应力-腐蚀耦合作用下钢柱屈曲性能研究OA

This study investigates the buckling performance of Q335B-grade hot-rolled steel tube columns under the coupled effects of seawater-induced stress and corrosion.Based on practical engineering,a stochastic corrosion modeling program for coastal steel columns was developed and applied.Through a combination of theoretical derivation,numerical simulation,and laboratory testing,the buckling behavior of steel columns under different corrosion levels was studied.Finally,a theoretical model for the degradation of buckling performance under stress-corrosion coupling effect was proposed,which quantifies the impact of different corrosion levels.The results demonstrate that corrosion significantly reduces buckling loads during linear buckling analysis.The first-order buckling load decreases by 10.80%at a 9.97%corrosion ratio,while the third-and fifth-order buckling loads decline by 20.12%and 20.90%,respectively.Comparison between nonlinear and linear buckling results indicates that the deviation between them increases with increasing corrosion ratio,reaching 18.36%under the GK4 condition.This is because the second-order effects of initial imperfections under nonlinear conditions,superimposed with corrosion,lead to a further reduction in the buckling load.The numerical and theoretical solutions of the proposed model show good agreement,verifying its accuracy.These findings quantify the influence of corrosion on the buckling performance of steel columns and provide theoretical support for calculating the residual bearing capacity of coastal steel structures.