Experimental and numerical simulation of load bearing capacity of concrete columns strengthened with CFRP sheets
[Objective]The destructive analysis of concrete columns strengthened with different layers of CFRP through axial compression tests is carried out to select the optimal number of layers,and based on this,further analysis is conducted on the parameters of concrete strength and slenderness ratio.[Methods]The universal testing machine is used to conduct axial compression tests on concrete column specimens strengthened with different layers of CFRP,while the commercial finite element software,ABAQUS,was used for simulation verification and parameter analysis.[Results]The results of the axial compression tests,including the ultimate load bearing capacity and load-displacement curve,indicate that the CFRP sheets has significant effect on improving the compressive capacity of concrete,especially for C30 concrete with the two layers'reinforcement.The finite element simulation results show that the strengthening efficiency of CFRP sheet decreases with the increase of concrete strength;when the slenderness ratio is more than 2∶1,the CFRP sheets have little effect on the ultimate load bearing capacity of CFRP reinforced concrete columns when subjected to eccentric loading.[Conclusions]Through the analysis of axial compression tests on concrete column specimens strengthened with different layers of CFRP,this paper has identified the optimal number of reinforcement layers.At the same time,corresponding finite element models have been proposed,which show good agreement with the experimental results.Based on the finite element models,a comprehensive analysis of concrete strength and specimen slenderness ratio parameters has been conducted,providing a reference basis for the practical engineering application of CFRP-reinforced concrete columns.
carbon fiber reinforced composite(CFRP)axial compression testmodel validationfinite element analysis
万方数据
维普
