Studies On Effects Of Temperature On The Curve Box Girders

With the large number of highways and urban overpass construction and the rapid development of urban construction, the construction of curved girder bridge is also increasing, but due to the mechanical characteristics of curved bridge the particularity-torsion coupling, the original bridge built most of the curve appears varying degrees of damage. Damage caused by the bridge there for many reasons, due to temperature load produced by thermal stress caused by temperature damage is more prominent. Therefore, concrete curved bridge the temperature effect of the attention attracted domestic and foreign scholars. However, due to the force curve bridge the complexity of the existing theory and calculation method is not perfect, making concrete curved box girder bridge design, mostly based on very simple calculation model and method, thus leading to the selection Calculation of temperature field model and obtained by thermal stress have large errors. In this paper, the temperature stress of curved box girder bridge and related issues are analyzed and calculated. Main tasks are:(1) This article discusses the load details of form, and the role of the load; this article introduces the structure of the temperature of the analysis of the theory, the emphasis of the concrete box girder load in the internal and external binding effect of the calculation methods and formulas.(2) This paper describes a curved box girder bridge in the sunshine plane deformation under load and the fixed point principle of the determination and the curved box girder in the sunshine under the effect of temperature load deformation formula.(3) Set up a box of the distant bridges cross-section of a computation models; and bridges to be prescribed by the pattern of a large element; the bridge into the structure of the study on effects of ideas, methods and procedures.(4) Chosen China Highway Code JTG D62-2004, British BS-5400 standard, New Zealand, three kinds three kinds of work as a bridge rules conditions, the use of finite element analysis software running on the stage of the box girders were to bridge a temperature curve effect analysis; analysis and comparison of the box girders bridge on three temperature load pattern the effects of temperature of the cases, cross-section of the distant bridges, and the cases, cross-section of the distant bridges in the load under the stress and deformation characteristics and distribution rule.(5) By comparison we can conclude that:the temperature stress is affecting the structural safety of the bridge box girder damage and one of the important factors.(6) As China's large land area, the climate around the great differences in bridge design and bridge construction during the time necessary depending on the environment to select the appropriate temperature gradient mode.