起重机设计中受弯构件整体稳定性问题研究

Study of the Overall Stability of Curved Members in the Design of Cranes

钢箱梁的整体稳定性好,现行的《起重机设计规范》仅通过限制钢箱梁截面的高宽比(即h/b0≤3.0)来保证其整体稳定性。随着钢结构技术的不断进步,所用钢材的强度越来越高,特别是某些特种设备由于工程环境的限制而采用高而窄的箱梁,其截面的高宽比就有可能突破《起重机设计规范》中的相应规定。以《钢结构设计规范》为依据,采用有限元分析,通过对不同高宽比截面钢箱梁的模拟计算,得到钢箱梁不需要计算整体稳定性的高宽比条件放宽到h/b0≤4.0后仍可满足相应规范要求。为起重机钢箱梁设计提供了有益的借鉴。

Due to the good stability of steel box girders,in the current 《Specifications for the Design of Cranes》,the overall stability is only ensured by limiting the ratio of height to width of the of steel box girders（namely,h/b0≤3.0）. With the continuous development of the technology in steel structures,the strength of the steel used becomes increasingly high.However,because of the requirements of certain special equipment used for the steel girder in its working environment,the ratio of height to width of the cross-section of the steel box girder may have to exceed the regulations prescribed in 《Specifications for the Design of Cranes》.In the light of 《Specifications for the Design of Steel Structures》and through the finite element analysis method,steel box girders with different ratios of height to width are simulated and calculated in the paper,which shows that the overall stability can still be guaranteed when the ratio of height to width of steel box girders is increased to h/b0≤4.0.The result of our research may serve as a beneficial reference for the design of the steel box girders of cranes.