基于拓扑的多龄期埋地腐蚀供水管网抗震韧性评估OA

To consider the influence of soil corrosion environments and pipeline service ages on the seismic resilience of water supply networks(WSNs),a topology-based seismic resilience assessment method for multi-age corroded buried WSNs was proposed.Firstly,a time-varying constitutive model of buried steel pipes in acidic,alkaline,and near-neutral soil environments was established based on a homogeneous Markov process.Then,analytical seismic vulnerability models of buried pipelines with different diameters under different soil corrosion environments and service ages were established based on incremental dynamic analysis.Finally,connection density was used to characterize the seismic per-formance indicator of the WSNs,and the performance response function(PRF)method was used to quantify the seismic resilience of the WSNs.Based on stochastic simulation,the system′s seismic resil-ience was represented by the average seismic resilience under two scenarios:sequential repair by a sin-gle repair crew and simultaneous repair of all damaged pipelines.The analysis results showed that un-der rare earthquakes,the average seismic performance of the WSNs decreased by 31.85%compared with that under fortification earthquakes,but the overall seismic resilience remained at a high level,with values of 0.942 2 and 0.999 5,respectively.The seismic performance and seismic resilience of WSNs calculated by traditional assessment methods that did not consider corrosion environments and service ages were overly optimistic.The findings provide a theoretical reference for accurately improv-ing the seismic resilience of urban WSNs.