CN214573277U - Steel-concrete combined continuous beam structure with steel beam heightening in hogging moment area - Google Patents

Steel-concrete combined continuous beam structure with steel beam heightening in hogging moment area Download PDF

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Publication number
CN214573277U
CN214573277U CN202120229514.XU CN202120229514U CN214573277U CN 214573277 U CN214573277 U CN 214573277U CN 202120229514 U CN202120229514 U CN 202120229514U CN 214573277 U CN214573277 U CN 214573277U
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steel
concrete
hogging moment
bridge deck
steel beam
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陈宜言
黄光铃
赵秋
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Fuzhou University
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Fuzhou University
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Abstract

The utility model relates to a steel-concrete combination continuous beam structure that hogging moment district girder steel increases, including girder steel, concrete decking and shear force connecting piece, its characterized in that: the steel beam extends upwards in the hogging moment section to increase the beam height, the concrete bridge deck is connected with the steel beam through a shear connector to form a combined beam, and the steel beam in the hogging moment area of the steel-concrete combined beam is embedded into the concrete bridge deck; the concrete bridge deck plate in the positive bending moment area is positioned at the upper part of the upper flange of the steel beam, and the concrete bridge deck plate in the negative bending moment area is positioned at the lower part of the upper flange of the steel beam or wraps the upper flange of the steel beam. The utility model discloses avoid the weak point that continuous combination beam bridge hogging moment district concrete bridge deck slab's tensile strength is low, from the change in the structure come the upper wing plate tensile strength of make full use of continuous beam hogging moment district girder steel to reduce concrete bridge deck slab tensile stress, make the combination beam atress more reasonable, improve this structure hogging moment district disease condition, have good application prospect.

