EFFECT OF PERFORATED COLLAR SHAPE AND OPENING PERCENTAGE ON SCOURING AROUND BRIDGE PIERS

A. BAGHERI, A. BORDBAR, M. HEIDARNEJAD, A.R. MASJEDI

Abstract


Scouring is considered a major contributor to bridge failure across the world. The expansion of the scour hole can lead to instability of the bridge structure. Consequently, scour depth prediction is considered a common river engineering practice to take necessary controlling measures. Accordingly, this study investigated the impact of perforated collars of different shapes on scouring around bridge piers. It was found that the scour further decreased as the collar shape was changed from triangular to rectangular. By installing triangular, circular, square, and rectangular perforated collars with the same hole diameter (d/D) of 0.1, maximum scour depth respectively decreased by 35.2, 37.4, 38.4, and 50.9% in comparison with the collarless bridge pier. Installation of the triangular, circular, square, and rectangular perforated collars with a hole diameter (d/D) of 0.15 reduced scouring respectively by 27.7, 31.6, 33.4, and 45.8% compared to the collar-less pier. Scouring respectively decreased by 16.6, 22.3, 24.7, and 27.6% compared to the collar-less pier by installing the triangular, circular, square, and rectangular perforated collars with a constant hole diameter (d/D) of 0.2. Scouring increased by 29.7% on average at all velocities as the diameter of the collar hole (d/D) increased from 0.1 to 0.2. Furthermore, scouring increased with increasing velocity. Scouring was found to increase by 94.7% on average with a rise from 0.54 to 0.95 of the flow intensity (V/Vc).


Keywords


Bridge pier, Perforated collar, Scouring, Triangular collar, Rectangular collar, Square collar, Circular collar

Full Text:

PDF

References


ACHOUR B., AMARA L., MEHTA D. (2022 a). Control of the hydraulic jump by a thin-crested sill in a rectangular channel, new experimental considerations Larhyss Journal, No 50, pp. 31-48.

ACHOUR B., AMARA L., MEHTA D., BALAGANESAN P. (2022 b). Compactness of Hydraulic Jump Rectangular Stilling Basins Using a Broad-Crested Sill, Larhyss Journal, No 51, pp. 31-41.

ACHOUR B., AMARA L., MEHTA D. (2022 c). New theoretical considerations on the gradually varied flow in a triangular channel, Larhyss Journal, No 50, pp. 7-29.

ADECHINA A.R.M.A, KELOME C.N., HOUNKPE J.B. (2018). Hydrodynamic sedimentary of the middle delta of the Ouémé River in the context of the current floods, Larhyss Journal, No 33, pp. 93-110. (In French)

AZAM N., GHOMESHI M. (2013). Influence of sacrificial piles on scouring reduction of cylindrical bridge piers, Journal of Water and Soil Science, Vol. 33, Issue 3, pp. 134-123.

CHIEW Y. M. (1992). Scour protection at bridge Piers. Journal of hydraulic engineering, Vol. 118, Issue 9, pp. 1260-1269.

CHIEW Y. M., MELVILLE B. W. (1987). Local scour around bridge Piers, Journal of hydraulic research, Vol. 25, Issue 1, pp. 15-26.

DALAL B., DEB S. (2024). An experimental study on the variation of scour depth for different pier shapes using a tilting flume, Larhyss Journal, No 57, pp. 209-239.

DARGAHI B. (1990). Controlling mechanism of local scouring, Journal of hydraulic engineering, Vol. 116, Issue 10, pp. 1197-1214.

DONGOL D. (1993). Local Scour at Bridge Abutments. PhD Thesis, Civil Engineering, The University of Auckland, New Zealand.

ELAHCENE O., REMINI B., TERFOUS A., GHENAIM A. (2015). Evolution of the concentrations and the sediment discharge according to the liquid flows in the watershed of the wadi Bellah Tipaza, Larhyss Journal, No 21, pp. 169-180.

ESMAILI VARAKI M., JAFARI M., MUSAPOUR, S. (2012). Experimental study of the effect of foundation placement level on the maximum scour of inclined piers group, Paper presented at the 9th International Congress of Civil Engineering, Isfahan, Iran.

ETTEMA R. (1980). Scour at bridge piers. PhD Thesis, Civil Engineering, The University of Auckland, New Zealand.

GHASEMI M., SOLTANI-GERDEFARAMARZI S. (2017). The Scour Bridge Simulation around a Cylindrical Pier Using FLOW-3D? Journal of hydraulic engineering, Vol. 1, Issue 2, pp. 46-54.

