Nonlinear Dynamic and Probabilistic Risk Analysis of Titanium Marine Riser

Volume 9 Issue 1 December - February 2019

Research Paper

Nonlinear Dynamic and Probabilistic Risk Analysis of Titanium Marine Riser

Rizwan Ahmad Khan *, Atul Singla**, Atul Goyal ***

* Associate Professor, Department of Civil Engineering, Z. H College of Engineering and Technology, A.M.U, Aligarh, India.

**,*** Graduate, Department of Civil Engineering, National Institute of Technology, Jalandhar, Punjab, India.

Khan, R. A., Singla, A., & Goyal, A (2019). Nonlinear Dynamic and Probabilistic Risk Analysis of Titanium Marine Riser. i-manager’s Journal on Civil Engineering, 9(1), 33-46. https://doi.org/10.26634/jce.9.1.14575

Abstract

Titanium has numerous good properties such as high strength, high corrosion resistance and it has low density allowing weight savings thus making it attractive for using in construction of Marine Risers[8]. This paper presents the dynamic and probabilistic analysis of Titanium Riser under the loadings caused by random sea waves of different heights. The dynamic analysis of riser is done by finite element analysis method using ABAQUS/AQUA. Using the Fracture Mechanics model and stress vs number of cycles (S-N) model various sea states were investigated and reliability of Titanium Riser under deep sea has been estimated. The approach based on reliability considers various uncertainties which helps to make effective designs of risers. Results are presented which shows variation of bending stress of riser with the variation in depth of riser. The stress-time history and PSD (Power Spectral Density) curves shows the effect of nonlinearities on bending stress. The variation of reliability index due to various uncertainties are also presented.