|dc.description.abstract||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 degradation, 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.||en