薄壁层合箱梁的无外约束扭转分析

TORSION ANALYSIS OF COMPOSITE THIN-WALLED BOXBEAMS WITHOUT EXTERNAL RESTRAINT

本文在考虑应力沿壁厚非均匀分布前提下，计入各种耦合效应，利用复合材料层合板理论对薄壁层合箱梁的“自由”扭转进行了分析，给出了变形及各铺层应力的计算公式，并指出，对于层合箱梁来说，由于耦合效应使得严格意义上的自由扭转往往不存在，而只能称之为无外约束扭转。最后，通过算例对数值结果进行了分析验证。

In this paper, considering that stresses along wall thickness are distributed non-uniformly, a theory of torsion analysis of composite thin-wall boxbeams without external restraint, based on the theory of composite laminated plates, was developed. In the theory, various coupled effects were taken into account and formulas of deformation and stress were presented. The results of analysis indicate that due to coupled effects, in general, the pure torsion of composite boxbeam may not exist, so a concept of torsion without external restraint is suggested. Finally, the numerical results are verified and analysed.