城市大型地下空间结构地震风险评估体系研究

Research on seismic risk assessment system of urban large and complex underground structures

城市大型地下空间结构引领着未来地下工程开发的新趋势,其抗震性能已成为工程及学术领域研究的热点问题。基于数值仿真分析的计算结果,提出了适合大型地下空间结构的地震风险评估体系,首次构建了评估指标,利用权重系数法确定了各评价指标的权重,结合评估项目实践,采用模糊语言描述进行了风险等级的划分,进而建立了适合地下结构地震风险评估的控制流程并进行了实例验证。研究结果表明:基于数值仿真分析的地震风险评估体系能够直观地呈现结构地震破坏机制,有效地进行风险溯源,从而给出合理的风险等级和针对性的控制措施,获得满意的风险评估结果。地震风险评估体系的建立为城市大型复杂地下结构的地震风险预测相关指南规范的研究提供了参考数据。

The large urban underground spatial structures lead a new trend of underground engineering development in the future,whose seismic performance has been becoming a hot issue in research of engineering and academic field.Based on the calculation results of numerical simulation analysis,a seismic risk assessment system was proposed which is suitable for large underground spatial structures. The evaluation indexes were built for the first time and the weight coefficient method was used to determine the weight of each evaluation index. According to actual application of evaluation project,the risk level was described by Fuzzy language,then the seismic risk assessment control process for underground structure was established,which is verified by a project example. The research result shows that: the structure earthquake damage mechanism can be directly present by the seismic risk assessment system which was based on numerical simulation analysis,so the risk source can be effectively traced. Afterwards,a reasonable level of risk and corresponding risk control measures can be gotten,then the satisfactory risk assessment result was obtained at last. The establishment of earthquake risk assessment system provides some reference data for the code of urban underground structures.