Abstract

The Carlos Ib & aacute;& ntilde;ez del Campo Bridge, built in 1926, is a historic concrete arch bridge located in the northern part of Chilean Patagonia. Since 2017, it has been protected as a National Monument by the Chilean government. In this study, a bridge design load rating according to AASHTO was performed including geometric and damage surveys, non-destructive testing, and a structural analysis using a finite element model. Only localised damage, including efflorescence, concrete spalling, and incipient corrosion of the reinforcement was found without affecting the structural capacity. However, in the arch, the bottom concrete cover has detached over 5% of its length, which has been taken into consideration by a condition factor of 0.95. The results are expressed as utilisation ratios of combined dead and live load demand to structural capacity. For the arches, arch diaphragms, transverse beams and deck slab, the maximum utilisation ratio is below 50%. The grillage beams of the deck slab and the columns exhibit higher utilisation ratios, reaching a maximum of 74.8%. It is concluded that the bridge possesses sufficient structural capacity to sustain current modern traffic loads, and will continue to represent an exemplary, strong, and durable concrete bridge from the early 20th century.