The main girder has the same construction that the boom girder.
主梁具有相同的建设，繁荣梁。
Firstly, analyze the main girder stress in different stage in the paper.
首先，本文分析了桥梁成桥阶段应力。
Use optimized computer design box type girder as main support grider.
△以计算机优化设计的箱形梁作为主承载梁。
Use optimized computer design box type girder as main support grider.
△以计算机优化设计的箱形梁作为主承载梁。
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