CN112195778A - Toughness combination bridge deck plate composed of T-shaped steel - Google Patents
Toughness combination bridge deck plate composed of T-shaped steel Download PDFInfo
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- CN112195778A CN112195778A CN202011002832.9A CN202011002832A CN112195778A CN 112195778 A CN112195778 A CN 112195778A CN 202011002832 A CN202011002832 A CN 202011002832A CN 112195778 A CN112195778 A CN 112195778A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/12—Grating or flooring for bridges; Fastening railway sleepers or tracks to bridges
- E01D19/125—Grating or flooring for bridges
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
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Abstract
The invention discloses a toughness combined bridge deck system composed of T-shaped steel, which comprises hot-rolled T-shaped steel, transverse steel bars and ultrahigh-toughness concrete. The T-shaped steel is continuously placed side by side along the transverse direction of the bridge deck, and the adjacent shaped steel is welded through two fillet welds to form a bridge deck steel framework. The flange at the lower side of the T-shaped steel is longer, so that the effect of external strengthening of the plate surface is achieved; the flange on the upper side of the hot-rolled T-shaped steel is shorter and is provided with a row of round holes, and the transverse steel bar penetrates through the flange of each T-shaped steel through the round holes. The ultra-high toughness concrete is poured on the bridge deck steel skeleton to play a role in protecting the bridge deck steel skeleton. In the combined bridge deck slab system provided by the invention, the ultra-high-toughness concrete can ensure that no or only micro cracks below 100 micrometers are generated, and the toughness and durability of the structure are improved; the structural mode that T shaped steel and transverse reinforcement combined together has replaced the shear and resistance to plucking effect of peg, has promoted the off-plane stability of decking simultaneously, is showing reduction material cost and construction complexity, and fatigue performance is superior.
Description
Technical Field
The invention relates to the technical field of structural engineering, in particular to a toughness combined bridge deck composed of T-shaped steel.
Background
With the continuous promotion of the infrastructure construction process of China, people realize that the convenience degree of urban internal traffic and urban inter-traffic greatly influences the national economic development and social progress; therefore, the country has realized the big development of road, bridge engineering in recent decades. The bridge structure is not only widely applied to urban overpasses, subway light rails, high-speed railways and the like, but also widely applied to river-crossing and sea-crossing structures. In recent years, with the construction of ultra-large bridge projects such as the mao bridge in hong kong zhu and the mao bridge in hangzhou bay, bridge structures at home and abroad face unprecedented opportunities for development. In the construction of bridge structures, the bridge deck plate not only plays a role in bearing loads such as the dead weight of an upper structure and passing vehicles, but also faces long-term effects such as wheel friction, driving vibration, water and ion erosion, and the like, so that higher requirements are put forward on the bearing capacity, durability and toughness of the bridge deck plate.
The reinforced concrete bridge deck is widely applied in actual engineering, but cannot be applied to bridge structures with large span due to the fact that the self weight of concrete is large and the tensile property of concrete materials is poor. In order to solve the problem, orthotropic steel bridge deck slabs are produced at the same time; the orthotropic bridge deck system formed by arranging longitudinal and transverse stiffening ribs outside the steel bridge deck can obviously improve the bearing efficiency of the bridge deck and the economic span of the structure; however, considering that steel materials are easy to rust when exposed to air for a long time, the durability of the orthotropic bridge deck becomes a problem to be solved urgently in engineering.
In order to solve the problems, a combined bridge deck system is formed by combining steel and concrete materials in engineering, so that the tensile property of the steel and the compressive property of the concrete are fully exerted, and the bearing performance of the structure is further improved. However, the existing steel-concrete composite bridge deck still has some problems: firstly, in order to ensure sufficient shear connection between steel and concrete and prevent the separation of the interface between the steel and the concrete, more studs (playing the double roles of shear resistance and pulling resistance) are usually arranged between the steel and the concrete, so that the construction workload is greatly increased, and the fatigue performance of the structure is influenced due to the existence of welding seams; secondly, the steel deck sections in the composite deck slab usually require a plurality of stiffening ribs to be welded out of plane, which also increases the amount of construction and affects the fatigue performance of the structure; thirdly, the common concrete material is easy to crack after being tensioned and is sensitive to local defects, cracks are easy to generate under the action of long-term load, water and ions are corroded, the corrosion resistance and durability of the bridge deck are affected, the maintenance cost of the bridge structure is obviously increased, and huge waste is caused to manpower and material resources.
