Experimental Study On Behavior Of FRP Anti-buckling Strengthening Steel Members

Natural disasters led to hidden and heavy dangers of the national importantstructure, together with steel structure design failure, must be necessary for both steelstructure of attention for the current engineering personnel. The structuralstrengthening of old structure is the best way to fix, if used well, can not only reducethe construction cost, and apparently, shorten the construction period. Nearly20years,in the field of structure engineering application development of FRP materials israpidly, has now become the third largest modern building material after the concrete,steel, in view of this kind of material breed more, comprehensive advantagesobviously, the reasonable FRP used in all kinds of structures in structure engineeringdevelopment has become an important direction of the structural strengthening.The method of FRP Anti-Buckling Strengthening Steel Members has a largeamount of advantages, lightweight, safe, fast and efficient construction characteristics,and conforms to new green, low carbon materials of sustainable development for thestate which is a long-term strategic goal. On account of the concept of BucklingRestrained Brace， this paper puts forward a new type of FRP Anti-BucklingStrengthening Steel Members test plan, through the three slenderness ratios (138、113、71), two kinds of FRP sleeve combination structure form (FRP tubes, FRPseams-tubes), single axisymmetric with axis reinforcement performance test, the testand the results of the preliminary research summary, getting failure mode for9steelsamples structure, stress distribution, deformation pattern, the correspondingcalculation theory, etc.Through the analysis of the results for the test data, get the structure systemrelative to traditional bare steel components stress axis capability have numeroussignificant advantages, FRP Anti-Buckling Strengthening Steel Members for thesingle axisymmetric steel components system can obviously improve the bare steel components and the ductility of the peak deformation ability, etc. At the same time,with theoretical derivation, established calculation formula of axial compressionperformance reinforced for the FRP Anti-Buckling Strengthening Steel Members, andcomparing with the results of the finite element numerical analysis, and the results canprovide valuable data for the electric power industry standard "fiber reinforcedcomposites reinforced steel structure repairing with technical specification".