Load-moment interaction envelopes for design of tall stacks - A limit state approach

Abstract

Chimneys act as an indirect and effective means of air pollution control and have been popular from time immemorial. Environmental protection agencies have been forced to frame, implement and monitor stringent pollution control policies. With control regulations becoming more stringent, chimneys of heights over 400 m are being erected and used. Design of reinforced concrete tall stacks for load and wind induced moments by trial and error technique involves rigorous computational efforts. Availability of interaction envelopes help reduce computational time. This paper presents such design aids for tall stacks.