进行了纵筋加强箱形薄壁梁模型的循环弯曲试验。
Cyclic bending tests of a box girder with longitudinal stiffeners were also carried out.
考虑箱形截面梁剪力滞后效应的影响，利用推导出的箱形截面梁的弯曲振动方程及其自然边界条件，并据此进一步推导出了多跨箱形截面梁的固有频率方程。
Thinking over the influence of box beams shear lag effect, making use of the governing different equations and related natural boundary conditions of bending vibration to box girder.
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.
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