Abstract
There are plenty of uncertainties in environmental condition of ocean and also in platform element capacities. Reliability-based method could consider these uncertainties. A reliability-based earthquake design method was used to determine the earthquake LRFD parameters for two conventional, steel, pile-supported (template-type) offshore platforms located in the Persian Gulf. The pile-soil-structure interaction, the buckling and postbuckling behavior of the braces were considered. Two steel platforms were simulated accurately by the finite element program Opensees. Field data were assumed based on past studies. Sensitiveness of reliability-based method was studied. It was found that the geometry of jacket and different types of braces was important in the capacity and the behavior of offshore platforms. Finally the calculated LRFD elements resistance factors for these two platforms were compared with API recommended factors and it was observed that API recommended element resistance factors were more appropriate for SSL 3.
Highlights
More than 100 pile-supported steel platforms have been constructed in the high-activity seismic regions all over the world and some others are in design and construction levels
The procedure used in this study for Reliabilitybased earthquake design is based on the API LRFD
Static pushover analysis of the SP1 and the SP2 specimens in X and Y directions, as outlined in Fig. 2 and 3, were shown in Fig. 6, 7, 8 and 9
Summary
More than 100 pile-supported (template-type) steel platforms have been constructed in the high-activity seismic regions all over the world and some others are in design and construction levels. Bea[1] in a cooperation with API and ISO studied the seismic design procedure in various high-activity seismic regions such as offshore California, Alaska, New Zealand, Japan, Indonesia, Venezuela and the Caspian Sea and he presented a step-by-step method for reliability-based earthquake design of offshore platforms. Using this method, the reliabilitybased earthquake design could be performed in any region with any specific geotechnical and seismic properties. The element predicted buckling load and post buckling behavior of strut members accurately. It produced fairly accurate results for yield load and post yield behavior of portal members
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