本文選題：核電站　切入點：安全殼　出處：《哈爾濱工業(yè)大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：人類對于資源大幅度的需求對核能源的快速發(fā)展起到推動作用。核能源作為污染低、能量高效的能量資源受到了國內(nèi)外廣泛青睞。然而,近幾年核事故帶給人類社會的傷害也不容忽視,探究核事故的誘因,地震災(zāi)害是一個重要的因素。盡管地震偶然發(fā)生,但是悉數(shù)近幾年我國發(fā)生的大震,災(zāi)后的景象依然觸目驚心。目前國內(nèi)外很多學(xué)者針對核電站的地震作用下的動力響應(yīng)和抗震性能的評估已做出很多相關(guān)研究,但是在考慮土-結(jié)構(gòu)相互作用下的建筑結(jié)構(gòu)的地震響應(yīng)分析時,一般假定輸入的地震波是垂直作用在建筑模型底部的剪切地震波或者是壓縮地震波。然而由研究可知只有當(dāng)?shù)卣鸩ㄔ淳嚯x結(jié)構(gòu)場地非常遠(yuǎn)時,地震波經(jīng)過不斷折射,垂直入射的假定才是能夠接受的。因此當(dāng)震源距離結(jié)構(gòu)場地比較近時,不能假定它的入射方向是垂直的,而是以某個入射角度傳播到場地結(jié)構(gòu)上的,此時的地震動就表現(xiàn)出了空間變化的特性。由于地震波斜入射情況產(chǎn)生的地表運動的非一致性變化,會對核電站、水壩、橋隧以及地鐵站等大型建筑物的地震動力響應(yīng)造成很大的影響,因此當(dāng)近場發(fā)生較大地震時,為了保證這些大型建筑結(jié)構(gòu)在地震作用下的安全性,必須在抗震結(jié)構(gòu)設(shè)計中考慮地震波的入射角度問題。本文主要研究內(nèi)容如下:1、建立了土體模型,并且在土體黏彈性邊界的基礎(chǔ)上運用波場分解原理實現(xiàn)地震動到黏彈性邊界上等效地震荷載作用力的轉(zhuǎn)化,通過數(shù)值算例驗證了波場分解輸入方法的正確性。2、基于大型通用有限元軟件ABAQUS建立精細(xì)化核電站安全殼結(jié)構(gòu)的數(shù)值模型,在考慮土-結(jié)構(gòu)相互作用下完成核安全殼的SSI模型建立。3、基于建立的核安全殼的SSI模型,選取P波和SV波兩種類型的地震波以不同的入射角度輸入來對核安全殼結(jié)構(gòu)進行地震動力響應(yīng)分析,研究得出一些重要結(jié)論:在地震波斜入射條件下核安全殼的動力響應(yīng)與地震波垂直入射下對比,核安全殼的地震動動力反應(yīng)有明顯區(qū)別,斜入射條件下對結(jié)構(gòu)更不利。因此當(dāng)對核安全殼進行安全評估以及結(jié)構(gòu)設(shè)計時,有必要去考慮地震波斜入射帶來的影響。
[Abstract]:The rapid development of nuclear energy is promoted by the great demand of human resources. Nuclear energy, as a kind of energy resource with low pollution and high energy efficiency, is widely favored at home and abroad. The damage caused by nuclear accidents to human society in recent years cannot be ignored. Exploring the causes of nuclear accidents, earthquake disasters are an important factor. Although earthquakes happen by chance, all the major earthquakes that have occurred in China in recent years, The scene after the disaster is still shocking. At present, many scholars at home and abroad have done a lot of relevant research on the evaluation of dynamic response and seismic performance of nuclear power plants under earthquake. However, when considering the seismic response of a building structure under soil-structure interaction, It is generally assumed that the input seismic waves are shear or compressed seismic waves acting perpendicular to the bottom of the building model. However, the study shows that the seismic waves refraction continuously only when the seismic wave source is very far from the structural site. The assumption of vertical incidence is acceptable. Therefore, when the source is close to the site of the structure, it cannot be assumed that the direction of incidence is vertical, but propagates to the site structure at a certain incidence angle. At this point, the ground motion shows the characteristics of spatial variation. Because of the inconsistency of the ground motion caused by the oblique incidence of seismic waves, it will affect the nuclear power plant, the dam, The seismic dynamic response of large buildings, such as bridges, tunnels and subway stations, has a great impact, so when a large earthquake occurs in the near field, in order to ensure the safety of these large building structures under earthquake, The incident angle of seismic wave must be considered in the design of seismic structure. The main contents of this paper are as follows: 1. The soil model is established. On the basis of viscoelastic boundary of soil mass, the equivalent seismic load force is transformed from ground motion to viscoelastic boundary by using wave field decomposition principle. The correctness of the wave field decomposition input method is verified by a numerical example. The numerical model of elaborate containment structure of nuclear power station is established based on the large-scale general finite element software ABAQUS. Under the consideration of soil-structure interaction, the SSI model of nuclear safety shell is built. 3, based on the SSI model of nuclear safety shell, Two types of seismic waves, P wave and SV wave, are selected to analyze the seismic dynamic response of nuclear safety shell structure with different incident angles. Some important conclusions are drawn: the dynamic response of the nuclear safety shell under the condition of oblique incidence of seismic wave is obviously different from the dynamic response of the nuclear safety shell under the vertical incidence of the seismic wave. Therefore, it is necessary to consider the influence of oblique incidence of seismic waves when evaluating the safety of nuclear safety shells and structural design.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TL364.3;TU311.3

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本文編號：1593323