非基岩核电厂结构地震响应振动台试验研究

Shaking Table Test for Evaluation of Seismic Behavior of Nuclear Power Plants on Non-Rock Site

为研究在非基岩场地条件下核电厂结构的适用性和地震响应特征,以CAP1400型核电厂结构为例,开展非基岩场地核电厂结构振动台试验。结果表明:模型场地对各方向上的地震动均放大,场地反应谱低频部分受结构影响较大;在低于基准地震动作用下场地出现裂缝,在设计基准地震动作用下结构与土体分离。试验结束后,场地表面裂缝连通,结构无裂缝,地基失稳破坏。核电厂结构地震响应受场地条件的影响明显,在进行核电厂结构地震响应分析时应考虑场地条件和进行土-结构相互作用(SSI)分析。

In order to study the suitability and seismic response characteristics of the nuclear power plants on non-rock site, taking CAP1400 nuclear power plant （NPP） structure as an example, the shaking table test considering soil-structure interaction （SSI） was completed. The test study indicates that the site can amplify the peak acceleration which presents in all different directions, and the structure can influence the site response spectra in low frequency. Cracks appear on the model site when inputting less than safe shut-down earthquake （SSE）, and the contact surface between the structure and the soil separates when inputting safe shut-down earthquake （SSE）. At the end of the test, the surface cracks on the model site were connected. The model structure had no crack. The damage of the model system was due to the instability of the foundation. It was obvious that the seismic response of the NPP was affected by site conditions, thus the site conditions and the SSI analysis should be taken into account in the seismic response analysis of the NPP.