Temperature Gradient Analysis Of Small-radius Curved Bridge

China is a large country, has a wide variety of climatic zones from theequatorial climate to the complex terrain of alpine belt and from the tropical rainforests to the droughty desert. the temperature field of the bridge structure vary indifferent regions. But the temperature field in code(JTG D60,2004) is only relevantfor structural form. Therefore, it can not be good reflect the temperature changes ofthe environment of the bridge, and it is highly necessary to study of the temperatureeffects on small-radius curved bridge effected by gradient temperature load.Concrete structures in a natural environment, affected by the ambienttemperature of the solar radiation and atmospheric climate change, cause thenonlinear temperature distribution inner the structure of the bridge, resulting inthermal stress and temperature displacement. Statistics and studies have shown that,the diseases of the concrete structures, especially the small-radius curve of thebridge structure such as bearing separation, warping and beam roof in the curve ofbeam longitudinal cracks, all relate to temperature effect.This paper using the finite element method based on the structure of spaceentities and the ABAQUS program to establish a numerical model of thesmall-radius curve bridge. Take a certain degree of secondary development on theABAQUS program, Making the calculation of the gradient temperature field aspossible. The main work in paper is analysis on the beam torsional deformation,radial displacement and stress in different gradient temperature load, as well asexploring influence of curve radius. Specific research work is as follows: Thispaper firstly summaries the present research conditions of the curved bridge and theCalculation method of temperature action to provide theoretical support for thelatter part of the structural analysis;Based on the design of a certain curved beambridge, study the method of building finite element model. and conduct fieldinvestigations to determine the development of geometry, material properties andboundary conditions of the modeling initial conditions. Collect relative informationon the temperature effect, determine the temperature effect of the load parametersand loading methods; Analyze the influence of Different gradient temperature loadon mechanical properties of curved beam bridge; Then, the curve radius was changed to analyze mechanical properties of curved beam bridge of different radius,so the influence law of curve radius on the bridge structure was drew; Based on thegetting know the common diseases of curved beam bridge and the results of presentanalysis, and puts forward reasonable prevention measures. Therefore, diseaseoccurrences of bridges of this kind may be avoided or reduced.By the analysis of the temperature effect on the curve of the bridge structure,the temperature effect analysis of curved girder bridges is explored, and designmethod favorable to the structure is proposed in the paper. Therefore, diseaseoccurrences of bridges of this kind may be avoided or reduced.