Metocean pushover analysis of a jacket-type offshore platform with different bracing systems

Erez, Erdem
Süreli Yayın başlığı
Süreli Yayın ISSN
Cilt Başlığı
Institute of Science and Technology
Today, as the human population increases, the need for energy increases accordingly. However, energy sources are limited. A result of this, people have started to get energy from different places. Oil and gas platforms are now installed in offshores around the world in order to exploit gas and oil from the under seafloor. These offshore platforms have hundreds of meter length and large structural members on the sea. Since offshore platforms are located on the water, many engineering problems occurs at the design process. In the design of offshore structures unlike onshore structures, extreme storm conditions are generally major considerations. Offshore structures can be categorized in three main types. These are fixed offshore platforms, floating platforms and gravity structures. In this study, a jacket-type fixed offshore platform which has form of steel frames includes tubular legs, braces and beams is examined subjected to extreme storm conditions. In this study, nonlinear metocean pushover analysis is performed with using a jacket-type offshore platform with different bracing configurations (diagonal, x-bracing, v bracing, inverted v-bracing and k-bracing) by using finite element software SAP2000. Therefore, five different structural models are used and the selection of the same type and size of columns, beams and diagonals are considered in order to take the equivalent qualities in the comparison of different bracing systems. The main aim of this study is to investigate and to compare the performances of different bracing systems for a jacket-type offshore platform subjected to 100-year extreme metocean conditions with different direction. The behavior of the platform with different bracing systems is examined under metocean pushover analysis. For all storm cases and all systems, ultimate platform resistances and reserve strength ratios are determined. Due to insufficient national specifications and guidelines, international guidelines are used in this study.
Thesis (M.Sc.) -- İstanbul Technical University, Institute of Science and Technology, 2020
Tez (Yüksek Lisans) -- İstanbul Teknik Üniversitesi, Fen Bilimleri Enstitüsü, 2020
Anahtar kelimeler
Civil engineering, İnşaat mühendisliği