泸定6.8级地震磨西镇建筑坠落物模拟及其对道路通行的影响OA

Falling debris from buildings along streets during strong earthquakes often affects the capaci-ty of urban roads in disaster-affected areas to varying degrees.Taking Moxi Town in the mountainous area of western Sichuan Province as the study area,this study investigated the degradation of road ca-pacity caused by the 2022 Luding Ms 6.8 earthquake and analyzed the influence mechanisms of falling debris on the post-earthquake transportation system.Based on seismic damage surveys and remote sensing imagery data,an elastoplastic time-history analysis model for building clusters and a multi-body dynamics collapse model were established to simulate the seismic damage of building clusters in Moxi Town during the Luding earthquake and to assess the spatial distribution of falling debris.On this basis,the effects of seismic intensity,building structural types,and other factors on the distribu-tion of falling debris and road capacity in mountainous towns were analyzed.The results showed that the distribution range and morphology of falling debris obtained by the simulation method in this study were basically consistent with the results of actual seismic damage surveys.The spatial distribution of building falling debris was significantly affected by earthquake intensity,structure type,and topo-graphic location.As earthquake intensity increased,the coverage of falling debris expanded,with a significant increase observed for brick masonry structures and structures without seismic fortification.The unique topographic characteristics of the Moxi terrace resulted in a larger distribution range of fall-ing debris from buildings at the terrace edge than those in the central area of the terrace.Under the 9-degree fortification ground motion,the capacity of some road sections decreased by more than 50%.When the seismic action reached the 9-degree extremely rare earthquake level,the proportion of blocked road sections exceeded 70%,and the transportation system was close to paralysis.This study provides a reference for planning earthquake emergency rescue routes and post-earthquake traffic resto-ration in mountainous towns of southwestern China.