Mechanical Properties Of FRP-reinforced Concrete Beams Under The Chemical-mechanical Coupled Action

The reinforced concrete members which corroded by acid in the atmosphere, as well as the physical load are seriously damaged. The durability and service life of structures are significantly declined. How to reinforce a structure to enhance its security and usability has become the focus of international civil engineering sector. In recent years, with the development of new materials, using fiber reinforcement for concrete structures reinforcement has been possible. But report about reinforcement with FRP under the coupling between chemical and load is very few, research needs to be carried out. With funding from the National Natural Science Foundation of "chemical and vehicle coupling study on bearing capacity of reinforced concrete bridge", the evolution of flexural behavior of reinforced concrete beams attacked by the coupling of chemical-mechanical is studied, and the reinforcement effect with FRP material under acid rain environment is evaluated, and Models of concrete beams are built, numerical simulations are tested.1. The reinforced concrete beams in size of1800mm×120mm×200mm are prepared. They are placed in acidic solution (pH1.5) while a external loads (0.02Pu) are put on the top of the concrete beams. There are two forms of beams for FRP reinforcement (Full and half package). The strength and injury thickness of the beams are measured through the ultrasonic yester. The first-order frequency of beams is measured by vibration. Cracking load, ultimate load and load-deflection curves of the beams are measured through the bending test. The chance of appearance and the cracks in concrete beams are analyzed and the effects about the FRP reinforcement are evaluated.2. The finite element software ANSYS is used to simulate the reinforced concrete beams. The model of reinforced concrete beams is established and the bending tests of the beams which are reinforced by FRP are simulated. The simulated data and test data are operated to quantify the extent analysis of reinforced concrete beam which strengthened with FRP. Through the creation of models of reinforced concrete beams, conditions is created for solving beam in non-experimental capacities and creating conditions with finite clement model.