Open AccessMulti‐hazard fragility analysis of RC bridges for high seismicity and high scouring scenarios
Author(s) -
Ghimire Roshan,
Pradhan Piyush,
Gautam Dipendra
Publication year - 2022
Publication title -
the journal of engineering
Language(s) - English
Resource type - Journals
ISSN - 2051-3305
DOI - 10.1049/tje2.12145
Subject(s) - fragility , induced seismicity , seismic hazard , natural hazard , hazard , geology , seismic risk , earthquake scenario , vulnerability (computing) , seismology , computer science , chemistry , oceanography , computer security , organic chemistry
Both earthquakes and floods occur frequently in the Himalayas. Since bridge structures are designed considering earthquake forces alone, floods are causing significant damage to bridges almost every year. Thus, it is obvious that floods and earthquakes are the two most important natural hazards that could alter the performance of bridges in the Himalayas. Furthermore, settlement and scouring are commonly observed in many bridges in Nepal and neighbouring regions. To this end, the conventional earthquake force‐based analysis approaches become conservative as the conventional approaches do not account for multi‐hazard impacts and design considerations. To fulfil the gap regarding multi‐hazard vulnerability characterization, this study presents a comparative assessment of single and multiple natural hazards that are likely to impact Nepali highway bridges. Seismic fragility functions for representative reinforced concrete (RC) bridges are developed for earthquake only and earthquake and scouring scenarios. Parametric variation of likely scouring depth obtained from the hydrological analysis is used to depict the probabilistic scenario to obtain fragility functions for various scour levels. The sum of the findings outlines that the seismic vulnerability of RC bridges increases significantly when scouring precedes seismic excitation.