Institutional Repository
Technical University of Crete
EN  |  EL



My Space

Οptimization of dynamic response of liquefied natural gas tanks

Spachis Andreas

Full record

Year 2019
Type of Item Master Thesis
Bibliographic Citation Andreas Spachis, "Οptimization of dynamic response of liquefied natural gas tanks", Master Thesis, School of Environmental Engineering, Technical University of Crete, Chania, Greece, 2019
Appears in Collections


This post‐graduate diploma thesis focuses on the optimization of the dynamicresponse of liquefied natural gas (LNG) tanks. The study investigates the seismicresponse of particular types of LNG tanks, using advanced computational methods.Specifically, the possibility of improving the dynamic response of the tanks, usingeffective seismic isolation systems at the foundation level, constitutes one of themost important aspects of this study.The aforementioned goals are achieved through the application of finiteelement software for the analysis of the complex dynamic interaction (tank‐liquid‐interaction). Furthermore, an efficient methodology for improving the seismicresponse of tanks through optimization of critical design parameters of the isolators has been developed. This has been achieved by developing a code that is applicable to real data and is able to lead to the implementation of optimal seismic protection measures, more efficient techno‐economic design so that to reduce the probability of failure of the superstructure. Specifically, codes were developed using MATLAB so as to implement optimization methodology using Cuckoo Search algorithm, while the results were used as input data in the finite element software in order to carry out the parametric study of the dynamic response of the tanks.The outline of the study is briefly described: Firstly, the seismic design of LNGtanks is described. Subsequently, the theoretical background which has beenimplemented for the simulation of the dynamic response of isolated tanks ispresented. Then, the optimization formulation is configured, which includes thedesign variables as well as objective and constraints functions. In addition, theoptimization algorithm and the developed MATLAB codes are presented. Then, theexamined tanks are simulated and analyzed using finite element software SAP2000.Finally, a detailed parametric analysis is conducted, the numerical results arepresented and compared to results derived from relevant studies, and theconclusions drawn are provided.

Available Files