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Kumar, B. Dean
- Wind Effects on Tall Building Frames-influence of Dynamic Parameters
Abstract Views :636 |
PDF Views:410
Authors
Affiliations
1 Department of Civil Engineering, JNTU College of Engineering, Hyderabad-500085, IN
2 Department of Civil Engineering, Vasavi College of Engineering, Ibrahim Bagh-500031, IN
1 Department of Civil Engineering, JNTU College of Engineering, Hyderabad-500085, IN
2 Department of Civil Engineering, Vasavi College of Engineering, Ibrahim Bagh-500031, IN
Source
Indian Journal of Science and Technology, Vol 3, No 5 (2010), Pagination: 583-587Abstract
In the recent past many tall buildings and high rise towers are being built in India. The impact of wind loads are to be considered for the design of these towers on par with steel towers like transmission towers, microwave towers, cooling towers and very tall multistoried building towers. Several failures of structures have occurred in India due to wind. The IS 875 Part-3 deals with wind loads on different types of structures. In the present work, the Gust Effectiveness Factor Method is used, which is more realistic particularly for computing the wind loads on flexible tall slender structures and tall building towers. In this paper frames of different heights are anlaysed and studiedKeywords
Wind Loads, Dynamics, Wind Velocity, Gust Pressures, Mean Hourly WindReferences
- Davenport AG (1967) Gust loading factors. Struct. Div. ASCE. Proc. Paper 5255, 93, 11-34.
- Davenport AG(1982) The interaction of wind and structure. Engg. Metoro. 269, 527-572.
- IS-875 (1987) Code of practice for design loads for building and structures. Part-3 wind loads. Published by Bureau of Indian Standards.
- Swami BLP (1987) Study of wind speeds in India and their effects on typical structures. Ph.D. Thesis submitted to the I.I.T., Delhi.
- Swami BLP, Dean Kumar B and Narasimha Rao J (2009) Critical gust effects on tall building frames-influence of various dynamic parameters. ICAMB. 3, 2044-2052.
- Xinzhong Chen (2008) Analysis of along-wind tall building response to transient nonstationary winds. ASCE. 134 (5), 782-791.
- Wind Effects on Water Towers-influence of Various Dynamic Parameters
Abstract Views :395 |
PDF Views:144
Authors
Affiliations
1 Dept. of Civil Engineering, JNTUH, College of Engineering, Kukatpally, Hyderabad-500085, AP, IN
2 Dept. of Civil Engineering, Vasavi College of Engineering, Ibrahimbagh, Hyderabad, 500031 AP, IN
1 Dept. of Civil Engineering, JNTUH, College of Engineering, Kukatpally, Hyderabad-500085, AP, IN
2 Dept. of Civil Engineering, Vasavi College of Engineering, Ibrahimbagh, Hyderabad, 500031 AP, IN
Source
Indian Journal of Science and Technology, Vol 3, No 8 (2010), Pagination: 911-915Abstract
Wind flows relative to the surface of ground and produces loads on the structures standing on the ground. The effect of the wind on the structures is of prime importance. Most of the designers consider the static effect of wind on the structure. But for tall structures the wind interacts with the structure dynamically. The Indian standard code IS 875 (Part-3) 1987 deals with the wind effects on the structures. Water towers are critical structures from the point of the wind effect. Towers of height 16 m, 20 m, 24 m and 28 m are considered in the present analysis. Fundamental frequency is computed by the method given in Indian standard IS 1893-1984. In the computation of fundamental frequency two conditions a) Tank empty and b) Tank full with water are considered. It is found from the study that static pressures are less compared to those given by the gust effectiveness factor method (GEFM). Dynamic interaction between the fluctuating wind component and the structure are considered in GEFM and equivalent static wind pressures are evolved. GEFM is more rational and realistic and recommended for wind load design of water towers.Keywords
Gust Pressure, Fundamental Frequency, Static Pressure, Background Factor, ResonanceReferences
- Davenport AG (1961) The application of statistical concepts to the wind loading of structures. Proc. Inst. Civ. Engg. 19, 449-472.
- Dean Kumar B and Swami BLP (2010) Wind effects on tall building frames–Influence of dynamic parameters. Indian J. Sci. Technol. 3(5), 583-587.
- Irwin P, Kilpatrick J and Frisque A (2008) Friend or foe, wind at height. CTBUH 8th world congress.
- IS-875 Part 3- (1987) Code of practice for design loads (other than earthquake) for buildings and structures. Bureau of Indian standards.
- Scruton CS (1963) Note on a device for the suppression of the vortex-excited oscillations of flexible structures of circular or near circular section with special reference to its application to tall stacks. NPL aero report no.10. National Physical Laboratory, Teddington, UK.
- Scruton CS (1966) Effects of wind on stacks, towers and masts with special reference to the wind excited Oscillations. Proc. of the symp. on tower shaped structures. Int. Assoc. of shell structures. Bratislava. June.
- Vickery BJ (1970) On the reliability of gust loading factors. Proc. of the technical meeting concerning wind loads on buildings and structures. National bureau of standards, buildings science series. 30, Washington, DC, pp:93-104.