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复合材料剪切模量通常比弹性模量低1个数量级,这就导致复合材料梁结构剪切效应比普通梁结构显著得多,尤其是梁截面高度较大的情况。作为夹胶玻璃等结构的复合材料支撑框架,复合材料方管梁翼缘通常存在较弱的胶层,此时复合材料梁横截面包含不同剪切模量的材料层,这就导致梁横截面在剪切作用下发生复杂的翘曲。剪切翘曲效应对梁结构的性能有着极大的影响,本文在分段线性位移场假设基础上,推导了对称面内变形的方管梁结构静力以及自振周期计算模型,并同经典梁理论计算结果进行对比,分析了梁几何参数、胶层力学参数等因素对两个模型计算误差的影响。计算结果表明,当胶层较弱时,弱层带来的层间剪切效应对梁的性能有着决定性的影响,此时经典梁理论不再适用。
The shear modulus of composites is usually one order of magnitude lower than the elastic modulus, which leads to the shear effect of the composite beam structure is much more than the ordinary beam structure, especially the beam height. As the composite material supporting frame with laminated glass and other structures, there is usually a weak glue layer on the flange of the square tube beam of the composite material. In this case, the cross-section of the composite beam includes material layers with different shear modulus, Complex warping occurs under shear action. The shear warping effect has a great influence on the performance of the beam structure. Based on the assumption of piecewise linear displacement field, the static and natural period model of the symmetrical in-plane deformation of the square tube beam is deduced. Beam theoretical calculation results were compared and analyzed the geometric parameters of the beam, the plastic layer parameters and other factors on the calculation of the two models error. The results show that when the layer is weak, the effect of interlayer shear effect of weak layer has a decisive influence on the performance of the beam, and the classical beam theory is no longer applicable.