This paper presents a novel graphic

This paper presents a novel graphical aid that allows designers toestimate the magnitude of the stresses due to moment redistributioncaused by creep. The proposal is particularly attractive because ofits simplicity. It can be applied in less than 1 min as a final check,or as guidance during the proportioning phase of the structure.It requires only hand calculations.During construction of the cantilever arms, the moment produced by the eccentric post-tensioning (MPT) (top cables) opposesthe moment induced by self-weight (MSW) to prevent cracking andto control deflections. Experience has shown, however, that creepmay induce large long-term deflections in cantilever bridgesand/or tension stresses in the bottom fibers of the soffit, leading toserviceability problems, including cracking, corrosion of reinforcement, and loss of stiffness. A memorable example is the Koror–Babelthuap Bridge built in 1977, commonly known as PalauBridge, which held the world record for the longest span builtby the cantilever method [240 m (787 ft)]. The box girder washinged at midspan and exhibited deflections from creep larger than1.2 m (3.94 ft). External post-tensioning was applied to the boxgirder to control deflections of the cantilever arms, but the structurecollapsed unexpectedly six months after the retrofitting in 1996.More information on this collapse was reported by Tang (2014).