Abstract

Info

Title:: Research on Axial Compressive Properties of Preloaded Concrete Columns Strengthened with Prestressed CFRP Sheets

Author(s):: CHENG Dong-hui; YANG Yan-hong; School of Civil Engineering, Northeast Forestry University

Keywords:: prestressed CFRP sheet; strengthening; circular concrete column; axial load test; mechanical property

Abstract:: In order to study the mechanical properties of preloaded circular short concrete columns strengthened with prestressed carbon fiber reinforced polymer (CFRP) sheets under axial compression, 11 circular short concrete columns were designed, including an ordinary concrete column served as reference column and 10 columns strengthened with prestressed and nonprestressed CFRP sheets at preloaded and nonpreloaded states, respectively. The ultimate loads, axial deformations and stress variations of materials were obtained by the axial load test. The mechanical properties of the test columns under axial compression were analyzed based on the test data. The results show that the yield loads of the preloaded concrete columns strengthened with prestressed CFRP sheets compared with the ordinary column are significantly improved in the second load, and the increased range is proportional to the prestress level of CFRP sheets. However, the ultimate bearing capacities of the test columns have no obvious relationship with the prestress level of CFRP sheets. The ductility of the preloaded concrete columns strengthened with prestressed CFRP sheets is improved significantly.