Wide-purlin bridge floor system structure with horizontal K support

Abstract

The invention relates to a wide-purlin bridge floor system structure with a horizontal K support, comprising a main purlin node, a main purlin chord member, a steel bridge panel, a longitudinal rib and main cross beams, wherein the longitudinal rib is arranged on the lower bottom surface of the steel bridge panel; the main cross beams are arranged below the steel bridge panel; two ends of each main cross beam are connected with the main purlin node; a plurality of secondary cross beams are arranged between the two main cross beams; two sides of the steel bridge panel are provided with side longitudinal beams; two ends of the side longitudinal beams are connected with the main cross beams; two ends of the secondary cross beam are connected with the side longitudinal beams; and the main purlin node is connected with the side longitudinal beams on two sides of the end part of the main cross beams by a horizontal K support. Longitudinal loads, such as bridge floor braking force, main purlin lower-chord axial force and the like borne by the bridge floor and the like, are transferred to the main purlin node by a longitudinal force transferring system comprising the bridge panel, the side longitudinal beams and the horizontal K support. The wide-purlin bridge floor system structure has excellent power performance. The traditional brake support is replaced, steel materials are saved, and the wide-purlin bridge floor system structure adapts to the requirement of high speed car running and can be used for the structural design of the bridge floor of longspan and super-longspan steel trussed-beam bridges.

Description

technical field [0001] The invention relates to the technical field of bridge engineering steel truss bridges, in particular to a bridge deck structure with horizontal K-brace wide truss bridges. Background technique [0002] Deck system design is the key to the design of steel truss bridges, which is directly related to the choice of truss type and the mechanical performance of the structure. Steel truss bridge decks mainly have the following forms: exposed deck, concrete deck, orthotropic steel deck. [0003] Open bridge deck: Most of the steel truss girder railway bridges built in my country in the early days have open decks with vertical and horizontal beams, such as Wuhan Yangtze River Bridge and Nanjing Yangtze River Bridge. In the exposed bridge deck structure, bridge deck beams are set at the main truss nodes, and the bridge deck longitudinal beams are connected to the beams, and the sleepers (or rails through fasteners) are directly fixed on the longitudinal beams....

AI Technical Summary

Problems solved by technology

The orthotropic steel deck has the defect of unreasonable force transmission, so that there are the following problems: (1) Due to the difference between the thickness of the top plate of the lower chord and the thickness of the deck steel plate and the inconsistency of vertical deformation, the steel deck and the main chord The connection of the top surface of the bar becomes the weak point of stress; (2) when the bridge deck is wide, due to the shear lag effect of the bridge deck, the problem of the large out-of-plane bending distance of the bridge deck beam cannot be fundamentally solved; (3 ) Since the vertical load of the internode bridge deck is mainly distributed on the beam in the form of concentrated load through the longitudinal beam, it will inevitably cause a large vertical bending moment of the beam and increase the cross-sectional size of the beam; (4) the longitudinal horizontal load of the bridge deck passes through the steel The weld between the bridge deck and the top plate of the main truss chord is transmitted to the main truss, and the weld needs to be welded on site. The weld is long and the heat effect accumulates obviously, so it is difficult to guarantee the welding quality; (5) due to the vertical The load is distributed on the main truss chord in the form of concentrated load through the secondary beam. The lower chord not only bears the axial load generated by the main truss system, but also bears the vertical bending distance generated by the secondary beam, which makes the force of the lower chord complex. Reduced load carrying capacity of the bottom chord

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