EFFECT ON WIND PRESSURES BY VARIATION OF ROOF PITCH OF LOW-RISE HIP-ROOF BUILDING
Author(s):
Abstract:
The paper presents a numerical study of wind pressure on the low-rise hip-roof building by varying the roof pitch using computational fluid dynamics (CFD). A Texas Tech. University building models with hip roof, reduced at a geometric scale of 1:50 were numerically simulated for the present study. Various hip-roof building models of different roof pitches as usually used in different parts of the world, such as, 15°, 20°, 30° and 40° were selected with different wind angle attack i.e. 0°, 45° and 90°. The numerically computed wind pressure coefficients on the roof of the hip-roof buildings were compared with the wind-tunnel results. Two RANS (Reynolds Averaged Navier-Stokes) turbulence models such as the Standard 𝑘−𝜀 (SKE) and the Renormalization group 𝑘−𝜀 (RNG-KE) were adopted in this study keeping in mind the computational resources available.Result shows that roof pitch does affect the magnitude of wind pressures coefficients but the pattern almost remains same. The model with roof pitch 30° amongst the various models was found to have maximum wind pressure. It was also found that the results obtained using the CFD turbulence models and the wind-tunnel data are in good agreement with in certain limit.
Keywords:
Computational fluid dynamics , wind force , hip , roof building , low , rise building , RNG , SKE , wind engineering
Language:
English
Published:
Asian journal of civil engineering, Volume:16 Issue: 6, Dec 2015
Pages:
869 to 889
magiran.com/p1414514
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