نوع مقاله: مقاله پژوهشی
نویسندگان
1 دانشگاه صنعتی شاهرود
2 دانشگاه آزاد واحد دزفول
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسنده [English]
The statistics of bridge failures by US Federal Highway Administration show that the local scour around the bridge abutment is main reason compared to the local scour of piers. Various methods have been suggested for the control and reduction of local scour around the bridge piers and abutment. Using submerged vanes is one of these methods. In this study, the effect of submerged vanes to reduce the local scour around the bridge abutments with rounded nose was studied. Experiments conducted in a compound channel with non-cohesive sediments with diameter (d50) of 1 mm. Experiments carried out in two stages: in first stage without using submerged vanes and at the second stage with the presence of submerged vanes. Two rows of submerged vanes with length of 10 cm, height of 3.33 cm (L/H =3) and with angle of 20° was used. The results showed that the geometric properties of the scour hole in the nose of abutment was similar to the results obtained by other researchers. Results also showed that at all flow conditions submerged vanes reduced the scour hole around the bridge abutment and they moved the scour hole from the near of the abutment to the center of channel. Also the results showed that using submerged vanes averagely reduced 60.1% of the maximum scour depth. Finally the best layout of submerge vanes which had a distance of 5 and 15 cm between first and second rows with abutment, reduced the maximum scour depth by 71.74 percent.
Keywords: Abutment, Compound Channel, Local Scour, Submerged Vanes
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