Vulnerability index and capacity spectrum based methods for urban seismic risk evaluation. A comparison |
| |
Authors: | Nieves Lantada Luis G Pujades and Alex H Barbat |
| |
Institution: | (1) Department of Geotechnical Engineering and Geosciences, Technical University of Catalonia, Jordi Girona 1–3, Building D2, Campus Norte UPC, 08034 Barcelona, Spain;(2) Department of Structural Mechanics, Technical University of Catalonia, Jordi Girona 1–3, Building C1, Campus Norte UPC, 08034 Barcelona, Spain |
| |
Abstract: | This article contributes to the development and application of two latest-generation methods of seismic risk analysis in urban
areas. The first method, namely vulnerability index method (VIM), considers five non-null damage states, defines the action
in terms of macroseismic intensity and the seismic quality of the building by means of a vulnerability index. The estimated
damage degree is measured by semi-empirical functions. The second method, namely capacity spectrum based method (CSBM), considers
four no damage states, defines the seismic action in terms of response spectra and the building vulnerability by means of
its capacity spectrum. In order to apply both methods to Barcelona (Spain) and compare the results, a deterministic and a
probabilistic hazard scenario with soil effects are used. The deterministic one corresponds to a historic earthquake, while
the probabilistic seismic ground motion has a probability of exceedence of 10% in 50 years. Detailed information on the building
design has been obtained along years by collecting, arranging, improving, and completing the database of the dwellings of
the city. A Geographic Information System (GIS) has been customized allowing storing, analysing, and displaying this large
amount of spatial and tabular data of dwellings. The obtained results are highly consistent with the historical and modern
evolution of the populated area and show the validity and strength of both methods. Although Barcelona has a low to moderate
seismic hazard, its expected seismic risk is significant because of the high vulnerability of its buildings. Cities such as
Barcelona, located in a low to moderate seismic hazard region, are usually not aware of the seismic risk. The detailed risk
maps obtained offer a great opportunity to guide the decision making in the field of seismic risk prevention and mitigation
in Barcelona, and for emergency planning in the city. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|