The Moment Modification Analysis On Bonded Post-tensioned Prestressed Concrete Continuous Beam

In this paper, 48 post-tensioned prestressed concrete continuous beams are build by finite element software, study the influence of various factors on the moment modification by static analysis. 12 groups of beams are simulated, to analyses the influence of the moment modification of the continuous beams by the prestressing degree, the relative height of compression zone, tension control stress, the strength grade of concrete, the strength grade of steel, etc. In this paper, mainly for the following research and :results:1. Based on concrete constitutive model, the prestressed concrete continuous beam finite element model was established by using ABAQUS software, completed the static load analysis, put forward the correct finite element modeling met.2. The load-displacement curves obtained by static load analysis are compared with those of existing experiment, the two results are with good agreement, so the selection of constitutive model and the the modeling method are proved to be right.3. Changing some parameters of prestressed concrete continuous beam, such as the prestressing degree, the relative height of compression zone, tension control stress, the strength grade of concrete, the strength grade of steel, etc. To study the factors’ influence on the moment modulation of the prestressed concrete continuous beam under static load, and get the influence law of prestressed concrete continuous beam cracking load, ultimate load, the ultimate stress and bending moment.4. Based on the load-displacement curve obtained, the bending moment date, such as bending moment modulation of prestressed concrete continuous beam is obtained by calculating value, by the analysis of the influence of various factors on the moment modulation, and give appropriate suggestion for moment redistribution of the prestressed concrete continuous beam.