traffic lever 中文意思是什麼
traffic lever
解釋
定向挺桿-
To find a solution to these problems, starting with understanding of road function, this thesis grades road style with new standard, classifies priority of traffic volumes on different type of roads. this thesis also studies and analyzes the elements of cross - section, affords suggestion about each special contents and ideal road standard cross - section which match to practice. by these methods, it can increase the efficiency of road network, improve traffic environment and improve efficiency and service lever of traffic facilities
針對這些問題，從科學發展觀出發，對橫斷面設計理論分析，從理清道路功能入手，對道路等級再次分級，區分不同類別的道路上各類交通的優先級，同時對橫斷面各組成要素研究分析，提出各專項內容的改進建議及理想的道路標準橫斷面，以提高道路網的運轉率，從而改善交通環境、提高交通設施服務水平與效率，為規劃、設計、管理部門提供基礎。 -
But the double arch bridges have demerits, for the design lever and the load criterions on the low side then, and the steel is scarce in the structure. when the bridges are loaded heavily, and in heavy traffic for long time, most of them are damage
但是限於當時設計水平和荷載標準偏低，結構鋼材用量少，雙曲拱橋存在著先天不足，特別是在長期重荷載、大交通量的運營情況下，大部分雙曲拱橋都出現了不同程度的病害，許多已成為危橋。
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