CN112663486A - Steel-concrete combined beam structure with increased steel beam in hogging moment area and construction method - Google Patents
Steel-concrete combined beam structure with increased steel beam in hogging moment area and construction method Download PDFInfo
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- CN112663486A CN112663486A CN202110111294.5A CN202110111294A CN112663486A CN 112663486 A CN112663486 A CN 112663486A CN 202110111294 A CN202110111294 A CN 202110111294A CN 112663486 A CN112663486 A CN 112663486A
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Abstract
The invention relates to a steel-concrete combined beam structure with increased steel beam in a hogging moment area and a construction method, which comprises the following steps of: processing and manufacturing a steel beam; welding a shear connector; erecting a steel beam; constructing a concrete bridge deck; constructing a guardrail or an anti-collision wall; and (5) constructing bridge deck pavement. The steel beam is upwards increased in the hogging moment section, 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 section 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 invention avoids the weak point of low tensile strength of the concrete bridge deck slab in the hogging moment area of the continuous composite beam bridge, fully utilizes the tensile strength of the wing plate on the steel beam in the hogging moment area of the continuous beam from the change of the structure so as to reduce the tensile stress of the concrete bridge deck slab, ensures that the stress of the composite beam is more reasonable, improves the disease condition of the hogging moment area of the structure and has good application prospect.
Description
Technical Field
The invention relates to the technical field of civil engineering, in particular to a steel-concrete composite beam structure for increasing steel beams in a hogging moment area and a construction method.
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.
Disclosure of Invention
In view of the defects of the prior art, the technical problem to be solved by the invention is to provide a steel-concrete composite beam structure with an increased steel beam in a hogging moment area and a construction method thereof, so that the defect of low tensile strength of the traditional concrete bridge deck is avoided, the tensile strength of an upper wing plate of the steel beam in the hogging moment area of a continuous beam is fully utilized from the structural change, the tensile stress of the concrete bridge deck is reduced, the stress of the composite beam is more reasonable, and the disease condition of the hogging moment area of the structure is improved. 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 problems, the technical scheme of the invention is as follows: the utility model provides a steel-concrete combination 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.
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.
The construction method of the steel-concrete combined beam structure with the heightened steel beam in the hogging moment area comprises the following steps of:
s1, processing and manufacturing of steel beams: 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; according to the design position of the longitudinal and transverse steel bars of the concrete bridge deck, round holes and through holes are formed in the web plate and the upper flange of the steel beam corresponding to the steel bars;
s2: welding the shear connector: welding shear connectors on the steel beams at certain intervals, wherein the steel beam heightening section shear connectors are welded on the lower part of the upper flange or the upper part and the lower part of the upper flange;
s3, erecting a steel beam: erecting steel beams by adopting a hoisting, pushing or dragging method, and installing a transverse connection structure between the steel beams;
s4: the method comprises the following steps of (1) utilizing a steel template or a profiled steel sheet as a bottom die, wherein the profiled steel sheet does not need to be dismantled after the concrete bridge deck is constructed, binding a bridge deck reinforcing mesh on the bottom die, paying attention to the fact that transverse reinforcing steel bars in a negative moment area need to penetrate through a steel beam web plate, and longitudinal reinforcing steel bars need to penetrate through an upper wing plate of a beam height gradient section, then pouring concrete, and selecting natural curing, standard curing or hot water curing for curing;
s5: constructing a guardrail or an anti-collision wall;
s6: and (5) constructing bridge deck pavement.
Compared with the prior art, the invention has the following beneficial effects: 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 a schematic view of a hogging moment region steel beam height-changing structure according to an embodiment of the invention.
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 a hogging moment region steel beam height-changing structure in accordance with a 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 invention more comprehensible, embodiments accompanied with figures are described in detail below.
As shown in fig. 1 to 4, the steel-concrete composite beam structure with increased steel beam height 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 composite beam, and the steel beam 1 in the hogging moment area of the steel-concrete composite beam is embedded into the concrete bridge deck 2.
In the first embodiment of the invention, as shown in fig. 1-2, the concrete bridge deck 2-1 in the positive bending moment area is positioned at the upper part of the upper wing plate of the steel beam 1, and the concrete bridge deck 2-2 in the negative bending moment area is positioned at the lower part 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 second embodiment and the first 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.
