The effect of flow velocity on local scaling around hexagonal pillars (laboratory model test)

2017 1st International Conference on Engineering and Applied Technology

Al Imran, H.^1 ; Nenny^1

Department of Civil Engineering, University of Muhammadiyah Makassar, Makassar, Sulawesi Selatan, Indonesia^1

关键词: Dynamic nature;    Hexagonal cross-sections;    Laboratory model test;    Local scaling;    Local scour depths;    Running time;    Space and time;    Vortex systems;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/403/1/012015/pdf
DOI  :  10.1088/1757-899X/403/1/012015

来源: IOP

【 摘 要 】

The river has a dynamic nature that subject to change in the dimensions of space and time of. At the time of the balanced condition, the flow would be troubled by a pillars of the bridge and will form a more balanced condition caused scours the base. Scour around bridge pillars caused by the vortex system. This research will study the local scour depth at piers with two types of models (pillar 2 and pillar 3). Scour depth around pillars were observed for 15 minutes, 30 minutes and 50 minutes is done on a set of recirculating sediment on land lines with a length of 20 meters, width of 0.5 meters and height of 0.20 meters with a permanent uniform flow conditions. The model used is the type pillar with a hexagonal cross-section dimensions of 10 cm long, 5 cm width and 3.5 cm sloping sides. Scour depth measured each consisting of running time variation. The flow velocity was measured at each pillar around which causes the variation of maximum scour occurs.