Nonlinear Analysis On Ultimate Bearing Capacity Of Bonded Prestressed Concrete Continuous Beam

Through exerting the prestresse to tendon and concrete, displaying tendon and concrete respective characteristic fully, the prestressed concrete can improve the stress performance of structure; enhances the using function; simultaneously,can save the steel and the lumber. Therefore, it's widely applied in each kind of architectural engineering. The condition of ultimate bearing capacity in prestressed concrete continuous beam structure directly relate to structural security, and is one of the most basical mark in evaluating the structural operating performance; No matter structural designing, reinforce and transformation, require an accurate analysis in its ultimate bearing capacity, but the present standard design method cannot satisfy the request obviously, for this reason,the further research is of need.On the basis of consulting massive domestic and foreign researching results, the ultimate bearing capacity in prestressed concrete continuous beam is analysed.At first, on the basis of nonlinear finite element model, method in model building of bonded prestressed concrete continuous beam is discussed; with the example of canonical test beam, the nonlinear finite element model of prestressed concrete continuous beam is established by ANSYS and the entire loading process is taken. The result indicates the models of concrete and tendon are accurate, and the analysis method is reasonable.Then six series altogether forty five 3-span bonded prestressed concrete beams are designed and the nonlinear analysis of entire process with the nonlinear finite element method in model building of bonded prestressed concrete continuous beam improved in paper is made by ANSYS. The effect to ultimate capacity of various parameters, such as Partially Prestressing Rate; area of bonded non-prestressed reinforcement; area of unbonded non-prestressed reinforcement; effective prestress; cylindrically compressive strength of concretes; as well as the loading pattern are studied, and the contrast of resultes among finite calculation,criterion and other calculating methods is made. The analysis result may provide the reference for the design of prestressed concrete continuous beam as well as for formulation of the domestic standard.