均布荷载作用下腐蚀贝雷桁架稳定承载力研究

The Bailey truss is commonly used in temporary structures such as high-rise building machine. However, Bailey trusses are commonly exposed to corrosion. Given the current lack of suitable bearing capacity design methods for corroded Bailey trusses, the stability capacity of single-span Bailey trusses with member corrosion was investigated in this paper. Based on the existing design methods of prefabricated highway steel bridges, the influence of three types of corroded members (chord, diagonal and vertical members) on the stability capacity of the Bailey truss under uniform load was analyzed by finite element model and the bending test. The results show that the failure mode of a single-span Bailey truss with the span of 6 meters is primarily shear failure, gradually transitioning to flexural-torsional buckling failure as the span increases. As the degree of corrosion deepens, the cross-sectional area and material properties of each member in Bailey trusses show a linear decreasing trend，with the largest decrease observed in parameters related to the chord. A calculation formula for the stability capacity of corroded single-span Bailey trusses was proposed, showing good agreement between the calculated results and finite element analysis results.