Assessment of Building Physical Vulnerability in Earthquake‑Debris Flow Disaster Chain  

作　　者：Hao Zheng Zhifei Deng Lanlan Guo Jifu Liu Lianyou Liu Tiewei Li Huan Zheng Tao Zheng 

机构地区：[1]Key Laboratory of Environmental Change and Natural Disaster of Ministry of Education,Faculty of Geographical Science,Beijing Normal University,Beijing 100875,China [2]Academy of Disaster Reduction and Emergency Management,Faculty of Geographical Science,Beijing Normal University,Beijing 100875,China [3]Department of Fire Commanding,China Fire and Rescue Institute,Beijing 102202,China [4]China Railway First Group Construction and Installation Engineering Co.,Ltd.,Xi’an 710054,China

出　　处：《International Journal of Disaster Risk Science》2023年第4期666-679,共14页国际灾害风险科学学报（英文版）

基　　金：The Second Tibetan Plateau Scientifc Expedition and Research Program(STEP,Grant No.2019QZKK0906);the National Key Research and Development Project(Research and demonstration of key technologies for comprehensive prevention of multiple major natural disasters in metropolitan areas,Grant No.2017YFC1503000)jointly supported this work.We thank the Beichuan National Earthquake Ruins Museum for their support。

摘　　要：Large earthquakes not only directly damage buildings but also trigger debris fows,which cause secondary damage to buildings,forming a more destructive earthquake-debris fow disaster chain.A quantitative assessment of building vulnerability is essential for damage assessment after a disaster and for pre-disaster prevention.Using mechanical analysis based on pushover,a physical vulnerability assessment model of buildings in the earthquake-debris fow disaster chain is proposed to assess the vulnerability of buildings in Beichuan County,China.Based on the specifc sequence of events in the earthquake-debris fow disaster chain,the seismic vulnerability of buildings is 79%,the fow impact and burial vulnerabilities of damaged buildings to debris fow are 92%and 28%respectively,and the holistic vulnerability of buildings under the disaster chain is 57%.By comparing diferent vulnerability assessment methods,we observed that the physical vulnerability of buildings under the disaster chain process is not equal to the statistical summation of the vulnerabilities to independent hazards,which implies that the structural properties and vulnerability of buildings have changed during the disaster chain process.Our results provide an integrated explanation of building vulnerability,which is essential for understanding building vulnerability in earthquake-debris fow disaster chain and building vulnerability under other disaster chains.

关 键 词：Building physical vulnerability Debris fow Disaster chain EARTHQUAKE 

分 类 号：P31[天文地球—固体地球物理学]