Proposed Standard Specification for the Design and Construction of Reinforced Concrete Chimneys

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Title: Proposed Standard Specification for the Design and Construction of Reinforced Concrete Chimneys

Author(s): ACI Committee 505

Publication: Journal Proceedings

Volume: 49

Issue: 1

Appears on pages(s): 353-400

Keywords: no keywords

Date: 1/1/1953

Abstract:
This revised specification sets forth recommended loadings, including pro-vision for both wind and earthquake, for the design of reinforced concrete chimneys and recommended methods for determining the stresses in the con-crete and reinforcement resulting from these loadings. The method of analysis includes determination of the stresses at, horizontal cross sections where flue or other openings occur as well as at sections where the cross section is an annular ring. Charts containing curves to aid in the rapid solution of the specified formulas are included. While the method of analysis applies prima-rily to chimneys, it can be used for other hollow circular cross sections, with or without openings, where the shell thickness is small in proportion to the diameter. Formulas are recommended for determining the temperature gradient through the concrete resulting from the difference in temperature of the gases imiide the chimney and the surrounding atmosphere, together with methods for determining the stresses in the concrete and reinforcement both vertically and circumferentially due to the temperature gradient through the concrete. Formulas for combining the stresses due to dead, wind, and earthquake loads with the stresses due to temperature are included in the specification, together with recommended allowable stresses in the concrete and reinforce-ment for the various stress combinations. The specification covers the mixing and placing of the concrete by reference to the ACI "Building Code Requirements for Reinforced Concrete" (ACI 318) with supplemental provisions to take care of the special requirements for concrete chimneys. The specification also includes recommended practice for linings for concrete chimneys, where required, for lightning protection, access ladders, and ether chimney accessories. In an appendix many of the equations used are derived and the assumptions on which they are based are given.