Abstract
AbstractCreep, shrinkage, and temperature drops will shorten the main girder and create additional internal forces in the piers of continuous rigid-frame bridges. Horizontal jacking forces can be applied at the ends of a closure segment before casting to improve the stress state in the piers. Multispan continuous rigid-frame bridges have several closure segments and usually have different jacking forces. In general, the determination of the optimal jacking forces is relatively difficult because of their compound effects on the bridge piers. In this study, multiobjective linear programming was used to calculate the jacking forces by selecting the stress in the piers as the objective function in the service stage and the stresses at the various construction stages as constraints. The minimum tensile stress in the piers was obtained by an iterative process that allowed for the creep effect of the jacking forces to be included in the calculations. The results obtained show that the proposed method is convenie...
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