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【正文】 e, as it depends on building and soil type. For example, in case of reinforced concrete buildings with masonry infill, a very large increase of the building period can be expected with the level of shaking due to cracking of structural members and, particularly, of brittle masonry infill, see . Mucciarelli et al. (2004), Calvi et al. (2006).Finally, estimating the variation of the dynamic characteristics after retrofitting or strengthening interventions, by puting the modified values of fundamental periods, damping factors and mode shapes, can be a practical tool to evaluate the effectiveness of the intervention (Farsi et al., 2008). To this purpose and also as a diagnosis tool, ambient vibration measurements can be very helpful (Boutin and Hans, 2008).All the above questions strongly require that further studies as well wide insitu and laboratory experimental campaigns are carried out to set up procedures able to evaluate, in a reliable as well not expensive way, building dynamic properties.
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