The Performance And Design Method Study Of Prestressed Concrete Beam Under Impact Load Function

Comparing with the ordinary reinforced concrete, the prestressed concrete has obvious superiority. Currently, people do not realize the capability of resisting concussion to the pre-stressed concrete structure very well, worrying about the low ductility of the pre-stressed concrete structure, that brittle failure will occur under the strong impulsive load. Based on the analysis of the application and development to the prestressed concrete in and out of abroad, assumption of using the prestressed concrete in large-span projects is put forward .According to this assumption, testing researches with the drop hammers were done to three unbonded prestressed concrete beams at the condition of bareness as well as under the soil. Numerical simulation analysis to the experimentation with the implicit and explicit analysis method of ANSYS/LS-DYNA was done, compared the numerical simulation result with the test result we found that the two results are quite consistent, the numerical simulation result is good supplement to the test. Mean while, systemic researches of the academic analysis and design method to the pre-stressed concrete structure under the impulsive load were done, proposing the anti-dynamic design method of the structure.According to the results of the study, the prestressed concrete structure can also be designed with well ductibility as long as appropriate design was done, and it can fully withstand the impact load. So if the prestressed concrete structure is applied in the large-span underground project, it can meet the application requirements as well as cut down the cost of the project.