Evaluation of Wind Induced Interference Effects on Shape Remodeled Tall Buildings

The present work focuses on the outcome of experimental investigation of wind-induced pressure on Square, Fish-plan shape-1, and Fish-plan shape-2 building models under various interference conditions. The tests are carried out in a boundary layer wind tunnel with a scale of 1:300 for 100 percent blockage between twin interfering models. The gap between the twin building models is set at 10% of the principal model's height. By proposing equations, an attempt is made to understand the distribution of the average pressure coefficient at each level along with the building height for all surfaces. The study concludes that − 1 > Pressure Interference Factor > 1 as experienced by Fish-shape models exhibits increased pressure and suction due to the presence of interfering building model which is unlike Square-plan shape model at present working condition. For complex plan-shaped structures at interference conditions, the study of only the Interference factor (IF) is misleading, and hence, the study of both IF and ID (Interference Difference) is suggested. In interference tests, the Fish-plan shape-1 model shows enhanced overturning moment (along-wind) performance for all interference conditions. For the Fish-plan shape-2 model, diminished overturning moment (along-wind) performance is determined for Back-to-Front and Front-to-Front interference conditions.