竹梁在破坏前，横截面应变沿高度方向的分布基本上呈线性，平截面假定是成立的。
Before the failure of bamboo beams, cross-section strain distribution along the height was linear, and the plane-section assumption was established.
试验表明，截面应变沿宽度方向呈非线性分布，剪力滞效应随荷载的增加而变化，并不是常量。
The study demonstrates that the section strain along the width is nonlinearly distributed and that the effect of the shear lag is not constant and changes with the increment of the load.
结果显示，变形区内横截面应变分布非常复杂，腹板和翼板间的金属交换在不同变形区域内发生方向变化。
The strain in the deformation zone distributes very complicatedly in cross section. The metal exchange between web and flange takes place in alternative direction as the deformation is in progress.
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