Snap Through of a Shallow Spherical Dome of a Prestressed Concrete Tank
Publication: Practice Periodical on Structural Design and Construction
Volume 14, Issue 4
Abstract
An investigation of the stability of the roof of an 85-ft diameter cylindrical prestressed concrete wastewater treatment tank is presented. The roof of the tank is a very thick, shallow spherical dome. With a 1/16 rise to span ratio, 2 ft thickness, and an 18 ft diameter central opening at its pole, the dome falls outside the range of parameters for which the thickness design equation for domes in the ACI 350 code applies. The shallowness parameter of the dome is in the range where axisymmetric snap-through buckling can be expected. A finite-element model was used to compute the nonlinear axisymmetric deflection of the dome up to its limit point, the snap-through to its inverted configuration, and the post snap-through load deflection. Bifurcation from the symmetric deformation to a nonsymmetric buckling mode below the limit point was investigated with a different finite-element model than was used for the evaluation of the snap-through. The finite-element results are compared to a form of the design equation for dome thickness in ACI 350. The dome thickness equation in ACI 350 was used to calculate dome load capacity, given the thickness, and was found to be significantly higher than the capacity computed with the finite-element model.
Get full access to this article
View all available purchase options and get full access to this article.
References
ACI Committee 350. (2006). “Code requirements for environmental engineering concrete structures and commentary.” ACI 350-06, American Concrete Institute, Farmington Hills, Mich.
ACI Committee 372. (2003). “Design and construction of circular wire- and strand-wrapped prestressed concrete structures.” ACI 372R-03, American Concrete Institute, Farmington Hills, Mich.
AWWA Standard D110. (2005). “Standard for wire- and strand-would, circular, prestressed concrete water tanks.” ANSI/AWWA D110-04, American Water Works Association, Denver, Colo.
Handbook of structural stability. (1971). Column Research Committee of Japan, Corona, Tokyo, 4–278.
Heger, F. J. (1990). “Concrete domes for water and wastewater tanks.” ACI Struct. J., 87(4), 445–452.
Zarghamee, M. S., and Heger, F. J. (1983). “Buckling of thin concrete domes.” ACI J., 80(6), 487–500.
Information & Authors
Information
Published In
Copyright
© 2009 ASCE.
History
Received: Oct 22, 2008
Accepted: Jan 11, 2009
Published online: Mar 24, 2009
Published in print: Nov 2009
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.