A super-wide truss bridge structure system and its design method

Abstract

This application relates to a super-wide truss bridge structure system, which includes a plurality of reducing structures, which are distributed at intervals along the longitudinal direction of the bridge at the bottom of the bridge deck system, and the reducing structures include: beam columns, which are installed on the bridge deck system on the corresponding crossbeam in the middle, and extend vertically downward; two stay cables, which are arranged on both sides of the crossbeam column upward on the crossbridge; one end of the stay cable is connected with the crossbeam column, and the other end It is connected with the lower chord of the corresponding side truss, so that the two stay cables act on the deck system and the truss with the designed tension. By reducing the tension of the structure, the out-of-plane bending moment of the beam and truss 1 is offset by the dead load. After the offset, the vertical displacement of the beam is zero, and through the finite element analysis, the appropriate size of the reduction structure is designed according to the design steps. The cross beam solves the problems of the excessively large out-of-plane bending moment of the ultra-wide steel truss girder web, which makes it difficult to design and the structural economy is poor.

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...

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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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