Description

Steel-concrete combined continuous beam structure with steel beam heightening in hogging moment area
Technical Field
The utility model belongs to the technical field of civil engineering technique and specifically relates to a steel-concrete combination continuous beam structure that hogging moment district girder steel increases is related to.
Background
The steel-concrete combined beam structure has the advantages of two materials, namely steel and concrete, is reasonable in material utilization, high in economic construction speed and strong in practicability, and is widely applied to the fields of roads, bridges and buildings. However, the concrete in the hogging moment region of the composite structural continuous beam is prone to crack in tension, resulting in poor durability of the composite beam. At present, the following methods are mainly used for solving the problem: firstly, changing the construction sequence, and constructing a bridge deck after the steel beam in the hogging moment area is fully tensioned to reduce the tensile stress of the bridge deck; secondly, increasing the reinforcement ratio of the bridge deck structure or controlling the number and the width of cracks by using high-performance concrete; and thirdly, improving the construction process, and reducing or avoiding the tensile stress of the concrete slab by adopting methods such as prestress application and the like. However, by changing the construction sequence, the concrete bridge deck still bears most of the adverse effects of long-term load after the bridge; when the method such as reinforcing bar addition and the like is used independently, the crack is generated for a long time, and the durability is adversely affected; the method of applying the pre-stress and the like inevitably applies additional stress to the shear connection member, which not only increases the burden of the steel beam, but also weakens the effect of the pre-stress applied to the concrete slab.
SUMMERY OF THE UTILITY MODEL
In view of the not enough of prior art, the utility model aims to solve the technical problem that a hogging moment district girder steel adds high steel-concrete combination continuous beam structure and construction method are provided, avoid the weak point that traditional concrete decking's tensile strength is low, come the upper wing plate tensile strength of make full use of continuous beam hogging moment district girder steel from the change in the structure to reduce concrete decking tensile stress, make the combination beam atress more reasonable, improve this structure hogging moment district disease condition. Meanwhile, two optimal schemes can be selected for the concrete bridge deck slab in the hogging moment area, firstly, thin-layer ultrahigh-performance concrete and the steel beam are combined to bear force together, and the characteristics of high tensile strength and good crack resistance of the ultrahigh-performance concrete are fully exerted; secondly, the ECC concrete is used to enable the steel beam to be used as a main stress member, thereby overcoming the defects of brittleness and weak stretchability of the traditional concrete and better adapting to the deformation of the steel beam. The two kinds of high-performance concrete have the characteristics of light self weight, good durability and fatigue resistance and the like, and have good application prospects.
In order to solve the technical problem, the technical scheme of the utility model is that: including girder steel, concrete decking and shear force connecting piece, its characterized in that: the steel beam extends upwards in the hogging moment section to increase the beam height, the concrete bridge deck is connected with the steel beam through a shear connector to form a combined beam, and the steel beam in the hogging moment area of the steel-concrete combined beam is embedded into the concrete bridge deck.
Further, a concrete bridge deck in the positive bending moment area of the steel-concrete composite beam is positioned at the upper part of the steel beam upper wing plate; the concrete bridge deck in the hogging moment area of the steel-concrete composite beam is positioned at the lower part of the steel beam upper flange or wraps the steel beam upper flange.
Furthermore, the length of the increase section of the steel beam height in the hogging moment area of the steel-concrete composite beam is 0.2-0.5 times of the length of a single-hole bridge (namely the length of a bridge hole between adjacent steel beams), and the change of the beam height is realized by gradually changing the beam height, namely, the upper steel beam wing plate in the transition area from the positive bending moment area of the steel-concrete composite beam to the hogging moment area of the steel-concrete composite beam extends obliquely upwards.
Furthermore, the top plane of the upper wing plate of the section of the steel beam in the hogging moment area is higher than the bottom plane of the concrete bridge deck.
Furthermore, an upper layer of reinforcing mesh and a lower layer of reinforcing mesh are arranged in the concrete bridge deck, and the reinforcing meshes consist of longitudinal reinforcing steel bars and transverse reinforcing steel bars at certain intervals; and the steel beam web plate in the hogging moment area of the steel-concrete composite beam is provided with round holes for transverse passing of transverse steel bars, and the positions of the round holes correspond to the transverse steel bars one by one.
Furthermore, the wing plate is provided with a through hole on the steel beam height transition section, the position of the through hole corresponds to the longitudinal steel bar of the concrete bridge deck, and the longitudinal steel bar of the concrete bridge deck penetrates through the through hole on the upper flange of the steel beam.
Furthermore, the shear connectors in the hogging moment area of the steel-concrete composite beam are arranged at the lower part of the upper flange of the steel beam or the upper part and the lower part of the upper flange of the steel beam at certain intervals and are arranged in an up-and-down symmetrical mode.
Furthermore, shear connectors are arranged on the upper surface and the lower surface of the upper flange at the section with gradually changed height of the steel beam of the steel-concrete composite beam at a certain interval.
Further, the concrete bridge deck or the steel beam upper flange and the upper part of the concrete bridge deck are paved with a bridge deck.
Compared with the prior art, the utility model discloses following beneficial effect has: the weak point of low tensile strength of the concrete bridge deck slab in the hogging moment area of the continuous composite beam bridge is avoided, the tensile strength of the steel beam upper wing plate in the hogging moment area of the continuous beam is fully utilized from structural change, so that the tensile stress of the concrete bridge deck slab is reduced, the stress of the composite beam is more reasonable, the disease condition of the hogging moment area of the structure is improved, and the application prospect is good.
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Drawings
Fig. 1 is a schematic cross-sectional structure view of a cross-bridge according to a first embodiment of the present invention.
Fig. 2 is the utility model provides a hogging moment district girder steel uprises the schematic diagram.
Fig. 3 is a schematic cross-sectional structure view of a cross bridge according to a second embodiment of the present invention.
Fig. 4 is a schematic view of the hogging moment area steel beam height-changing structure of the second embodiment of the present invention.
In the figure: 1-steel beam, 2-1-concrete bridge deck in positive bending moment area, 2-2-concrete bridge deck in negative bending moment area in embodiment I, 2-3-concrete bridge deck in negative bending moment area in embodiment II, 3-shear connector, 4-through hole and 5-round hole.
Detailed Description
In order to make the aforementioned and other features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
As shown in fig. 1 to 4, the steel-concrete combined continuous beam structure with increased steel beam in the hogging moment area comprises a steel beam 1, a concrete bridge deck 2 and a shear connector 3, wherein the steel beam 1 is increased upwards in the hogging moment area, the concrete bridge deck 2 is connected with the steel beam 1 through the shear connector 3 to form a combined beam, and the steel beam 1 in the hogging moment area of the steel-concrete combined beam is embedded into the concrete bridge deck 2.
In the first embodiment of the present invention, as shown in fig. 1-2, the concrete bridge deck 2-1 in the positive bending moment area is located on the upper portion of the upper wing plate of the steel beam 1, and the concrete bridge deck 2-2 in the negative bending moment area is located on the lower portion of the upper wing plate of the steel beam 1; the shear connectors 3 are arranged on the lower part of the upper flange of the hogging moment area of the steel beam 1 and the upper and lower surfaces of the upper flange at the height gradual change section of the steel beam 1 at certain intervals; a web plate in the hogging moment area of the steel beam 1 is provided with a plurality of round holes 5, the positions of the round holes correspond to transverse steel bars of the concrete bridge deck 2-2, a wing plate on the beam height gradual change section of the steel beam 1 is provided with a plurality of through holes 4, and the positions of the through holes correspond to longitudinal steel bars of the concrete bridge deck 2-2; and the upper and lower layers of reinforcing meshes of the hogging moment area concrete bridge deck 2-2 are positioned at the lower part of the upper wing plate of the hogging moment area of the steel beam 1.
In the second embodiment of the present invention, as shown in fig. 3 to 4, the main differences between the first embodiment and the second embodiment are: the hogging moment area concrete bridge deck 2-3 wraps the upper wing plate of the steel beam 1; the shear connectors 3 are arranged at the upper part and the lower part of the flange on the hogging moment area of the steel beam 1 at certain intervals; the upper and lower layers of reinforcing meshes of the hogging moment area concrete bridge deck slab 2-3 are respectively positioned at the upper part and the lower part of the upper wing plate of the hogging moment area of the steel beam 1.
In the process of constructing the bridge lower structure, the steel beam is processed and manufactured at the same time, and the corners of the upper wing plates of the steel beam height transition sections are smoothly processed, so that stress concentration is reduced; the steel formwork or the profiled steel sheet can be used as the bottom formwork for constructing the concrete bridge deck, wherein the profiled steel sheet does not need to be detached after the concrete bridge deck is constructed.
In the embodiment of the present invention, the concrete material of the hogging moment area concrete bridge deck 2-2 or 2-3 may have two preferred schemes: firstly, thin-layer ultrahigh-performance concrete and a steel beam are combined to bear force together, and the characteristics of high tensile strength and good crack resistance of the ultrahigh-performance concrete are exerted; and secondly, the ECC concrete is used to enable the steel beam to serve as a main stress member, so that the defects of brittleness and weak stretchability of the traditional concrete are overcome, and the deformation of the steel beam is better adapted. In addition, the two high-performance concretes have the characteristics of light self weight, good durability and fatigue resistance and the like, and have good application prospect.
The present invention is not limited to the above-mentioned preferred embodiments, and any person can obtain the steel-concrete combined continuous beam structure with increased steel beams in hogging moment areas in various forms. All the equivalent changes and modifications made according to the claims of the present invention shall fall within the scope of the present invention.

