Damage on Concrete Bridges Due to Projectile Impact and Blast Loading

U okviru završnog rada provedena je analiza srušenih i oštećenih betonskih mostova za vrijeme Domovinskog rata. Analizirano je 70 betonskih mostova prema karakteristikama konstrukcije: nosivi sustav i vrsta nosivog sustava, godina starosti, rasponska konstrukcija i površina, ali i prema realizaciji hazarda: postavljeni eksploziv, udar projektila ili kombinacijom eksploziva i udara projektila. Mostovi su kategorizirani tako da se što bolje utvrdi koji faktori najviše utječu na postotak srušenosti mosta. Nakon provedene analize srušenih i oštećenih mostova provedeno je rušenje dva armirano betonska stupa koji su umanjeni modeli stupova Šibenskog mosta. Jedan stup je kompletno rušen, dok se na drugom provelo samo izbijanje betona. Na njima su se provele nerazorne metode ispitivanja (ultrazvuk, resipod, sklerometar) prije i nakon eksplozije kako bi se izmjerene veličine mogle usporediti i kako bi se utvrdilo nastalo oštećenje nakon eksplozije.In the baccalaureus graduate thesis, an analysis of collapsed and damaged concrete bridges, was conducted carried out during the Homeland War. 70 concrete bridges were analyzed according to the characteristics of the structure: the supporting system and the type of support system, age, spatial structure and surface, as well as the realization of the hazard: an explosion (blast loading), a projectile impact or their combination. Bridges are categorized in such a way as to determine which factors mostly influence the percentage of bridge collapse. After the analysis of the collapsed and damaged bridges, two reinforced concrete columns, scale model of the Šibenik Bridge columns, were exposed to blast loading. One column was demolished, outbreak of concrete was conducted on the other column. Non-destructive testing methods are carried out (ultrasound testing, surface electrical resistivity of concrete, compressive strength determined by Schmidt hammer) before and after the explosion to compare results and to determine the damage caused by the blast loading