Buckling of cylindrical metal shells resting on discretely supported ring beams

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Tezin Türü: Yüksek Lisans

Tezin Yürütüldüğü Kurum: Orta Doğu Teknik Üniversitesi, Mühendislik Fakültesi, İnşaat Mühendisliği Bölümü, Türkiye

Tezin Onay Tarihi: 2013

Öğrenci: CEM SONAT

Danışman: CEM TOPKAYA

Özet:

Silos in the form of cylindrical metal shells can be supported by evenly spaced columns in applications where an access space is needed for discharge of contained solids. In large silos a ring beam is utilized to more evenly distribute the column forces into the shell. The presence of discrete supports results in a non-uniformity of meridional stresses around the circumference. The stress non-uniformity must be taken into account in assessing the stability of the shell. Design standards provide recommendations for buckling of shells under uniform compression while being silent for providing solutions for non-uniform stresses. Designers have to resort to onerous finite element analysis which includes geometric and material nonlinearities with imperfections (GMNIA). A parametric study has been undertaken to develop a family of resistance curves which can be directly used in design without the need for complicated analysis. The resistance curves depend on the plastic resistance and elastic buckling resistance. Simple algebraic equations were developed to represent the plastic and elastic buckling resistances which were obtained using material nonlinear analysis (MNA) and linear bifurcation analysis (LBA), respectively. The proposed methodology is based entirely on hand calculations except for finding the degree of non-uniformity in the meridional stresses, which can be determined using linear finite element analysis.