Claims (9)

1. The utility model provides a steel-concrete combination continuous beam structure that hogging moment district girder steel increases, includes girder steel, concrete decking and shear force connecting piece, its characterized in that: the steel beam extends upwards in the hogging moment section to increase the beam height, the concrete bridge deck is connected with the steel beam through a shear connector to form a combined beam, and the steel beam in the hogging moment area of the steel-concrete combined beam is embedded into the concrete bridge deck.
2. The steel-concrete composite continuous beam structure for hogging moment region steel beam heightening according to claim 1, characterized in that: the concrete bridge deck in the positive bending moment area of the steel-concrete composite beam is positioned at the upper part of the upper wing plate of the steel beam; the concrete bridge deck in the hogging moment area of the steel-concrete composite beam is positioned at the lower part of the steel beam upper flange or wraps the steel beam upper flange.
3. The steel-concrete composite continuous beam structure for hogging moment region steel beam heightening according to claim 2, characterized in that: the length of the steel beam height increase section in the hogging moment area of the steel-concrete composite beam is 0.2-0.5 times of the length of the hole bridge, and the change of the beam height is realized by gradually changing the beam height, namely, an upper steel beam wing plate in the transition area from the positive bending moment area of the steel-concrete composite beam to the hogging moment area of the steel-concrete composite beam extends obliquely upwards.
4. The steel-concrete composite continuous beam structure for hogging moment region steel beam heightening according to claim 1, characterized in that: and the top plane of an upper wing plate of the section of the steel beam in the hogging moment area is higher than the bottom plane of the concrete bridge deck.
5. The steel-concrete composite continuous beam structure for hogging moment region steel beam heightening according to claim 1, characterized in that: an upper layer of reinforcing mesh and a lower layer of reinforcing mesh are arranged in the concrete bridge deck, and the reinforcing meshes consist of longitudinal and transverse reinforcing steel bars at certain intervals; and the steel beam web plate in the hogging moment area of the steel-concrete composite beam is provided with round holes for transverse passing of transverse steel bars, and the positions of the round holes correspond to the transverse steel bars one by one.
6. The steel-concrete composite continuous beam structure for hogging moment region steel beam heightening according to claim 5, characterized in that: the steel beam height transition section upper wing plate is provided with a through hole, the position of the through hole corresponds to the longitudinal steel bar of the concrete bridge deck, and the longitudinal steel bar of the concrete bridge deck penetrates through the steel beam upper flange through hole.
7. The steel-concrete composite continuous beam structure for hogging moment region steel beam heightening according to claim 1, characterized in that: the shear connectors of the hogging moment area of the steel-concrete composite beam are arranged at the lower part of the upper flange of the steel beam or the upper part and the lower part of the upper flange of the steel beam at certain intervals and are arranged up and down symmetrically.
8. The steel-concrete composite continuous beam structure for hogging moment region steel beam heightening according to claim 1, characterized in that: and shear connectors are arranged on the upper and lower surfaces of the upper flange at the steel beam height gradient section of the steel-concrete composite beam at certain intervals.
9. The steel-concrete composite continuous beam structure for hogging moment region steel beam heightening according to claim 1, characterized in that: and paving the bridge deck on the concrete bridge deck or the upper flange of the steel beam and the upper part of the concrete bridge deck.
CN202120229514.XU 2021-01-27 2021-01-27 Steel-concrete combined continuous beam structure with steel beam heightening in hogging moment area Active CN214573277U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202120229514.XU CN214573277U (en) 2021-01-27 2021-01-27 Steel-concrete combined continuous beam structure with steel beam heightening in hogging moment area

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202120229514.XU CN214573277U (en) 2021-01-27 2021-01-27 Steel-concrete combined continuous beam structure with steel beam heightening in hogging moment area

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Publication Number Publication Date
CN214573277U true CN214573277U (en) 2021-11-02

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