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基于典型桁架桥梁断面桁片节点测压风洞试验,研究了典型桁架桥梁断面-10°~+10°风攻角下的遮挡系数。试验结果表明:采用规范计算桁架桥梁断面成桥状态的遮挡系数,在计算间距比和实面积比时,建议将桥面铺装高度计入迎风桁架高度,将桥面铺装迎风面积计入桁架轮廓面积;遮挡系数随着风攻角的增大而减小,可以采用一次线性经验公式计算不同攻角的遮挡系数。
Based on the wind tunnel test of the truss node of a typical truss bridge section, the shielding coefficient at a wind attack angle of -10 ° ~ + 10 ° of a typical truss bridge was studied. The test results show that when calculating the spacing ratio and real area ratio, the height of bridge deck pavement should be taken as the height of the windward truss, and the windward area of the deck pavement should be included in the truss Contour area; The occlusion coefficient decreases with the increase of the wind attack angle. A linear empirical formula can be used to calculate the occlusion coefficient of different angles of attack.