作为叠合梁斜拉桥，四方台大桥的主梁由下部的工字钢和上部的混凝土行车道板组合而成。
Harbin sifangtai bridge is a cable-stayed bridge whose girder is composed by steel i-beam above and concrete deck slab below.
在纯弯或纯剪分别作用下的工字形焊接板梁，在弹性范围内腹板屈曲时，翼缘会对腹板起约束作用。
When a welded I-section plate girder is subjected to bending or shearing, buckling of web in elastic range will be restrained by flanges.
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