Two-dimention Temperature Gradient And Affection Analysis On Concrete Curve Continous Box-girder Bridge

With the development of modern urban transport, and in city curved box-girder bridgehad become an important bridge in three-dimensional transport, the study of its structure andmechanical behavior had also been highly focus in bridge engineering, in which thetemperature affection of this type bridge always was hot item. When the force acts on thecurved bridge it showed the characteristic of the bending-torsional coupling, and alwaysoccured the engineering accident because of this character, the temperature effect was one ofthe main factors after the analyses that can not be ignored, it was necessary for thetemperature effect of concrete continuous curved box-girder bridges for further research.The background of the paper was an instance of continuous curved box-girder bridgeoverpass engineering, combined with heat transfer, and solar radiation relevant theoreticalknowledge, analysis of the section of curved box-girder temperature field distribution usingthe finite element method, after comparing measured values obtained similar laws andtheoretical calculations, and meeting the accuracy requirements of the project. Furthermore,through the analysis of the temperature effect on other national design specification,combined with our existing specification, fitting out the two-dimensional temperaturegradient mode of the engineering of this paper, to compare and analysis the affection ofone-dimensional and two-dimensional temperature gradient temperature gradient ondeformation and stress in continuous curved box-girder bridge. In the end, create differentmodels of radius of curvature and prestressing force, etc, and analyzing the affection of thecontinuous curved box-girder bridge temperature.The results showed that continuous curved concrete box cross-section temperaturedistribution appeared the vertical and the transverse temperature gradient, the roof and floorthere was an obvious vertical temperature gradient, local transverse temperature gradientalong the box beam sternum thickness and by the sun’s radiation angle of impact. Intwo-dimensional temperature mode of this paper, when the outside webs increase temperature,the radial displacement of continuous curved bridge was increasing under the combined effect of increasing temperature and torsion-coupling effects, but the deformation decreases whenthe inside webs increased temperature; in addition, box beam web tension as a whole, tensilestress differences within the outer edge of the web than a one-dimensional temperaturegradient effect when larger and larger multi-compartment box-section tensile stress in the web;the radial deformation of box beam due to temperature effects, along with the increase withthe increase of the central angle of curved bridge in the same span; the prestress caneffectively reduced the temperature adverse effect of bend bridge.