Buckling Response Analysis of Concrete Circular Domes
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Date
2023-03
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Addis Ababa University
Abstract
Concrete circular dome roofs are widely used on large-diameter churches, mosques, houses, schools, storage and business facilities, industrial and commercial buildings, football-filled roofs and basketball stadiums, and so on, as they provide high strength for very limited amounts of material: buckling normally controls the design. The purpose of this study is to investigate the linear buckling behavior of a circular concrete shell with a constant span of 40m. To do so, the linear buckling response of a concrete circular dome under dead load, live load, seismic action, and combinations of these, the linear buckling response of a concrete spherical dome with pinned and fixed support conditions when subjected to the horizontal component of earthquake load, the linear buckling response of a concrete circular dome with variable thickness and rise are investigated. For analysis, analytical and SAP2000 version-21 finite element software is used. In this scenario, five distinct radius-to-thickness ratios are used to determine the linear buckling responses of a circular concrete shell under the action of dead load and the horizontal component of seismic action, and the effect of different dome support conditions is considered. The buckling behaviour of the circular shell roof changes as the radius-to-thickness ratio and span-to-raise ratio change. The numerical value of buckling pressure decreases as the radius-to-thickness ratios and span-to-thickness ratios increase, and vice versa. Different dome structures with different geometry designations are used to make results more reliable. Software results are almost the same as empirical results. Hence, the findings are reliable and valid.
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Keywords
Circular concrete shell roof, buckling pressure, Span rise ratio, radius to thickness ratio, buckling load factor, boundary condition