【摘要】：汽輪發(fā)電機(jī)基礎(chǔ)作為汽輪機(jī)的支承結(jié)構(gòu)，結(jié)構(gòu)可靠對(duì)發(fā)電機(jī)組的安全運(yùn)行起著至關(guān)重要的作用，其抗震性能的優(yōu)劣直接關(guān)系到地震作用下核心設(shè)備能否保全以及電廠能否安全運(yùn)營(yíng)，因而好的基礎(chǔ)選型對(duì)結(jié)構(gòu)抵抗地震作用意義重大。本文對(duì)核電站汽輪發(fā)電機(jī)組彈簧隔振框架式基礎(chǔ)的抗震性能進(jìn)行了研究，論文主要內(nèi)容包括： （1）進(jìn)行了彈簧隔振元件的力學(xué)性能試驗(yàn)，包括隔振彈簧水平側(cè)向剛度測(cè)試和摩擦墊最大靜摩擦系數(shù)復(fù)核，為彈簧隔振基礎(chǔ)擬動(dòng)力試驗(yàn)1:8模型制作和有限元模型建立提供相應(yīng)參數(shù)。 （2）對(duì)彈簧隔振基礎(chǔ)1:8模型進(jìn)行了不同工況下的擬動(dòng)力試驗(yàn)，并對(duì)地震響應(yīng)信息如位移、力、鋼筋應(yīng)變等進(jìn)行了采集和計(jì)算，通過(guò)位移時(shí)程、加速度時(shí)程、層間位移角、恢復(fù)力時(shí)程、鋼筋應(yīng)變、滯回曲線以及裂縫開展等的分析研究，，表明隔振基礎(chǔ)在大震下仍然具有良好的抗震性能。 （3）利用LS-DYNA建立了包含箍筋的彈簧隔振基礎(chǔ)和常規(guī)基礎(chǔ)的精細(xì)化有限元模型，通過(guò)模態(tài)分析對(duì)模型的固有頻率和振型等動(dòng)力特性進(jìn)行了驗(yàn)證，確保有限元模型的準(zhǔn)確可靠；對(duì)彈簧隔振基礎(chǔ)與不含隔振彈簧的常規(guī)基礎(chǔ)進(jìn)行了對(duì)比分析，發(fā)現(xiàn)彈簧隔振基礎(chǔ)具有優(yōu)良的抗震性能，隔振彈簧作用顯著；通過(guò)變形及應(yīng)力云圖，對(duì)兩種基礎(chǔ)形式破壞模式進(jìn)行了簡(jiǎn)要分析。
[Abstract]:As the supporting structure of steam turbine, the foundation of turbogenerator plays an important role in the safe operation of generator set. Its seismic performance is directly related to the preservation of the core equipment and the safe operation of the power plant under the earthquake, so the good selection of foundation is of great significance to the earthquake resistance of the structure. In this paper, the seismic performance of the spring isolation frame foundation of a nuclear power plant turbogenerator is studied. The main contents of this paper are as follows: (1) the mechanical performance test of the spring vibration isolation element is carried out. The horizontal lateral stiffness test of the vibration isolation spring and the check of the maximum static friction coefficient of the friction pad provide the corresponding parameters for the 1:8 model making and the finite element model establishment for the quasi dynamic test of the spring isolation foundation. (2) the quasi dynamic test of spring vibration isolation foundation 1:8 model under different working conditions is carried out, and the seismic response information such as displacement, force, reinforcement strain are collected and calculated. The displacement time history, acceleration time history and interstory displacement angle are obtained and calculated. The analysis of the time history of restoring force, the strain of steel bar, the hysteretic curve and the crack development shows that the vibration isolation foundation still has good seismic performance under the strong earthquake. (3) the fine finite element model of spring isolation foundation and conventional foundation with stirrups is established by using LS-DYNA. The dynamic characteristics of the model, such as natural frequency and vibration mode, are verified by modal analysis. Ensure the accuracy and reliability of the finite element model; The spring isolation foundation is compared with the conventional foundation without vibration isolation spring. It is found that the spring isolation foundation has excellent seismic performance and the vibration isolation spring plays an important role. Through the deformation and stress cloud diagram, the failure modes of two basic forms are analyzed briefly.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU476

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