Design method for concrete columns strengthened with prestressed CFRP sheets

摘要: Abstract To improve upon the bearing capacities of short circular concrete columns strengthened with carbon fiber reinforced polymer (CFRP) sheets, this paper conducted experimental and numerical investigations to study influencing factors on compressive strength CFRP-strengthened columns, including preloading prestressing applied CFRP sheets number layers sheets. The test consisted an un-strengthened control column in addition 10 preloaded non-preloaded compression one or two at prestress levels either 300 MPa 600 MPa. These were tested under axial load. failure modes, stress changes, load–longitudinal displacement behaviors specimens recorded discussed. Furthermore, finite element models (FEM) developed validated by comparing curves obtained through analysis (FEA) those retrieved experimentally. A parametric was subsequently performed using FEM investigate effects preloading, layers. demonstrated that strain lag caused negatively related columns. In addition, could reduce negative utilization tensile strength. yield load improved correlative increment Conversely, whereas ultimate only it had no obvious relationship instead their Based data, capacity formulas for prestressed proposed. Subsequently, presented confirmed be reasonably accurate calculated numerically measured