental results show that the turbine foundation has better seismic performance. The results can be used as reference for seismic design of the same steam turbine foundation in earthquake area.
【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;TM621

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本文編號(hào)：1814022