钢构件整体稳定直接分析法研究现状及展望

钢构件整体稳定设计的基础理论不仅是结构设计的依据，也是钢结构直接分析法发展和完善的重要基础。以轴压构件、受弯构件和压弯构件为研究对象，对中国、美国、欧洲现行钢结构设计标准GB 50017—2017、ANSI/AISC 360-16、EN 1993-1-1: 2005中钢构件整体稳定(弯曲失稳、扭转失稳、弯扭失稳)设计的基础理论进行了归纳与总结。基于初弯曲轴压构件弯曲失稳设计的基础理论，揭示了初始几何缺陷对钢构件整体稳定的分析过程和分析结果的影响。从完整的步骤、完备的表达式两方面归纳了钢构件整体稳定的构件直接分析法的应用情况。并就轴压构件、受弯构件以及压弯构件整体稳定的构件直接分析法的研究现状进行了分析，指出了存在的问题，并对后续研究进行了展望。

State-of-the-art on research of direct analysis method of steel members with global instability

The theory of global stability for steel members is not only the basis of structural design,but also the fundamental basis for the development and improvement of the direct analysis method of steel structures. Taking members in axial compression, members in bending and members in bending and compression as the research focus, the theory of global stability (flexural instability, torsional instability and flexural-torsional instability) for member design approaches was summarized, according to the Chinese standard (GB 50017—2017), the United States specification (ANSI/AISC 360-16) and Eurocode (EN 1993-1-1: 2005). Based on the theory of flexural instability for axial compression member with initial geometric imperfection, the influence of the initial geometric imperfection on the analytic process and the analytic results was revealed. The application of direct analysis method for steel members with global buckling was summarized from two aspects: the completeness of the calculation steps, and the completeness of the expressions. The state-of-the-art research of the direct analysis method were analyzed for steel members in axial compression, in bending and in both bending and compression. The existing problems were pointed out, and the follow-up research was prospected.