main girder meaning in English

主大梁
主梁
主桁

The main girders support i-section transverse ribs .
主梁支承着工字梁的横向肋。
The web and flanges of the main girders were fabricated from astm a441 steel .
主梁的腹板和翼缘用ASTMA441钢制造。
The beam is divided in 4 parts , two each sitting on each main girder
箱梁分为4个部分，每根主梁上2个。
The web and flanges of the main girders were fabricated from astm a441 steel
主梁的腹板和翼缘用astm a441钢制造。
Controlling the camber of main girder for the overhead travelling crane use for deadweight method
采用自重法控制桥式起重机主梁的上拱度

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