ULTIMATE CAPACITY OF FIXED OFFSHORE PLATFORMS BY STATIC AND DYNAMIC PUSHOVER ANALYSES UNDER ENVIRONMENTAL LOADS

Quasi static push-over analysis is widely utilized to evaluate nonlinear behavior and ultimate capacity of offshore platforms against environmental wave loading. In reality the forces imparted by the waves traversing the structure, are dynamic loads. If these lateral dynamic loads are to be used in push over analysis, they can provide a more precise estimation of the maximum load that can be resisted by the structure compared to the value derived using quasi static approach. Other parameters that have effect on determination of the ultimate capacity of platforms are the platform structural configuration and its supporting conditions. In this paper, a comprehensive technique within a dynamic push-over analysis for jacket offshore platforms is provided. In the analyses performed herein, the ultimate capacity of a sample platform with two bracing configuration, and with different supporting conditions has been evaluated by using static and dynamic push-over analysis.