Mechanical Behaviors Analysis Of The Prestressed Concrete Box Girder Bridge's Negative Moment Area

Prestressed COncrete continuous box girder bridges due to the bounds capacity and flexible construction methods,adaptable,structural stiffness,and anti-seismic capability,good ride comfort,as well as the opening of aesthetic features such as shape,in recent years,a lot of continuous prestressed concrete box-girder bridge has been build.Continuous box girder bridge prestressed statically indeterminate structure as its fulcrum in the vicinity of the region under a negative bending moment,due to the concrete bridge deck to bear a greater tensile stress and cracking,caused by corrosion of steel bars and steel and other serious problems affecting the structure carrying capacity and durability.Therefore,it is necessary to research stress distribution of the negative bending,there will to ensure the superiority of continuous box girder bridge into full play.The first,This article introduced the development of continuous prestressed concrete box-girder bridge and current situation of continuous prestressed concrete box-girder bridge structural features.The second it introduced the material non-linearity,geometric non-linear basic theory,and nonlinear finite element analysis model of the materials used in the constitutive relation.Qiqihar Nenjiang briefly Bridge as the background information of static load test in accordance with the actual size,to use the finite element theory and the finite element analysis software ANSYS to establish variable cross-section of prestressed concrete box-girder bridge for the nonlinear finite element analysis model and its box-tensioned tendons and the condition imposed by the external loads to simulate the entire process of analysis.Test data and finite element model calculations of data were analyzed,the results are in good agreement,verify the non-linear finite element model of the correctness and finite element simulation method.The use of finite element model for further analysis of prestressed concrete box beam negative moment zone mechanical properties,to draw the interaction relations of the stress and strain intribution on the negative moment area,web deflection and bearing reaction.