The results show that the latter welding method delivers higher load capacity and slightly lower stiffness of main girder, and simpler welded structure and technology.

• 计算结果表明：加强板在受拉翼缘处空开时，主梁的承载能力比加强板四周均焊时高，且简化了焊接结构与工艺，但主梁刚度比加强板四周均焊时略小。