IS 4998 -1992 Code Book PDF free download

IS 4998 -1992 Code Book PDF free download


This Indian Standard Standards, after the ( Part 1 ) ( Second Revision ) was adopted by the Bureau of Indian draft finalized by the Special Structures Sectional Committee had been approved by the Civil Engineering Division Council. This standard was first published in 1968 as IS 4998 and subsequently revised in 1975 to cover the requirements of the structural design as well as assessment of loads for reinforced concrete chimneys. In this standard ( Part 1 ) assessment of loads on reinforced concrete chimneys has been covered. Part 2 of this standard will cover design criteria of reinforced concrete chimneys. The recommendations of these standards apply only to chimneys of circular cross-section. Chimneys of non-circular cross-section may experience higher direct wind loads and more complex dynamic effects such as galloping. In such cases, specialist advice shall be obtained for estimating wind loads. Design for dynamic effects of wind and seismic forces requires detailed investigation. When several chimneys are located close to each other, or when the chimney/chimneys are located close to other structures of comparable height, model tests in wind tunnels shall be carried out to assess the buffeting problems that may arise. The design provisions relating to seismic forces are covered in IS 1893 : 1984 ‘Criteria for earthquake resistant design of structures (fourth revision )‘. In the formulation of this standard the following publications have been consulted : AC 307-88 Standard practice for the design and construction of cast-in-place reinforced concrete chimneys. American Concrete Institute, Detroit, Mich. 48219, USA. AS 1170.2-1989 SAGA Loading code : Part 2 : Wind loads. Standards -Association of Australia. Model code for concrete chimneys, Part A : The shell ( October 1984 ) published by CINDY. Wind-induced loads on reinforced concrete chimneys by B.J. Trickery, National Seminar on Tall Reinforced Concrete Chimneys, April 1985, New Delhi. ESAU-70029, published by ESAU, London. Ramakrishna T.N., Rae G.N.V., Vascular S. and Eddy K.R. ‘Model observations of interference effects on oscillatory response of identical stacks’. Proc. 4th Int. Conf. on Wind Effects on Blags. and Ste. Heath row, pp. 209-214. 1975. Ra G.N.V., ‘Wind effects on tall chimneys’. Asia Pacific Symposium on Wind Engineering, December 1985, University of Doorkeeper, India. Rio G.N.V., Vascular S. and Eddy K.R. ‘Model studies on wind effects on tall reinforced concrete chimneys’. National Seminar on Tall Reinforced Concrete Chimneys, April 1985, New Delhi.



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