Abstract
This research identifies the significant optimal intensity measures (IM) for seismic performance assessments of the fixed offshore jacket platforms. A four-legged jacket platform for the oil and gas operation is deployed to investigate the seismic performance. The jacket platform is applied with nonlinearly modeled using finite element (FE) software OpenSees. A total of 80 ground motions and 21 different IMs are incorporated for numerical analyses. Nonlinear time-history analyses are performed to obtain the jacket structure’s engineering demand parameters (EDP): peak acceleration and displacement at the top of the structure. Four important statistical parameters: practicality, efficiency, proficiency, and coefficient of determination, are then calculated to find the significant IMs for seismic performance of the jacket structure. The results show that acceleration-related IMs: effective design acceleration (EDA), A95 parameter, and peak ground acceleration (PGA) are optimal IMs, and the acceleration-related IMs have good agreements with the acceleration-related EDP.
Highlights
Jacket structures are commonly employed for several purposes in the offshore industries, especially in petroleum exploration, offshore wind turbines support structures, etc
It is essential to identify the optimal intensity measure (IM) that adequately correlates with the structural response to establish a perfect relationship between structural response and IM [9]
Babaei et al [26,27] tried to find the best pair of IM-engineering demand parameters (EDP) for jacket structures
Summary
Jacket structures are commonly employed for several purposes in the offshore industries, especially in petroleum exploration, offshore wind turbines support structures, etc. The considered damping ratio is five percent of critical damping, which is not established yet for offshore jacket structures. This demonstrates the need to investigate and identify IMs that are not related with the damping ratio. They did not consider any specific target spectrum to ground motions that is necessary for seismic assessment for certain sites. The studies on the ground motion’s intensity and its influence remains underrated and needs more investigation This illustrates the importance to consider more IM parameters for site-specific for better accuracy in seismic assessments
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