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Seismic Assessment of Obod Bridge in Croatia

The Obod Bridge, a reinforced concrete bridge constructed on scaffolding about fifty years ago, is located on state road between Dubrovnik and its airport in a highly seismic active area. The bridge deck is a reinforced concrete voided slab with the longest span of 27 m. It is supported by V-shaped pier bents and concrete hinge bearings at abutments. The bridge was designed and constructed according to 1960’s design codes with no seismic actions taken into the account. According to the current Croatian seismological chart, the peak ground acceleration at the bridge location is 0.3g. For this reason the bridge was assessed for seismic actions utilizing both the linear response spectrum analysis and the nonlinear static pushover method and results were evaluated following the demands defined by current European seismic design codes.

Seismic assessment; reinforced concrete beam bridge; nonlinear static pushover analysis

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