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研究了用曲线纤维实现变刚度概念的薄壁组合梁可能的性能改进。钢梁的截面为封闭截面,模型中考虑了一些非典型作用如材料各向异性、横向剪力、翘曲限制和非均匀扭转的影响。控制方程由扩展的Hamilton原理导出,运用扩展的Galerkin方法对控制方程求解。给定几何特性和材料特性情况下,优化设计了承受不同荷载组合钢梁以承受最大极限承载力。给出了变刚度梁相对于常规的恒刚度梁的改进之处。
The possible performance improvement of the thin-walled composite beam with variable stiffness realized with curvilinear fibers was studied. The cross-section of the steel beam is a closed cross-section. The model considers some atypical effects such as material anisotropy, transverse shear, warpage limits and non-uniform torsion. The governing equations are derived from the extended Hamilton principle and the governing equations are solved using the extended Galerkin method. Given the geometrical and material properties, the steel beams subjected to different loads are optimized to withstand the maximum ultimate load. The improvement of the variable stiffness beam relative to the conventional constant stiffness beam is given.