大跨脊谷式索膜航站楼风荷载特性风洞试验研究

脊谷式索膜屋盖因其独特的曲面造型,屋面的风压分布复杂,风敏感性强烈。为深入研究这种屋面的风荷载特性,基于岳阳三荷机场航站楼大跨脊谷式索膜屋盖缩尺模型风洞测压试验,研究了大跨度索膜屋盖的风压分布特性。试验结果表明,脊谷式屋盖风压以负风压为主,屋盖角区部分极值风压较大且变化梯度大,其他部位的极值风压较为平稳。随跨度增大,角部区域风压极值明显大于规范取值。根据屋盖体型及风压分布试验结果,对屋盖进行了局部区域划分,并给出了区域体型系数建议值。

Wind tunnel test study on wind loading characteristics of ridge-valley long-span cable membrane for terminal buildings

Ridge-valley cable-membrane roof has complex wind pressure distribution and strong wind sensitivity because of its unique curved surface. In order to study the wind loading characteristics of this kind of roof, the wind pressure distribution measurements in the wind tunnel are performed based on the scale model of Sanhe Airport Terminal in Yueyang. The test results show that the wind pressure of the ridge-valley roof is dominated by the negative wind pressure, the extreme wind pressure in the corner of the roof and the variation gradient of the wind pressure are much larger, while the extreme wind pressure in other parts is more stable. With the increase of span, the extreme value of wind pressure in corners is obviously greater than that in codes.According to the test results of roof shape and wind pressure distribution, the roof is partitioned locally and the recommended value of regional shape coefficient is given.