EFFECT OF COLLAR ON TIME DEVELOPMENT AND EXTENT OF SCOUR HOLE AROUND CYLANDRICAL BRIDGE PIERS
محل انتشار: ماهنامه بین المللی مهندسی، دوره: 25، شماره: 1
سال انتشار: 1390
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 783
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شناسه ملی سند علمی:
JR_IJE-25-1_002
تاریخ نمایه سازی: 17 خرداد 1393
چکیده مقاله:
An experimental approach was carried out to study the time development and extension of scouring around a circular pier protected by collars. The experiments included the study of scouringaround an unprotected pier as well as the pier protected with collars located at different levels. Width ofcollars was 3 times the pier diameter. It was found that with collars, though the scour depth and the rate of scouring decrease, extent of the scour hole increases. Number of collars and their levels are effective factors on the equilibrium depth and extension of scouring. Different collar arrangements were tested foran optimum result. Best results were found with one collar at the bed level and another one at one pier diameter below the bed level. In this arrangement, scouring did not penetrate below the lower collar even after 200 hours. Therefore, with the lower collar at 1D below the bed level scour depth reduced by more than 50% whereas, the area of scouring increased by 30% compared with an unprotected pier
کلیدواژه ها:
نویسندگان
m Karimaee-Tabarestani
Dept. of Civil and Environmental Engineering, Amirkabir University of Technology, Tehran, Iran
a.r Zarrati
Dept. of Civil and Environmental Engineering, Amirkabir University of Technology, Tehran, Iran