考虑剪滞剪切效应的复合材料薄壁箱型连续梁理论分析

以含三次项的四次抛物线作为箱梁翼缘板的纵向位移函数,推导出了考虑横向剪切变形及剪力滞后效应时的双轴对称铺设的复合材料层合箱梁在对称弯曲条件下的控制微分方程,并推导出了两等跨连续梁分别在跨中受一集中力P的位移差函数,最后结合具体的复合材料箱型连续梁实例,将本文理论推导的结果与ANSYS结果以及实验结果进行了对比,结果表明,理论推导的结果与ANSYS结果和实验结果吻合较好,其结果是正确可靠的。

Theoretical Analysis of Composite Thin-walled Box Continuous Beam Considering Vertical Shear Deformation and Shear Lag Effect

In this paper,four-degree parabola of cubic term is adopted to simulate axial displacement of box beam flange,considering vertical shear deformation and shear lag effect,differential equations of symmetrically laminated composite box beam under symmetrical bending have been deduced firstly,and displacement difference functions in two-equal-span continuous beam under concentrated load P applied at mid-span respectively have been also deduced.Finally,based on a concrete example of composite thin walled box continuous beam,comparing the theoretical results of this paper with the result of the ANSYS finite element simulation and experiment results,it is demonstrated clearly that this method agrees well with the ANSYS finite element and experiment,so the results are reliableand accurate.