Study on mechanical behavior of angle steel of transmission tower strengthened with GFRP sheet
To address the issue of insufficient bearing capacity of existing transmission towers under the effects of ice coating,wind load,and slope deformation,this study investigated the mechanical properties of GFRP-reinforced angle steel for tower reinforcement.First,numerical test methods for reinforced steel were verified using physical experiments from literature.Then,72 finite element analysis models were established based on the validated numerical test methods,with angle steel as the research object,to explore the effects of slenderness ratio,number of GFRP layers,and bonding length on the ultimate bearing capacity of angle steel.Finally,the theoretical bearing capacity calculation method of GFRP-steel composite components was derived and improved.The results show that the slenderness ratio has a significant impact on the ultimate bearing capacity of the component.When the slenderness ratio of the angle steel is greater than 70,the increase in bearing capacity after reinforcement is not significant.Increasing the number of GFRP layers significantly increases the bearing capacity of angle steel,with the highest increase rate of 41.03％achieved with 8 layers of GFRP fabric.The increase in bearing capacity of angle steel w ith 75％bonding length of GFRP fabric in the column is not significant comparing to the anglesteel with 100％bonding lenth,only ranging from 0.27％to 2.10％.After introducing a correction coefficient to the theoretical bearing capacity calculation method of GFRP-steel composite components,the relative error between numerical experiments and theoretical calculation values is reduced to-2.70％to 1.77％,effectively improving the accuracy of the theoretical solution.Therefore,when reinforcing existing towers,it is only necessary to reinforce 6-8 layers of GFRP fabric on 75％of the full length of the angle steel,and the reinforcement effect is better for angle steel with a slenderness ratio less than or equal to 70.
transmission towercomposite materialnon-destructive reinforcement of steel structureultimate bearing capacitycorrection factor
万方数据
维普
