Mechanical Property Study Of T-head Unbonded Prestressed Steel Reinforced Concrete Beam

Steel reinforced concrete (SRC) structure has both merits of steel struction and concrete structure, it can use the ascendant tension capability of steel struction and compressive capability of concrete struction adequately, and makes the composition material get the most rational use. The primary advantage of prepress constructure is to improve structural crack resistivity, economize material and reduce cost. These two constructures get widely application in every field of cicil constructure in both here and abroad.SRC beam 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. These disadvantages make it can't be used ideally and limit its spread in engineering. PSRC structure can solve these disadvantages.Recently, many experts and scholars start to study the capability of prepress composite beam, but the study about T-head unbonded prepressed steel reinforced concrete beam is very infrequent, the dependent report is not seen yet.In this paper, the mechanical property of T-head unbonded prepressed steel reinforced concrete beam are studied by the methods of theory analysis and numerical evaluation, the main achievements of this thesis are as follows:The increment formulas of unbonded prepressed reinforcing steel disposed with straight, polygonal and curved line are given; The mechanical property of T-head unbonded prepressed steel reinforced concrete simple-supported beam is analyzed minutely, the stress calculating formulas of each section in different loading stages prestressed with straight, polygonal and curved line are given, and it forms calculating formulas of cross-sectional stress, crack resistivity bearing strength, elasticity bending strength and collapse bending strength; The calculating method of cross-sectional stress and calculating formulas of crack resistivity bearing strength, elasticity bending strength and collapse bending strength in the different loading stages of steel reinforced concrete continuous beam are given; The nonlinear analysis program of steel reinforced concrete beams is developed. The curve of the bending moment-curvature and load-deformation are received.