نوع مقاله : مقاله پژوهشی
نویسندگان
گروه مهندسی سازه های آبی، دانشکده مهندسی علوم آب، دانشگاه شهید چمران اهواز، اهواز، ایران
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسنده [English]
The problem of scouring the piers of bridges which has attracted the attention of the specialists of
hydraulic sciences for decades. So far, various methods have been proposed to prevent scouring
that using netted collar is one of these methods. In this research, the effect of the presence of
netted collar on scouring of the bridge cylindrical pile group at clear flow conditions has been
investigated. For this purpose, a flume with length of 6m and width of 73cm was used and the
effect of the collars of 0, 30, 50 and 70 percentage of the netted was tested at the levels of 0.5D
above the bed (D is the pier diameter) and on the bedduring 9 experiments. On the bed level, all collars had high efficiency and the 30-percent of opening could to control the scour around the first pier
completly. At the level of 0.5D, the 30 percent netted collar reduced the scour depth by 58
percent, While the efficiency of 0, 50, and 70% Netted Collars at this level were 4, 0 and 15 percent, respectively. In general, with the reduction of collar level, efficiency was increased.
کلیدواژهها [English]
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