箱形梁弯曲时，平截面假定已不能满足要求，产生剪力滞效应。
When box beam is bent, the assumption that the section is plane is not satisfied and the shear lag is produced.
根据平截面假定和应变协调条件计算的受弯承载力与实测值符合较好。
The flexural strength calculated on the basis of the plane section assumption and strain compatibility condition agrees well with the test results.
无粘结筋的变形不符合平截面变形假定，因此由外荷载引起的应力计算比较复杂。
The computation of stress resulted by external load is relatively complex because the deformation of unbonded prestressed strand cannot comply with the plane section assumption.
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