具有中介状态的生命线网络系统抗震可靠性分析

The seismic reliability analysis of infrastructure network system with medium condition

现有的生命线抗震可靠性分析多采用两元易损性假设,即假设单元和系统的工作状态仅有"连通"与"断开"两种,并以连通可靠度近似代替系统抗震可靠性。事实上,系统或单元的工作状态从"连通"与"断开"是渐变的,或者说从连通到不连通之间具有中介状态,通过建立生命线工程的震后工作状态判别准则,定义了"连通-中介-断开"三维可靠性向量,并在传统"连通-断开"模式下的网络系统可靠性评估方法的基础上,提出具有中介状态的生命线网络工程系统抗震可靠性评估方法。

The existing theory of seismic reliability analysis of lifeline network is based on two-state supposition, which means there are only two working states being considered:connective and cut off,and connective reliability is taken as system seismic reliability.In fact,the process from connection to disconnection is changing gradually. i.e.there is a medium condition between these two conditions.Through building distinguish standard of post-earth- quake working condition for lifeline engineering,three-dimension reliability vectors are defined in the paper,i.e. connection-medium connection-disconnection.In the mean time,by converting'connection-medium connection-cut off'mode to'connection-not_connection(including medium and cut off states)' mode or not cut off(including medium and connection states)-cut off″ mode,and based on the traditional two-state network system reliability e- valuation algorithm,the evaluation model of the lifeline network seismic reliability with medium state is proposed in the paper.