B. Dean Kumar ¹, B. L. P. Swami ²

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

Abstract

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 studied

Keywords

Wind Loads, Dynamics, Wind Velocity, Gust Pressures, Mean Hourly Wind

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B. Dean Kumar ¹, B. L. P. Swami ²

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

Abstract

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, Resonance

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