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Effect of girder spacing on the construction cost and seismic performance of slab-on-prestressed concrete girder highway bridges

Duran, Burak Çağrı
This study examines the effect of using different girder spacing on the total bridge construction cost in varied seismic zones. For this purpose, a number of structural models are built utilizing the finite element analysis to study the superstructure and substructure of a benchmark bridge in detail. Using these models, related parametric analyses are conducted for altering girder spacing, span lengths, number of spans, column heights, soil types and seismic zones. Ninety-five bridges with distinct types of superstructures and substructures are then designed and analyzed. Finally, pertinent construction costs are estimated for each bridge model under consideration. Comparison of costs revealed that an increase in girder spacing leads to a decrease in the total bridge construction cost. Moreover, seismic performance analyses of the bridges showed that no considerable change in terms of seismic performance observed with the increase in the girder spacing.