不同场地条件下某新型核电厂房的地震响应试验研究

发布时间：2018-11-19 12:25

【摘要】：土-结构相互作用是准确模拟核电厂结构、附着系统和组件地震响应的重要因素。使用振动台多功能叠层剪切土箱模拟土体边界条件,对某新型核电厂房进行1:25缩尺模型地震模拟振动台试验。试验选取10组水平加速度地震动记录,按照运行安全地震动(OBE)0.15g、极限安全地震动(SSE)0.30g和超设计基准地震动(ULE)0.75g作为输入,研究不同地震动强度引起的场地土非线性反应,以及对楼层加速度响应的影响规律;该模型土-结构相互作用振动台试验表明,尽管在基岩场地上,场地仍然对结构的地震效应造成明显的放大作用,在OBE、SSE和ULE工况下,场地动力效应放大倍数分别为3.13、2.1和1.19,由于土体逐渐进入了非线性状态,这种放大作用随着输入地震动强度的增强而变小。因此,建议对基岩场地的条件进行界定,并建议在任何条件下均需要考虑土-结构相互作用的影响,特别是在对核电厂设备、管道抗震设计和地震裕度评估时,不考虑土-结构相互作用将造成评估结果偏小。
[Abstract]:Soil-structure interaction is an important factor in accurately simulating the seismic response of nuclear power plant structures, attached systems and components. Using multifunctional laminated shear soil box of shaking table to simulate soil boundary condition, the shaking table test of 1:25 scale model earthquake simulation was carried out on a new nuclear power plant building. Ten groups of horizontal acceleration ground motion records were selected. According to the operating safety ground motion (OBE) 0.15g, the limit safe ground motion (SSE) 0.30g and the super-design reference ground motion (ULE) 0.75g as input, The nonlinear response of ground soil caused by different ground motion intensity and its influence on the acceleration response of floor are studied. The shaking table test of soil-structure interaction in this model shows that although the site still exerts a significant magnification effect on the seismic effect of the structure on the bedrock site, under OBE,SSE and ULE conditions, The magnification times of site dynamic effect are 3.13 ~ 2. 1 and 1.19 respectively. As the soil gradually enters into a nonlinear state, the amplification becomes smaller with the increase of the intensity of the input ground motion. Therefore, it is recommended that the conditions of the bedrock site be defined and that the influence of soil-structure interaction should be taken into account under all conditions, especially in the case of nuclear power plant equipment, pipeline seismic design and seismic margin assessment, The assessment results will be small if soil-structure interaction is not taken into account.
【作者单位】：中国地震灾害防御中心;中国地震局工程力学研究所中国地震局地震工程与工程振动重点实验室;
【分类号】：TU317

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