Retrofitting Design and Physical Modeling for Pier-Scour Protection

摘要

The bridge piers of the old Gupo Bridge collapsed during Typhoon Maemi,in 2003. Due to the highway construction for the Dadae Harbor in the leftbank sideof the Gupo and Subway Bridges, the rightbank floodplain should be excavated toensure the flow full channel area. Bridge piers affected by the excavation are Pier 11and 12 of the Subway Bridge and Pier 15 and 16 of the Gupo Bridge. The proposeddesign for the Gupo and Subway Bridge piers is using the sheet pile and riprap toprotect the piers. The sheet piles around each pier can be either square or rectangular.Detailed design calculations for the proposed design such as scour depth and scourholewidth around bridge piers, and riprap and filter protections are conducted. Also,the experimental physical modeling is carried out to compare with scour calculationresults and to validate the stability of the proposed countermeasure.