Rehabilitation of arch bridge across Lepenica river in Kragujevac
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In this paper damages and rehabilitation of bridge across Lepenica River in Kragujevac are presented. The bridge is reinforced concrete tied-arch structure. Main girders (two arches) have a span of 31.5 m and they are supported by massive riverside columns. Bridge deck is composed of a deck slab and secondary longitudinal and transverse girders. The transverse elements are overhanging beams, with the slab on the overhangs representing footpaths. The bridge was built in 1923. Due to inadequate maintenance and exposure to adverse climatic conditions, damages of deck, secondary longitudinal and transverse beams, main supports (arches, tie beams, hangers), bearings and expansion joints have occurred. In order to ensure lasting stability, safety and functionality, certain repair interventions had to be undertaken. In the previous period, various bridge repairs have been performed, the last one being in 1998. The main damages of structural elements were concrete protective layer de...gradation, corroded reinforcement and occasional cracks. The damaged concrete surface was completely removed, until healthy parts were reached. The concrete was sandblasted and the reinforcement was cleaned of corrosion. The reinforcement was protected using the appropriate material, with bonding coating and repair mortar applied afterwards. Footpath decks have been significantly damaged, and there were even "caverns" where the concrete was completely destroyed. Repair was done by completely removing the existing slabs and replacing them with new ones. Due to moisture and reinforcement corrosion, the joints between the hangers and the tie beams were particularly vulnerable. During the previous repairs, steel frames were attached around the tie beams and connected to the hangers. The most serious damages occurred on the bottom of individual frames. Damages were manifested as separation of parts of the steel elements, which significantly reduced the cross-sections. All steel frames were sandblasted and cleaned from corrosion. For steel frames requiring more serious repair, new steel profiles were mounted. Afterwards, the frames were protected by appropriate anti-corrosion coatings. The extent of damages to the expansion joints required their replacement.
Keywords:RC arch bridge / condition assessment / damages / corrosion / repair interventions
Source:Proceedings of The Seventh International Conference Civil Engineering Scienece & Practice - GNP2020, 2020
- UNIVERSITY OF MONTENEGRO FACULTY OF CIVIL ENGINEERING