Shear hinge structure and its construction method that can solve the temperature effect of steel box girder cable-stayed bridge

Abstract

The invention relates to a shear hinge structure capable of eliminating the temperature effect of a steel box girder cable stayed bridge and a construction method of the shear hinge structure capable of eliminating the temperature effect of the steel box girder cable stayed bridge. Reserved structural seams are formed in a midspan of two tower steel box girders of the cable stayed bridge and the steel box girder at the reserved structural seam end and the end, provided a small steel box girder in an embedded mode, of a shear hinge are fixed in a welded mode or in a bolting mode; an inserting groove is formed in the steel box girder arranged at the other end of the cable stayed bridge, a support special for the shear hinge is installed in the inserting groove, and a shear hinge limiting device is arranged outside the inserting groove. The construction method comprises the steps that the best position of the shear hinge structure is selected; according to the designed load, the stroke delta L needing to be set of the shear hinge is calculated; the reserved structural seams are arranged according to the stroke, the steel box girder at the reserved structural seam end is connected with the end provided with the small steel box girder in the embedded mode; the inserting groove at the other end is provided with the support special for the shear hinge and the support special for the shear hinge is capable of sliding or rotating so that the shear hinge limiting device can be installed. According to the shear hinge structure capable of eliminating the temperature effect of the steel box girder cable stayed bridge and the construction method, the temperature span of the steel girders can be shortened and the stroke of the ends of the steel box girders is reduced; under the temperature load effect, change of the cable force of staying cables at the two sides of the main tower is basically identical under the temperature load effect, and the bending moment of the main tower is remarkably reduced.

Description

technical field [0001] The invention relates to a shear hinge structure capable of solving the temperature effect of a steel box girder cable-stayed bridge and a construction method thereof. Background technique [0002] Steel box girder cable-stayed bridges are widely used in long-span cable-stayed bridges because of their low weight and convenient construction. But in the steel box girder cable-stayed bridge, the effect of temperature load is very obvious. According to the analysis, the components of the cable-stayed bridge are highly sensitive to the temperature load. The research shows that the temperature difference of the system and the temperature difference of the cable beam will have a great influence on the bending moment of the main tower, the displacement of the tower top, and the displacement of the beam end. [0003] For cable-stayed bridges with steel box girders, due to the large linear expansion coefficient of the steel, when the temperature span of the st...

AI Technical Summary

Problems solved by technology

The change of cable force is not equal on the left and right sides of the tower, which causes the cables on both sides of the main tower of the cable-stayed bridge to increase on one side and decrease on the other side under the action of temperature force, resulting in a large bending at the root of the bridge tower. moment, increasing the design difficulty of the main tower and foundation

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