A new bracing system for improvement of seismic performance of steel jacket type offshore platforms with float-over-deck

作     者：Behrouz Asgarian Hamed Rahman Shokrgozar 

作者机构：Department of Civil Engineering K. N. Toosi University of TechnologyNo. 1346 Valiasr Street Mirdamad Intersection 19967 P.O. Box. 15875-4416Tehran Iran 

出 版 物：《Petroleum Science》 (石油科学（英文版）)

年 卷 期：2013年第10卷第3期

页      面：373-384页

核心收录：

学科分类：081505[工学-港口、海岸及近海工程] 08[工学] 0815[工学-水利工程] 0824[工学-船舶与海洋工程] 0814[工学-土木工程] 082401[工学-船舶与海洋结构物设计制造] 

基　　金：sponsored by POGC (Pars Oil and Gas Company,No.132 "Investigation of Structural Health Monitoring of Steel Jacket Offshore Platforms") The financial support of POGC is gratefully acknowledged 

主　　题：Steel jacket type offshore platform float-over deck mean annual frequency force vibration test seismic performance dynamic characteristics 

摘      要：In this paper, the seismic response of a newly designed steel jacket offshore platform with a float over deck （FOD） system in the Persian Gulf was investigated through incremental dynamic analysis. Comparison of incremental dynamic analysis results for both directions of the platform shows that the lateral strength of the platform in the float over direction is less than its lateral strength in other direction. Dynamic characteristics measurement of a scale model of platform was also performed using forced vibration tests. From experimental measurement of the scaled model, it was observed that dynamic characteristic of the platform is different in the float over direction compared to the other direction. Therefore, a new offshore installed bracing system for the float over direction was proposed for improvement of seismic performance of this type of platform. Finally, the structure with the modified system was assessed using the probabilistic seismic assessment method as well as experimental measurement of its dynamic characteristics. It was observed that the proposed offshore installed bracing system improves the performance of platforms subjected to strong ground motion.