With innovative structural characteristics and fine mechanical behavior, flat steel box girder is now the main structural style of large span bridges girders.
扁平钢箱梁具有新颖的结构特点和优良的受力性能，已成为现代大跨度桥梁加劲梁的主要结构形式。
Based on the wind tunnel tests for large span cantilevered flat roof, the distributing characteristics of mean local shape factor and extreme local shape factor of the roof are studied.
本文结合一大跨悬挑平屋盖模型的风洞试验研究，分析了此类结构屋盖的平均局部体型系数和极值局部体型系数的分布特性；
Compared with railway tunnels, the span of highway tunnels is large and their flat ratio is low.
与铁路隧道相比，公路隧道跨度大，扁平率低，开挖多采用分部法。
Compared with railway tunnels, the span of highway tunnels is large and their flat ratio is low.
与铁路隧道相比，公路隧道跨度大，扁平率低，开挖多采用分部法。
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