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Vulnérabilité Sismique de l'échelle du bâtiment à celle de la ville - Apport des techniques expérimentales in situ - Application à Grenoble

Abstract : Seismic vulnerability analysis of existing buildings requires basic information on their structural behaviour. In the current methods such as HAZUS or Risk-UE, these parameters are collected by visual screening or estimated among generic values of physical parameters. Even for more complete diagnosis, the experts have to deal with the lack of structural plans, the unknown quality of material, ageing and damaging of the structure. The ambient vibrations of buildings and the modal parameters (frequencies, damping ration and modal shapes) that can be extracted from them naturally include all these parameters in the linear elastic part of their behaviour. The aim of this work is to use this modal information to help the vulnerability assessment.

A linear dynamic modal model based on experimental modal parameters is proposed. A damage threshold for the damage state “Slight” is chosen for each class of building. This model is validated using recordings of earthquakes in a structure with permanent monitoring installed by the French Accelerometric Network. Moreover, the fragility curve corresponding to the damage state “Slight” is build using numerous ground motions.

This methodology is applied to the Grenoble City where ambient vibrations have been recorded in 61 buildings of various types at one point per floor at least. The modal analysis has been performed using the Frequency Domain Decomposition technique that allows to separate close modes. A structural study of each class of building regarding their modal properties is performed and the fragility curves developed using the aforementioned methodology. The seismic risk of the city is finally discussed by performing seismic scenarios.
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https://tel.archives-ouvertes.fr/tel-00191024
Contributor : Clotaire Michel <>
Submitted on : Friday, November 23, 2007 - 3:00:36 PM
Last modification on : Thursday, November 19, 2020 - 3:54:28 PM
Long-term archiving on: : Thursday, September 27, 2012 - 10:15:19 AM

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  • HAL Id : tel-00191024, version 1

Citation

Clotaire Michel. Vulnérabilité Sismique de l'échelle du bâtiment à celle de la ville - Apport des techniques expérimentales in situ - Application à Grenoble. Géophysique [physics.geo-ph]. Université Joseph-Fourier - Grenoble I, 2007. Français. ⟨tel-00191024⟩

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