Disclosure of Invention
In order to solve the problems of the traditional steel-concrete combined bridge deck slab system, the invention provides a toughness combined bridge deck slab consisting of T-shaped steel.
A toughness combination bridge deck composed of T-shaped steel comprises:
continuously placing a plurality of hot-rolled T-shaped steels side by side along the transverse direction of the bridge floor, wherein each hot-rolled T-shaped steel comprises a web and flanges, and each flange comprises a first flange (an upper flange) and a second flange (a lower flange);
the steel bars penetrate through the flanges;
and concrete poured on a bridge deck steel framework formed by the hot-rolled T-shaped steel and the steel bars.
In the invention, the T-shaped steels are continuously arranged side by side along the transverse direction of the bridge deck, and the adjacent section steels are welded through two fillet welds to form a bridge deck steel framework. The flange at the lower side of the T-shaped steel is longer, so that the effect of external strengthening of the plate surface is achieved; the hot rolling T-shaped steel upper side flange is shorter and is provided with a row of round holes, and the transverse steel bar penetrates through the T-shaped steel flanges through the round holes. The ultra-high toughness concrete is poured on the bridge deck steel skeleton to play a role in protecting the bridge deck steel skeleton. In the combined bridge deck slab system provided by the invention, the ultra-high-toughness concrete can ensure that no or only micro cracks below 100 micrometers are generated, and the toughness and durability of the structure are improved; the structural mode that T shaped steel and transverse reinforcement combined together has replaced the shear and resistance to plucking effect of peg, has promoted the off-plane stability of decking simultaneously, is showing reduction material cost and construction complexity, and fatigue performance is superior.
In the invention, the T-shaped steels are continuously arranged side by side along the transverse direction of the bridge deck, and the adjacent section steels are welded through two fillet welds to form a bridge deck steel framework. The flange at the lower side of the T-shaped steel is longer, so that the effect of external strengthening of the plate surface is achieved; the flange on the upper side of the hot-rolled T-shaped steel is shorter and is provided with a row of round holes, and the transverse steel bar penetrates through the flange of each T-shaped steel through the round holes. The ultra-high toughness concrete is poured on the bridge deck steel skeleton to play a role in protecting the bridge deck steel skeleton. In the combined bridge deck slab system provided by the invention, the ultra-high-toughness concrete can ensure that no or only micro cracks below 100 micrometers are generated, and the toughness and durability of the structure are improved; the structural mode that T shaped steel and transverse reinforcement combined together has replaced the shear and resistance to plucking effect of peg, has promoted the off-plane stability of decking simultaneously, is showing reduction material cost and construction complexity, and fatigue performance is superior.
The following are preferred technical schemes of the invention:
and a plurality of hot-rolled T-shaped steels are sequentially welded along the transverse direction of the bridge floor, and the flange of the previous hot-rolled T-shaped steel is welded with the web of the next hot-rolled T-shaped steel. And the flange of the previous hot-rolled T-shaped steel and the web of the next hot-rolled T-shaped steel are welded by adopting two fillet welds.
A row of round holes are formed in the flange of the upper side of the hot-rolled T-shaped steel, and the steel bars penetrate through the flanges of the hot-rolled T-shaped steel through the round holes. And the steel bars transversely penetrate through the upper side flanges of the hot-rolled T-shaped steels along the bridge floor.
The lower flange of the hot-rolled T-shaped steel is longer than the upper flange. The upper flange of the hot-rolled T-shaped steel is shorter than the lower flange.
In the toughness combined bridge deck slab formed by the T-shaped steel, the hot-rolled T-shaped steel is horizontally and continuously placed side by side along the bridge deck, and the adjacent steel forms a bridge deck steel framework through welding two fillet welds.
In the toughness combined bridge deck slab composed of the T-shaped steel, the flange at the lower side of the hot-rolled T-shaped steel is longer, so that the effect of external strengthening of the slab surface is achieved; the hot rolling T shaped steel upside edge of a wing is shorter and it has opened a row of round hole on it, horizontal reinforcing bar passes each T shaped steel edge of a wing through the round hole.
