考虑剪切变形的蜂窝夹层木质复合梁弯曲特性研究

Bending performance of sandwich beam with wooden top and paper of honey-comb core

为了分析夹层梁的弯曲特性,建立了基于Reissner理论的横向位移表达式,并进行实验验证,结果表明:小弹性变形范围内,考虑剪切变形的理论模型能够比较精确地模拟实际承载实验中的变形与位移,但对芯层较小的夹层梁预测精度较低。芯层厚度对夹层梁的横向位移影响显著,随着芯层厚度的增加,蜂窝夹层梁的横向剪切变形、纯弯曲变形逐渐减小,但减小的幅度值随着芯层厚度的增加而减少,剪切变形占总横向位移的比重越来越大,在同样的受力条件下,"∥"试件的剪切变形大于"⊥"试件。

In order to analyze the bending performance of sandwich beam, a simple transverse displacement model based on Reissner theory was set up. After comparison with test results, it is shown that the method considering shear deformation is a good tool to forecast the deformation of sandwich beam with relative high accuracy while it is not suitable to the ones with thin honey-comb core. In addition, the thickness of core has significant effect on the transverse displacement, and the shear and bending deformation is decreased gradually with increasing core thickness but the declining speeding become smaller, furthermore the ratio of shearing deformation to the total is increased accordingly, and the samples of ＂//＂ direction has smaller shearing deformation than the ones of ＂⊥＂ direction under the same condition and loading level.