Intensive longitudinal clapboard UHPC box girder bridge

A technology of longitudinal diaphragm and box girder, applied in bridges, bridge materials, bridge construction and other directions, can solve the problems of resisting longitudinal positive bending moment, increase transverse bending stiffness, increase bridge dead load and other problems, so as to improve the shear bearing capacity. , The effect of improving longitudinal stiffness and increasing longitudinal stiffness

Active Publication Date: 2018-08-14
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, according to the above two types of one-way bearing plates, the two suitable design methods are: (1) reduce the distance between the longitudinal diaphragm and increase the distance between the transverse diaphragm: this method will To increase the dead load of the bridge, for ordinary concrete girder bridges (the design basically does not consider its own tensile capacity), under the action of live loads such as vehicles, the lateral local stress is likely to cause cracking of the bridge deck, and it is necessary to install transverse prestressed tendons to To meet the stress requirements; (2) Set fewer longitudinal diaphragms and densely arrange transverse diaphragms: This method increases the transverse bending stiffness and reduces the distortion effect of the box girder, but increases the dead load of the bridge to a certain extent and the resistance to resistance Positive longitudinal bending moments are not beneficial

Method used

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  • Intensive longitudinal clapboard UHPC box girder bridge
  • Intensive longitudinal clapboard UHPC box girder bridge
  • Intensive longitudinal clapboard UHPC box girder bridge

Examples

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Embodiment 1

[0029] refer to Figure 1~3 , a UHPC box girder bridge with dense longitudinal diaphragms in this embodiment, including a top plate 1, a bottom plate 2, a web 5, a transverse diaphragm 3, an end transverse diaphragm 4, and three longitudinal diaphragms 6 arranged along the longitudinal direction of the bridge. For the box girder, the web 5 and the longitudinal diaphragm 6 are provided with unilateral longitudinal stiffeners 7 to increase the transverse bending stiffness of the web 5 and the longitudinal diaphragm 6 and prevent lateral buckling.

[0030] The UHPC box girder bridge is provided with an end diaphragm 4 at the support position, the end diaphragm increases the transverse stiffness of the bridge, and can better transmit the force of the support, so as to ensure the transverse stiffness of the box girder and improve the box girder. overall strength of the beam.

[0031] The distance between adjacent medial diaphragms 6 along the width direction of the bridge is 2~5m,...

Embodiment 2

[0037] refer to Figure 4 , compared with Example 1, a kind of UHPC box girder bridge with dense mediastinal plates in this example has the following differences:

[0038] Short longitudinal ribs 8 are provided at the middle part of the adjacent medial diaphragm 6 and the cantilever flange, which effectively improves the longitudinal stiffness of the box girder and reduces the amount of longitudinal prestressed reinforcement 10 .

[0039] refer to Figure 5 , The web 5, the longitudinal diaphragm 6, the short longitudinal rib 8 and the top plate 1 / bottom plate 2 are provided with a prestressed anchor tooth block 9, which is beneficial to achieve a better anchoring effect on the prestressed steel bar 10.

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Abstract

The invention discloses an intensive longitudinal clapboard UHPC box girder bridge. The bridge comprises a box girder composed of a top plate, a base plate, a web plate, a transverse clapboard and atleast two longitudinal clapboards arranged in the longitudinal bridge direction, and the web plate and the longitudinal clapboards are provided with single edge longitudinal stiffening ribs. By optimizing structure details, the transverse anti-bending bearing capacity of the web plate and longitudinal clapboards is significantly improved, and lateral bending of the box girder, web plate and longitudinal clapboards is effectively avoided. The transverse distance between two adjacent supporting seats of the box girder bridge at least exceeds two times distance of the longitudinal clapboard, thestress meets stress characteristics of a one-way slab, namely, the longitudinal stress and the transverse stress do not interact with each other, and the bridge gives full play to the UHPC material strength; according to the bridge, by intensively arranging the longitudinal clapboards, the shear capacity of the box girder is improved, the longitudinal rigidity of the box girder is improved, the use quantity of longitudinal prestressed rebar is reduced, and the better economic benefits are achieved.

Description

technical field [0001] The invention relates to the technical field of concrete box girders, in particular to a dense longitudinal diaphragm UHPC box girder bridge. Background technique [0002] According to statistics, in the prestressed concrete girder bridges that have been built, when the span exceeds 60m, the cross-section of the bridge is mostly a box girder section. Jia Xiantao mentioned in "Study on the Mechanical Properties of Box Girders Added with Longitudinal Diaphragms and Stiffeners": When the bridge width is wide and the span is large, it is generally necessary to install longitudinal diaphragms to increase the longitudinal stiffness of the bridge and improve the overall bearing capacity of the box girder. power performance. [0003] The deck of a box girder bridge is a four-sided supporting plate. According to the advanced bridge structure theory, when the distance between adjacent transverse diaphragms exceeds twice the distance between adjacent longitudina...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01D2/04E01D101/28
CPCE01D2/04E01D2101/28
Inventor 李传习冯峥潘仁胜聂洁
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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