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<p>This paper presents the experimental results of use of six pillars concrete (SPC) elements for their permeability providing water resistance and its stability as counter measure against bridge pier scour. To reach such goals, two series of experiments were performed with and without SPC elements around a cube bridge pier in one, two and three installation rows and different flow conditions [(Fr) is Froude number = 0.16, 0.17, 0.19, 0.22 and 0.24]. The results show that SPC elements have been able to achieve the maximum scour depth reduction of 44%, 83% and 100% in one, two and three rows experiment at lower Fr. The experiments were carried out in a 7.3-m Plexiglas flume under controlled laboratory conditions. Flow was regulated using a pump, inlet filter, and slide gate, and measurements were taken after passing a standard triangular weir. Scour depth increased with higher Froude numbers in all tests, but the presence of SPC elements consistently reduced scour depth, demonstrating their effectiveness across all flow conditions. The use of SPC elements led to an average scour depth reduction of 30% for one row, 73% for two rows, and 93% for three rows. The reduction ranged from 7 to 98% depending on the number of rows and flow conditions. These results highlight the effectiveness of multi-row SPC placements in mitigating pier scour under clear water conditions. </p>

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Enhancing the Bridge Pier Scour Reduction Using the Six Pillars Concrete Elements

  • 期刊论文

  • 发表日期：

    2025年6月1日

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  • Mahmood Shafai Bejestan,
  • Narges Raeisi,
  • Kimiya Kamaei

摘要

This paper presents the experimental results of use of six pillars concrete (SPC) elements for their permeability providing water resistance and its stability as counter measure against bridge pier scour. To reach such goals, two series of experiments were performed with and without SPC elements around a cube bridge pier in one, two and three installation rows and different flow conditions [(Fr) is Froude number = 0.16, 0.17, 0.19, 0.22 and 0.24]. The results show that SPC elements have been able to achieve the maximum scour depth reduction of 44%, 83% and 100% in one, two and three rows experiment at lower Fr. The experiments were carried out in a 7.3-m Plexiglas flume under controlled laboratory conditions. Flow was regulated using a pump, inlet filter, and slide gate, and measurements were taken after passing a standard triangular weir. Scour depth increased with higher Froude numbers in all tests, but the presence of SPC elements consistently reduced scour depth, demonstrating their effectiveness across all flow conditions. The use of SPC elements led to an average scour depth reduction of 30% for one row, 73% for two rows, and 93% for three rows. The reduction ranged from 7 to 98% depending on the number of rows and flow conditions. These results highlight the effectiveness of multi-row SPC placements in mitigating pier scour under clear water conditions.