Abstract
Background:Recent major earthquakes in the centre of the Italy, between August and October 2016, have reaffirmed the seismic vulnerability of precast industrial buildings with a lot of collapse recorded. This is typical due to the past Italian building practices, where structural deficiencies are mainly related to the capacity to transfer horizontal forces between primary structural elements.Objectives and Methods:In these types of structures, a key role is played by the dowel pin connections which allow to transfer lateral horizontal forces from the beam to the column, without losing load carrying capacity. For this reason, in this work, the assessment of the seismic fragility of single-story reinforced concrete precast building located not far from the epicentres of the two aforementioned earthquakes was done.Results and Conclusion:The seismic risk was evaluated in terms of annual frequency of exceedance for three performance levels provided by the European and Italian seismic codes, considering the mean hazard curves for the site. The comparison between the fragility of different structural models shows the importance in the choice of the column-beam connection modelling to obtain reliable results on the structural safety assessment.
Highlights
During the last earthquakes in Italy, i.e. Emilia Romagna 2012 and Marche-Umbria-Lazio-Abruzzo 2016, many Reinforced Concrete (RC) Industrial Precast Buildings (IPBs) collapsed or suffered heavy structural damage [1 - 3]
Further results are reported in a study [17], where Incremental Nonlinear Dynamic Analyses (IDAs) curves were plotted in terms of maximum displacements vs the corresponding base shear and were compared with the relative pushover curves which were observed to be same
The number of IDA curves crossing the vertical lines representative of the three damage states has been computed for Peak Ground Acceleration (PGA) values ranging from 0.05g to 1g, with an increasing step of 0.05g [52]
Summary
During the last earthquakes in Italy, i.e. Emilia Romagna 2012 and Marche-Umbria-Lazio-Abruzzo 2016, many Reinforced Concrete (RC) Industrial Precast Buildings (IPBs) collapsed or suffered heavy structural damage [1 - 3]. In the last years, many studies were performed [4 - 6] in order to better understand the seismic behavior of this type of structures and to evaluate their seismic risk in order to establish direct losses, such as human casualties and structural and non-structural failures, and indirect economic losses as a consequence of the business interruption This purpose, fragility curves, representing the conditional probability of reaching or exceeding a certain performance level (or damage state) given a specific level of the intensity hazard, have been developed by several authors [7] for PIBs. The curves are mainly based on analytical methods, while empirical studies are conditioned to the. Recent major earthquakes in the centre of the Italy, between August and October 2016, have reaffirmed the seismic vulnerability of precast industrial buildings with a lot of collapse recorded This is typical due to the past Italian building practices, where structural deficiencies are mainly related to the capacity to transfer horizontal forces between primary structural elements
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