Chimney Design for Two Layers of Reinforcement and Concentrated Corbel Moments


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Title: Chimney Design for Two Layers of Reinforcement and Concentrated Corbel Moments

Author(s): Marius Diver and Robert W. Pierce

Publication: Journal Proceedings

Volume: 70

Issue: 10

Appears on pages(s): 701-708

Keywords: bending moments: chimneys: compressive strength; loads (forces): modulus of elasticity: reinforced concrete: reinforcing steels; specifications: structural analysis; structural design; temperature: tensile stress: wind pressure.

Date: 10/1/1973

ACI 307-69 is a most valuable document, but it is lacking in two important aspects of modern design of large chimneys. These limitations are that it treats only the case of a single layer of reinforcing, and that it provides no means of incorporating the effects of locally concentrated corbel moments into a general design. This paper expands the standard to incorporate two layers of reinforcing, and introduces an extra loading case, resulting from corbel moments. Final expressions are given in a form comparable to that in ACI 307-69, and these are expressed graphically where it is valuable to do so. A flow chart and a fully worked example are also presented to illustrate utilization of the method proposed. This method differs from that used in ACI 307-69 primarily in that a clear distinction is made between various states of stress of a design section, to facilitate a simple superposition of loading cases under commonly encountered design situations.