engleski

Influence of pounding on seismic performance of existing buildings in the City of Zagreb, Croatia

Many buildings in Zagreb were built before the first seismic codes appeared in the region, thus, the separation gaps between buildings were not constructed in accordance with modern seismic rules and regulations. Therefore, the aim of this study was to investigate potentially detrimental effect of pounding on the existing structures and consequently, improve current building seismic vulnerability database of the city, located in seismically active zone. Several adjacent buildings were investigated, representing three categories: eccentrically located adjacent buildings, buildings in rows and buildings with different heights. Three-dimensional numerical models of buildings were constructed on the basis of “as built” structures, calibrated with the results of ambient vibration testing. In everyday practice, adjacent buildings are often analysed as detached units. Therefore, results obtained by time-history analysis of numerical models with separation gaps defined as nonlinear link elements, were compared to the results of analyses performed using traditional methods (response spectrum and equivalent static forces) on adjoining buildings modelled as standalone structures and rigidly connected adjacent structures. Analyses results show that pounding has different influence on analysed buildings from the three categories: eccentrically located adjacent buildings are the most threatened, followed by buildings with different heights, while buildings in rows are the least vulnerable.

seismic performance ; existing buildings ; separation gaps ; structural pounding ; numerical models

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