初始扭转轴压杆弯曲屈曲性能有限元验证分析

Research of elastic flexure buckling performance of pre-twisted bar under axial pressure

通过对初始扭转轴压杆弹性弯曲屈曲性能的研究表明:初始扭转轴压杆弹性弯曲屈曲位移在两截面主轴平面上相互耦合。初始扭转角使得强轴对压杆绕弱轴的屈曲位移产生"抵抗"作用,从而提高了杆的弹性弯曲屈曲临界荷载。以有限元法对初始扭转角不同的轴压杆进行参数分析表明,弹性弯曲屈曲变形后,其位移曲线是一条空间曲线,随着初始扭转角的增加,屈曲后位移曲线偏离同一平面的幅度变大。

Pre-twisted construction members have wide-ranging application in engineering design. This paper investigates into the elastic flexure buckling performance of such members under axial pressure. The study indicates the buckling equilibrium equations of pretwisted perfect axial pressure bar intereouple in two principal axis directions, and the buckling critical bearing capacity is ascending. At the same time, the paper makes finite element parameter analysis of perfect axial pressure bar with variation of pre-twisted angle. The results indicate buckling displacement curve is a spatial curve, not same plane. Also, deflection amplitude variation increase more and more to the same plane with adding of pre-twisted angle.