T形截面钢压杆整体稳定计算的折算长细比法-《郑州大学学报(工学版)》

文章信息/Info

Title:: Equivalent Slenderness Ratio Method for the Stability Caculation of T-Struts

Author(s):: XIONG Xiao-li; Civil Engineering and Architecture Department，Henan University of Technology , Zhengzhou 450001,China

Keywords:: T-strut; overall stability ; flexural-torsional buckling; equivalent slenderness ratio; nonlinear a-nalysis

摘要:: T形截面轴心压杆绕其对称轴发生弯扭屈曲.当压力作用于截面的剪切中心时,T形截面压杆仅发生弯曲屈曲或扭转屈曲.尽管T形截面压杆绕对称轴屈曲时,剪切中心加载时的屈曲荷载大于轴心加载时的屈曲荷载,但若其具有初弯曲、初偏心及残余应力等缺陷,当压力由形心移至剪切中心时,压杆的整体稳定设计承载能力将会降低.提出了一种T形截面压杆设计计算的新方法——折算长细比法,并将该方法与陈绍蕃提出的计算方法、现行规范中的计算方法以及有限元法进行对比后指出新方法合理、简捷,值得推广应用.

Abstract:: T-struts subject to centroid compression buckle flexural-torsionally about their axis of symmetry.When the foree is applied at the shear center of the section,T-struts buckle either flexurally or torsionallywithout coupling of flexure with twisting.Although the buckling load about the symmetry-axis of shear centerloading is greater than that of centroid loading，the design capacity of T-struts with defect such as fabricationerror, load eccentricity and residual stress decrease by shifting the working line of a T-section compressionchord to the shear center. This article presents the equivalent slenderness ratio method,a new method for thedesign of ’T-struts subject to compressive force,introduces another three methods including the one presentedby Chen Shaofan,the one in code and the one in ANSYS,contrasts the calculation results of those four meth-ods and recommends the implementation of equivalent slenderness ratio method in the design of T-struts subjectto compressive force.