序列型地震作用下AP1000核反应堆屏蔽厂房损伤灾变精细化分析  

Refined analysis for damage catastrophe of shielding building of AP1000 nuclear reactor under sequence earthquake

作　　者：汪大洋[1,2] 包嗣海 陈婉若 朱勇[1,2] 张永山[1,2] WANG Dayang;BAO Sihai;CHEN Wanruo;ZHU Yong;ZHANG Yongshan(School of Civil Engineering,Guangzhou University,Guangzhou 510006,China;Research Center for Structural Mechanical Analysis and Testing,Guangzhou University,Guangzhou 510006,China)

机构地区：[1]广州大学土木工程学院,广州510006 [2]广州大学结构力学分析与测试研究中心,广州510006

出　　处：《振动与冲击》2022年第1期169-179,共11页Journal of Vibration and Shock

基　　金：国家自然科学基金(51878191,51778162);广东省自然科学基金(2020A15150010993,2015A030313511)。

摘　　要：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。Here,taking the shield building structure of AP1000 nuclear reactor as the study object,its overall dynamic catastrophe behavior was evaluated under the action of single and sequential ground motions.Then,based on zoning concept,it was divided into 9 annular zones including BS-1,BS-2,MS-1—MS-7 along its height direction,and 24 sub-zones of C1—C24 with an interval of 15°along the annular direction.The dynamic catastrophe behavior and damage development of each refined sub-region were explored under actions of sequential design earthquake and super design one.The study showed that damage and deformation characteristics of the shield plant structure under actions of design earthquake,super design one and even giant one are mainly shear failure;with increase in PGA,the damage firstly expands and penetrates along the ring belt at the height of an opening,and then extends up and down along the height;the damage degree is the most serious at the gate opening ring belt,followed by the upper opening ring belt,and the third one is the foundation area and the area between upper and lower openings,and the last one is the top water tank area;the aggravating effect of aftershocks on structural damage after main earthquake is still concentrated in the damaged area,with increase in PGA of ground motion,the aggravating effect increases firstly and then decreases;the damage at the gate opening area directly affects damage development of the shield building,the catastrophic behavior at this area should be described with the maximum damage value,and the average damage value can be used to describe that of other areas;targeted enhancement treatment measures should be taken for the gate opening in 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 

分 类 号：TH352.1[机械工程—机械制造及自动化]