Experimental research and theoretical analysis on bearing capacity of parallel reinforced components of angle steel for transmission towers
In order to meet the long-term safe operation of the transmission structure,two non-destructive parallel reinforcement measures based on the parallel reinforced components were proposed without destroying the original angel steel section and weakening the section.Through the axial compression test of single angle steel and reinforced angle steel and the finite element analysis,the load-displacement curve and load-vertical strain curve of each specimen were obtained.The failure mechanism and reinforcement mechanism of the specimen were analyzed,and the influence of the angle steel strength,the number of hoop connectors,the length of the hoop connectors,and the slenderness ratio of the members on the bearing capacity of the reinforcement members were clarified based on the parameter analysis.Based on the calculation method of bending,torsion,and bending-torsional buckling,the formula of bearing capacity based on parallel reinforcement were proposed,and the validity of the theoretical formula was verified.The results show that the unreinforced angle steel is prone to bending and torsional instability failure.By increasing the bending stiffness of the section and altering the instability mode of the composite members,the reinforcement schemes can enhance the ultimate bearing capacity and improve the stiffness and deformation performance after instability.The finite element model can effectively reflect the failure mode of the members.Increasing the strength of the main angle steel enhances the bearing capacity but has no effect on the deformation capacity.The clamping connectors have no significant impact on the performance after reinforcement,and there is a positive correlation between the slenderness ratio and the reinforcement efficiency.The derived calculation theory for the critical force of bending and torsional instability facilitates the calculation of the ultimate bearing capacity of the reinforced members,which is conducive to promoting the application of non-destructive parallel reinforcement measures.
万方数据
维普
