Experimental Investigation And Theoretical Analysis For Performance Of Concrete Columns Confined With Carbon Fiber Composite Sheets

Based on the state of the art of the compressive performance of concrete confined with carbon fiber composite sheets, the performance of axially and eccentrically compressed concrete columns confined with carbon fiber composite sheets is studied by experimental investigation and numerical simulation.Through axially compressed tests of 32 concrete cylinders, the performance of concrete confined with carbon fiber composite sheets is studied. The different effects of the concrete strength, carbon fiber strengthening ratio and the sectional dimensions on the behavior of the concrete are discussed respectively. Finally, a constitutive model of concrete confined by carbon fiber composite sheets is proposed, which has clear mechanical meaning and satisfied accuracy.Through axially compressed tests of 16 concrete prisms, mechanical behavior of concrete prisms confined with carbon fiber composite sheets is investigated. For a prism, the section is divided into one effectively confined zone and four ineffectively confined zones, and the load-deformation relationship of the prism confined with carbon fiber composite sheets can be calculated using different kind of constitutive models for different kind of confined zones. The different effects of the concrete strength and the sectional dimensions on the behavior of the balanced carbon fiber strengthening ratio are discussed and an expression of the balanced carbon fiber strengthening ratio is proposed.Through eccentrically compressed tests of 8 square reinforced concrete columns, the effect of the eccentric ratio on the behavior of the reinforced concrete column confined with carbon fiber composite sheets is discussed. A numerical simulation method to calculate the response of eccentrically compressed reinforced concrete columns confined with carbon fiber composite sheets is developed, and the basic relationship between the ultimate bearing capacity of the column and the eccentric ratio, strengthening ratio and concrete strength is studied through numerical simulation tests. Finally a practical expression of the ultimate bearing capacity of the...