Generally speaking, the bridge structure incorporating the flexible arch principle in material mechanics can disperse every point of pressure to the cross-section equally.
通俗地讲，运用材料力学的弹性拱原理造桥，这种结构就可以将受力点的力分散到桥的每一个横截面上。
Free-flow tunnel used more round arch straight wall form cross-section.
无压隧洞多采用圆拱直墙形断面。
The cross section of arch rib except the part closed to the arch springer is new dumbbell-shaped section which is different from the traditional one.
该桥拱肋截面除拱脚段外采用与传统哑铃形截面不同的新型哑铃形截面。
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