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Experiences on strengthening of masonry buildings in Italy
No full text. In the paper, the main experiences on the strengthening of historic masonry buildings are shortly described. Repair and strengthening techniques currently applied in Italy, and largely diffused in several seismic areas are discussed in terms of their design, feasibility and execution aspects. Moreover, structural efficiency evaluations are performed on the basis of recent experimental studies, carried out both on laboratory and in situ, and of modelling analyses, based on dynamic identification procedures. In particular, in order to identify the mechanical behaviour of the structures, non destructive dynamic tests supported by numerical modelling are conducted
A methodological approach to bridge maintenance and criteria for seismic risk evaluation
No full textLa manutenzione programmata di ponti e viadotti: criteri per la valutazione dell'efficienza in servizio
No full text
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Nonlinear Damping Identification in Precast Prestressed Reinforced Concrete Beams
Full text linkThis article presents a damage detection method for prestressed reinforced concrete (PRC) ele- ments based on free vibration tests and nonlinear damp- ing identification. Integrated static and dynamic exper- iments were carried out on three precast PRC beam specimens. The static loading induced different levels of damage to the beams. At each damage level, impul- sive loading was applied to the beams and the free vi- bration response was measured. The dynamic response data were processed using different methods including the multi-input multi-output (MIMO) curve fitting and the Hilbert transform techniques. A strong correlation is observed between the level of concrete damage (cracks) and the amount of nonlinear energy dissipation that can be modeled by means of quadratic damping. The non- linear damping can be extracted from the free vibration response for each vibration mode. The proposed method is suited for quality control when manufacturing precast PRC members, and can be further extended for in situ detection of damage in concrete structures under ambi- ent vibration
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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