CAJ | 학술논문

基于结构动力学理论推导两种考虑近场地震竖向效应的改进 Pushover 分析方法。按合理方式在结构的每个集中质量处施加竖向地震力，并据结构屈服后动力特性对其水平加载模式及形状向量进行修正。采用两种改进Pushover 分析方法及两种传统 Pushover 分析方法，估计近场条件下两个框架结构顶点位移、楼层位移及层间位移。以算例结构在30组近场地震记录作用下的时程分析统计结果为基准，评估4种 Pushover 分析方法估计精度。结果表明，改进方法Ⅱ的精度最高，对算例框架最大顶点位移、最大楼层位移及最大层间位移估计结果均较准确，可用于近场条件下规则结构的地震反应分析及地震损伤评估。
기우결구동역학이론추도량충고필근장지진수향효응적개진 Pushover 분석방법。안합리방식재결구적매개집중질량처시가수향지진력，병거결구굴복후동력특성대기수평가재모식급형상향량진행수정。채용량충개진Pushover 분석방법급량충전통 Pushover 분석방법，고계근장조건하량개광가결구정점위이、루층위이급층간위이。이산례결구재30조근장지진기록작용하적시정분석통계결과위기준，평고4충 Pushover 분석방법고계정도。결과표명，개진방법Ⅱ적정도최고，대산례광가최대정점위이、최대루층위이급최대층간위이고계결과균교준학，가용우근장조건하규칙결구적지진반응분석급지진손상평고。
Based on the theory of structural dynamics,two kinds of improved push over analysis (POA)procedures were deduced to consider the vertical effect of near-fault earthquake.In the improved methods,the vertical seismic force was supposed to be loaded on each lumped mass before the structural POA,and the lateral load distribution as well as the shape vector were modified according to the dynamical features of the structure after yielding.Applying two improved and two traditional POA procedures respectively,two frame structures in near-fault site,as numerical examples,were investigated for their important seismic responses,such as the roof displacement,floor displacement and inter-story drift. According to the statistical results of structural dynamic time-history analysis based on 30 sets of near-fault ground motion records,the accuracy of seismic response parameters estimated by different POA methods was testified.The results show that the modified method Ⅱ possesses much higher precision compared with other methods and this method can simultaneously estimate the maximum roof-displacement,maximum floor-displacement and maximum inter-story drift of frame with high accuracy,hence can be applied to the seismic response analysis and seismic damage assessment of regular structures in the near-fault site.