EFFECTS OF DEBRIS AND SCOUR DEPTH ON PILE FOUNDATION BRIDGE
Date Issued
2010
Date
2010
Author(s)
Nguyen, Huong-Duong
Abstract
Typhoon Morakot (or typhoon No 8) of August 8, 2009, destroyed a total of 90 bridges around Taiwan.
Water levels have traditionally been the sole criteria for bridge closure amid flooding in Taiwan., Under current guidelines, many bridges were not closed off before they collapsed this time. Take, for instance, the 2,083-meter Shuang Yuan Bridge, which was actually two separate bridges, one for each direction long of traffic. This bridge is expected in good conditions when the northbound bridge''s No. 2-15 piers and the southbound bridge''s No. 2-16 piers were washed away by raging currents.
In current time, the velocity of water flow, the geological condition of each bridge needs to be considered. In this study, the capacity of Shuang Yuan Bridge was investigated under different levels of scoured depth. The pile axial capacity based on soil parameters, the bending, shear capacity and buckling instability of piles was analyzed. Scoured group pile foundations were modeled by Sap 2000. Debris load was also computed based on various water velocities, debris geometry and hydraulic parameters assumption. The pushover analysis is carried out with water and debris load to find the capacity curve of the bridge with different scoured depth, then the maximum applied floodwater force acting on a pier, and the performance water velocity is determined. The possible causes of Shuang Yuan Bridge failure are also pointed out.
Subjects
Morakot typhoon
Shuang Yuan bridge
pile failure
scoured
debris
water load
pushover
Type
thesis
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