腹板开孔冷弯薄壁卷边槽形钢柱偏心受压性能研究与承载力计算OA

In order to analyze the buckling behavior and the design method of the bearing capacity of cold-formed thin-walled lipped channel steel columns with web openings under eccentric compression,the eccentric compression tests of 72 cold-formed thin-walled lipped channel steel columns of different sections and lengths with circular and rectangular web openings were carried out under different eccentric loading modes.Test results indicate that the members experience local buckling,distortional buckling,and in-plane flexural instability.The bearing capacities of specimens with the same cross section are reduced by 5.06％to 37.24％due to web openings.This capacity is inversely proportional to the opening size,with rectangular holes generally having a greater impact than circular holes(resulting in a maximum reduction of 37.24％).Furthermore,columns with openings offset towards the web exhibit a higher bearing capacity than those with openings offset towards the lip.A finite element analysis model was developed using ABAQUS for the simulation.The simulation results are in good agreement with the experimental results,thereby confirming the validity of the finite element model.The parametric finite element analysis shows that the eccentricities and the types and dimensions of the holes are the key factors affecting the load-carrying capacities.Based on experimental and finite element analysis results,a design method for determining the stability bearing capacity of eccentrically-compressed cold-formed thin-walled lipped channel steel columns with web openings was proposed.A comparative analysis between the calculated results of the proposed method and the experimental and finite element analysis results demonstrates that the proposed method is reasonable and feasible.