强震作用下核安全壳结构参数时变特性及抗震裕度研究

项目名称： 强震作用下核安全壳结构参数时变特性及抗震裕度研究

项目编号： No.51478168

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 建筑环境与结构工程学科

项目作者： 薛志成

作者单位： 黑龙江科技大学

项目金额： 82万元

中文摘要： 以我国核电工程结构抗震裕度与安全评估为应用背景，采用模型试验、现场实测和数值模拟相结合的方法，研究核岛区近场强地震动特征、核安全壳非线性本构模型及考虑动接触问题和粘弹性边界的有限元并行计算、核安全壳物理及模态参数的时变特征及其关系、核安全壳抗震裕度，揭示在强震作用下核安全壳参数时变规律及破坏机理。针对近场强地震动的科学问题，采用HHT、短时FFT、扩展的卡尔曼滤波与移动谱结合识别其特征参数，为核安全壳抗震分析提供合理的地震动参数。以核安全壳抗震裕度评估为目标，研究近场强地震动作用下核安全壳的非线性反应，核安全壳振动台试验，核安全壳材料强度等物理与模态参数之间的关系，揭示核安全壳参数的时变规律与破坏机理，给出核安全壳结构在超设计基准地震事件作用下的抗震裕度。以某在役核电厂为依托，对其核安全壳进行现场振动测试，识别其参数时变特征，并对其进行抗震裕度评估，为我国核电厂安全运行提供技术支撑。

中文关键词： 核安全壳；抗震裕度；振动台试验；数值模拟；结构损伤识别

英文摘要： Taking seismic margin and security protection of China's nuclear power engineering structures as an application background, the methods of shaking table model test, field measurement and numerical simulation will be utilized in this project to investigate the problems including characteristics of in the near-field ground motions in the field of nuclear island, nonlinear constitutive model and parallel computing seismic response analysis considering dynamic contact problem and viscous-spring artificial boundaries of nuclear containment, time-variant characteristics of physical parameters and modal parameter of nuclear containment, seismic margin of nuclear containment. Consequently, the damage mechanism and the time-varying process of parameters of the nuclear reactor building under strong earthquake can be revealed in this project. The results will provide a scientific basis for the construction of Earthquake Safety and Disaster Prevention and seismic performance evaluation of Chinese Nuclear Power Engineering. In connection with the scientific issues for the near-field strong ground motion, by the combination methods of HHT, short-time FFT and extended Kalman filter with mobile spectrum respectively, the characteristic parameters of ground motion are identified so that it can provide a reasonable ground motion parameters for seismic analysis of the nuclear island. Considering time-varying characteristics of parameters of nuclear containment as study objects, Nonlinear seismic response of nuclear containment parameters to change the law for the goal of near-field ground motions nuclear containment, nuclear safety shell material non-linear restoring force model, nuclear containment shaking table test, the following issues will be studied including nonlinear seismic response of nuclear containment under the input of near-field ground motions, nonlinear hysteresis curve model, shaking table model test, and then the time-varying charactieristics of the model parameters of the nuclear containment can be revealed, and furthermore the floor response spectrum of nuclear containment would be given. And then the site vibration testing of nuclear containment structure will be carried out, time-varying parameters of nuclear containment structure are identified by using the obtained data justnow on the structure. The quantitative relationship of the failure mechanism of structural damage and time-varying parameters of the structure would be summarized. In the end, a method of seismic margin assessment for nuclear containment can be proposed not to depend on the original information of structure.

英文关键词： nuclear containment;seismic margin;shaking table test;numerical simulation;structural damage identification