تعداد نشریات | 161 |
تعداد شمارهها | 6,532 |
تعداد مقالات | 70,501 |
تعداد مشاهده مقاله | 124,114,891 |
تعداد دریافت فایل اصل مقاله | 97,218,771 |
تعیین عمق و ابعاد بهینه المانهای زبری بر روی تکیهگاه پل برای کاهش میزان آبشستگی | ||
تحقیقات آب و خاک ایران | ||
مقاله 17، دوره 50، شماره 8، دی 1398، صفحه 2051-2061 اصل مقاله (1.15 M) | ||
نوع مقاله: مقاله پژوهشی | ||
شناسه دیجیتال (DOI): 10.22059/ijswr.2019.272311.668080 | ||
نویسندگان | ||
ندا جعفری1؛ سید محمد علی زمردیان* 2؛ مسیح ذوالقدر3 | ||
1دانشجوی کارشناسی ارشد، گروه سازه های آبی، بخش مهندسی آب، دانشکده کشاورزی، دانشگاه شیراز، شیراز، ایران | ||
2عضو هیئت علمی، گروه سازه های آبی، بخش مهندسی، دانشکده کشاورزی، دانشگاه شیراز، شیراز، ایران | ||
3بخش مهندسی آب دانشگاه جهرم، جهرم، ایران | ||
چکیده | ||
در سالهای اخیر دلیل تخریب بسیاری از پلها آبشستگی تکیهگاه اعلام شده است. تحقیقات بسیاری به کم کردن آبشستگی تکیهگاه به کمک سازههایی که اثر تخریبی جریان را بهبود میبخشند پرداختهاند. در این مطالعه به بررسی آبشستگی آب زلال در دو تکیهگاه عمودی با عرضهای مختلف پرداخته شده است. دیوارهی بالادست تکیهگاه با المانهایی برای کاهش گردابههای نعل اسبی محافظت شده است. اندازههای مختلف المانها با ضخامت و پیشآمدگی برابر با L025/0، L05/0، L1/0، L2/0، L3/0 (L برابر با طول تکیهگاه) و در ارتفاعهای مختلف کارگذاری بر دو تکیهگاه با طول برابر و عرض یکی دو برابر دیگری مورد بررسی قرار گرفتهاند. ارتفاع بهینه اعمال زبری، برابر با L6/0 زیر سطح رسوب به دست آمد. با بزرگتر شدن ابعاد المانها تا ضخامت و پیشآمدگی L2/0، آبشستگی اطراف تکیهگاه کم میشود و پس از آن با بزرگتر شدن المانها آبشستگی افزایش پیدا میکند. کارگذاری المانهای با ضخامت و پیش آمدگی L2/0 در عمق L6/0 زیر رسوب بر تکیهگاه با عرض کمتر، کاهش آبشستگی به میزان 4/30 درصد و بر تکیهگاه با عرض بیشتر کاهش آبشستگی به میزان 8/32 درصد را نتیجه داد. | ||
کلیدواژهها | ||
آبشستگی تکیهگاه؛ المانهای زبری؛ عمق بهینه کارگذاری | ||
عنوان مقاله [English] | ||
Determination of Optimum Depth and Dimensions of Roughening Elements on Bridge Abutment as Scour Countermeasures | ||
نویسندگان [English] | ||
Neda Jafari1؛ Seyed Mohammad Ali Zomorodian2؛ masiih zolghadr3 | ||
1Msc Student, Agriculture engineering-Hydraulic structures, Shiraz University, Shiraz, Iran | ||
2Facility, Agriculture Engineering- Hydraulic structures, Shiraz University, Shiraz, Iran | ||
3Assistant professor, water Eng. Dept. jahrom University, Jahrom, Iran | ||
چکیده [English] | ||
In the recent years, the failure of many bridges has reported due to local scour around abutment. Many studies have focused on reducing the scour with the help of structures reducing the destructive effects of flow. In this study, the scouring effect on two vertical wall abutments with different widths was investigated using clean water. Where the upstream face of the latter is protected with roughening elements as devices to intercept the down flow responsible for the formation of the principal vortex. Different sizes of the elements with thicknesses and protrusions equal to 0.025L, 0.05L, 0.1L, 0.2L and 0.3L (L is the length of the abutment) placed at different elevations on abutments were investigated. The optimum elevation of roughening elements obtained at 0.6L below the bed level. As the thickness and protrusion dimensions of the elements increases to 0.2L, scour depth around the abutment decreases, and after that increases if the element size become larger. In conclusion, the roughening elements with thickness and protrusion equal to 0.2L and placement of 0.6L below the sediment bed reduced the scour depth 30.4 and 32.8% at the small and large abutments, respectively. | ||
