【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。采用弹塑性时程分析与风险矩阵相结合的方法对地下结构地震风险进行评估,以1995年阪神地震中遭受严重破坏的大开地铁车站为例阐明该方法的具体步骤。弹塑性时程分析能够考虑地下结构的各种复杂情况,直观地得到地下结构的损伤破坏情况,根据破坏情况建立风险矩阵对结构进行系统的风险管理。结果表明,弹塑性时程分析结合风险矩阵的风险评估方法具有较好的精确性和可靠性,适用于重要大型地下空间结构的地震风险评估。更多还原

【Abstract】 When strong shock happens,the foundation soil may undergo large deformation and be followed by the failure of weak parts of the structure.To evaluate the seismic risk of underground structure,a risk assessment method was proposed combining elasto-plastic time history analysis with risk matrix.The implementation procedure,the basic functions and the special features of the method were introduced in detail.The elasto-plastic time history analysis could describe the failure modes of the underground structures by considering different complex conditions.According to the damage of the structure,the seismic risk matrix was established and the seriousness of seismic risk was obtained.Taking Dakai subway station as an example,the dynamic responses under three earthquakes of different grades were simulated by elasto-plastic time history analysis,and the risk assessment of the structure was analyzed by the risk matrix method.The result shows that the method combining elasto-plastic time history analysis with risk matrix is useful and suitable for seismic risk assessment of large underground structures.更多还原