Wind‐Buckling Approach for RC Cooling Towers
Publication: Journal of Engineering Mechanics
Volume 109, Issue 3
Abstract
The equations of the bending and stability theories for the orthotropic shell are solved using the finite element method (FEM). A biaxial material law for concrete and a nearly bilinear stress‐strain diagram for reinforcing steel were considered. Taking a layered ring element the influence of bending moments together with the membrane forces can be followed under increasing load up to the failure of concrete or steel. At each level the buckling factor can be calculated considering the stress dependent orthotropic buckling stiffness. The method of calculation developed is applied to two large cooling tower shells, one under wind load according to German code DIN 1055 and the other one under unusually high wind pressures, as those considered in the U.S.A. According to the wall thickness taken the buckling load factor drops to half or less of the value obtained assuming a linear elastic behavior. This high reduction is mainly due to orthotropy and the descending tangent modulus near the ultimate load.
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Published In
Journal of Engineering Mechanics
Volume 109 • Issue 3 • August 1983
Pages: 836 - 848
Copyright
Copyright © 1983 ASCE.
History
Published online: Aug 1, 1983
Published in print: Aug 1983
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