Steel pipe stiffened web steel-concrete composite box girder

Abstract

The invention discloses a steel pipe stiffening web steel-concrete composite box girder. The steel pipe stiffened web steel-concrete composite box girder comprises a concrete top plate, steel pipe stiffening webs, a steel bottom plate, cross-bracing structures and an upper flange plate, the steel bottom plate is welded to the lower edge of the steel pipe stiffening webs on both sides, the upper edge of the steel pipe stiffening webs is welded to the upper flange plate, and the steel pipe stiffening webs, the steel bottom plate and the upper flange plate are welded into a groove-type steel structure; the concrete top plate is connected to the top part of the upper flange plate through a connecting part, the steel pipe stiffening webs, the steel bottom plate, the upper flange plate and the concrete top plate form a box girder structure, and a plurality of cross-bracing structures are arranged in a support point of the box girder and the middle of the box girder. According to the steel pipe stiffening web steel-concrete composite box girder, the longitudinal stiffness of steel webs and the upper flange plate can be reduced, the prestressing efficiency is improved, meanwhile the deformation coordination ability of the concrete top plate and the steel structure is coordinated, secondary internal force generated by shringkage and creep of concrete and temperature are reduced.

Description

technical field [0001] The invention relates to the technical field of bridge engineering, in particular to a steel-concrete composite box girder with stiffened webs of steel pipes. Background technique [0002] Channel steel box composite beam, also known as open steel box composite beam, is composed of three parts: reinforced concrete roof, flat steel bottom plate and flat steel web, such as figure 1 As shown, its advantages are high torsional and bending rigidity, light weight, and good seismic performance. During construction, the channel-shaped steel box can be used to assume first and then carry out bridge deck construction, which is widely used in engineering. However, there are also many problems in the channel steel box composite girder: [0003] 1. The longitudinal rigidity of the flat steel web is large. When the longitudinal prestress of the concrete roof is stretched, the flat steel web will lose the longitudinal prestress that should have been applied to the c...

AI Technical Summary

Problems solved by technology

[0003] 1. The longitudinal rigidity of the flat steel web is large. When the longitudinal prestress of the concrete roof is stretched, the flat steel web will lose the longitudinal prestress that should be applied to the concrete roof. The prestressing efficiency is low and the material is wasted

[0004] 2. In order to prevent the buckling of the steel plate, a large number of vertical and horizontal stiffeners must be welded on the flat steel web. There are many welds and the processing is complicated

[0005] 3. When the channel-shaped steel box is erected first, because it is an open section, it is prone to overall or partial instability. It is necessary to set up a lot of temporary supporting steel members. After the concrete roof is installed, the temporary members will be removed. There are many construction procedures. During the construction process prone to safety accidents

[0006] 4. The steel web of the channel-shaped steel box is generally connected to the concrete roof by the connector with the upper flange plate. Due to the influence of temperature, shrinkage and creep, the concrete roof is inconsistent with the deformation of the steel structure, and secondary internal forces are generated, resulting in steel-concrete The concrete at the junction is prone to cracking, which affects the safety and durability of the structure

Images