Published Paper Details:

In the past, it was considered sufficient to use the mean wind speed that had been recorded at the nearest meteorological station. The corresponding wind pressure is applied statically. However, wind loading varies with time. In addition to the steady wind, there are effects of gusts that may last for a few minutes. Gust causes an increase in air pressure and may affect part of the building. All the structures experience dynamic oscillations due to the fluctuating component (gustiness) of wind. In short rigid structures these oscillations are insignificant, and therefore can be satisfactorily treated as having an equivalent static pressure. This is the approach taken by most Codes and Standards. The present Indian Standard for wind loads IS 875 (Part 3) 2015 is also based on the Static method. However, the Gust factor method is also included for computing the dynamic effects of wind on flexible structures that can oscillate in the wind. Very few research papers are available in relevance to this effect. Therefore, In this paper, a comparative analysis of tall buildings subjected to wind loads computed by using static method i.e Force coefficient method & dynamic method i.e Gust factor method as per IS 875 (part-3) 2015 is carried out for various H x B x D ratios of building. In this paper, the effect on buildings with change in terrain category considering category 2 & 4 is also determined using the parameters like Base shear, Overturning moment, Maximum story displacement & Maximum story drift, and the best suitable approach corresponding to the terrain category is suggested. MS-Excel has been used for calculating the along with the wind and across wind loads at various heights of buildings & for frame modeling and analysis ETABS software is used. It has been found in an analysis that terrain category plays an important role in considering the suitability of the two approaches. It is found that in terrain category 4 static approach is governing whereas in terrain category 2 dynamic approach is showing critical effects on buildings for all H x B x D ratios.