The influence of support stiffness on the effective calculated length which plays an essential role in the axial compression stability of steel memeber is always ignored due to the ideal support constraint that is difficult to achieve in the test. In this paper, the calculation method of the effective length factor was put forward by the mechanical model of the axially compressed member. The supports rotation stiffness of large-size and high-strength steel angle sections (LHS) under the test condition were measured, and the effective length of each specimen was modified. And 36 LHS members were tested under axial load. Then the stability responses for LHS members were studied using finite element analysis considering more section profiles and the wide range slenderness ratios. Moreover, the buckling strengths were compared with the current design codes. The results show that the support constraint has a significant influence on the bearing capacity of the LHS member. Considering the influence of support restraint, when the slenderness ratio is small, the stability factor is higher than the column curve in current codes; when the slenderness ratio is large, b-curves in both GB50017-2017 and Eurocode 3 are conservative, whereas other codes are marginally unsafe. Finally, a new column curve was proposed to predict LHS members’ capacity more accurately.

由于在试验中难以达到理想的支撑约束，因此总是忽略了支撑刚度对有效计算长度的影响，而有效计算长度对钢构件的轴向压缩稳定性起着至关重要的作用。本文通过轴向压缩构件的力学模型，提出了有效长度因子的计算方法。测量了试验条件下大尺寸和高强度钢角钢（LHS）的支座旋转刚度，并修改了每个试样的有效长度。在轴向载荷下对36个LHS构件进行了测试。然后，考虑到更多的截面轮廓和较宽的细长比，使用有限元分析研究了LHS构件的稳定性响应。此外，将屈曲强度与当前的设计规范进行了比较。结果表明，支撑约束对LHS构件的承载力有显着影响。考虑到支撑约束的影响，当长细比较小时，稳定系数高于现行规范中的柱形曲线。当细长比大时，GB50017-2017和欧洲规范3中的b曲线都是保守的，而其他规范则稍为不安全。最后，提出了新的柱状曲线以更准确地预测LHS成员的能力。当细长比大时，GB50017-2017和欧洲规范3中的b曲线都是保守的，而其他规范则稍为不安全。最后，提出了新的柱状曲线以更准确地预测LHS成员的能力。当细长比大时，GB50017-2017和欧洲规范3中的b曲线都是保守的，而其他规范则稍为不安全。最后，提出了新的柱状曲线以更准确地预测LHS成员的能力。