The Application And Research Of Relief Method About Carbon Fiber Sheet Strengthen RC Bridges

Based on the technology analyses of strengthening reinforced concrete beams with carbon fiber sheet, and the research of calculate theory, The paper raises the technology of Relief method. Through the tests of bridge loaded, The paper discusses the principle of technology, controlling of the target, and the key points of the technology.Having drawed lessons from research achievement of the Post-Strain, This paper, Through parameter analysis of the Post-Strain from the Post-Strain formulation of "The Technical Specification for Reinforcement and Repair of Concrete Structure with Carbon Fiber Sheet", suggests a simplified calculation method for calculating the post-strain of carbon fiber sheet for application in engineering project.Based on the analyses of tests, the paper directs against the failure forms of the cross section of the bending concrete structure strengthened by carbon fiber by use of the double-critical factors method. The formulas for calculation of the ultimate bearing capacity of single and double reinforced rectangular cross sections for each failure form are set up. Consequently the design calculation of the cross section of the concrete structure strengthened by carbon fiber agrees well with the current code.Through the defect research of Prestressed carbon fiber sheet and the analyses ofcalculate theory, The paper raises the technology of Relief method and discusses the principle of technology, and the key points of the technology.With the background of the bridge, The paper will make a detailed introduction on the process of design. And Through tests of concrete beams with CFS, It is verified that this method is effective and practical.