沉陷区地下桩基的抗震性能分析与研究

Analysis and Research on Seismic Performance of Underground Pile Foundation in Subsidence Area

从历次地震对地下建筑物造成的破坏来看,地下工程的震害特征分析研究以及地震可靠性分析对于桩基的抗震设计,防震减灾等工作具有重要的研究价值.地下桩基在地震时的破坏机理比地上结构要复杂,影响因素很多.早期的桩基地震可靠性分析主要是基于经验方法,借用震害对桩基的破坏率来进行分析设计的,现在采用有限元概率模型对桩基震害进行分析,这种基于理论计算的方法能够考虑多种随机因素的影响.通过Ansys有限元模型计算分析出管道的破坏状态,为地下桩基设计提供帮助.

In view of the damage of underground buildings caused by previous large earthquakes,the seismic damage characteristics analysis and seismic reliability analysis of underground engineering have important research value for the seismic design of pile foundation,earthquake prevention and disaster reduction.The failure mechanism of underground pile foundation in earthquake is more complex than that of overground structure,and there are many influencing factors.Earlier seismic reliability analysis of pile foundation is mainly based on empirical method,which uses the failure rate of earthquake damage to pile foundation for analysis and design.Now the finite element probability model is used to analyze the seismic damage of pile foundation.This method based on theoretical calculation can take into account the influence of many random factors.The failure state of pipeline is calculated and analyzed by Ansys finite element model,which provides help for the design of underground pile foundation.