STUDY ON INTERFERENCE EFFECT OF AERODYNAMIC FORCE OF TWIN SEPARATE FLAT BOX GIRDERS

The interference effect of aerodynamic forces of twin separate flat box girders were investigated by wind tunnel tests of sectional models. The interference-factor changing curves of aerodynamic coefficients versus separate distance were obtained. The research results show that the interference effect of drag coefficient of a forward box girder is slight. The interference effect of drag coefficient of a leeward box girder can be neglected when D/B≥2 and can be recognized as a reducing effect when D/B< 2. This reducing effect is more remarkable for a small distance. The interference effect of lift coefficient of a leeward box girder is slight. The interference effect of lift coefficient of a forward box girder can be neglected when D/B≥2 and can be recognized as a reducing effect when D/B< 2.