Research On Transmission Mechanism And Ultimate Bearing Capacity Of Rectangular Steel Tube Columns Reinforced By Intermittent Angle

With the rapid development of the economy of the times,the steel structure has developed rapidly in the construction industry.During the use of the steel structure,due to its own rust and other defects,the strength and durability of the steel structure are reduced,resulting in the whole The structure can not be used normally,or people need to strengthen the structure to effectively extend the structural life and meet the function of the structure.Therefore,the reinforcement technology of the steel structure has become the mainstream of the construction industry.In this article,combined with experimental,theoretical analysis and finite element software analysis,the force transmission mechanism and ultimate bearing capacity of rectangular steel pipe columns strengthened with intermittent angle steel are studied.Make the following work and results:(1)Through the study and summary of a large number of related documents,the research route,angle reinforcement theory and reinforcement method are determined,which provides the theoretical basis for the later research in this paper.(2)Three sets of standard tensile test pieces were taken on the base metal of diagonal steel and rectangular steel pipe column respectively,and the stress-strain curves of each group were obtained,which provided the material data for numerical simulation.(3)The axial compression tests of reinforced and unreinforced rectangular steel pipe columns are carried out;Reinforcement includes intermittent welding(100mm welds at both ends are connected to 600mm angle steel and rectangular steel pipe pillars without splicing,100mm welds at both ends are connected to 600mm angle steel and rectangular steel pipe pillars,100mm welds at both ends are connected to 600mm angle steel and 60mm welds in the column)Reinforced rectangle with continuous welding angle steel Steel pole.According to the test phenomenon and test data,the load-displacement curve chart is drawn,the failure morphology,ultimate bearing capacity and transmission mechanism of the sample are obtained,and the reliability of the numerical simulation data and the stress cloud map are verified by using finite element software analysis.(4)The eccentric compression test and finite element software analysis of the reinforced and unreinforced rectangular steel pipe columns were carried out;Reinforcement includes intermittent welding(100mm welds at both ends are connected to 600mm angle steel and rectangular steel pipe pillars,100mm welds at both ends are connected to 60mm angle steel and60mm welds in rectangular steel pipe pillars)and continuous welding corner steel reinforced rectangular steel pipe columns,eccentric distance is 25mm.According to the test phenomenon and the test data,the load-displacement curve chart is drawn,and the failure morphology,ultimate bearing capacity and transmission mechanism of the specimen are obtained.Then the numerical simulation data and stress cloud diagram are obtained by finite element software analysis.The stress cloud diagram reflects the trend of stress,and the finite element results are compared with the experimental results to verify the reliability of the data.(5)The bearing capacity test of the double-armed angle steel verified the reliability of the finite element software analysis data,and systematically calculated its buckling coefficient.At the same time,the effects of L _w,f _y,residual stress and initial geometric defects were also studied.Finally,combined with the problems studied in this paper,some suggestions and prospects are put forward.The paper has 136 figures,12 tables,and 58 references.