کلیدواژهها [English] | ||
Abutment Scour, Roughening Elements, Optimum Application Depth of Roughening Elements | ||
مراجع | ||
Ballio, F., Teruzzi, A., & Radice, A. (2009). Constriction effects in clear-water scour at abutments. Journal of Hydraulic Engineering, 135(2), 140-145. Bozkus, Z., & Yildiz, O. (2004). Effects of inclination of bridge piers on scouring depth. Journal of Hydraulic Engineering, 130(8), 827-832. Breusers, H. N. C., & Raudkivi, A. J. (1991). Scouring. Hydraulic Structures Design Manual2. Balkerna, Rotterdam, The Netherlands: IAHR. Cardoso, A. H., & Fael, C. M. (2009). Protecting vertical-wall abutments with riprap mattresses. Journal of Hydraulic Engineering, 135(6), 457-465. Chiew, Y. M. (1992). Scour protection at bridge piers. Journal of Hydraulic Engineering, 118(9), 1260-1269. Dargahi, B. (1990). Controlling mechanism of local scouring. Journal of Hydraulic Engineering, 116(10), 1197-1214. Fathi, A., & Zomorodian, S. M. A. (2018). Effect of Submerged Vanes on Scour Around a Bridge Abutment. KSCE Journal of Civil Engineering, 22(7), 2281-2289. Heidarpour, M., Afzalimehr, H., & Izadinia, E. (2010). Reduction of local scour around bridge pier groups using collars. International Journal of Sediment Research, 25(4), 411-422. Hossainreza, A.A. (2017). Investigation the Joined Effect of Riprap and Six Legged Elements (SLC) Installation on Scour Depth Mitigation at Vertical Wall Bridge Abutments. Journal of Irrigation Science and Engineering. Ahvaz: Iran. Johnson, P. A., Hey, R. D., Tessier, M., & Rosgen, D. L. (2001). Use of vanes for control of scour at vertical wall abutments. Journal of Hydraulic Engineering, 127(9), 772-778. Khademi, Kh. & Shafai Bajestan, M. (2015). Annalysing the Effect of Number, Location and Angle of Submerged Plates on Abutment. Iranian Water Studies, 8(15) 145-153. Khazimenejad, H., Ghomeishi, M., & Shafai Bajestan, M. (2014). Comparison of Symmetrical and Unsymmetrical Rectangular Collars on Reduction of Local Scour at Bridge Abutment. Journal of Irrigation Science and Engineering, 37(2), 1-12. Kirkgöz, M. S., & Ardiçlioğlu, M. (1997). Velocity profiles of developing and developed open channel flow. Journal of Hydraulic Engineering, 123(12), 1099-1105. Korkut, R., Martinez, E. J., Morales, R., Ettema, R., & Barkdoll, B. (2007). Geobag performance as scour countermeasure for bridge abutments. Journal of Hydraulic Engineering, 133(4), 431-439. Kumar, V., Raju, K. G. R., & Vittal, N. (1999). Reduction of local scour around bridge piers using slots and collars. Journal of Hydraulic Engineering, 125(12), 1302-1305. Li, H., Barkdoll, B. D., Kuhnle, R., & Alonso, C. (2006). Parallel walls as an abutment scour countermeasure. Journal of Hydraulic Engineering, 132(5), 510-520. Mashahir, M. B., Zarrati, A. R., & Mokallaf, E. (2009). Application of riprap and collar to prevent scouring around rectangular bridge piers. Journal of