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Abstract
The recent earthquakes in Algeria have caused significant human and economic losses. The frequent occurrence of damaging earthquakes clearly demonstrates the urgent need of study on seismic risk assessment methods of buildings to effectively reduce the impact of earthquake in Algerian cities. This article contributes to the development and the application of a seismic risk method, appropriate to Algerian building specificities. This method considers five damage levels, defined accordingly to macroseismic intensity and the seismic quality of the building by means of a vulnerability index. The present paper summarises the development of a tool to integrate seismic hazard and structural information and support the decision making process in identification of seismic risk. This tool could be used in the inspection of buildings and the optimal prioritisation of strengthening and preventives remedial actions that are necessary prior to a major earthquake event.
Highlights
Most of the losses from earthquakes are caused by the high vulnerability of the housing stock
The purpose of this paper is to develop a simple model to evaluate the seismic risk of existing buildings at the regional level
For reinforced concrete (RC) buildings: (1) The organization of the resistance in the case of RC buildings located in Algeria is not of great variability, we propose to pass for this parameter from 4 to 2; (2) The conventional resistance is twice hit by a very low resistance of the concrete structure (14Á17) MPa observed in the samples and the lack of seismic conception, we propose to increase for this parameter from 1 to 3; (3) The existence of flexible floor: a flexible floor in a building usually presenting a defect at the ground floor which is generally used as a commercial space
Summary
Most of the losses from earthquakes are caused by the high vulnerability of the housing stock. In urban areas, this vulnerability, combined with a high concentration of buildings, can lead to a high seismic risk. The seismic risk assessment requires first the evaluation of seismic vulnerability. Seismic risk loss could be estimated as follows (Coburn, Spence 2002): Risk 1⁄4 hazard  vulnerability; (1). Where the hazard is the probability of a seismic intensity for a specified period of time. There are two general approaches for determining ground motion, deterministic models and probabilistic models (Giovinazzi 2005). One or other of these approaches can be used for a given site
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