CAJ | 학술논문

当地震足够大时结构基础将会与下卧地基土发生分离，即所谓的基础提离现象。但该现象在常规的土－结构相互用（SSI）的地震响应分析中常常被忽视。核电站结构（NPP）由于特殊性，其设计地震强度一般较大，因而有可能发生基础提离现象。基于某简化核电站结构，利用大型通用软件ANSYS的接触面功能和弹簧单元，分别进行了四种工况的计算：①基础固定；②考虑基础提离，不考虑土－结构动力相互作用效应；③不考虑基础提离，但考虑土－结构动力相互作用效应；④同时考虑基础分离和土－结构动力相互作用效应。通过对比分析，确定合适的土－结构动力相互作用计算方法以及基础提离对核电站结构地震响应的影响。计算分析表明：①土－结构相互作用对核电站结构地震响应的影响不容忽视；②基础提离主要影响核电站结构竖向地震响应，而对结构水平向地震响应的影响较小。本文研究成果可为核电站结构的抗震分析提供参考。
당지진족구대시결구기출장회여하와지기토발생분리，즉소위적기출제리현상。단해현상재상규적토－결구상호용（SSI）적지진향응분석중상상피홀시。핵전참결구（NPP）유우특수성，기설계지진강도일반교대，인이유가능발생기출제리현상。기우모간화핵전참결구，이용대형통용연건ANSYS적접촉면공능화탄황단원，분별진행료사충공황적계산：①기출고정；②고필기출제리，불고필토－결구동력상호작용효응；③불고필기출제리，단고필토－결구동력상호작용효응；④동시고필기출분리화토－결구동력상호작용효응。통과대비분석，학정합괄적토－결구동력상호작용계산방법이급기출제리대핵전참결구지진향응적영향。계산분석표명：①토－결구상호작용대핵전참결구지진향응적영향불용홀시；②기출제리주요영향핵전참결구수향지진향응，이대결구수평향지진향응적영향교소。본문연구성과가위핵전참결구적항진분석제공삼고。
The structure foundation may be separated from the supporting soil if the earthquake is strong enough, which is the so called phenomenon of foundation uplift.This phenomenon,unfortunately,is always neglected in seismic response analysis of soil-structure interaction (SSI)system.The designed seismic level for nuclear power plant (NPP)is usually very high because of its specificity,therefore,the foundation of nuclear power plant will probably be separated from the supporting soil.Based on a simplified NPP calculation model and by employing the contact function and spring element in the software ANSYS,four cases were considered:①foundation is fixed;②foundation uplift is considered and SSI effect is not considered;③SSI effect is considered and foundation uplift is not considered;④both foundation uplift and SSI effect are considered.The influences of SSI and foundation uplift on structural seismic response were analyzed by comparing the computation results.It is shown from the computation results that the influence of SSI on structural seismic response can not be neglected;foundation uplift influences structural vertical response mainly,and has a very little influence on structural horizontal response.The results provide some references to seismic design of NPP.