Secondary buckling mode of shallow arches depended on the ratioofrise to gyration radius.
对于矢跨比较小的坦拱，矢高与截面回转半径的比值将决定拱的屈曲形式。
2
The relationship between frequency and prestress, ratioofrise to span of tensioned cable and membrane structure are also studied.
系统分析了索膜结构自振特性与预应力、矢跨比、索初始应力等的关系。
3
In America, where progress has been fastest, the Reinharts reckon that about half the rise in the ratioof credit to GDP accumulated during the boom era has been unwound.