Research On The Bearing Capacity Of Steel Mesh-confined Concrete Under Axial Compressio

In order to meet the demand for rapid development of engineering construction,countries around the world have gradually increased the concrete grade used.Compared with ordinary concrete,high-strength concrete has advantages such as higher strength-to-weight ratio,smaller cross-sectional dimensions of components,increased use of building space,reduced structural weight,and better compactness.Therefore,the economic benefits of using high-strength concrete are high.However,the most prominent problem is its brittleness,which can lead to brittle failure without obvious signs of deformation,directly affecting the safety of building structures.Therefore,while considering improving the strength of concrete,its brittle defects must be improved.Especially in areas with frequent earthquakes,improving the ductility of concrete is crucial.This article proposes the use of high-strength steel wire mesh to constrain high-strength concrete to achieve the above objectives.The aim of this article is to establish a stress-strain relationship model for high-strength steel wire-constrained concrete under axial compression,to provide theoretical and experimental basis for the design method of high-strength steel wire-constrained concrete,and to guide its application in engineering.This article conducted axial compression tests on 64 standard test blocks of high-strength steel wire-constrained concrete,studied their mechanical properties,and analyzed key factors such as the yield strength of the steel wire,volumetric reinforcement ratio,wire spacing,and concrete strength.The study showed that reasonable configuration of steel wire mesh can improve the ductility and compressive bearing capacity of constrained high-strength concrete.With the increase of volumetric reinforcement ratio and the decrease of wire spacing,the compressive bearing capacity and ductility of the constrained concrete are improved,and the unevenness of the constrained concrete and the brittleness of the high-strength concrete can be effectively improved.In addition,compared with ordinary steel wire constraint,the use of high-strength steel wire mesh constraint cannot significantly improve the compressive strength of the specimen,but can significantly improve its ductility.The high-strength steel wire did not yield during the peak stress of the constrained concrete,but mainly played a more effective constraint role in the descending section.Therefore,this article proposes a theoretical formula for calculating the actual stress of the steel wire.This article also sorted and analyzed the test data of prismatic specimens of steel wire mesh-constrained concrete through fitting,and based on summarizing the existing stress-strain relationship models of steel-constrained concrete both domestically and internationally,proposed a design-oriented stress-strain relationship model of high-strength steel wire mesh-constrained concrete suitable for engineering design.The calculation results of this model are close to the experimental results and can be used to analyze the stress analysis of high-strength steel wire-constrained concrete.