I-girder窄缘工字纵梁;单腹板梁;工字大梁
tapered I-girder楔形工字梁
i beam girder工字梁
prestressed i-girder预应力工型梁
i-girder detail工字形大梁
web plate in I-girder工字梁腹板
I-beam girder工字钢梁
i-type steel girder上承式钢板梁
welding I-shaped crane girder焊接工字形吊车梁