Vertical temperature gradient effect analysis method for large-span prestressed concrete box girder bridge

Abstract

The invention provides a vertical temperature gradient effect analysis method for a large-span prestressed concrete box girder bridge. The method comprises the following steps that a concrete box girder bridge is divided into a plurality of concrete box girder sections in the bridge axis direction, the ith concrete box girder section is divided into a top plate-web plate area and a bottom plate area, and vertical temperature distribution curves of the top plate-web plate area and the bottom plate area are obtained respectively; vertical temperature distribution curves of the top plate-web plate area and the bottom plate area are analyzed and fitted to obtain a vertical temperature distribution mode of the ith concrete box girder section; the change rule of the parameter value is analyzed in the vertical temperature distribution mode of the ith concrete box girder section along the axial direction of the bridge; and temperature gradient effect analysis is performed on the large-span prestressed concrete box girder bridge. According to the method, the influence of the change of the section size in the bridge axis direction is effectively considered, and a basis is provided for structural calculation analysis and construction control analysis of the large-span prestressed concrete box girder bridge.

Description

technical field [0001] The invention relates to the fields of bridge structure design, structure analysis and construction control, in particular to a method for analyzing the vertical temperature gradient effect of a long-span prestressed concrete box girder bridge. Background technique [0002] Long-span prestressed concrete box girder bridges have been widely used in bridge construction in various countries because of their good mechanical performance and beautiful appearance. However, due to the poor thermal conductivity of concrete, under the action of environmental factors such as solar radiation, atmospheric temperature, and wind speed, a nonlinear temperature distribution will occur inside the bridge structure, resulting in an obvious temperature effect. Stresses and deformations caused by temperature effects are comparable to the effects of dead and live loads. Therefore, it is necessary to calculate the temperature gradient effect of long-span prestressed concrete...

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Problems solved by technology

Section size is an important factor affecting the temperature gradient distribution of concrete box girders. Therefore, the vertical temperature gradient distribution of long-span concrete box girder bridges also changes along the bridge axis, and the one-dimensional temperature gradient curve distribution model stipulated in the code cannot be applied Long-span prestressed concrete box girder bridge

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