Analysis On Performance For Reinforced Concrete Beam In Critical State With Steel Plate

As to reinforced concrete structure, the method to deal with the shortage of bearing capacity is one of the puzzles of structure engineering, so its reinforcement technology is a research hotspot. At present, although there are many reinforcing methods of existing structures, steel plate is the more widely used in engineering, because it is sturdy and durable, rapid, concise and light. The paper takes the strengthened reinforced concrete structure beam with steel plate for example, the bearing capacity in critical state, deformation and the bond crack beween steel plate and structural adhesive are studied by experiments and numerical simulation,and the content is as follow:1. As to the strengthened reinforced concrete structure beam with steel plate, the calculation methods of bearing capacity on normal section and oblique section of are collected; the secondary stress of the component after reinforcement is considered. Calculation method of steel plate lagging strain is given in loading phases.2. For the strengthened reinforced concrete structure beam with steel plate, the model experiments on the normal section and oblique section are finished.The cracking mechanism is studied.The stress-strain curves during loading, the limit bearing capacity and deflection of the strengthened reinforced concrete structure beam with steel plate are gained.3. The shearing calculation of debonding failure is collected; The debonding failure is happened on the surface between structural adhesive and steel plate,not on the surface between the steel plate and structural adhesive.4. According to the experimental specimens, the strengthened reinforced concrete beam with steel plate are analyzed by nonlinear finite element method in critical state.The deformation and bonding cracking in limit bearing capacity are gained.Compared with the experiements, the result has excellent rationality.