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Communication Dans Un Congrès Année : 2009

Vulnerability assessment of existing masonry buildings in moderate seismicity areas using experimental techniques

Résumé

Vulnerability assessment in moderate seismicity areas needs particularly accurate estimations of low damage grades, since they cause a great part of economic losses. For moderate level of shaking, the most important parameter is the fundamental resonance frequency as it varies with amplitude with consequences on seismic demand. In order to accurately but simply model the response of existing buildings to moderate earthquakes, in situ and laboratory tests together with a frequency drop approach were used. The dynamic behaviour of existing buildings, for which it is difficult to obtain plans and material physical properties, is first assessed by recording ambient vibrations simultaneously at several points. Resonance frequencies, damping ratios and modal shapes are derived using the Frequency Domain Decomposition method, a simple but efficient modal analysis method that allows decomposing modes, even close. These modal parameters, used in a linear multiple degree-of-freedom model, give the building response to weak ground motions. Additionally, an amplitude-frequency relationship has been derived from pseudo- dynamic tests of full-scale unreinforced masonry (URM) structures with reinforced concrete (RC) slabs made by ELSA laboratory in Ispra (Italy). This relationship is used in the MDOF model that can then be turned into a non-linear elastic model that should be able to well represent maximal response until moderate damage. Then, a 164 ground motions database selected in the European database is used to compute fragility curves, assuming inter-story (I-S) drift limits extracted from the literature and laboratory tests. In this study, two URM buildings with RC slabs, typical of Swiss construction between 1940 and 1960 located in Visp (Valais) have been tested using full-scale ambient vibrations. A simple non-linear elastic model based on these tests and on laboratory pseudo-dynamic tests is built and used to compute fragility curves from slight to severe damage. The results are compared with displacement-based computations and numerical models.
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Dates et versions

hal-00532590 , version 1 (04-11-2010)

Identifiants

  • HAL Id : hal-00532590 , version 1

Citer

Clotaire Michel, Eric Lattion, Marcelo Oropeza, Pierino Lestuzzi. Vulnerability assessment of existing masonry buildings in moderate seismicity areas using experimental techniques. 2009 Asian-Pacific Network of Centers for Earthquake Engineering Research (ANCER) Workshop, Aug 2009, Urbana (IL), United States. paper 142. ⟨hal-00532590⟩
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