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压弯构件(包括偏心压杆)一般在弯矩作用平面内的抗弯刚度较大。对于这样的构件当其侧向没有足够支承时,就有可能产生侧向弯曲扭转屈曲而丧失承载能力,我们常称之为弯矩作用平面外的稳定问题或弯曲扭转屈曲问题。国内外有关钢结构设计规范,对于压弯构件在弯矩作用平面外的计算公式,一般有两种表达形式。一种是单项公式,如我国《钢结构设计规范》(TJ17—74)、苏联建
The bending and bending members (including the eccentric pressing rods) generally have a large bending rigidity in the plane of action of the bending moment. For such a component, when it is not supported laterally enough, it may cause lateral bending torsion and buckling and lose the bearing capacity. We often call it the out-of-plane stability problem or the bending-torsional buckling problem. Domestic and foreign steel structural design specifications, there are generally two expressions for the calculation formula of the bending and bending member outside the plane of bending moment. One is a single formula, such as China’s “Steel Structure Design Specification” (TJ17-74), the Soviet Union built