Application of Genetic Programming for Determination of Wind Loads on Tall Buildings

Abstract

Tall building can vibrate in both the directions of Along wind and Across wind caused by the flow of wind. Modern Tall buildings designed to satisfy lateral drift requirements, still may oscillate excessively during wind storm. These oscillations can cause some threats to the tall building as buildings with more and more height becomes more vulnerable to oscillate at high speed winds. Sometimes these oscillations may even cause discomfort to the occupants even if it is not in a threatening position for the structural damage. So an accurate assessment of building motion is an essential prerequisite for serviceability. The wind response on tall buildings is generally estimated either through wind tunnel testing or using analytical approach as mentioned in IS8751987, Part-3. However, both these methods are very cumbersome and time consuming. Therefore, in this paper an attempt has been made to estimate the wind response on tall buildings using Genetic Programming in the along wind direction for Long After Body and Short After Body. The database has been developed using the analytical approach as given in IS875-1987, Part-3. The building height, plan dimensions, design wind speed, gust factor and base moment have been used as the parameters for the development of the equations. The Gust Factor and Base Moment thus obtained from Genetic Programming have been thus compared with the analytical values.