【摘要】 在日本阪神大地震中,地下结构遭到了严重破坏,因此地下结构的地震反应及抗震设计和安全性评价越来越被重视。首先采用矩形地下结构的两种抗震设计方法——拟静力法和反应位移法对北京地铁北宫门车站进行了抗震计算,并使用计算软件FLAC4.0对北宫门车站进行了时程分析,发现拟静力法对地震荷载过于简化,致使其过低估计了地震对地下结构的影响;而反应位移法较合理地反应了地震荷载对地下结构的影响;地震中的惯性力对地下结构的内力影响不大,地震剪应力对结构的内力影响最大;并且,通过软件FLAC时程分析,得到的位移等反应规律与反应位移法的假设相同,计算得到的弯矩值与采用反应位移法计算得到的弯矩值相近。因此,推荐首先采用反应位移法进行地下结构的抗震设计。更多还原

【Abstract】 The Great Hanshin earthquake in Japan brought about serious damages to some underground reinforced concrete structures,thereupon the research on the aseismic design and the safety estimation of underground structures has attracted special attention.By means of quasi-static and displacement response methods respectively,the aseismic analyses of Beigongmen station of Beijing subway were performed and by adopting software FLAC4.0 the dynamic numerical analysis was also carried out.It was found that the earthquake loads were excessively simplified in the quasi-static method and the earthquake influence on the underground structure was underestimated while in the displacement response method the earthquake responses were basically reasonably addressed.Besides,inertial force in the earthquake exerted a small influence on the underground structures while shearing force affected the underground structures to a large extent.Moreover,the response regulations of the relative displacements and so on in FLAC method agreed with the assumptions of the displacement response method,and the calculated moment values by FLAC were approximate with those obtained by the displacement response method.Therefore,the displacement response method is recommended for the aseismic design of underground structures.更多还原