Influence of near-fault velocity pulse on the seismic response of high temperature gas cooled reactor nuclear power plant
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摘要: 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。Abstract: 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.
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图 1 高温气冷堆核电厂剖面示意图
Figure 1. Sketch section of high temperature gas cooled reactor nuclear power plant
图 3 速度脉冲型地震动记录加速度时程与速度时程
Figure 3. Acceleration and velocity time histories of the ground motions with velocity pulse
图 4 人工地震动的加速度和速度时程
Figure 4. Acceleration and velocity time histories of the artificial ground motion
表 1 前10阶的自振周期
Table 1. The first ten order vibration period
振型 第1阶 第2阶 第3阶 第4阶 第5阶 第6阶 第7阶 第8阶 第9阶 第10阶 T/s 0.287 0.203 0.196 0.152 0.142 0.141 0.138 0.133 0.124 0.118 
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表 2 近断层速度脉冲型地震动记录参数
Table 2. Parameters of the near-fault ground motions with velocity pulse
代号 地震名称 震级 台站 分量 场地 t/s A1 CHI-CHI(1999) 7.6 36号台站 compEW D 40.96 A2 Imperial Valley(1979) 6.5 E04 compSN B/C 20.48 A3 CHI-CHI(1999) 7.6 TCU75 compEW D 40.96 A4 CHI-CHI(1999) 7.6 TCU129 compEW D 40.96
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表 3 顶层位移反应最大值xt
Table 3. Maximum displacement response of top floor
人工地震 xt/mm η/% 有速度脉冲 人工合成1 人工合成2 人工合成3 人工合成4 人工合成均值 A1组 3.81 3.51 3.31 3.52 3.72 3.51 92 A2组 3.07 2.84 2.56 2.93 2.86 2.80 91 A3组 3.29 2.97 2.46 2.93 2.68 2.76 84 A4组 3.30 2.65 2.74 2.47 2.34 2.55 77 均值 3.37 2.99 2.77 2.96 2.90 2.91 86
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