冲击荷载作用下安全壳的破坏机理研究
发布时间：2018-10-29 17:56
【摘要】：核能的不断发展促使了核电站的建设逐渐增多，核电站作为国家重要的土木工程基础设施极有可能遭受飞机、导弹和其他飞行物的撞击，核电站破坏造成的核泄漏事故将会对周围的居民和建筑设施造成灾难性的后果。虽然冲击荷载属于偶然荷载，发生的概率理论上很小，但是近年来由于战争、恐怖袭击事件、施工引起的失误、风致飞行物等原因，冲击事件发生的概率不断增加。目前国内外有不少对于核电站抗冲击的研究，但在第三代非能动AP1000核电站安全壳中的研究并不多，且尚未提出一套系统的分析方法。基于以上问题，本文提出了安全壳在冲击荷载作用下的冲击响应分析方法，从安全壳的失效模式、失效机理和失效规律三个方面分别展开了深入的研究，具体内容如下： 1、研究了冲击荷载作用下安全壳冲击响应的分析方法，确定了安全壳冲击响应研究的特征指标，包括安全壳的特征响应和荷载作用。探讨了冲击响应分析流程，包括确定接触算法、建立动力平衡方程和求解动力平衡方程三方面。建立了安全壳精细化数值模型，并通过典型算例分析了冲击荷载作用下安全壳的动力响应特点。 2、根据冲击荷载作用下安全壳的不同失效特点，定义了冲击荷载作用下安全壳的四种失效模式：局部凹陷、混凝土剥落、钢筋断裂和穿透破坏，并分析了每一种失效模式的冲击响应特征。详细描述了安全壳的冲击全过程，根据两个关键时刻，将失效的全过程划分成了三个阶段，从能量的角度揭示了每一种失效模式的失效机理。 3、确定了冲击荷载作用下安全壳失效规律的分析方案，通过对冲击模型展开大量参数分析绘制了失效分布图，得到了失效模式与冲击物初始能量之间的对应关系。比较并分析冲击位置沿高度变化时失效分布的变化，确定了安全壳的较不利冲击位置；此外，，考虑了冲击角度对失效规律的影响，确定了安全壳的较不利冲击角度。
[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.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU312.3;TU33
本文编号：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.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU312.3;TU33
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本文编号：2298382
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