Abstract
The deck slab of a prestressed concrete (PSC) box girder bridge serves as an integral part of the structural box section, and any damage to the deck may seriously affect the load-resistance mechanism of the bridge. This paper discusses a case study of a PSC box girder that developed early damage to the deck because of the poor placement of concrete at the time of construction as established by in situ non- destructive and core tests. The possibility of total replacement of the top deck was ruled out because of the disruptive and tedious nature of the process, which could have endangered the overall stability of the box girder. Strengthening of the deck was performed by installing a series ofsteeljoistsattheundersideofthedeckslabandaddingathinoverlayofconcreteatthetoptorestoreittotherequisitestrength.Thisapproach was bestsuited, foritnotonlyimprovedthestressdistributioninthedeck,butalsomaintainedtheoriginalloadresistancemechanism provided by the prestressing arrangement in thegirder. The presented scheme was easy to implement and could beused for similar damages occurring to the deck of PSC box girder bridges. DOI: 10.1061/(ASCE)BE.1943-5592.0000318. © 2013 American Society of Civil Engineers. CE Database subject headings: Rehabilitation; Bridge decks; Prestressing; Box girders; Case studies. Author keywords: Rehabilitation; Bridge deck; Prestressed; Box girder.
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