INCORPORATION OF AGING EFFECTS OF PILES INTO THE STRUCTURAL RELIABILITY ANALYSIS OF OFFSHORE JACKET PLATFORMS

The structural reliability assessment of offshore jacket platforms using non-linear
pushover analysis in the past had shown that most ofthe platform failures occur due to
the lack of strength in the pile foundation. When the failures of jacket platforms in
extreme weather conditions were studied, it was observed that the foundation was intact
while the platform failed. This disagreement between the simulation and the actual
condition can be explained by the phenomenon ofAging of pile foundations. The axial
aging ofpiles have been experimentally proved by earlier researchers and mathematical
equations relating pile capacity and time after pile installation were formulated. One
of such functions, namely Skov and Denver equation was utilised to study the borehole
soil data from ten offshore Malaysian locations. The AAU method was employed
alongside with this to find out the average setup factor for Mixed and Clayey soils in
offshore Malaysia.