Assessing the Blockage Risk of Disaster-Relief Road for a Large-Scale Earthquake
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pISSN 1226-7988, eISSN 1976-3808 www.springer.com/12205
DOI 10.1007/s12205-020-0340-7
Structural Engineering
Assessing the Blockage Risk of Disaster-Relief Road for a Large-Scale Earthquake I-Tien Loa,b, Ching-Yuan Lina, Cheng-Tao Yangc, Ying-Ji Chuanga, and Chi-Hao Linc a
Dept. of Architecture, National Taiwan University of Science and Technology, Taipei 10607, Taiwan Fire Department, New Taipei City Government, New Taipei City 22060, Taiwan c Earthquake Disaster Simulation Division, National Center for Research on Earthquake Engineering, Taipei 10668, Taiwan b
ARTICLE HISTORY
ABSTRACT
Received 26 February 2020 Accepted 13 July 2020 Published Online 24 September 2020
After a large-scale earthquake, the road is susceptible to get blocked by liquefaction or building collapse, and that results in disaster-relief difficulty. This study adopted two earthquake loss estimation systems in Taiwan, and the risk of road blockage caused by liquefaction or building collapse was calculated separately. A new modeling was proposed, and the comparisons of the results of a single factor and that of the joint factors were made. Four scenarios of peak ground acceleration (PGA) = 250, 400, 550, 750 Gal were tested. The result shows that the probability of road blockage due to liquefaction almost reaches the maximum when PGA hits 400 Gal. On the other hand, the probability of road blockage due to building collapse increases if PGA increases. The joint probability of road blockage due to liquefaction and building collapse can improve the underestimation when using either one factor, and it can evaluate the risk more realistically. At present, there is no risk assessment modeling considering two important factors for disaster-relief road planning in Taiwan. This study provides a simple and comprehensive disaster-relief road risk assessment modeling to make better emergency rescue plans. In addition, it can provide the information for conducting seismic strengthening policy for both sides of the disaster-relief road that can reduce the risk of obstacles to disaster-relief roads.
KEYWORDS Disaster-relief Earthquake Risk Liquefaction Building collapse
1. Introduction In Taiwan, the great Chichi earthquake with a magnitude of 7.3 occurred on September 21, 1999, which resulted in 2,413 deaths and blocked 711 roads (Loh, 1999; Chen, 2003). On February 6, 2016, the great Meinung Earthquake with a magnitude of 6.6 occurred, which resulted in 117 deaths and the Tainan Weiguan Jinlong building collapsed on the road (Chang, 2017; Lee et al., 2017; Kuo et al., 2017). On May 12, 2008, the Wenchuan earthquake of Mw 7.9 hit China, which resulted in 69,222 deaths and damaged 34,125 kilometers of roads (Chen et al., 2011; Ou and Li, 2011). On January 17, 1995, the Great Hanshin earthquake with a magnitude of 7.3 hit Japan, which resulted in 6,434 deaths and blocked 7,245 roads (Fire and Disaster Management Agency, 2006). The Great East Japan earthquake of Mw 9.0 occurred on March 11, 2011, resulted in 19,630 deaths and blocked 4,198 roads (Fire
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