Proposed Revision of ACI 505-54: Specification for the Design and Construction of Reinforced Concrete Chimneys

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Title: Proposed Revision of ACI 505-54: Specification for the Design and Construction of Reinforced Concrete Chimneys

Author(s): ACI Committee 307

Publication: Journal Proceedings

Volume: 65

Issue: 9

Appears on pages(s): 689-712

Keywords: chimneys;compressive strength;concrete construction;dead loads;earthquake resistant construction;formwork (construction);foundations;high temperature; linings;loads (forces);moments;openings;quality control;reinforced concrete; reinforcing steel;stresses.

Date: 9/1/1968

Abstract:
This report gives material, construction, and design requirements for reinforced concrete chimneys. The report sets forth recommended loadings for the design of reinforced concrete chimneys and recommended methods for determining the stresses in the concrete and reinforcement resulting from these loadings. Charts containing curves to aid in the rapid solution of the specified formulas are included. While the method of analysis applies primarily 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 inside 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 and wind (or earthquake) loads with the stresses due to temperature are included in the specification, together with recommended allowable stresses in the concrete and reinforcement for the various stress combinations. The specification refers to the ACI "Building Code Requirements for Reinforced Concrete" (ACI 318) for applicable requirements with supplemental provisions to take care of the special requirements for concrete chimneys. Appendices 1 and 2 review current (1968) practices for linings for concrete chimneys, for lightning protection, obstruction lighting, access ladders, and other chimney accessories.