In the tough combined bridge deck slab formed by the T-shaped steel, ultra-high-toughness concrete is poured on a bridge deck steel framework; the thickness of the ultra-high toughness concrete layer is slightly higher than the length of the flange at the upper side of the T-shaped steel, and the effect of protecting the steel skeleton of the bridge deck is achieved. The thickness of the concrete layer is higher than that of the upper flange of the hot-rolled T-shaped steel, and the thickness of the concrete layer is 20% -60% of that of the upper flange of the hot-rolled T-shaped steel. Namely, the thickness of the concrete layer is 120 to 160 percent of the length of the upper flange of the hot-rolled T-shaped steel.
The concrete adopts ultra-high-toughness concrete, and the ultra-high-toughness concrete adopted by the invention comprises cement, an active mineral admixture, aggregate, reinforcing fiber and water, wherein the cement and the active mineral admixture adopt the following raw materials in percentage by weight:
most preferably, the following raw materials are used in percentage by weight:
the toughness combined bridge deck plate composed of the T-shaped steel is formed by combining a steel skeleton formed by welding hot-rolled T-shaped steel, transverse steel bars and ultra-high toughness concrete, and has the following advantages:
(1) the adopted ultra-high-toughness concrete has high bearing capacity under compression, shows strain hardening characteristics under tension, can stably reach more than 3 percent under the limit tensile strain, only has a plurality of densely distributed fine cracks under the limit tensile strain, can effectively separate steel from the external environment, prevents the steel from being corroded, and improves the toughness, the corrosion resistance and the durability of a bridge deck structure.
(2) The bridge deck steel skeleton is formed by welding hot-rolled T-shaped steel, the processing process is simple and efficient, and the bridge deck steel skeleton can be combined with an industrial welding robot, so that the processing process is industrialized; the bridge deck parameters can be flexibly changed by changing the size of the section steel, so that the modularization degree of a bridge deck system is improved while design and construction are facilitated.
(3) The shear connection effect between the steel skeleton and the ultra-high toughness concrete is ensured by utilizing the combined structural mode of the upper side flange of the hot-rolled T-shaped steel and the transverse passing steel bar, and simultaneously, the anti-pulling effect is achieved, and the separation of the steel and concrete interface is prevented; the system avoids the use of studs, obviously reduces the construction complexity and the cost, and simultaneously obviously improves the fatigue performance of the structure.
(4) The hot rolling T shaped steel upside flange has vertically played the effect of longitudinal reinforcement at the bridge floor, therefore the use of longitudinal reinforcement is avoided to the accessible appropriately adjusting shaped steel size, avoids ligature reinforcing bar net when reducing the steel quantity to show promotion efficiency of construction, reduce cost.
(5) The flange at the lower side of the hot-rolled T-shaped steel plays a role of external stiffening, so that the external stability of the bridge deck slab is obviously improved, additional welding seams are not added, and the fatigue performance of the structure is ensured.
Drawings
FIG. 1 is a transverse cross-sectional view of a tough composite decking system;
FIG. 2 is a longitudinal cross-sectional view of a tough composite decking system;
FIG. 3 is a schematic view of the bridge deck steel skeleton;
FIG. 4 is a schematic view of a hot rolled T-section steel.
Detailed Description
The following describes in detail embodiments of a tough composite bridge deck composed of T-section steel according to the present invention with reference to the accompanying drawings.
As shown in fig. 1 and 2, a tough composite bridge deck composed of T-section steel comprises the following components: hot rolling T-shaped steel 1, transverse steel bars 2 and ultra-high toughness concrete 4.
As shown in figure 3, the hot-rolled T-shaped steel 1 is continuously arranged side by side along the transverse direction of the bridge deck, and the adjacent hot-rolled T-shaped steel 1 is welded through two fillet welds 3 to form a bridge deck steel framework. And 5 is the longitudinal direction of the bridge deck.
As shown in fig. 4, the flange at the lower side of the hot-rolled T-shaped steel 1 is longer and plays a role of external reinforcement of the plate surface; the flange on the upper side of the hot-rolled T-shaped steel 1 is shorter and is provided with a row of round holes, and the transverse steel bar 2 penetrates through the flange of each T-shaped steel 1 through the round holes.
As shown in fig. 1 and 2, the ultra-high toughness concrete 4 is poured on the bridge deck steel framework; the thickness of the ultra-high toughness concrete 4 is slightly higher than the length of the flange at the upper side of the T-shaped steel 1, and the ultra-high toughness concrete plays a role in protecting a steel skeleton of the bridge deck.
