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Wind and Structures   Volume 24, Number 2, February 2017, pages 95-118
Effect of internal angles between limbs of cross plan shaped tall building under wind load
Debasish Kumar and Sujit Kumar Dalui

Abstract     [Buy Article]
    The present study revealed comparison the pressure distribution on the surfaces of regular cross plan shaped building with angular cross plan shaped building which is being transformed from basic cross plan shaped building through the variation of internal angles between limbs by 15 for various wind incidence angle from 0 to 180 at an interval of 30. In order to maintain the area same the limbs sizes are slightly increased accordingly. Numerical analysis has been carried out to generate similar nature of flow condition as per IS: 875 (Part –III):1987 (a mean wind velocity of 10 m/s) by using computational fluid dynamics (CFD) with help of ANSYS CFX (k-e model). The variation of mean pressure coefficients, pressure distribution over the surface, flow pattern and force coefficient are evaluated for each cases and represented graphically to understand extent of nonconformities due to such angular modifications in plan. Finally regular cross shaped building results are compared with wind tunnel results obtained from similar \'+\' shaped building study with similar flow condition. Reduction in along wind force coefficients for angular crossed shaped building, observed for various skew angles leads to develop lesser along wind force on building compared to regular crossed shaped building and square plan shaped building. Interference effect within the internal faces are observed in particular faces of building for both cases, considerably. Significant deviation is noticed in wind induced responses for angular cross building compared to regular cross shaped building for different direction wind flow.
Key Words
    CFD; wind incidence angle; cross plan shaped building; k-e turbulence model; pressure co-efficient and force coefficient
Debasish Kumar and Sujit Kumar Dal: Civil Engineering Department, Indian Institute of Engineering Science and Technology, Shibpur, Howrah-711103, India

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