Abstract
The seismic performance verification of a pile supported wharf for Level-2 earthquake ground motion has been carried out using effective stress analysis code FLIP. If the performance requirements are not satisfied because of full plasticity of piles, trial and error is required, such as to increase the thickness of steel pipe piles. Steel pipe piles, tensile strength of which is 400 N/mm2 grade or 490 N/mm2 grade, have been generally used in port structures. However, if it is possible to use a high strength steel pipe pile (more than 490N/mm2 grade), port structures can be constructed at low cost.
Aiming to apply the high strength steel pipe pile manufactured from hot coil (570N/mm2 grade) to port structures, experiments as follows have been conducted. 1) Cyclic loading test of the single steel pipe pile. 2) Cyclic loading tests of the coupled steel pipe piles (pile supported wharf models). 3) Immersion tests for verification of corrosion characteristics. Consequently, it has been found that the high strength steel pipe pile (570N/mm2 grade) can be used in the same way as conventional strength pipe piles. Design method has been also proposed.
