Wind Tunnel Investigations on Tall Rectangular Building Models
- Most of the national/international codes on wind loads provide mean drag coefficient values for tall rectangular buildings in the form of uniform pressure/force coefficients.
- The coefficients provided in IS 875 (Part 3) -1987 are mainly based on wind tunnel model studies under uniform smooth flows, whereas many of the current international standards consider the boundary layer flow effects on the local force coefficients for tall buildings.
- Further these codes do not explicitly address the effect of terrain condition and the effect of oblique angles of wind incidence on these coefficients.
- Hence, systematic investigations have been carried out on a set of tall rectangular building models under simulated open and sub-urban terrain conditions in the boundary layer wind tunnel.
Based on these investigations, design guidelines on force coefficients for rectangular buildings have been formulated and presented to BIS codal committee
