Experimental Research On Mechanism Of Bond Between Carbon Fiber Reinforced Polymer And Steel Plate

It is a new form of reinforcement for concrete structure to strengthen them with combination of bonded steel plates and carbon fiber reinforced polymer sheets(CFRP) ,which can cover the shortage of single reinforcement method. On one hand , the combining strength enhancement can meet the improving requirements for load-carrying capacity, on the other hand, it may solute the anchorage problems of CFRP and makes the construction procedure convenience. The bond performance between steel-plate and CFRP must be fine in order that the combining strength enhancement can have widespread engineering application. Based on this purpose, the bond performance between steel plate and CFRP has been studied in this paper, which can provide a theoretical basis for strengthening steel structure with CFRP and strengthening concrete structure with combination of bonded steel plates and CFRP. And main conclusions are the following:1. Based on many specimens results of the shear bond test of steel plate and CFRP, the failure process and characteristics of bond test are described, and characteristic of the stress distribution is discussed. The calculating formulas of ultimate bond strength and the effective bond length are established according to experiment results and former conclusions, and the comparisons are carried out among calculated results and test results, which is anastomotic.2. Based on many specimens results of the vertical tension bond test of steel plate and CFRP, the failure process and characteristics of bond test are described. And the effect on vertical bond strength of steel plate and CFRP caused by bond area of CFRP, thickness of bond line, surface treating of steel plate are analyzed.3. Based on the tensile experiment of steel plate bonded by CFRP, the failure process and characteristics of tension test are analyzed, which provides a theoretical basis for establishing the calculating formula of bearing capacity. According to the date collection in the test, load-strain curves have been drawn in different influencing factor, for instance, the width of steel plate, thickness of CFRP, the ratio of CFRP. And the effect on the load-carrying capacity of steel plate and CFRP caused by those factor are studied. The practical calculating method of load-carrying capacity is given according to related theories.