求翻译：本桥采用现行公路桥涵设计规范，恪守“安全、经济、适用、美观”的基本原则，并兼顾当地的地形条件和对桥涵的通车平顺要求以及自己的设计理论水平，采用变截面连续刚构桥是什么意思？

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This axle is equipped with a covered by existing road bridge design specifications, and adhere to the "security, economic, and aesthetic principles of balance, and the terrain and conditions covered by the bridge of the yangs commissioning requirements as well as their own design theory level, and a

This bridge uses the present road arch of bridge design standard, scrupulously follows “the security, the economy, are suitable artisticly,” basic principle, and gives dual attention to local the topographical condition and is open to traffic the smooth request to the arch of bridge as well as own d

正在翻译，请等待...

正在翻译，请等待...