Method for anti-cracking in hogging moment area of steel-concrete combined beam

A technology of negative bending moment area and concrete, which is applied in the direction of bridges, bridge parts, bridge construction, etc., can solve the problems of structural durability impact, concrete cracking can not be prevented, and achieve the effect of controlling cracking, increasing construction, and convenient construction

Inactive Publication Date: 2007-06-20
TSINGHUA UNIV
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Problems solved by technology

The high reinforcement in the concrete in the negative moment area of ​​the continuous composite beam cannot prevent the cracking of the concrete, and still has a certain impact on the durability of the structure

Method used

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  • Method for anti-cracking in hogging moment area of steel-concrete combined beam

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Embodiment Construction

[0021] The invention provides a method for anti-cracking in the negative moment zone of a steel-concrete continuous composite beam. The so-called positive bending moment area is the middle part of the bridge that bends downward when it is under compression between the two piers 1; The steel girders 3 on both sides of the bridge are pushed upward by the pier 1, and this part is called the negative bending moment area. The concrete on the steel beams 3 on both sides of the bridge pier 1 in the negative bending moment zone is the concrete wing plate in the negative bending moment zone. When the concrete wing in the negative bending moment area is bent upward, the concrete wing is easy to crack. The method to overcome cracking is to pour concrete in the positive moment area and negative moment area of ​​the steel-concrete continuous composite beam in two steps, and at the same time arrange the preloading load or ground anchor loading method in the positive moment area to facilita...

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Abstract

The present invention discloses anti-cracking method in negative hogging moment area of combined steel-concrete beam, and belongs to the field of support beam structure in road, bridge and building. The anti-cracking method includes two steps of depositing concrete in the positive hogging moment area and negative hogging moment area of continuous combined steel-concrete beam, laying pre-pressing load in the positive hogging moment area and introducing pre-pressing stress into concrete wing plate in the negative hogging moment area, so as to prevent cracking of the wing plate concrete and raise the durability of the structure. Compared with available technology, the construction method of the present invention is simple, fast and practical.

Description

technical field [0001] The wood invention belongs to the field of supporting beam structures in roads, bridges and buildings, and in particular relates to a method for resisting cracking in negative moment areas of steel-concrete composite beams. Background technique [0002] The steel-concrete composite girder bridge combines the steel girder and the reinforced concrete bridge deck to work together, giving full play to the characteristics of good tensile performance of steel and good compressive performance of concrete, so that the overall working performance of the combination of the two structural materials is obviously better A simple superposition of the performance of the two. For bridges with medium-scale spans, composite girder bridges are a relatively new and reasonable bridge type with obvious economic and technical advantages. [0003] For multi-span bridges, the use of continuous composite beams can further reduce the beam height and have better performance. Ho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01D19/00E04C3/293
Inventor 聂建国樊健生
Owner TSINGHUA UNIV
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