As shown in fig. 1 to 4, the construction method of the steel-concrete composite beam structure with the steel beam in the hogging moment area being heightened comprises the following steps:
s1, processing and manufacturing of steel beams: 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; according to the design position of the longitudinal and transverse steel bars of the concrete bridge deck, round holes and through holes are formed in the web plate and the upper flange of the steel beam corresponding to the steel bars;
s2: welding the shear connector: welding shear connectors on the steel beams at certain intervals, wherein the steel beam heightening section shear connectors are welded on the lower part of the upper flange or the upper part and the lower part of the upper flange;
s3, erecting a steel beam: erecting steel beams by adopting a hoisting, pushing or dragging method, and installing a transverse connection structure between the steel beams;
s4: the method comprises the following steps of (1) utilizing a steel template or a profiled steel sheet as a bottom die, wherein the profiled steel sheet does not need to be dismantled after the concrete bridge deck is constructed, binding a bridge deck reinforcing mesh on the bottom die, paying attention to the fact that transverse reinforcing steel bars in a negative moment area need to penetrate through a steel beam web plate, and longitudinal reinforcing steel bars need to penetrate through an upper wing plate of a beam height gradient section, then pouring concrete, and selecting natural curing, standard curing or hot water curing for curing;
s5: constructing a guardrail or an anti-collision wall;
s6: and (5) constructing bridge deck pavement.
In the embodiment of the invention, the concrete material of the hogging moment area concrete bridge deck slab 2-2 or 2-3 can have two preferable 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-described preferred embodiments, and any one can derive other various types of steel-concrete composite continuous beam structures for increasing steel beams in hogging moment regions and construction methods thereof, according to the teaching of the present invention. All equivalent changes and modifications made according to the claims of the present invention should be covered by the present invention.
Claims (10)
1. Hogging moment district girder steel adds steel-concrete combination beam structure of height, 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.
2. The hogging moment region steel beam heightened steel-concrete composite beam structure 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 hogging moment region steel beam heightened steel-concrete composite beam structure 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 hogging moment region steel beam heightened steel-concrete composite beam structure 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 hogging moment region steel beam heightened steel-concrete composite beam structure 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 hogging moment region steel beam heightened steel-concrete composite beam structure 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 hogging moment region steel beam heightened steel-concrete composite beam structure 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 hogging moment region steel beam heightened steel-concrete composite beam structure 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 hogging moment region steel beam heightened steel-concrete composite beam structure 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.
10. The construction method of the steel-concrete composite beam structure with the steel beam in the hogging moment area increased is characterized in that the steel-concrete composite beam structure with the steel beam in the hogging moment area increased is adopted according to any one of claims 1 to 9, and the construction method is carried out according to the following steps: s1, processing and manufacturing of steel beams: 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; according to the design position of the longitudinal and transverse steel bars of the concrete bridge deck, round holes and through holes are formed in the web plate and the upper flange of the steel beam corresponding to the steel bars; s2: welding the shear connector: welding shear connectors on the steel beams at certain intervals, wherein the steel beam heightening section shear connectors are welded on the lower part of the upper flange or the upper part and the lower part of the upper flange; s3, erecting a steel beam: erecting steel beams by adopting a hoisting, pushing or dragging method, and installing a transverse connection structure between the steel beams; s4: the method comprises the following steps of (1) utilizing a steel template or a profiled steel sheet as a bottom die, wherein the profiled steel sheet does not need to be dismantled after the concrete bridge deck is constructed, binding a bridge deck reinforcing mesh on the bottom die, paying attention to the fact that transverse reinforcing steel bars in a negative moment area need to penetrate through a steel beam web plate, and longitudinal reinforcing steel bars need to penetrate through an upper wing plate of a beam height gradient section, then pouring concrete, and selecting natural curing, standard curing or hot water curing for curing; s5: constructing a guardrail or an anti-collision wall; s6: and (5) constructing bridge deck pavement.
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| CN202110111294.5A CN112663486A (en) | 2021-01-27 | 2021-01-27 | Steel-concrete combined beam structure with increased steel beam in hogging moment area and construction method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113378259A (en) * | 2021-05-14 | 2021-09-10 | 中铁第四勘察设计院集团有限公司 | Method for checking and calculating hogging moment area section of UHPC-NC superimposed bridge deck steel-concrete composite beam |
| CN114086458A (en) * | 2021-12-27 | 2022-02-25 | 福州大学 | Steel-concrete combined box girder structure with wave-shaped upper flange beam and construction method |
-
2021
- 2021-01-27 CN CN202110111294.5A patent/CN112663486A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113378259A (en) * | 2021-05-14 | 2021-09-10 | 中铁第四勘察设计院集团有限公司 | Method for checking and calculating hogging moment area section of UHPC-NC superimposed bridge deck steel-concrete composite beam |
| CN113378259B (en) * | 2021-05-14 | 2022-04-01 | 中铁第四勘察设计院集团有限公司 | Method for checking and calculating hogging moment area section of UHPC-NC superimposed bridge deck steel-concrete composite beam |
| CN114086458A (en) * | 2021-12-27 | 2022-02-25 | 福州大学 | Steel-concrete combined box girder structure with wave-shaped upper flange beam and construction method |
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