Experimental Study On Seismic RC Columns Strengthened With Prestressed Steel Wire Mesh And High Performance Mortar

The reinforcement technology of high strength steels wire mesh and high performance mortar is a new reinforcement technology,has the characteristics of durability,fire resistance,strong corrosion resistance,convenient construction and extensive application etc.Existing research shows that The reinforcement technology of non prestressed has the phenomenon of reinforcement material hysteresis.The initial stress is applied to the high strength steel wire,can promote the original cracks closed,and it also makes full use of the performance of high strength steel wire.In order to investigate the influence of the parameters of prestress level,the characteristic value of steel wire and the axial compression ratio on the seismic behavior of RC columns.In this paper,8 specimens(including 1contrast specimen and 7 specimens)were tested under low cyclic loading.Analysis of the crack mode each specimen,the reciprocating load stiffness degradation,energy dissipation and ductility changes.Furthermore analysis the influence of seismic parameters to reinforced columns.Experimental results show that:The reinforcement technology of prestressed steel wire can obviously improve the seismic performance of RC columns;Compared with the unreinforced specimens,the hysteresis curve of the reinforced specimens are more fuller,the plumpness of reinforcement spacing of 30 mm hysteretic curves is superior to specimens of 60 mm reinforcement spacing;The stiffness of the specimens reinforcement is flat,the energy consumption and ductility of the specimens are improved to a great extent.The reinforcement spacing of 60 mm specimens energy and displacement ductility are increased by 1.56 times and 1.27 times,the reinforcement spacing of 30 mm specimens were increased by 3.42 and 1.72 times.Finally,through the use of reasonable material constitutive model,and plane section assumption,Combineing with Clough restoring force model of hysteresis rules;Considering the seismic parameters of axial compression ratio,stirrup ratio,steel strand characteristic value to influence of cross section stiffness change,and study the hysteretic curve to each specimens.Experimental results show that the hysteric curve are consistent with the experimental results.In this paper,the restoring force model considered influenced facts and reverified by testing,and provide theoretical basis of the design and application of actual engineering.