求翻译：拱肋为主要承重构件，受力特点为拱肋承压、支承处有水平推力。主要材料是圬工、钢筋砼，适用范围视材料而定。跨径从几十米到三百多米都有，目前我国最大跨径钢筋砼拱桥为170米。是什么意思？

Rib as the main load-bearing components, the mechanical characteristics of Rib pressure support at the level of thrust. The main materials are masonry, reinforced concrete, the scope of application depends on the material. Span from tens of meters to more than three hundred meters, China's largest s

Arch rib is the main load bearing components, the force is characterized