不同地基条件对泳池式反应堆结构地震响应的影响

Influence of different foundation conditions on the seismic response of swimming pool reactor structure

摘要:

泳池式反应堆(简称泳池堆)是环境友好型的新型供热源,不同地基条件下反应堆厂房结构的地震响应是进行抗震设计的关键技术参考。以某堆型泳池式反应堆厂房为研究对象,基于ANSYS软件及UPFs的二次开发特点,建立考虑液晃效应的泳池堆-地基三维动力相互作用模型,其中,通过创建黏弹性边界单元来考虑散射波的能量耗散,采用Housner等效力学模型模拟动液压效应,从而开展不同地基对泳池堆厂房结构地震响应的影响分析。分析结果表明:当地基土的坚硬度、刚度逐渐减小时,泳池堆的地震响应变化明显,特别是由岩性地基逐渐变为土质地基时,结构的主应力和层间位移角逐渐增大,而加速度反应谱则逐渐减小。研究成果可为不同型号泳池堆的抗震设计提供有益的参考。

Abstract:

The swimming pool reactor (SPR) is a new type of environment-friendly heating source. The seismic response of a reactor building under diverse foundation conditions is the crucial technical reference for its seismic design. A certain SPR building was considered as the research object, and the three-dimensional dynamic interaction model of SPR foundation considering the liquid sloshing effect was established based on ANSYS software and secondary development characteristics of UPFs. The energy dissipation of scattered waves was considered by creating viscoelastic boundary elements, and the dynamic hydraulic effect was simulated using the Housner equivalent mechanical model. Thus, an impact analysis of diverse foundations on the seismic response of the SPR building structure was carried out. The analysis results reveal that the seismic response of the SPR changes considerably when the hardness and stiffness of the foundation decrease gradually, particularly when the lithologic foundation progressively changes into the soil foundation, the principal stress and story drift ratio of the structure increase progressively, and the acceleration response spectrum gradually reduces. The research production can offer a beneficial reference for the seismic design of various SPRs.