鉴于受弯构件整体稳定计算比较复杂,现行《钢结构设计规范》(GB 50017—2003)除给出了正规稳定系数φb的计算公式外,还给出了此系数的近似计算公式,后者主要用于压弯构件弯扭屈曲的计算。新修订的《钢结构设计规范》(送审稿)对梁的整体稳定计算做出较大修改,但计算依然较为复杂,仍然需要新的简化公式与之配合。经过分析和比较,推荐了工形截面和T形截面构件受弯屈曲时稳定系数φb的简化公式。为了适用于压弯构件,推演公式时紧密结合这类构件的具体情况:工形截面着眼于框架柱,T形截面着眼于承受节间荷载的桁架受压弦杆。推荐的公式具有较好的精确度,但不宜广泛用于一般受弯构件。 In view of the complexity of the overall calculation of flexural members is more complex, in addition to the formula for the formal stability coefficient φb given in the “Code for Design of Steel Structures” (GB 50017-2003), the approximate formula for this coefficient is given, the latter mainly Used in the calculation of flexural and torsional buckling of compression and bending members. The newly revised “Code for Design of Steel Structures” (draft for review) greatly modifies the overall stability of the beam, but the calculation is still rather complicated and still requires a new simplified formula. After analysis and comparison, the simplified formula of the stability coefficient φb for work-section and T-section is recommended. In order to apply to the bending and bending components, the formula of this formula is closely combined with the concrete situation of this kind of components. The working section focuses on the frame column, and the T-section focuses on the truss compression chords subjected to internode load. The recommended formula has better accuracy, but it should not be widely used in general flexural members.