Force Performance Research Of Long-span Prestressed Steel Reinforced Concrete Composite Beam

The prestressed steel reinforced concrete composite beam is a newly developed assembled component that is on the basis of the prestressed concrete structures and the steel structures. With the popularity of the modern long-span construction structures, the development of long-span prestressed steel reinforced concrete composite beam is becoming more and more widely used in large structural bay, large column grid and multifunction.The prestressed steel reinforced concrete composite beam has the performance of light weight, large stiffness, great crack resistance and great seismic behavior which can effectively decrease the sectional measurement, increase the building utilization area and meets the demands of aesthetic structure, therefore it is specially applicable to build the long-span bridges, workshops, stations, underground buildings, gymnasium and high rise buildings. However, scholars only made elementary attempt and few related experimental research over the newly-burgeoning long-span prestressed concrete beam. In fact there's no theoretical principle and analytical designing method for conducting engineering applications and no corresponding code and principle to consult. Which has limit its widely use in practical project.This thesis is about to take the large general-purpose finite computer program ANSYS into building finite model on the basis of finite theory, which analyze the non-linear finite deformation development during the whole stress progress and the stress distribution of the concrete and steel for the prestressed steel reinforced concrete composite beam.On the basis of existing experimental research, this thesis takes finite software ANSYS into using finite simulating contrast analysis on the short-span beam which shows that the simulation results fits well with the experimental value. The analysis modeling progress of the finite model can preferably reflect the real stress condition of the beam, which provides reference for the further research of long-span prestressed steel reinforced concrete composite beam.In order to make further research of stress performance for long-span prestressed steel reinforced concrete composite beam, the author made design research about the parameters such as the ratio of longitudinal stress reinforcement, steel proportion, the concrete strength, the span-depth ratio, the degree of prestress and so on, that dramatically affect its performance after analyzing the structure stress progress. This thesis made analysis about bending moment-deflection under different longitudinal stress steel ratio of the long-span prestressed steel reinforced concrete composite beam and discuss the structure deformation law in different span-depth condition. And in the thesis, a reasonable range for the long-span prestressed steel reinforced concrete composite beam is advised and the conclusion of the thesis provide some beneficial advices for the designing of long-span prestressed steel reinforced concrete composite beam flexural structures.