【摘要】 地下结构的薄弱环节在地震作用下可能发生破坏,进而影响整个结构体系的整体稳定性,地下结构的抗震能力成为结构工程领域研究的热点问题之一。在借鉴已有地下结构pushover分析方法的基础上,本文提出了一种考虑时空耦合的等效惯性加速度分布模式,详细介绍了该分布模式的求解步骤与基本特点,采用该方法对日本神户大开地铁车站进行了pushover分析,得到了地铁车站结构的能力曲线与变形情况,并与弹塑性动力时程分析结果进行对比。结果表明:本文提出的等效惯性加速度分布模式物理意义明确,概念清晰,可以从时间和空间两个层次上考虑,其最终的分布模式与地震波的选取关系不大,应用该分布模式进行地下结构pushover分析具有较好的可靠性和模拟精度,可以用于地铁车站等地下结构的抗震分析。更多还原

【Abstract】 Under the action of earthquakes,the weak spots of underground structure may fail,and then the stability of the whole structure is degraded.The study on the ability of underground structure becomes one hotspot in the field of engineering design.Based on the traditional pushover method in underground structure analysis,a distribution mode of equivalent acceleration is proposed,which takes the coupling of time and space into consideration.The characteristics and solution procedure of the distribution mode are detailedly introduced.In the pushover analysis of Daikai subway station,the proposed distribution mode is applied.The structure ability curves and deformation distribution are presented and compared with the results of elasto-plastic time-history analysis.The proposed distribution mode has a straightforward physical meaning,takes the influence of time and space into consideration,and has little relationship with the selection of input earthquake ground motions.The pushover analysis with the proposed mode is reliable,has high simulation precision,and thus can be applied to the analysis and design of earthquake-resistant structure.更多还原