| Abstract [eng] |
Stability of a variable cross section steel frame of a storage facility, located in port area, is being analyzed in this Master's thesis. In the first part of the thesis, a review of literature sources has been done, concept of stability explained and developed, classical analytical methods of solving stability problem, as well as new methods have been analyzed and reviewed. Also the finite element method has been analyzed, including the usage of the FEM for solving stability, and history of the FEM. Scientific literature was also reviewed and newly proposed methods described. The investigational part of the thesis is divided into two parts: primary and final investigations. An unique structure analysis algorithm has been designed, and analyzes carried out based on it. Objective of the primary analysis is to compare the analytical and numerical methods for analyzing stability, review the requirements of the Lithuanian and international design norms, and tie analytical and numerical methods using a new safety factor. In the final investigation part of the thesis, a steel frame is designed and modeled in one and two dimensional finite elements, it's global and local stability analyzed, and, using a newly introduced safety factor, and after a number of improvements of the frame structure, a final frame, satisfying Lithuanian design norm requirements, is designed. The frame is adjusted to be safe to use in coastal region, as loads, specific for the region, are applied. Finally, a whole frame is modeled in FEM, global stability of the frame is checked, and results compared. |
