考虑杆件弯曲与锈蚀影响的圆钢管轴压性能研究

Study on Axial Compression Performance of Circular Steel Tubes Considering Initial Imperfections and Corrosion Effects

摘要: 为了揭示初始缺陷与均匀锈蚀对圆钢管在轴压作用下的极限承载能力影响，采用有限元方法对圆形钢管的极限抗压承载力规律进行研究。考虑了基于杆件一阶模态的初始缺陷大小、均匀锈蚀程度对圆钢管极限抗压承载力的削弱，揭示了折减系数随初始缺陷大小和锈蚀程度对圆钢管杆件极限抗压承载力的变化规律，可为评估既有圆钢管杆件极限抗压承载力提供理论基础。

Abstract: To investigate the effects of initial imperfections and uniform corrosion on the ultimate axial compressive capacity of circular steel tubes, a finite element method was employed to study the corresponding load-bearing behavior. The study considered the reduction in ultimate compressive capacity caused by initial imperfection amplitudes—based on the first-order buckling mode of the member—and various degrees of uniform corrosion. The variation of reduction factors with respect to imperfection size and corrosion level was revealed, providing a theoretical basis for evaluating the ultimate axial compressive capacity of existing circular steel tube members.