Lower chord opening beam type corrugated steel web combination beam

Abstract

The invention relates to a bottom chord open truss type corrugated steel web composite beam, belonging to a bridge support member. The bottom chord open truss type corrugated steel web composite beam is composed of a top-wing concrete slab, a corrugated steel web and a bottom chord open truss type rectangular steel pipe concrete. Compared with the steel truss type web composite cross section, the bottom chord open truss type corrugated steel web composite beam adopts the corrugated steel web with high shear strength to replace the steel web bar, and has high shear bearing force. The open truss type bottom chord is composed of two parallel rectangular steel pipes and concretes casted in the steel pipes, horizontal supports between rectangular steel pipes, and inclined supports. the bottom chord adopts the steel pipe concrete member to overcome the problem that the bottom flange concrete of the traditional corrugated steel web box beam and steel truss type web composite cross section needs to set up scaffold, support framework and concrete casting so as to have large work load, moreover the bottom chord open truss type corrugated steel web composite beam can improve crack resistance of structure effectively and avoid crack from being exposed, so that structural endurance can be obviously improved. The bottom chord is an open type structure with support connection, and has the advantages of simple structure, convenient and rapid construction.

Description

technical field [0001] The invention relates to a lower chord open truss type corrugated steel web composite beam applicable to railway bridges and highway bridges, belonging to the technical field of bridge structures. Background technique [0002] The traditional steel truss web composite section is developed from the concrete box section, which uses steel truss instead of the concrete web of the box section, thus forming a concrete slab consisting of upper flange, steel truss and lower flange concrete Structural system where the plates are jointly stressed, such as figure 1 shown. When steel trusses are used for the webs of this type of structure, in order to avoid buckling of the steel trusses under compression, it is often necessary to pour concrete into the compression trusses, and sometimes it is necessary to apply prestress to the tension chords in order to reduce the level of tensile stress. A lot of work. At the same time, the composite section of the steel trus...

AI Technical Summary

Problems solved by technology

At the same time, the composite section of the steel truss web and the traditional corrugated steel web box girder (see figure 2 ) similarly, the pouring of the lower flange concrete slab requires on-site erection of scaffolding and supporting formwork, and there are problems such as on-site workload and construction difficulty

On the other hand, the concrete floor is prone to cracking under the action of positive bending moment, and the cracks will reduce the bearing capacity, stiffness and durability of the structure

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