考虑横向剪切效应的竹材层合板弯曲变形

Bending Deformation of Bamboo Laminates with Consideration of Transverse Shear Effect

用层梁经典理论、一阶剪切变形理论以及有限单元法分别计算了竹材层合板梁的弯曲变形。为验证理论分析与数值计算结果是否合理 ,对实际结构变形进行了测定。结果显示 ,竹材层合板梁在跨高比较小时具有十分显著的横向剪切效应 ;一阶剪切变形理论与有限单元法均能足够精确地反映含有剪切效应的梁的弯曲变形 ;横向剪切效应很小时 。

A bending deformation of bamboo laminates beam is respectively calculated with Classical Plate Theory(CPT),First order Shear Deformation Theory(FSDT)and Finite Element Method(FEM).In order to test whether the results obtained by theory analysis and numerical computation are rational or not, the realistic deflection of beam under loading is measured. The results show that the transverse shear effect of bamboo laminates is extremely serious while the ratio of span thickness is comparatively small;the deflection obtained by FSDT and FEM under transverse shear effect is accurate enough;as transverse shear effect is approched to feeble,the solution of CPT is closer to practice than that of FSDT.