Cold-formed thin-walled steel web combined PC box girder

A technology of cold-formed thin-walled steel and cold-formed steel, which is applied to bridges, bridge parts, bridge materials, etc., can solve the problems of easy cracking of the web, complex construction, and self-heavyness, etc., to achieve a slim structure and improve the bending resistance of the section ability and torsion resistance, the effect of light weight
CN112982142AActive Publication Date: 2021-06-18BEIJING UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
BEIJING UNIV OF TECH
Publication Date
2021-06-18

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Abstract

The invention discloses a cold-formed thin-walled steel web combined PC box girder, comprising an upper flange, a lower flange and two truss type cold-formed steel combined webs. According to the invention, the web and the lower flange are both formed by combining the cold-formed thin-walled steel, the dead weight of the girder body is reduced, and span breakthrough is achieved; the web and the lower flange are in a truss form, so the overall stability of the structure can be improved, and the problem of poor local stability of the cold-formed thin-walled steel is solved; the webs are made of the cold-formed thin-walled steel, so the problem that webs of common prestressed concrete beam bridges are prone to cracking is fundamentally solved; and factory production of the cold-formed thin-walled steel and a prefabricated laminated slab can effectively accelerate the construction progress and improve the quality of components. The box girder of the invention has the advantages of being high in assembly speed, high in standardization degree, low in manufacturing cost, light in self-weight and excellent in bending resistance and crack resistance, can effectively solve the problems that a traditional concrete box girder component is complex in construction, high in manufacturing cost, large in self-weight, prone to web cracking and the like, and is suitable for bridge structure girders or main and secondary beams and other components of a building structure.
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Description

technical field

[0001] The invention relates to a cold-formed thin-walled steel web combined PC box girder with the advantages of light weight, high degree of standardization, good crack resistance and low cost, which belongs to the field of bridge engineering structures and can also be used in the technical field of building structures. Background technique

[0002] Prestressed concrete bridge is one of the common bridge types in our country. However, with its wide application, a series of problems in the construction and operation of prestressed concrete bridges have gradually emerged. During the construction stage, this kind of bridge structure has problems such as heavy beam body, difficult transportation, many wet operations on site, and difficulty in guaranteeing the quality of concealed construction of prestressed pipelines. The main problems in the operation stage are: easy cracking of the web, large shrinkage and creep, obvious loss of prestress, mid- and long-term...

Claims

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