Analysis of tall building for across wind response

Abstract

Tall buildings are slender flexible structures and need to be investigated to ascertain the importance of wind induced oscillations or excitation along and across the direction of wind. The Indian code of practice for wind load on buildings and structures (IS-875 Part-3 1987) gives a procedure to determine along wind response of tall structures, while the across wind response and interference effect are not included in the code at present. A document ‘Review of Indian Wind Code IS 875 (Part 3) 1987’ has been prepared by IIT Kanpur under GSDMA project gives recommendations to obtain across wind response of tall buildings as per procedure given in Australian/New Zealand standard ‘Structural Design Actions – Part 2 Wind Action (AS/NZS 1170-2: 2002) In the Australian code to obtain the cross wind response it is necessary to compute the coefficient (Cfs) for which figures and expressions are given for selected (h:b:d) ratios. In this paper use of Artificial Neural Network (ANN) has been made to generalize the above procedure from the limited available data, so that across wind response can be obtained for a building with given (h:b:d) ratio.