Mechanical Properties of RC Stub Columns with Corroded Stirrups Strengthened by Grouted GFRP Jackets Reinforced with CFRP Grids Under Axial Compression
Mechanical Properties of RC Stub Columns with Corroded Stirrups Strengthened by Grouted GFRP Jackets Reinforced with CFRP Grids Under Axial Compression
Through conducting axial compression tests on 13 RC stub columns with corroded stirrups strengthened by grouted GFRP Jackets reinforced with CFRP grids,the effects of the number of CFRP grid layers and stirrup corrosion rate on the load-axial displacement curve,ultimate bearing capacity and damage pattern of the specimens were investigated.The results indicated that:the overall performance of the rein-forced columns was brittle failure;the fiberglass sleeve reinforcement increased the ultimate bearing capaci-ty of the stirrup-corroded RC columns by 59.4%,and the CFRP grids as a reinforcing material increased the ultimate bearing capacity of the reinforced columns by 87%;the number of CFRP grid layers had a grea-ter influence on the load-axial displacement curves of reinforced columns than the corrosion rate of stirrups,and the more the number of layers,the more obvious the strengthening degree of the curves in the elasto-plastic stage;the ultimate bearing capacity increased with the increase of the number of CFRP grid layers;the ultimate bearing capacity increased with the increase of the corrosion rate of stirrups,and the increase of the ultimate bearing capacity showed a decreasing trend.The research results of the experiments could provide an experimental basis for the reinforcement of bridge abutments with corroded stirrups in practical engineering.
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