Abstract
Designs of buildings are changing with emerging demands of several aesthetical features and efficient design based on geometry. Development of new building materials and construction techniques have enabled us to build new buildings which are tall and unsymmetrical, but unfortunately such structures are more susceptible to wind loads. Thus it becomes necessary to estimate wind loads with higher degree of confidence. Although ample information regarding wind load on symmetrical and regular structure is available in various international codes, they lack the study of effect of wind forces on unsymmetrical structures. This paper presents experimental and numerical studies of the wind effect on commonly used C-shaped buildings with varying aspect ratio and its optimization caused by the alteration of angle of incidence. Furthermore, results obtained by numerical analysis have been validated with the experimental one. For this study, numerical analysis has been carried out using ANSYS Fluent with k-ε model of turbulence. Computational fluid dynamics (CFD) techniques is used to evaluate the surface pressure on various faces of the model for angle of attack of 0° to 180° at an interval of 30° in a subsonic open circuit wind tunnel. The results found by CFD technique are well compared with the experimental results which suggest the feasibility of using this technique of predicting wind pressures on building efficiently and accurately.
Highlights
Gradual increase of demand of tall and unsymmetrical buildings with efficient geometric design and planning needs futuristic visionary and scientific estimates of various kinds of forces
Ample information regarding wind load on symmetrical structure is available in various international codes, for example, IS: 875 (Part 3): 1987(code of practice for wind loads for buildings and structures) [1], no such direct reference is available for irregular planshaped structures. e effect is even more critical for unsymmetrical and tall structures due to dynamic response arising from vortex shedding and galloping
Vortex generation and different types of mechanism such as separation of flow, upwind, and downwind happen due to dynamic behavior of wind flow. To investigate such mechanisms more accurately, wind flow patterns around the C-shaped building are being studied for different angle of incidences varying from 0° to 180° at an interval of 30° using the Computational fluid dynamics (CFD) technique
Summary
Gradual increase of demand of tall and unsymmetrical buildings with efficient geometric design and planning needs futuristic visionary and scientific estimates of various kinds of forces. Li et al [13] conducted the wind tunnel test on L-plan-shaped tall building to quantify dynamic load across the wind. Bhattacharyya and Dalui [14] investigated mean wind pressures on E-plan-shaped tall building and compared experimental results with numerical analysis using CFD. Numerical as well as experimental analysis has been carried out on irregular shape, i.e., Cshaped of the building for wind incidence angle of 0° to 180° at the interval of 30°. E main purpose of this paper is to assess the change in wind pressure on different faces of C-shaped model due to change in wind angle and aspect ratio (height) of the building by experimental analysis and numerical analysis, and those results were validated. It becomes necessary to compare the experimental and numerical data
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