摘要
提出基于整体简化概念的双轴对称等效截面,配合作者建议的正则化长细比和近似稳定系数公式,使单轴对称工形截面简支梁的整体稳定计算十分简便。与现有试验资料对比,精度优于现行钢结构设计规范。另外,还讨论了单轴对称截面的应用问题,指出用于剪心承载的梁,加强受压翼缘的效益低于其他荷载的情况。最优的单轴对称率应使稳定和强度承载力相平衡。
Based on the concept of global simplification, an equivalent doubly symmetric section is put forward. Combined with the formulas of normalized slenderness ratio and those of stability coefficient suggested by the author, this approach leads to quite simple calculation of overall stability of simply supported beams with monosymmetric I-section. By comparing with available test data, it is shown that the precision of this approach is better than the current code for design of steel structures. The application of monosymmetric section has also been discussed. It is pointed out that the benefit from strengthening the compressive flange is lower for beams with load applied at the shear center comparing to other loading cases. The optimum degree of monosymmetry should procure a balance between stability and strength capacity.
出处
《钢结构》
2008年第8期14-19,共6页
Steel Construction
关键词
梁
单轴对称
屈曲
稳定
整体简化
beam monosymmetry buckling stability global simplification
