Experimental Study Of High-strength Concrete Columns Strengthened With RPC Under Small Eccentric Loading

With further theoretical reseach on compressive strength of concrete, Theextensive use of high-strength concrete in high-rise building, towering and large-spanstructures can improve the economic and social benefits that has proven to be one ofthe most effective methods. However, As improving the strength ofconcrete,high-strength columns’ ductility will be reduced. Under the action of loaddestruction of structure is abruptly and no clear signs,the concrete damage isbrittleness. Adopting reactive powder concrete (RPC) reinforcement of reinforcedhigh-strength concrete structures can effectively improve their deformation andductility. While also helping to improve the fire resistance of structural components,corrosion and erosion resistance and other properties. Excellent interfacial adhesionfunction make the overall good performance of the original components a ndreinforcement layer. Therefore, RPC steel mesh reinforcement for high strengthconcrete of research results will guide the reinforcement method in practicalengineering application, Thereby creating a favorable social and economicbenefits.According to above problems,the main aspect rearch are as follows:（1）By the destruction test to a small bias of5high-strength columns incompression, it is studied that RPC steel mesh reinforcement improves strength anddeformation properties of high Strength Concrete Columns, Whether Changes in thestrength grade of reinforcement layer and the inducton of steel mesh can improvereinforcement effect or not has been primarily taken into account.The results suggeststhat the bearing capacity and deformation behavior of concrete columns under smalleccentric load were improved greatly after confining with RPC steel meshreinforced,The steel mesh Participation has obvious effect to test result, and in thesame condition only RPC intensity altering have weak effect to test result of smalleccentricity specimens, it is proved that the RPC columns will produce peeling failurein experiment, is not conducive to the promotion in practical engineering, therefore inthe follow-up work there is no theoretical formula and the finite element whichrenfoced by pure RPC. Based on the experimental phenomena and results, the basicassumption of calculation of RPC steel mesh reinforcement are provided, Andconsidering the longitudinal reinforcement layer mesh side impact bars and RPC, onthe basis the normal section formula of calculating its bearing capacity is derived in RPC steel mesh reinforcement high Strength Concrete Columns.（2）Nonlinear finite element methods is employed to simulate the process of theloading test in reinforcement columns,which obain the specimen’s bearingcapacity,the deformable imagery and the distribution of the reinforcement layer and’sstress and strain, then the test values are compared with the results of model, Theresults of finite element analysis software can provide reference for practicalengineering.