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欧洲规范3的第1-1节中提出了用于计算结构构件侧向和侧向扭转屈曲的一般方法,主要采用Merchant-Rankine经验公式求解平面内和平面外效应。应用了梁元、壳元理论和欧洲规范3中基于欧洲屈曲曲线图集的其他方法,模拟了等截面杆的轴压、弯曲及压弯组合作用的加载情况,对第1-1节中推荐方法的安全性进行了评估。从具有不同长细比的柱和梁中推导出了计算方程。同时也对横截面形状、加载类型、长细比和钢材等级等进行了参数研究。结果表明:提出的计算方法也能与欧洲规范3第1-1节中的条款6·3·1至6·3·3中提出的方法具有相似的安全性。
Section 1-1 of Eurocode 3 proposes a general method for calculating lateral and lateral torsional buckling of structural members using the Merchant-Rankine empirical formula to solve in-plane and out-of-plane effects. The beam element, shell element theory and other methods based on the European buckling curve atlas are applied to simulate the loading of axial compression, bending and buckling combined action of the section rod. The safety of the method was evaluated. Calculated equations are derived from columns and beams with different slenderness ratios. At the same time, the cross-sectional shape, loading type, slenderness ratio and steel grade were studied. The results show that the proposed method of calculation can also have similar safety as the one proposed in Clauses 6.1-3.6-3.3 of European Specification 3, Section 1-1.