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以某核电站厂房隔震结构设计为例,针对铅芯橡胶支座阻尼、屈服前刚度值以及隔震结构偏心等三类参数分别进行了隔震结构动力响应的敏感性分析,分析结果表明,隔震层阻尼大小对于隔震结构位移的影响程度远大于对加速度响应的影响,工程设计中应考虑隔震装置阻尼取值的多种不确定性因素;对于文中核岛厂房所采用的隔震设计方案及计算模型,单一考虑屈服前刚度取值在一定范围内变化,其对隔震结构水平向加速度响应和峰值位移几乎无影响,但还应综合考虑屈服力等其他参数的影响;上部结构自身的偏心与否对隔震结构的动力响应影响很小,而隔震层偏心虽然对上部结构的加速度响应影响很小,但其对位移响应的影响则较为敏感,工程设计中应特别关注隔震层偏心问题。
Taking the isolation structure design of a nuclear power plant as an example, the sensitivity analysis of the dynamic response of the isolated structure is carried out respectively according to the damping of the lead rubber bearing, the stiffness value before yielding and the eccentricity of the isolation structure. The analysis results show that, The influence of the damping layer size on the displacement of the isolation structure is far greater than that of the acceleration response. Various uncertain factors should be considered in engineering design for the damping value of the isolation device. For the seismic isolation design Solution and calculation model, considering the value of pre-yield stiffness changing within a certain range, it has almost no effect on the horizontal acceleration response and peak displacement of isolation structure. However, other parameters such as yield strength should also be considered synthetically. The superstructure itself The eccentricity or not has little effect on the dynamic response of the isolated structure, while the eccentricity of the seismic isolation layer has little influence on the acceleration response of the superstructure, but it is more sensitive to the displacement response. In engineering design, special attention should be paid to the isolation Layer eccentric problem.