Mechanical Property Study Of Open Spandrel Bonded Prestressed Steel Reinforced Concrete Beam

Prestressed steel reinforced concrete structure is a new structure type, including the same features as the SRC:large bearing capacity, good rigidity, good seismic behavior and so on. It is divided into two kinds:solid-web and open-spandrel, and It combines the merits of the steel structure and the concrete structure. For the flexural member, the SRC structure still has some disadvantages, such as large distortion, tension concrete plate in negative bending moment section of statically indeterminable structure like continuous beam and so on. PSRC structure overcomes these defects, decreases or prevents cracks of the composite girder in dead loads and live loads, increases rigidity of the composite girder, reduces deflections of the composite girder and prevents the Corrosion of the steel bar. It fully exerts the superiority of the steel structure, constrained core concrete, prestress technology and spatial structure. So the study of the Structure Mechanism of the prestressed SRS has important significance for the application and popularization of this type of structure.Recently, many experts and scholars have worked on the mechanical analysis of prestressed composite girders, but there are fewer studies on this type of bonded prestressed SRC composite girders. The analysis of this thesis can provide some technical supporting in the engineering design and applying.In this paper, the mechanical properties of bonded prepressed steel reinforced concrete beam are studied by the methods of theory analysis and numerical evaluation. For the simply supported bonded PSRC, formulas for calculating stress of the section in different loading stage of the beam with linear bar-arrangement; the calculation formula of anti-crack capacity, elastic flexural bearing capacity and ultimate flexural bearing capacity is established. For the continuous bonded PSRC, formulas for calculating stress of the section in different loading stage of the beam with linear bar-arrangement; the calculation formula of anti-crack capacity, elastic flexural bearing capacity and ultimate flexural bearing capacity is established. The nonlinear analysis program of bonded prepressed steel reinforced concrete beams is developed. The curve of the bending moment-curvature and load-deformation are received, and the influencing factors are discussed.