殘骸與沖刷深度對樁基礎橋梁之影響

EFFECTS OF DEBRIS AND SCOUR DEPTH ON PILE FOUNDATION BRIDGE

阮向陽(Huong-Duong Nguyen)

指導教授 ： 張國鎮

國立臺灣大學/工學院/土木工程學研究所/碩士(2010年)

https://doi.org/10.6342/NTU.2010.00732

摘要

無資料

關鍵字

莫拉克颱風 ； 雙園大橋 ； 基樁破壞 ； 沖刷 ； 岩屑 ； 水載重 ； 側推

並列摘要

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.

並列關鍵字

Morakot typhoon ； Shuang Yuan bridge ； pile failure ； scoured ； debris ； water load ； pushover

參考文獻

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