Although PSC girder bridges are widely applied to highway bridge, cross beams are considered as secondary member, not primary. Using simplified and/or experimental formula, five equi-spaced cross beams are conventionally designed in the field depending on standard drawings. Since structural damages are found frequently in the connection between girder and cross beam under traffic loads, the number of cross beams are reported to decrease in design of railway bridge like highway bridge. This study presents the possibility or applicability to decrease the number of cross beams of PSC girder railway bridge.

This study presents the comparison or distribution of the dynamic responses with or without soil-structure interaction. As a result, the maximum dynamic displacements and member forces of the suspension bridge with the soil-structure interaction (SSI) are larger than those without SSI. Therefore, the SSI analysis of suspension bridge must be performed more exactly to represent its dynamic responses.