The study of Effect of Relative Diameter and depth of installation of Lattice Collar on Scouring around Airfoil Bridge Piers

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Mohammadian A.R.; BORDBAR A.; MASJEDI A.R.; Kamanbedast a.a.; Heidarnejad M.

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Journal: Journal of Water and Soil Conservation Year:2020 | Volume:26 | Issue:6 Page(s): 159-177

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Title

The study of Effect of Relative Diameter and depth of installation of Lattice Collar on Scouring around Airfoil Bridge Piers

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Keywords

AerodynamicsQ1

BridgeQ1

Flow-3DQ2

Lattice collarQ1

Physical modelQ2

ScourQ1

Abstract

Background and Objectives: One of the main reasons for the failure of Bridges in the United States and around the world is Scouring. The flow characteristics, the base shape and the angle of its deposition relative to the flow and characteristics of the sediments are all factors that interfere with the complexity of the Scouring problem of Bridges. It should be noted that the final Scour depth created near the Bridge base is equal to the total erosion depth due to local, general and narrowing of the flow width. Since the propagation of the Scour hole threatens the sustainability of the Bridge structure, predicting the amount of dirt and adopting the necessary measures for its containment are considered as common engineering measures in river engineering. Materials and Methods: In this study, the effect of air foil Lattice collars on aerodynamic Bridge foundations was investigated. In order to investigate the research in this study, a flume was used at Azad University of Ahvaz with the following characteristics. The input and output channels of the flume are a rectangular weirs with a Plexiglas sheet, so that the length of the direct input channels at the beginning of the flume and the output at the end of the flume are 4. 5 and 2. 5 meters, respectively, the width and height of the flume are 0. 5 and 0. 6 meters and the body of the flume is at a height of 0. 7 meters from the ground. Results: By installing the collar at a relative depth of 0. 1, the length of the collars of the Scouring net was reduced compared to the collarless base. By installing the collar at a relative depth of 0. 5, the Lattice collars with relative lengths of 6, 8 and 10 were 35. 2, 37. 4 and 38. 4 percent, respectively, to reduce Scouring compared to the collarless base. Also, by installing the collar at relative depth (Z/D)=1 with a length (L/D) of 6, 8 and 10, collars were 27. 7, 31. 6 and 31. 4 percent compared with a collarless Bridge pier, respectively. By increasing relative velocity (V/Vc) from 0. 54 to 0. 95, on average, the Scouring increased by 113. 8%. By installing the collar at a relative depth (Z/D) of 0. 1, 0. 5 and 1, 16. 6, 35. 2 and 27. 7 percent lower Scouring were observed compared with the collarless base. Also, by increasing the depth of the lattice aerodynamic collars the Scour reduction decreased by 22. 3 percent. Conclusion: It can be concluded that the best depth of the collar is about half the diameter of the base of the Bridge. Also, simulation with the Flow-3D math model is close to the Physical model and has an average of only 4. 5% error, which is acceptable.

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APA: Copy

Mohammadian, A.R., BORDBAR, A., MASJEDI, A.R., Kamanbedast, a.a., & Heidarnejad, M.. (2020). The study of Effect of Relative Diameter and depth of installation of Lattice Collar on Scouring around Airfoil Bridge Piers. JOURNAL OF WATER AND SOIL CONSERVATION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES), 26(6 ), 159-177. SID. https://sid.ir/paper/409271/en

Vancouver: Copy

Mohammadian A.R., BORDBAR A., MASJEDI A.R., Kamanbedast a.a., Heidarnejad M.. The study of Effect of Relative Diameter and depth of installation of Lattice Collar on Scouring around Airfoil Bridge Piers. JOURNAL OF WATER AND SOIL CONSERVATION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES)[Internet]. 2020;26(6 ):159-177. Available from: https://sid.ir/paper/409271/en

IEEE: Copy

A.R. Mohammadian, A. BORDBAR, A.R. MASJEDI, a.a. Kamanbedast, and M. Heidarnejad, “The study of Effect of Relative Diameter and depth of installation of Lattice Collar on Scouring around Airfoil Bridge Piers,” JOURNAL OF WATER AND SOIL CONSERVATION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES), vol. 26, no. 6 , pp. 159–177, 2020, [Online]. Available: https://sid.ir/paper/409271/en

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