Nonlinear Seismic Response of Articulated Offshore Tower

Defence Science Journal

Nazrul Islam²  Suhail Ahrnad¹ 

[1] Indian Institute of Technology Delhi, New DeIhi;Jamia Millia Islamia, New Delhi

关键词: Articulated offshore tower;    earthquake loading;    seismic response;    random vibration;    base shear;    drag;    nonlinear dynamics;    equation of motion;   

DOI  :  

学科分类：社会科学、人文和艺术（综合）

来源: Defence Scientific Information & Documentation Centre

【 摘 要 】

The seismic response of articulated offshore tower has been investigated by the spectral analysis method which is based on the principle of random vibration, where seismic excitation is assumed to be a broadband stationary process. The nonlinear dynamic eqliation of motion is derived using Lagrangian approgch and the solution is obtained by Newmark's P integration scheme. The present study includes nonlinearities associated due to variable submergence, drag force, Coulomb damping, variable buoyancy, and added m sal ong with the geonmrical nonlinearities of the system. The study includes the joint occurrence of waves and seismic fofces together with the current under random sea state. A parametric study has been conducted to investigate the relative importance of the seismic response in comparison to the response due to wave forces.

【 授权许可】

Unknown