Session: 06-10-01 Offshore Industry: Structures and Design I

Paper Number: 122603

122603 - Comparison of Methods for Seismic Response Analysis of an Offshore Jacket Platform Located in Bohai Bay, China 

As designing offshore jacket platforms in seismically active regions, it is imperative to account for the seismic-induced loads on the structure. In this study, seismic structural analysis of an offshore jacket platform located in Bohai Bay, China is conducted using the response spectrum analysis (RSA) method and the time history analysis (THA) method. The water depth, soil characteristics, and seismic response spectrum refer to the actual data of a local area in Bohai Bay. The structural dynamic responses are compared and the suitability of the two methods in the seismic design of jacket platform is assessed. Furthermore, a sensitivity study is conducted to investigate the effects of the earthquake strengths, deck weights and pile diameters on the structural seismic responses using the two analysis methods. Typical results revealed that the RAS method is the preferred choice for seismic design when it comes to offshore jacket platforms situated in regions characterized by low seismic ground motions. Nonetheless, in regions with high seismic intensity level, a more precise method should be contemplated. In such scenarios, the THA method can be used for nonlinear dynamic response analysis accounting for the seismic-induced excitation loads. This approach has the potential to lead more efficient and cost-effective pile and platform designs.

Presenting Author: Mengning Wu CNOOC

Presenting Author Biography: Dr. Mengning Wu is a structural engineer working at Bohai Oil Field Research Institute, Tianjin Branch of CNOOC Ltd.

Authors:

Mengning Wu CNOOC
Guohua Dai CNOOC
Honglin Pang CNOOC
Jingjian Wu CNOOC
Xiangyun Li CNOOC
Peng Liang CNOOC