所属单位：土木工程学院

发表刊物：Structural Engineering and Mechanics

关键字：中文关键字：初始扭转杆件；屈曲；扭转屈曲；耦合；有限元，英文关键字：pre-twisted bar; flexural buckling; torsional buck

摘要：According to deformation features of pre-twisted bar, its elastic bending and torsion buckling equation is developed in the paper. The equation indicates that the bending buckling deformations in two main bending directions are coupled with each other, bending and twist buckling deformations are coupled with each other as well. However, for pre-twisted bar with dual-axis symmetry cross-section, bending buckling deformations are independent to the twist buckling deformation. The research indicates that the elastic torsion buckling load is not related to the pre-twisted angle, and equals to the torsion buckling load of the straight bar. Finite element analysis to pre-twisted bar with different pre-twisted angle is performed , the prediction shows that the assumption of a plane elastic bending buckling deformation curve proposed in previous literature (Shadnam and Abbasnia 2002) may not be accurate, and the curve deviates more from a plane with increasing of the pre-twisting angle. Finally, the parameters analysis is carried out to obtain the relationships between elastic bending buckling critical capacity, the effect of different pre-twisted angles and bending rigidity ratios are studied. The numerical results show that the existence of the pre-twisted angle leads to “resistance” effect of the stronger axis on buckling deformation, and enhances the elastic bending buckling critical capacity. It is noted that the “resistance” is getting stronger and the elastic buckling capacity is higher as the cross section bending rigidity ratio increases.

备注：黄莺

合写作者：ChangHongChen,YaoYao

第一作者：黄莺

论文类型：期刊论文

卷号：卷：49

期号：期：2

页面范围：页：273-283

是否译文：否

发表时间：2014-02-01