Wind interference effect on an octagonal plan shaped tall building due to square plan shaped tall buildings

Abstract

The variation of pressure at the faces of the octagonal plan shaped tall building due to interference of three square plan shaped tall building of same height is analysed by computational fluid dynamics module, namely ANSYS CFX for 0°wind incidence angle only. All the buildings are closely spaced (distance between two buildings varies from 0.4h to 2h, where h is the height of the building). Different cases depending upon the various positions of the square plan shaped buildings are analysed and compared with the octagonal plan shaped building in isolated condition. The comparison is presented in the form of interference factors (IF) and IF contours. Abnormal pressure distribution is observed in some cases. Shielding and channelling effect on the octagonal plan shaped building due to the presence of the interfering buildings are also noted. In the interfering condition the pressure distribution at the faces of the octagonal plan shaped building is not predictable. As the distance between the principal octagonal plan shaped building and the third square plan shaped interfering building increases the behaviour of faces becomes more systematic. The coefficient of pressure (C p ) for each face of the octagonal plan shaped building in each interfering case can be easily found if we multiply the IF with the C p in the isolated case.

Effects of roof slope and wind direction on wind pressure distribution on the roof of a square plan pyramidal low-rise building using CFD simulation

“…A significant change in pressure coefficients on the building was found due to variations in the distance of interfering walls; this may be explained by the fact that shielding occurs (John et al 2012). The coefficient of pressure in some specific interfering situation was found to be larger than that in isolated case which evidences that the presence of the interfering buildings does not always contribute to the reduction of wind load on the principal building (Kar and Dalui 2016).…”

“…However, in spite of its specific features, very limited research work has been carried out in this specific area of wind load on pyramidal roof buildings (Roy et al 2018b;Roy et al 2018a). Maximum studies in this field are concerned with low-rise buildings with canopy roof (Roy 2010, a) gable roof, hip roof (Ahmad and Kumar 2001;Irtaza et al 2015;Tecle et al 2015;Habte et al 2017), isolated pitched roof (Bourabaa et al 2015), tall chimney (Verma et al 2015;Khan and Roy 2017) and tall structures (Paul and Dalui 2008;Amin and Ahuja 2014;Kar and Dalui 2016;P. Martinez-Vazquez 2016;Sanyal and Kumar 2018), and aim to provide information about the consistency of performance and the upgrading of design economy (Isyumov 1999).…”

Bilateral Interference of Wind Loads Induced on Duplicate Building Models of Various Shapes

“…The majority of researchers' interference studies, according to the existing literature, are aimed to determine the most useful configuration settings and/or interspacing among the obstructing models of rectangular or square plan shape buildings, as mentioned in the studies by Lam et al (2011), Hui et al (2012, Zu and Lam (2018a,b), Yu et al (2015), and Mara et al (2014). There are only a few studies in the literature that deal with interference effects on unusually shaped tall buildings as investigated by Amin and Ahuja (2012), and Kar and Dalui (2016). As a result, interference observations of unconventional plan shape buildings with the same or different plan shape obstructing buildings are accounted for.…”

Proximity effects between two plus-plan shaped high-rise buildings on mean and RMS pressure coefficients

“…It was discovered that the close proximity between buildings generates high negative peak pressure on the surfaces facing the gap. Kar and Dalui [35] investigated the wind interference effects in mean pressure coefficients on an irregular shape building due to a group of three square plan buildings of the equal heights at different locations in along-wind and across-wind directions. Li and LI [36] investigated the interference effect on the irregular shaped twintall tapered buildings with recessed corners.…”

“…Although numerous research work has been done to investigate the interference effects between building with square, rectangular or circular sections [1, 8, 9, 12, 16, 18, 31-32, 43, 46-53], the interference effects between unconventional plan tall buildings had been rarely studied [26,[35][36][37][38][39]54]. Also, studies on proximity effects between closely spaced tall buildings are rare [23-25, 28, 34, 38].…”