An A-frame is a basic structure designed to bear a load in a lightweight economical manner. The simplest form of an A-frame is two similarly sized beams, arranged in a 45-degree or less angle, attached at the top.
The all-welded, a-frame pylon straddles the deck . 全焊接的A形框架式的塔柱与桥面叉开。
The a-frame pylon harmonizes with the tall spires of the adjacent cathedral . A形塔架同附近教堂的高耸尖塔十分协调。
Mobile front-bucket loaders often suffice for handling and retrieving rock in a-frame structures . 对于A形结构用活动的前端斗式装卸机处理和运送石块。