【作者】 顾石川；

【导师】 苏明周； 顾强；

【作者基本信息】 西安建筑科技大学 ， 结构工程， 2004， 硕士

【摘要】 国产热轧角钢分为等边与不等边两类。等边角钢截面为单轴对称截面，除绕非对称轴失稳为弯曲失稳外，绕其他任意轴均为弯扭失稳。不等边角钢截面为无对称轴截面，绕任意轴失稳均为弯扭失稳。我国现行钢结构设计规范(GB50017)采用换算长细比的方法将弯扭失稳等效为弯曲失稳，其残余应力和初始几何缺陷均按弯曲失稳考虑。虽然这样可以避免复杂计算，但因缺陷对弯扭失稳的影响不同于对弯曲失稳的影响，使得计算的精确度和安全度难以保证。本文采用极限强度理论和通用有限元分析软件ANSYS，系统深入地研究了单角钢轴心受压构件的弯扭失稳，并与多本规范进行了对比分析；在此基础上提出简单实用的稳定系数计算公式，以便工程设计参考。更多还原

【Abstract】 Hot-rolled angles are classified as equal and unequal angles. An equal angle section, being a singly-symmetric section, will buckle in a torsional-flexural pattern about any axis except for flexural buckling about the unsymmetric axis. Being an unsymmetric section, an unequal angle section is torsional-flexural buckling. In active code for design of steel structures, axially compressed members are calculated not as torsional-flexural buckling but as flexural buckling with equivalent slenderness ratio, residual stress and initial geometry imperfection are also taken into account as flexural buckling. Although this can avoid the complicated calculation, it is difficult to calculate a member precisely and safely because the influence of imperfection for torsional-flexural buckling is not same as the one for flexural buckling. In this paper, torsional-flexural buckling of single-angle members is researched deeply and systematically by ultimate strength theory and general FEM analysis software ANSYS, and is contrasted with some codes, as a result the simple and practical formulas for stability coefficient are recommended for design purpose.更多还原