The National Bridge Research Organization (NaBRO) has developed a competitive steel bridge system known as “steel bridge system with simple girder for dead load and continuous girder for live load” In the proposed system, the girders are designed as simply supported to resist construction loads and as continuous after hardening of the concrete. We investigated in this paper the cost-benefit of the new steel bridge system as compared with that of the conventional system. In this study, two girder bridges (one for I-girder bridge and one for box girder bridge) that have been already constructed in the U.S. are selected and then the bridges are designed using two methods: the conventional method and the newly proposed concept. Changes in steel girder weights, costs, and construction schedules are mainly discussed.
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