Lower edge open truss style corrugated steel web combination beam

Abstract

A truss-type corrugated steel web composite beam with an open bottom chord belongs to a bridge support member. The bottom chord opened and truss-type corrugated steel web composite beam comprises an upper wing edge concrete slab, a corrugated steel web and a bottom chord opened truss-type rectanglar steel tube concrete member. Compared with steel truss-type web composite corss section, the invention adopts the corrugated steel web with rather high shear strength to replace a steel web member, so as to guarantee quite high shear bearing capacity. The opened truss-type bottom chord is composed of two parallel-arranged rectanglar steel tubes arranged in parallel and internally cast concrete, as well as horizontal braces and batter braces between the rectanglar steel tubes. Moreover, the bottom chord adopts the steel tube concrete member to overcome the problem of rather high work volume that, in traditional composite cross section of corrugated steel web box beams and steel truss-type webs, such execution measures as scaffolding, formwork-support, concrete casting and etc. should be taken for lower wing edge concrete slabs. Meanwhie, the invention can effectively improve structure crack resistance, avoid crackage exposure and etc, and considerably increase structure durability. The bottom chord is a brace-connected open-type structure with advantages of simple structure and fast, smooth and convenient execution.

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 The structural system of the joint stress of the plates is shown in Figure 1. 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 truss we...

AI Technical Summary

Problems solved by technology

At the same time, the combined section of the steel truss web is similar to that of the traditional corrugated steel web box girder (see Figure 2). The pouring of the lower flange concrete slab requires on-site erection of scaffolding and support formwork, which involves on-site workload and construction difficulties. major issues

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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