Nonlinear Finite Element Stress Analysis Of Prestressed Steel Reinforced Concrete Frame Beam

Prestressed steel reinforced concrete structure in the steel reinforced concrete structure prestressed tendon layout and tension of a certain number of a new type of composite structure. The combined structure has multiple advantages of steel structure, concrete structures and prestressed structure, improve the bearing capacity of concrete structures using steel concrete technology, using technology to improve the performance of the prestressed steel reinforced concrete structure under serviceability limit states (such as crack control etc.), high rigidity, high bearing capacity, small deformation, the total the crack is small, small size of section, good seismic performance, the beam is suitable for large span and section of the beam structure has higher requirements, such as bridges, docks, stations, underground buildings, large span buildings, theaters and other high-rise buildings. Its excellent mechanical properties, good economic benefit is gradually known and explore, at present, at home and abroad on the prestressed steel concrete composite beam research mainly concentrated in large span beam, single span and multi span continuous beam, however, in practical engineering, the frame beam appears more, so this type of prestressed steel reinforced concrete frame beam stress were studied. The main contents as below:First, based on Experimental Study on existing literature, the finite element model is established using a large general finite element software ANSYS, the deformation, prestressed steel reinforced concrete frame beam in the whole loading process of concrete and steel should be nonlinear finite element analysis of the stress distribution, and compared with the literature results, show that the analysis result and the experimental value with good kiss. Analysis shows that the finite element model of all in the process of modeling parameters and assumptions adopted can reflect the real stress of beam, and provides reference for further study.Second, for the further study of behaviors of prestressed steel reinforced concrete beams, mechanical process components, this paper analyses, on the basis of the parameters affecting the behavior influenced their, such as plain bearing steel reinforcement ratio, strength of concrete, steel reinforced with steel, prestressed tendon control parameters of stress factors. Results showed that the ordinary steel reinforcement ratio the greater the higher the ultimate bearing capacity of beam, but is less deformation and ductility; Higher concrete strength, the higher the ultimate bearing capacity of the beam, while deformation and ductility as possible;-Beam ratio of steel, the greater, the higher the ultimate bearing capacity of the beam, deformation and ductility as possible; Increased control of prestressed tendon stresses, beam crack load increases, cracks appeared to be stalled, without significantly affecting the ultimate bearing capacity of beam, deformation and ductility performance degradation.In this paper, from different angles in-depth analysis of the mechanical performance of the prestressed steel reinforced concrete frame beam, the influence of different factors on the performance of the stress component. The conclusions extend to the prestressed steel reinforced concrete frame beams of a certain significance, has the certain reference value to the further research.