| A large number of experimental and theoretical studies have beencarried out on carbon fiber reinforced polymer (CFRP) strengthenedconcrete structure by many scholars of domestic and foreign. However,there are few papers research on slab-column structure strengthened withthe CFRP. Therefore, the CFRP reinforced slab-column structure isstudied as following in this thesis.Experimental studies for flexural behavior are carried out onunreinforced slab-column structure and reinforced slab-column structurestrengthened with CFRP. RC two-way slabs are used to simulate theactual stress condition of the slab-column structures by adjusting loadingmethod and boundary condition. Four structural test models are made.Two structural test models are unreinforced, one is reinforced with CFRP,and the last one is secondarily loading reinforced which is loaded to crackbefore strengthening, and then reinforcing with CFRP after removing theload. The bearing capacity, failure mode, fissure developing condition,displacement developing condition and stiffness of the test models forslab-column structures are studied. It concluded that the CFRP canimprove the flexure bearing capacity, restrain the increase of thedisplacement, delay the cracking speed, raise the cracking load andimprove the stiffness. The failure mode and ultimate bearing capacity ofthe slab-column structure are different under different constrainedconditions.The failure mechanism that is similar with failure mode is choosedaccording to the failure mode of the slab-column structure. Thecalculation approach for flexure ultimate bearing capacity of theslab-column structure is derived by the plastic hinge theory. The resultsindicate that the calculation approach is reasonable and meet theengineering requirements. The slab-column structures are analyzed by finite element method inthis thesis. The numerical results show that the fissure developingcondition, state of stress, and load-deflection curve of the slab-columnstructures are anastomotic with the experimental results. Therefore, thefinite element model that is built in this thesis can be used to analyze theflexural behavior of the slab-column structure strengthened by the CFRP.The destruction of the slab-column structures strengthened with CFRPis debonding failure in the experiment. Debonding failure has a largerinfluence on the strengthening test of the slab-column structures. TheCFRP should be anchored for improving its utilization efficiency. |
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