Cast-in-situ balanced cantilever construction

Cast-in-situ balanced cantilever construction is ideally suited to box section bridges of medium or long span, where there is insuf cient repetition to justify precasting. The method becomeseconomical for bridges with a main span of 60 m and above, and remains viable up tothe largest span that may be built, currently about 300 m.Early cantilever built bridges were pinned at mid-span. However, these bridges have in several instances exhibited unexpectedlylarge creep de ections at mid-span (7.2.4). Furthermore, the presence of anexpansion joint at mid-span affects the ride of the bridge, and is a maintenance liability. Mostmodern cantilever built decks are made continuous by casting a mid-span