某超大跨度屋盖风压分布的风洞试验

Wind Tunnel Test on Wind Pressure Distribution of a Super Long-Span Roof

为研究跨度长达1.7 km的深圳国际会展中心风压分布特性,采用节段模型方法进行风洞测压试验并考虑不同展馆之间的相互干扰效应。对基于互信息的观测极值法,应用不同模型最小独立观测时距的包络值作为样本独立观测时距进行简化。结果显示:简化方法的极值风压估计结果和严格基于互信息的观测极值法结果具有很好的一致性和统计稳定性,大大提高了计算效率;屋盖整体的风压分布特征显示了节段模型方法的合理性,且采用节段模型方法可以更加细致地描述屋盖边角区域,从而更准确地获取该区域的风压分布特征;节段模型方法可较准确地反映不同展区屋盖之间的相互干扰影响,展馆间的风敏感位置的极值负压干扰系数最大可达1.26,整个屋盖结构的最小负压达-7.0 kPa,且高负压主要出现于整个屋盖角部区域,抗风设计时应对高负压角区给予足够的关注。

In order to study the wind pressure distribution characteristics of Shenzhen International Convention and Exhibition Center with a span of 1.7 km,a wind tunnel pressure test is carried out by using the sectional model method,and the interference effects between different exhibition halls are also considered.For the observation extreme value method based on mutual information,the envelope values of the minimum independent observation time interval of different models are used as the sample independent observation time interval for simplification.The results show that,the extreme wind pressure estimation results of the simplified method and the observation extreme value method based on strict mutual information have good consistency and statistical stability,and the calculation efficiency is greatly improved.Further,the wind pressure distribution characteristics of the whole roof show the rationality of the sectional model method,and the sectional model method can describe the local area of the roof corner in more detail.So,the local wind pressure distribution characteristics of the roof can be obtained more accurately.The sectional model method can accurately reflect the mutual interference between roofs in different exhibition areas.Moreover,the maximum extreme negative pressure interference coefficient of wind sensitive positions between exhibition halls can reach 1.26,and the minimum negative pressure of the whole roof structure can reach‒7.0 kPa.The high negative pressure mainly occurs in the corner area of the whole roof.Therefore,sufficient attention should be paid to the high negative pressure corner area in the wind resistance design.