Method for analyzing temperature gradient effect of flat steel box girder of long-span steel bridge

Abstract

The invention discloses a method for analyzing a temperature gradient effect of a flat steel box girder of a long-span steel bridge. The structure of a steel box girder is a hexagonal flat steel box girder. The method comprises the following steps of: analyzing the sectional temperature gradient distribution of the steel box girder; acquiring a gradient curve of piecewise linear change of the maximum temperature along a vertical direction; and analyzing influence of temperature on stress and deformation of the steel box girder. The method is applicable to orthotropic flat steel box girders with or without a footway flange plate. The sectional temperature gradient distribution, the vertical gradient curve and a formula, which are acquired according to the method, are accordant with the distribution of sectional temperatures of the structure of the flat steel box girder at a sunlight temperature difference. By applied temperature gradient distribution which is acquired according to the method, the influence of temperature on stress and deformation can be analyzed. The research of the method is aided financially by national science and technology supporting planning projects 2009BAG15B03.

Description

technical field [0001] The invention belongs to the field of bridge structure design, structure analysis and construction control in bridge engineering, and particularly relates to the temperature stress analysis in the process of optimizing the structure design of a flat steel box girder of a long-span steel bridge. Gradient effect analysis method. Background technique [0002] In the field of bridge engineering, the streamlined orthotropic flat steel box girder structure has the advantages of low beam height, light weight, high section torsional rigidity, good wind resistance stability, and convenient manufacturing and construction. Orthotropic flat steel box girders are widely used in long-span bridges. However, steel box girders have good thermal conductivity and are sensitive to changes in ambient temperature. During the construction process and the operation process after the bridge is completed, the effect of temperature will not only cause changes in the alignment ...

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Problems solved by technology

[0004] Since the cross-sectional structure of the orthotropic flat steel box girder of long-span bridges is completely different from that of domestic and foreign codes, and steel box girders and concrete box girders are very different in many aspects such as materials, structures, and mechanical behaviors, the steel bar The temperature distribution model obtained by studying the temperature of concrete box girders cannot be applied to flat steel box girders of long-span bridges

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