WIND PRESSURE COEFFICIENT AND WIND VELOCITY ALONG BUILDING WALL OF APARTMENT BUILDING WITH BALCONY

The wind pressure coefficient is the basic driving force of wind-induced natural ventilation. The wind velocity along the building wall is also important for wind environment in balcony (veranda) or windows and is the moment of inertia for the air flowing into rooms. These two values of the five-storied apartment building with/without veranda were measured by wind tunnel test using scaled model. The experimental conditions are the façade type, the shape of veranda and wind direction. The distribution of wind pressure coefficient is not influenced so much by the type of veranda; parapet or fence. Basically, the distribution of wind pressure coefficient on the building façade depends mainly on the wind direction. Also, the existence of veranda has little effect on the wind pressure distribution. At wind direction θ=0º, the local wind velocity along the façade wall is much affected by the type of veranda. Parapet type tends to diminish the local velocity. Partition walls in veranda make the velocity along the wall more uniform and around one fifth. At windward directions, the more wind pressure coefficient the less wind velocity along the wall if there is no partition in veranda because of Bernouilli’s equation