Experimental Study On The Corrosion Fatigue Performance Of RC Beams Strengthened With Prestressed B/C HFRP Sheets

A new model testing machine of fatigue is developed; the experimental study on the corrosionfatigue performance of RC beams strengthened with prestressed B/C HFRP sheets is investigated inthis thesis. The main research contents and conclusions are as follows:1. The new model testing machine is developed autonomously, and the cost including itsproduction, conduct and maintenance of the machine is cheap. Similarly, the characteristic of thetension and anchorage devices have the advantages of simple and reliable compared with thetraditional process. The test adopted the new monitoring method of digital microscope monitoringmethod in the prestress control.2. Some beams were tested including2specimens (one is reinforced, other is unreinforced) forstatic tests,2specimens which is unreinforced for corrosion fatigue and0ther4reinforced specimensfor corrosion fatigue purpose. The goal is to do experimental study and theoretical analysis ofcorrosion fatigue performance of RC beams strengthened with prestressed B/C HFRP sheets, thesebeams are testing on different reinforcement, different environment and different prestress levels offatigue. Analysis of the static tests can get the ultimate load of the RC beams. Meanwhile, the papershould analysis that the mid-span of the beams almost remain linear or not, the performance of thereinforced B/C HFRP and the crack development of the beams. Then, the study was carried out for thefatigue behavior of unreinforced beams and beams strengthened by non-prestressed FRP which are indifferent environment; finally, the experiment is for beams of fatigue properties in corrosionenvironment which are reinforced by different prestress levels. When the experiments were finished,the paper is mainly from the test phenomena, failure mode, the mid span deflection and fatigueflexural rigidity and other aspects of analysis. The results indicate that prestressed B/C HFRP sheetscan increase the corrosion fatigue performance of the strengthed beams, and the fatigue performanceof strengthened beams increases with the increasing of prestress levels within limits of this paper.3. Based on the the theory of calculation method of fatigue flexural rigidity, the paper deducedcalculation formula of the flexural rigidity of the beam. Comparative analysis of experimental data, ithas a certain reliability and accuracy. The paper also put forward the formula for calculating themaximum crack width of the beams. The calculation formula has some practical application value andprovides references for engineering practice.