Ultra-wide truss bridge structure system and design method thereof

Abstract

The invention relates to an ultra-wide truss bridge structure system which comprises a plurality of reduction structures which are distributed at the bottom of a bridge deck system at intervals in the longitudinal bridge direction; each reduction structure comprises a cross beam stand column which is installed on a corresponding cross beam in the bridge deck system and vertically extends downwards; two inhaul cables which are arranged on the two sides of the cross beam stand column in the upward direction of the cross bridge respectively, wherein one end of each inhaul cable is connected with the corresponding cross beam stand column, and the other end of each inhaul cable is connected with a lower chord of the corresponding side trussed beam, so that the two inhaul cables act on a bridge deck system and the trussed beams with designed tension. The out-of-plane bending moments of the cross beam and the trussed beam 1 are counteracted under the dead load action through the tension of the reduction structure, the vertical displacement of the cross beam is zero after counteracting, and the reduction structure and the cross beam with proper sizes are designed according to the design steps through finite element analysis; therefore, the problems that the out-of-plane bending moment of the web member of the ultra-wide steel truss girder is too large, design is difficult, and the structural economy is poor are solved.

Description

technical field [0001] The application relates to the field of bridge construction, in particular to an ultra-wide truss bridge structure system and a design method thereof. Background technique [0002] With the rapid development of traffic volume, the combination of ultra-multi-lane and multi-functional passages has become a new trend in the development of the industry. Among them, for long-span and ultra-wide double-deck bridges, steel truss girders are often used as the main girder, and two steel truss girders are arranged along the longitudinal direction of the bridge. The upper chord is connected, the lower beam is connected with the lower chord, and the bridge deck is set on the two beams as the bridge deck system to form a large-span and ultra-wide double-layer bridge; due to the wide bridge deck and the large span of the bridge deck system, the bridge deck system The high height and large cross-section of the required beams lead to a straight-up increase in the amo...

AI Technical Summary

Problems solved by technology

[0006] The embodiment of the present application provides a super-wide truss bridge structure system and its design method to solve the problem in the related art that the stiffness of the bridge and the stiffness of the web members in the steel truss girder increase, and the out-of-plane bending moment it bears will also increase accordingly

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