GHASEMI ASL M., HEIDARNEJAD M. (2023). A numerical study of the maximum scour depth around inclined bridge piers and comparison with an experimental model, Larhyss Journal, No 56, pp. 55-75.

GHASEMIFARD M., HAYDARPOUR M., SEDAGH M. (2013). Local scour control of rectangular bridge piers in the presence of sacrificial piers, Paper presented at the National Conference on Civil and Sustainable Development in Risk Reduction of Natural Disasters, Mashhad, Khavaran Higher Education Institution.

HAMIDIFAR H., SHAHABI-HAGHIGHI S.M.B., CHIEW Y. M. (2021). Collar performance in bridge pier scour with debris accumulation, International journal of sediment research, Vol. 37, Issue 3, pp. 328-334.

HASSANPOUR N., HOSSEINZADEH DELIR A., ARONAGHI H. (2013). Local scouring around airfoil-shaped bridge piers, Journal of Environmental Health Science and Engineering, Vol. 23, Issue 3, pp. 234 – 221.

JALILI A. (2013). The effect of perforated collar on the scouring of bridge piers, MSc, Shahid Chamran University of Ahvaz, Iran.

MASJEDI A., GHOLAMZADEH MAHMOUDI M. (2011). Experimental study of the effect of the collar in scouring control around cylindrical bridge piers 180° bend of the river, Journal of Agriculture and Natural Resources Abbreviation, Vol. 38, Issue, pp. 27-55.

MEDDI M. (2015). Contribution to the study of solid transport in northern Algeria, Larhyss Journal, No 24, pp. 315-336. (In French)

MEHTA D. J., and YADAF S. M. (2020). Analysis of scour depth in the case of parallel bridges using HEC-RAS. Water Supply, Vol. 20, Issue 8, pp. 3419-3432.

MELVILLE B. W. (1997). Pier and abutment scour: Integrated approach, Journal of hydraulic engineering, Vol. 132, Issue 2, pp. 125-136.

MELVILLE B. W., and SUTHERLAND A.J. (1988). "Design Method for Local Scour at Bridge Piers, Journal of Hydraulic Engineering, Vol. 114, Issue 10, pp. 1210-1226.

MESABAHI M., SHAMSAEI A. (2013). Comparison of the criteria for the selection of riprap for the protection of bridge piers. Paper presented at the Paper presented at the International Conference on Civil Engineering, Architecture and Sustainable Urban Development, Tabriz, Iran.

NAMAEE M. R., SUI J., WU P. (2019). Experimental Study of Local Scour around Side-by-Side Bridge Piers under Ice-Covered Flow Conditions, In The Fluvial Processes and Forms-Dynamics, Delineation and Conservation, 23 p.

RAEISI N., GHOMESHI M. (2021). A laboratory study of the effect of asymmetric-lattice collar shape and placement on scour depth and flow pattern around the bridge pier. Water Supply, Vol. 22, Issue 1, pp. 734–748.

RAUDKIVI A. J. (1988). The roughness height under waves, Journal of hydraulic research, Vol. 26, Issue, pp. 569-584.

SHARIATI H., KHODASHENAS S., ESMAEILI K. (2011). Experimental study of the effect of collar and hole on local scouring at bridge piers, Journal of Civil Engineering and Construction Technology, Vol. 23, Issue 1, pp. 85-96.

VALELA C., RENNIE C. D., NISTOR I. (2022). Improved bridge pier collar for reducing scour, International journal of sediment research, Vol. 37, Issue 1, pp. 37-46.

WANG S., WEI K., SHEN Z., XIANG Q. (2019). Experimental Investigation of Local Scour Protection for Cylindrical Bridge Piers Using Anti-Scour Collars. Water, Vol. 11, Issue 7, pp. 1515.

ZARRATI A. R., AZIZI M. (2001). Scouring control around bridge piers. Journal of Faculty of Engineering, Vol. 35, Issue 1, pp. 21-33.

ZOLGHADR M., ZOMORODIAN S. M. A., FATHI A., TRIPATHI R. P., JAFARI N., MEHTA D., SIHAG P., AZAMATHULLA H.M. (2023). Experimental study on the optimum installation depth and dimensions of roughening elements on abutment as scour countermeasures, Fluids, Vol. 8, Issue 6, pp. 1-14.


Refbacks

  • There are currently no refbacks.


Creative Commons License
This work is licensed under a Creative Commons Attribution 3.0 License.