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用有限元方法研究偏压单角钢的性能,并将数值模拟结果对AISC规范中建议的梁柱交互作用方法的有效性进行了验证。数值模拟结果全面论证了规范公式的保守性,并对导致这种保守性的可能原因进行了探讨。研究结果表明:在引起主轴方向弯曲的偏心压力下,每种不同长细比的构件都存在特定的临界偏心率。只要实际偏心率在临界偏心率以内,偏心引起的构件承载能力的降低是非常小的。为此,提出了一个计算主轴方向压弯构件的公式,计算了各种基于试验承载能力比的不同几何尺寸的单角钢的目标可靠度,并与AISC规范的公式进行了对比。
The finite element method is used to study the performance of bias single angle steel. The results of numerical simulation are verified by the validity of the proposed beam-column interaction method in AISC code. The numerical simulation results fully demonstrate the conservativeness of the canonical formula and discuss the possible causes of such conservativeness. The results show that there is a certain critical eccentricity for each member with different slenderness under the eccentric pressure that causes the bending of the principal axis. As long as the actual eccentricity is within the critical eccentricity, the reduction of bearing capacity due to eccentricity is very small. To this end, a formula for calculating the component of the main-axis bending and bending is proposed. The target reliability of the single-angle steel with different geometrical dimensions based on the test bearing capacity ratio is calculated and compared with the AISC code.