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Reduction of Local Scour in the Vicinity of Bridge Pier Groups Using Collars and Riprap |
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| Authors: | A. R. Zarrati M. Nazariha M. B. Mashahir |
| Affiliation: | 1Associate Professor, Dept. of Civil Engineering, Amirkabir Univ. of Technology, No. 424, Hafez, Ave., 15914, Tehran, Iran. E-mail: zarrati@aut.ac.ir 2Assistant Professor, Faculty of Environment, Dept. of Civil and Environmental Engineering, Univ. of Tehran, No. 25, Ghods St., Tehran, Iran. E-mail: nazariha@ut.ac.ir 3PhD Student, Dept. of Civil Engineering, Amirkabir Univ. of Technology, No. 424, Hafez, Ave., 15914, Tehran, Iran. E-mail: m.b.mashahir@aut.ac.ir |
| Abstract: | The present study examines the use of independent and continuous pier collars in combination with riprap for reducing local scour around bridge pier groups. The efficiency of collars was studied through experiments. The data from the experiments were compared with data from earlier studies on single piers with collars and bridge pier groups without collars. The data showed that in the case of two piers in line, combination of continuous collars and riprap results in the most significant scour reduction of about 50 and 60% for the front and rear piers, respectively. In other cases for two piers in line, independent collars showed better efficiency than a continuous collar around both piers. It was also shown that efficiency of collars is more on a rectangular pier aligned with the flow than two piers in line. Experiments however, indicated that collars are not so effective in reduction of scouring around two transverse piers. |
| Keywords: | Scour Bridges, piers Riprap |