Wind tunnel test on wind pressure distribution on the roof of hemispherical coal storage yard
The hemispherical coal storage yard structure is highly sensitive to wind loads due to its large span and extensive coverage,making wind loads a controlling factor in the structural design.The distribution of wind pressure on the roof of a hemispherical coal storage yard was studied through wind tunnel tests.The average wind pressure coefficient contour,fluctuating wind pressure coefficient contour,and corresponding roof partition shape coefficients of the structure were obtained at 24 wind directions.The results show that under the action of wind load,the average wind pressure coefficient distribution on the windward surface of the hemispherical coal storage yard structure roof is perpendicular to the incoming flow direction and forms an equal pressure strip;The fan-shaped area below the windward surface is mainly subjected to wind pressure,with the maximum value occurring at the bottom edge of the windward surface of a hemispherical roof;The upper part,both sides,and leeward area of a hemispherical roof are mainly affected by wind suction,with the maximum value occurring near the eaves area affected by ventilation openings;When the transfer tower is located on both sides of the roof in the downwind direction,the negative pressure in the roof area near the transfer tower will show a large value,with an average wind pressure coefficient of-1.40;Due to its highest height,the ventilation area at the top of the roof has the highest suction force at all wind angles.In some areas,the body shape coefficient reaches-2.15 at a 60° wind angle,making it more susceptible to damage.Based on the test results,design suggestions for the roof of hemispherical coal storage yard are proposed.
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万方数据
