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Commenced in January 2007 Frequency: Monthly Edition: International Publications Count: 29705

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Studying the Effect of Froude Number and Densimetric Froude Number on Local Scours around Circular Bridge Piers
A very large percentage of bridge failures are attributed to scouring around bridge piers and this directly influences public safety. Experiments are carried out in a 12-m long rectangular open channel flume made of transparent tempered glass. A 300 mm thick bed made up of sand particles is leveled horizontally to create the test bed and a 50 mm hollow plastic cylinder is used as a model bridge pier. Tests are carried out with varying flow depths and velocities. Data points of various scour parameters such as scour depth, width, and length are collected based on different flow conditions and visual observations of changes in the stream bed downstream the bridge pier are also made as the scour progresses. Result shows that all three major flow characteristics (flow depth, Froude number and densimetric Froude number) have one way or other affect the scour profile.
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[1] Kouchakzadeh, S. and Townsend, R.D. (1997), “Maximum scour depth at bridge abutments terminating in the floodplain zone”, Canadian Journal of Civil Engineering, Vol. 24, pp.996-1006.
[2] Lagasse, P.F. and Richardson, E.V. (2001), “ASCE compendium of stream stability and bridge scour papers”, Journal of Hydraulic Engineering, ASCE, Vol. 127, pp.531-533.
[3] Rao, S.K., Sumner, D., Balachandar, R. (2004). A Visualization Study of Fluid‐Structure Interaction between a Circular Cylinder and a Channel Bed. Journal of Visualization, 7 (4), 187‐199.
[4] Wardhana, K., Hadipriono, F. (2003). Analysis of Recent Bridge Failures in the United States. Journal of Performance of Constructed Facilities, 17 (3), 144‐150.
[5] Ettema, R., Melville, B., and Barkdoll, B. “Scale Effects in Pier-Scour Experiments.” Journal of Hydraulic Engineering, ASCE, 124 (6), 1998, 639–642.
[6] Chock, G., Robertson, I., Kreibel, D., Francis, M., Nistor, I. “Tohoku, Japan, Earthquake and Tsunami of 2011 – Performance of Structures under Tsunami Loads.” ASCE ISBN: 978-0-7844-1249-7, 2013.
[7] Edge, B. L, COPRI Chili Earthquake Investigation Team, “Chile Earthquake and Tsunami of 2010.” ASCE ISBN: 978-0-7844-1279-4, 2013.
[8] Francis, M. “Tsunami Inundation Scour of Roadways, Bridges and Foundations: Observations and Technical Guidance from the Great Sumatra Andaman Tsunami”. EERI / FEMA 2006 Professional Fellowship Report, 2006.
[9] Ghobarah, A., Saatcioglu, M., Nistor, I. “The impact of the 26 December 2004 earthquake and tsunami on structures and infrastructure.” Engineering Structures, Vol. 28, 312–326, 2005.
[10] Iemura, H., Pradono, M. H., Yasuda, T. and Tada, T., “Experiments of Tsunami Force Acting on Bridge Models”, Journal of Earthquake Engineering, JSCE, Vol. 29, 531-536, 2007.
[11] Lin, C., Bennet, C, Han, J., Parsons, R., L. “Integrated Analysis of the Performance of Pile-supported Bridges Under Scoured Conditions.” Engineering Structures, Vol. 36, 27-38, 2012.
[12] Jeremic, B., Kunnath, S. and Xiong, F., “Influence of Soil-Foundation-Structure Interaction on Seismic Response of the I-880 Viaduct”, International Journal of Engineering Structures, Vol. 26, Issue 3, 391-402, 2004.
[13] Nezu, I. “Open-channel flow turbulence and its research prospect in the 21st century.” Journal of Hydraulic Engineering, 131(4), 2005, 229-246.
[14] Rusch, E. “Floods destroy or damage more than 50 bridges in Colorado.” The Denver Post. Published: September 15, 2013. Updated: April 29, 2016.
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