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Prior to modern seismic provisions, several bridges were not designed for seismic actions in moderate seismic areas. Precast multi-girder and slab bridges are typical highway overpass structures, they have a signiďŹcant contribution to national bridge stocks. Since the seismic behavior is questionable, a preliminary parametric study is conducted to determine critical conďŹgurations and components. The results indicate that the behavior of the abutments, backďŹll soil, superstructure and foundation is normally satisfactory; however, the superstructure-abutment joints are critical for both single and multi-span bridges, while the piers are also critical for longer multi-span conďŹgurations. The parametric results provide a solid basis both for detailed seismic assessment and development of design concepts of newly built structures in moderate seismic zones.
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