沖擊荷載作用下安全殼的破壞機理研究
發(fā)布時間：2018-10-29 17:56
【摘要】：核能的不斷發(fā)展促使了核電站的建設(shè)逐漸增多，核電站作為國家重要的土木工程基礎(chǔ)設(shè)施極有可能遭受飛機、導彈和其他飛行物的撞擊，核電站破壞造成的核泄漏事故將會對周圍的居民和建筑設(shè)施造成災(zāi)難性的后果。雖然沖擊荷載屬于偶然荷載，發(fā)生的概率理論上很小，但是近年來由于戰(zhàn)爭、恐怖襲擊事件、施工引起的失誤、風致飛行物等原因，沖擊事件發(fā)生的概率不斷增加。目前國內(nèi)外有不少對于核電站抗沖擊的研究，但在第三代非能動AP1000核電站安全殼中的研究并不多，且尚未提出一套系統(tǒng)的分析方法。基于以上問題，本文提出了安全殼在沖擊荷載作用下的沖擊響應(yīng)分析方法，從安全殼的失效模式、失效機理和失效規(guī)律三個方面分別展開了深入的研究，具體內(nèi)容如下： 1、研究了沖擊荷載作用下安全殼沖擊響應(yīng)的分析方法，確定了安全殼沖擊響應(yīng)研究的特征指標，包括安全殼的特征響應(yīng)和荷載作用。探討了沖擊響應(yīng)分析流程，包括確定接觸算法、建立動力平衡方程和求解動力平衡方程三方面。建立了安全殼精細化數(shù)值模型，并通過典型算例分析了沖擊荷載作用下安全殼的動力響應(yīng)特點。 2、根據(jù)沖擊荷載作用下安全殼的不同失效特點，定義了沖擊荷載作用下安全殼的四種失效模式：局部凹陷、混凝土剝落、鋼筋斷裂和穿透破壞，并分析了每一種失效模式的沖擊響應(yīng)特征。詳細描述了安全殼的沖擊全過程，根據(jù)兩個關(guān)鍵時刻，將失效的全過程劃分成了三個階段，從能量的角度揭示了每一種失效模式的失效機理。 3、確定了沖擊荷載作用下安全殼失效規(guī)律的分析方案，通過對沖擊模型展開大量參數(shù)分析繪制了失效分布圖，得到了失效模式與沖擊物初始能量之間的對應(yīng)關(guān)系。比較并分析沖擊位置沿高度變化時失效分布的變化，確定了安全殼的較不利沖擊位置；此外，，考慮了沖擊角度對失效規(guī)律的影響，確定了安全殼的較不利沖擊角度。
[Abstract]:The continuous development of nuclear energy has led to a gradual increase in the construction of nuclear power plants, which, as an important civil engineering infrastructure in the country, are at great risk of being hit by aircraft, missiles and other flying objects. A nuclear leak caused by a nuclear plant damage could have disastrous consequences for nearby residents and construction facilities. Although the impact load belongs to accidental load and the probability of occurrence is very small theoretically the probability of impact event has been increasing in recent years due to war terrorist attack misstep caused by construction and wind-induced flying object. At present, there are many researches on shock resistance of nuclear power plants at home and abroad, but there are few researches in the third generation passive AP1000 nuclear power plant containment, and a set of systematic analysis method has not been put forward. Based on the above problems, the impact response analysis method of containment under impact load is put forward in this paper. The failure mode, failure mechanism and failure law of containment are studied in depth. The main contents are as follows: 1. The analysis method of the impact response of containment under impact load is studied, and the characteristic indexes of the research on impact response of containment are determined, including the characteristic response of containment and the effect of load. The flow of shock response analysis is discussed, including determining contact algorithm, establishing dynamic equilibrium equation and solving dynamic equilibrium equation. The fine numerical model of containment is established, and the dynamic response of containment under impact load is analyzed by a typical example. 2. According to the different failure characteristics of containment under impact load, four failure modes of containment under impact load are defined: local depression, concrete spalling, steel bar fracture and penetrating failure. The impact response characteristics of each failure mode are analyzed. The whole process of impact of containment is described in detail. According to two critical moments, the whole process of failure is divided into three stages, and the failure mechanism of each failure mode is revealed from the point of view of energy. 3. The analysis scheme of containment failure law under impact load is determined. The failure distribution diagram is drawn by analyzing a large number of parameters of impact model, and the corresponding relationship between failure mode and initial energy of impact material is obtained. By comparing and analyzing the change of failure distribution when the impact position changes along the height, the unfavorable impact position of containment is determined, and the unfavorable impact angle of containment is determined by considering the influence of impact angle on failure law.
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TU312.3;TU33
本文編號：2298382
[Abstract]:The continuous development of nuclear energy has led to a gradual increase in the construction of nuclear power plants, which, as an important civil engineering infrastructure in the country, are at great risk of being hit by aircraft, missiles and other flying objects. A nuclear leak caused by a nuclear plant damage could have disastrous consequences for nearby residents and construction facilities. Although the impact load belongs to accidental load and the probability of occurrence is very small theoretically the probability of impact event has been increasing in recent years due to war terrorist attack misstep caused by construction and wind-induced flying object. At present, there are many researches on shock resistance of nuclear power plants at home and abroad, but there are few researches in the third generation passive AP1000 nuclear power plant containment, and a set of systematic analysis method has not been put forward. Based on the above problems, the impact response analysis method of containment under impact load is put forward in this paper. The failure mode, failure mechanism and failure law of containment are studied in depth. The main contents are as follows: 1. The analysis method of the impact response of containment under impact load is studied, and the characteristic indexes of the research on impact response of containment are determined, including the characteristic response of containment and the effect of load. The flow of shock response analysis is discussed, including determining contact algorithm, establishing dynamic equilibrium equation and solving dynamic equilibrium equation. The fine numerical model of containment is established, and the dynamic response of containment under impact load is analyzed by a typical example. 2. According to the different failure characteristics of containment under impact load, four failure modes of containment under impact load are defined: local depression, concrete spalling, steel bar fracture and penetrating failure. The impact response characteristics of each failure mode are analyzed. The whole process of impact of containment is described in detail. According to two critical moments, the whole process of failure is divided into three stages, and the failure mechanism of each failure mode is revealed from the point of view of energy. 3. The analysis scheme of containment failure law under impact load is determined. The failure distribution diagram is drawn by analyzing a large number of parameters of impact model, and the corresponding relationship between failure mode and initial energy of impact material is obtained. By comparing and analyzing the change of failure distribution when the impact position changes along the height, the unfavorable impact position of containment is determined, and the unfavorable impact angle of containment is determined by considering the influence of impact angle on failure law.
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TU312.3;TU33
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本文編號：2298382
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