Abstract
In December 2020, a strong earthquake occurred in Northwestern Croatia with a magnitude of ML = 6.3. The epicenter of this earthquake was located in the town of Petrinja, about 50 km from Zagreb, and caused severe structural damage throughout Sisak-Moslavina county. One of the biggest problems after this earthquake was the structural condition of the bridges, especially since most of them had to be used immediately for demolition, rescue, and the transport of mobile housing units in the affected areas. Teams of civil engineers were quickly formed to assess the damage and structural viability of these bridges and take necessary actions to make them operational again. This paper presents the results of the rapid post-earthquake assessment for a total of eight bridges, all located in or around the city of Glina. For the assessment, a visual inspection was performed according to a previously established methodology. Although most of the inspected bridges were found to be deteriorated due to old age and lack of maintenance, very few of them showed serious damage from the earthquake, with only one bridge requiring immediate strengthening measures and use restrictions. These measurements are also presented in this paper.
Highlights
Northwestern Croatia was shaken by two major earthquakes
New fault planes occurred along the NW–SE Dinaric strike, activating the 20 km long section of the Pokupsko fault [5,6]
This paper provides an overview of the post-earthquake assessment of bridges in the Glina region, which included eight overall bridges
Summary
Northwestern Croatia was shaken by two major earthquakes. The first occurred in March 2020, with an epicenter 10 km north of the capital Zagreb and a magnitude of ML = 5.5. Visual inspection is the imperative in any bridge assessment methodology, a detail account of bridge performance can only be obtained by collecting additional data of the bridge structure These data must include stiffness distribution parameters, material properties, real traffic loads, and modeling analysis [20,21]. The deterioration of non-structural elements was recorded for future reference and is presented Since this quick visual inspection immediately after the earthquake only served to answer the question of whether the bridge should continue to be used after the earthquake, no scoring system was used and the ratings were given as “continue to use”, “close the bridge”, or “issue use restrictions” (Figure 3)
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