Wind tunnel test on wind load characteristic of low-rise sloping roof buildings

Wind tunnel test on wind load characteristics of low-rise gable and hip roof buildings were presented.The mean wind pressure and fluctuating wind pressure coefficient of roof with different parameters,which include roof shape,wind attack angel,roof pitch and length of roof overhang,were analyzed.The results show that high suction is formed on eave and ridge of windward roof.The pressure coefficient on windward roof shows ring-form distribution feature when the roof pitch is 30° in 0° wind direction,which is vertical to the roof ridge,and stepped distribution feature when the roof pitch is 15°.Wind direction,roof pitch and roof shape show more influence on the shape coefficient of building.The shape coefficient of windward roof on gable roof model with 15° roof pitch in 0° wind direction is 2.76 times more than that of 30° roof pitch.The shape coefficient of windward roof on hip roof with 15° roof pitch in 0° wind direction is 2.28 times more than that of 30° roof pitch.The roof pitch doesn't affect the shape coefficient of leeward roof.When the gable roof is changed into hip roof with the same roof pitch as 15° or 30° in 0° and 45° wind directions,the absolute value of shape coefficient of windward roof is increased greatly and the windward roof becomes easier to be destroyed.However,there is little influence on leeward roof.