地震动速度脉冲对高温气冷堆核电厂地震反应的影响

Influence of near-fault velocity pulse on the seismic response of high temperature gas cooled reactor nuclear power plant

为探讨近断层地震动的速度脉冲对结构抗震能力的影响特征,以某高温气冷堆核电厂结构为研究对象,利用有限元软件建立线性三维模型,选择4组具有速度脉冲特性的近断层地震动加速度记录及人工模拟的具有相同加速度反应谱而无速度脉冲的地震动时程分别作为地震动输入,对模型进行动力时程分析,对比在有、无速度脉冲地震动作用下模型的地震反应。研究发现,虽然反应过程中结构仍处于弹性阶段但是地震动的速度脉冲对结构的位移反应具有一定的不利影响,这一点与已有的基本认识不同。因此对于需要安装对位移反应较为敏感设备的高温气冷堆核电厂房,应充分关注地震动速度脉冲对结构反应的影响。

To find out the effect of the velocity pulse of near-fault ground motions on the structural shock resistance, we simulated the seismic responses using three dimensional finite element model for high temperature gas-cooled reactor nuclear power plant, in which four strong motion records with the velocity pulse and the corresponding synthetic time histories with same response spectra and without velocity pulse were used as ground motion inputs. Our test results show that the seismic responses of the high temperature gas cooled reactor nuclear power plant to ground motions with velocity pulse are greater than those without velocity pulse, and the ground motions with velocity pulse can have strong unfavorable effect on seismic displacement responses of the high temperature gas-cooled reactor nuclear power plant. If the installed equipment is sensitive to the displacement response, the designers should focus great concern on the effect of the velocity pulse on seismic displacement responses of the high temperature gas cooled reactor nuclear power plant.