Publication Abstract

Proceedings - Seventh International Conference & Exhibition on Piling and Deep Foundations, 1998, Vienna, Austria, (DFI)

Offshore and Onshore Loading Tests for the Ford Island Bridge, Hawaii
Gerald Y. Seki, Clayton S. Mimura, Trevor D. Smith

The Ford Island Bridge is presently under construction across Pearl Harbor, Hawaii, and is supported by 492 octagonal precast prestressed driven concrete piles up to 43m (141 feet) long. Geotechnical conditions from the mudline in 12m (40 feet) of water typically comprise of 10 to 12m of soft sediment overlying stiff overconsolidated alluvial silt. The stiff alluvium provides most of the design axial compression and tension capacities, which were proofed by both static and dynamic PDA load testing. Prebored pressuremeter tests were used to supplement the UU triaxial laboratory data, 5 static loading tests, and the performance of 31 indicator piles, to establish the design adhesion for final penetration depths. Pile setup on restrike was shown to be from 2 to 4 times initial capacity but no clear relationship between capacity and time, or hammer blows could be identified. CAPWAP restrike analyses were used for adhesion in the soft sediments and results form static loading tests used to determine adhesion in the stiff silts.

 article #371; publication #34 (IC-1998)