以AP1000核反应堆屏蔽厂房结构为研究对象，在单一和序列型地震动作用下对屏蔽厂房的整体动力灾变行为进行损伤评估，在此基础上基于分区理念，将其沿高度方向分为9个环带区(BS-1, BS-2, MS-1~MS-7)、沿环带方向间隔15°划分24个子区(C1~C24)，在序列型设计和超设计地震作用下探讨了各精细化子区域的动力灾变行为和损伤发展。研究表明：屏蔽厂房结构在设计、超设计、甚至巨震作用下的损伤变形特征均以剪切型破坏为主，随PGA增大损伤首先向洞口所在高度的环带方向拓展、贯穿，随后沿高度向上下不断延伸，损伤程度以闸门洞口环带最为严重、其次为上部洞口环带、再次为基础区域和上下洞口之间区域、最后为顶部水箱区域；余震对主震后结构损伤的加剧效应仍集中在已损伤区，随地震动PGA增大加剧效应呈现先增长后下降的趋势；闸门洞口区域损伤直接影响屏蔽厂房的损伤发展，该区域的灾变行为宜采用损伤最大值描述，其余区域可采用损伤平均值描述，在设计中应有针对性地对闸门洞口采取加强处理措施。
Abstract
Taking the structure of the shield building of the AP1000 nuclear reactor as the research object, the damage assessment of the whole dynamic catastrophic behavior of the shield building is carried out under the action of single and sequential ground motions. Based on the concept of zoning, the shield building is divided into nine zones along the height direction (BS-1, BS-2, MS-1 ~ MS-7) and 24 sub-regions (C1 ~ C24) are divided with an interval of 15 ° along the ring direction. Under the action of sequence design and exceeding design earthquake, the dynamic catastrophic behavior and damage development of each refined sub-region are discussed in depth. The research shows that the damage and deformation characteristics of the shield building structure under the action of design, beyond design and even huge earthquake, are mainly shear-type damage. With the increase of PGA, the damage first extends to the ring belt direction of the height of the portal and then continues to extend up and down. The damage degree is the most serious in the ring belt of the gate portal, followed by the ring belt of the upper portal, and the base area and The area between the upper and lower openings, and finally the top water tank area; the aggravating effect of aftershock on the structural damage after the main earthquake is still concentrated in the damaged area, and the aggravating effect increases first and then decreases with the increase of ground motion PGA; the damage of the gate opening area directly affects the damage development of the shield plant, and the catastrophic behavior in this area should be described by the maximum damage value, and the rest areas can be described by the damage value The average value describes that the gate opening should be strengthened in the design.
关键词
序列型地震动 /
超设计地震 /
屏蔽厂房 /
动力灾变 /
损伤行为
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Key words
sequential ground motion /
beyond design basis earthquake /
shield building /
dynamic catastrophe /
damage behavior
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