Hydraulic Engineering, 136(3), 183-187. Melville, B. W. (1992). Local scour at bridge abutments. Journal of Hydraulic Engineering, 118(4), 615-631. Melville, B. W., & Sutherland, A. J. (1988). Design method for local scour at bridge piers. Journal of Hydraulic Engineering, 114(10), 1210-1226. Melville, B., Van Ballegooy, S., Coleman, S., & Barkdoll, B. (2006). Countermeasure toe protection at spill-through abutments. Journal of Hydraulic Engineering, 132(3), 235-245. Melville, B., Van Ballegooy, S., Coleman, S., & Barkdoll, B. (2006). Scour countermeasures for wing-wall abutments. Journal of Hydraulic Engineering, 132(6), 563-574. Mohammadpour, R., Ghani, AAB. and Azamathulla, HM. (2013). Estimation of dimension and time variation of local scour at short abutment. International Journal of River Basin Management 11(1): 121-135. Naeemi Nobandegani, H., & Heidarpour, M. (2014). Studying the Effect of Roughening Elements on Reduction of Scour Around Abutments (pp.1-8). 13th Iranian Hydraulics conference, Tabriz University, Iran. Pagliara, S., Hassanbandi, L.S., & Kurdistani, S.M. (2015). Log-Vane Scour in clear water Condition. Journal of River Research and Applications, 31(9), 1176–1182. Radice, A., & Davari, V. (2014). Roughening elements as abutment scour countermeasures. Journal of Hydraulic Engineering, 140(8), 1-7. Rajaratnam, N., & Nwachukwu, B. A. (1983). Erosion near groyne-like structures. Journal of Hydraulic Research, 21(4), 277-287. Raudkivi, A. J., & Ettema, R. (1983). Clear-water scour at cylindrical piers. Journal of Hydraulic Engineering, 109(3), 338-350. Raudkivi, A. J. (1998). Loose boundary hydraulics, The Netherlands: A. A. Balkema. Richardson, E. V., Harrison, L. J., Richardson, J. R., & Davies, S. R. (1993). Evaluating scour at bridges. Washington, DC., USA: Federal Highway Administration. US Department of Transportation. Sui, J., Afzalimehr, H., Samani, A. K., & Maherani, M. (2010). Clear-water scour around semi-elliptical abutments with armored beds. International Journal of Sediment Research, 25(3), 233-245. Vittal, N., Kothyari, U. C., & Haghighat, M. (1994). Clear-water scour around bridge pier group. Journal of Hydraulic Engineering, 120(11), 1309-1318. Xiong, X., Melville, B.W., Feriedrich, H., (2013). Effect of contraction length on abutment scour. Proceedings of the International IAHR World Congress. Zarrati, A. R., Gholami, H., & Mashahir, M. B. (2004). Application of collar to control scouring around rectangular bridge piers. Journal of Hydraulic Research, 42(1), 97-103. Zarrati, A. R., Chamani, M. R., Shafaie, A., & Latifi, M. (2010). Scour countermeasures for cylindrical piers using riprap and combination of collar and riprap. International Journal of Sediment Research, 25(3), 313-322. Zolghadr. M., Shafai Bejestan. M., & Fathi, A. (2016). Effect of Density and Depth of Six-Legged Elements Placement on Rectangular Abutment Scour Depth. Water and Soil Sience, 26(4.1), 119-135. Zolghadr. M. & Shafai Bejestan. M. (2018). Effect of Six-Leg Elements installation arrangement on bed topography around Wing-Wall Abutments. Journal of Water Resources Engineering, 11(36), 47-58. | ||
آمار تعداد مشاهده مقاله: 439 تعداد دریافت فایل اصل مقاله: 411 |