IS 6533 -1989 Code Book PDF free download
This Indian Standard (Part 2) (First Revision) was adopted by the Bureau of Indian Standards on 20 April 1989, after the draft finalized by the Structural Engineering Sectional Committee had been approved by the Civil Engineering Division Council. This standard was first published in 1971. On suggestions by practicing engineers and representatives of various organizations in the country, the Sectional Committee decided to bifurcate the standard in two parts, separating structural aspects from the mechanical aspects as follows:
Part 1 Mechanical aspects, and
Part 2 Structural aspects.
In this part (Part 2), the dynamic effects of wind have been included as a check for resonance oscillations. More accurate method of determining the natural frequency of oscillation has been included. Many of the commonly known formula and calculation steps for design have been deleted to make the code concise. Further, since the principal load on the chimney is wind load, no increase in permissible stress is envisaged in this code aligning with the present line of thinking for wind loads. Atmospheric pollution regulations necessitate adoption of tall chimneys which require strengthening against stresses caused by oscillation due to wind action. Alternative procedures (a) making an appropriate increase in the design wind loading, and (b) indicating the need of strengthening or incorporation of devices for suppressing con-Barman type oscillations are given in Annex A. Certain methods of strengthening, such as welding or bolting helical stakes to the top one-third height of the chimney and the installation of damping devices are recommended ( see A-2.2 ). Design and construction of chimneys have become specialized field with a lot of scope for research and modifications. It is, therefore, attempted in this standard to cover only the basic requirements. The designer should use his discretion in the use of research data available. In the preparation of this standard, considerable assistance has been derived from the following:
a) BS 4076 : 1978 Specification for steel chimneys, and
b) Storytelling Norma E Provincial (SNIP-II-VI-1974) USSR (Soviet Norms on Loads and Actions).
This edition 2.1 incorporates Amendment No. 1 (June 1998). Side bar indicates modification of the text as the result of incorporation of the amendment.
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