Compressive Behavior Of Concrete Confined By Both GFRP And Steel Wire Mesh

There are a few studies about wire mesh confine concrete show that the wiremesh has better reinforcement dispersion than rebar. By wire mesh bonding withconcrete, the concrete get the uniform stress in the range of wire mesh effect and theconcrete contrained by wire mesh has good crack resistance effect and the toughness,the enhanced concrete is a high ductility and toughness of high-performance material.Although the wire mesh make confined concrete have the advantages of the ductilityand toughness, the compressive strength increase less than plain concrete. If thebrittle but high strength material GFRP is used for constraining concrete together withthe wire mesh will solve the problem of insufficient constraint stress. GFRP and steelmesh confined concrete refers to put the wire mesh tube into the GFRP pipe,and thenput the concrete into both of them, This way can save the consumption of steel andtemplate, at the same time，it enhances the axial compressive strength，ductility, thepermeability resistance and toughness of the concrete. For this new type of compositestructure (GFRP and Steel wire mesh constrain concrete together) about the axialcompression performance, we carried out the following research:(1) In order to verify the confinement of GFRP and wire mesh confined concretetogether, a total of thirty circular specimens of150mm in diameter and300mm inheight which included three unconfined column and twenty-seven columns confinedby GFRP-wire mesh were tested under monotonic axial compression load in thisarticle. The test parameters were the number of GFRP layers, the number of the wiremesh layers. The fabrication of specimens, the loading system and test datameasurement methods were also described.(2) The destruction process and morphology of specimens in each group wereexpouded. The characteristics of load–displacement curves under axial load weresummarized. The deformation properties of specimens were evaluated by thecompression toughness index. The constraint mechanism of GFRP-Steel wire meshcomposite confined concrete was illuminated. The effects of GFRP layer number,Steel wire mesh layer number on the axial compression performance were studied.(3) This article proved that the effect on strength of steel wire mesh confinedconcrete can’t be ignored compared with the GFRP-Steel wire mesh compositeconfined concrete. Based on the test results of this dissertation and other literature, ultimate stress model and ultimate strain model be used for design was developed forGFRP and wire mesh confined column under monotonic axial compression.Test results indicate: the load carrying capacity and ductility of wire meshconfined concrete column can be significantly enhanced by the GFRP tube, and thecombination of GFRP and wire mesh can be effective; Wire mesh have a littleinfluence on axial compression load of confined concrete. With the increase of thenumber of wire mesh layers, axial compressive strength of concrete column will be asmall amount of ascension, steel wire mesh on the ductility of the confined concretehas the role of promoting and make the failure modes of concrete tend to ductilefracture. Steel wire mesh play a significant role in sustaining the overall column doesnot occur brittle failure after the confined concrete column damage.