Aerodynamic Analysis of Simple Girder Bridges under Construction Phase

Bridge designs are becoming slender and lighter, making wind dynamic effects even more important than static effects. Some types of bridges show especially vulnerable situations during construction stages, when the structure is lighter or does not have its final stiffness. The aim this document to assess loading on simple girder their phases. studied section formed by two steel beams supporting a concrete slab, but analysis was made slab has been built yet. Several CFD simulations were find aerodynamic parameters depending section’s dimensions. Three stages analyzed: only one beam placed, both in locations they connected yet, joined bracing. results showed that vortex shedding stronger along-wind direction due low horizontal bending stiffness large area perpendicular flow. Increasing beams’ distance good solution reduce However, closing with light plates effective, decreasing frequency