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主要用于房屋结构的我国通用规范《钢结构设计规范》(TJ17-74),将于今年开始进行修订。本文就钢梁侧扭屈曲问题简单介绍当前国内外的理论和试验研究概况,评述各国现行设计规范中采用的验算方法,供我国修订有关条文时参考。钢梁最常用的截面是工字形,其绕截面两主惯性轴的惯性矩往往相差极大,即I_x》I_y。跨度中间无侧向支承的梁在最大刚度平面内承受横向荷载或力矩作用时,当荷载到达一定数值,常迅速产生较大的侧向位移u和扭转角θ,使梁丧失承载能力。这一现象叫做侧扭屈曲或丧失整体稳定。研究钢梁的侧扭屈曲,就是要求得产生侧扭屈曲时的临
The general specification of China’s steel structural design code (TJ17-74), which is mainly used for housing construction, will be revised this year. This paper briefly introduces the theory and experimental research at home and abroad on the problems of lateral-torsional buckling of steel beams, and reviews the verification methods used in the current design specifications of various countries for reference in the revision of relevant provisions in China. The most commonly used section of a steel beam is an I-shape, and its moment of inertia around the two principal axes of inertia of the section is often very different, ie I_x”I_y. When the beam with no lateral support in the span is subjected to lateral loads or moments in the plane of maximum stiffness, when the load reaches a certain value, a large lateral displacement u and torsion angle θ are often rapidly generated, resulting in loss of the bearing capacity of the beam. This phenomenon is called lateral-torsional buckling or loss of overall stability. To study the lateral-torsional buckling of steel beams, it is required that