在简单工程学结构的应用，比如标尺，轴，横梁和构架支撑。
Application to simple engineering structures such as rods, shafts, beams, and trusses.
然后根据依据建筑物的柱子、横梁以及构架和联系的设计来准备需要的材料。
And then you get into all kinds of things in terms of the designs of the columns and the beams and the framing of the building and the connections.
构架 横梁的中间段在工地用螺栓连接。
The cross girder center segments of the bents were field bolted.
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