The ultra-high toughness concrete comprises the following components of cement, an active mineral admixture, aggregate, fiber and water, wherein the active mineral admixture comprises fly ash, silica fume, granulated blast furnace slag and metakaolin, the maximum particle size of the aggregate is not more than 0.5mm, the fiber adopts one or the combination of more than one of polyvinyl alcohol fiber, polyethylene fiber and aromatic polyamide fiber, the fiber length is 5-25 mm, the diameter is 0.015-0.055 mm, the elastic modulus is 30-150 GPa, the tensile strength is 1000-3500 MPa, the ultimate elongation is 2-15%, and the weight ratio of the cement to the active mineral admixture is as follows:
the performance test of the ultra-high toughness concrete obtained under the mixing proportion shows that the ultimate tensile strain can reach 3.2 percent (about 320 times of the concrete), and the width of a corresponding crack is 0.049mm when the ultimate tensile strain is achieved; the flexural strength was 12.8MPa (about 2 times that of concrete), the uniaxial compressive strength was 48MPa, and the compressive strain corresponding to the peak load was 0.55% (about 2 times that of concrete).
The ultra-high toughness concrete adopted by the toughness combined bridge deck slab composed of the T-shaped steel can ensure that the ultra-high toughness concrete does not generate or only generates micro cracks below 100 micrometers under the actions of pulling, pressing, bending and other various loads, has the functions of cracking resistance, seepage prevention and corrosion resistance, and obviously improves the toughness and durability of the structure. The structure mode of combining the perforated hot-rolled T-shaped steel and the transverse passing steel bars can play an effective role in shearing resistance and pulling resistance, so that the function of the stud in a combined structure is effectively replaced. Research shows that in the traditional steel-concrete combined bridge deck slab, if a complete shear connection effect needs to be realized, the number of the studs in each square meter of the bridge deck slab is different from 20 to 100, and the number of the studs is increased along with the increase of factors such as the thickness of a concrete layer, the strength of concrete, external load and the like; the invention can effectively eliminate the negative effects of the material cost, the construction cost and the welding of the studs on the fatigue performance. The invention effectively avoids the use requirement of the longitudinal steel bar, reduces the material cost and shortens the construction period; in addition, the out-of-plane stability of the bridge deck can be obviously improved by hot rolling the lower side flange of the T-shaped steel, and additional welding seams are not added. Therefore, the toughness combined bridge deck provided by the invention can improve the toughness and durability of the structure, greatly reduce the material cost and the construction complexity, and has potential of popularization and application in bridge structures.
Claims (9)
1. The utility model provides a toughness combination decking that T shaped steel is constituteed which characterized in that includes:
continuously placing a plurality of hot-rolled T-shaped steels side by side along the transverse direction of the bridge floor, wherein each hot-rolled T-shaped steel comprises a web and a flange, and each flange comprises an upper flange and a lower flange;
the steel bars penetrate through the flanges;
and concrete poured on a bridge deck steel framework formed by the hot-rolled T-shaped steel and the steel bars.
2. The bridge deck slab comprising T-section steel according to claim 1, wherein a plurality of hot-rolled T-section steel are welded in sequence in a transverse direction of the bridge deck, and the flange of the previous hot-rolled T-section steel is welded to the web of the next hot-rolled T-section steel.
3. The bridge deck slab comprising T-section steel as claimed in claim 2, wherein the flanges of the previous hot-rolled T-section steel are welded to the webs of the next hot-rolled T-section steel by two fillet welds.
4. A flexible composite bridge deck slab comprising T-section steel as claimed in claim 1, wherein said top flanges of said hot rolled T-section steel are formed with a row of circular holes through which said reinforcing bars pass through each of said hot rolled T-section steel flanges.
5. A flexible composite deck slab of T-section steel as claimed in claim 4, wherein said reinforcing bars are installed transversely along the deck to the upper flanges of each of said T-section steel.
6. A flexible composite decking constructed from T-section steel as claimed in claim 1 wherein the lower flanges of the hot rolled T-section steel are longer than the upper flanges.
7. The flexible composite bridge deck slab of T-section steel as claimed in claim 1, wherein said concrete layer has a thickness greater than the upper flange of said hot rolled T-section steel.
8. The flexible composite bridge deck slab of T-section steel as claimed in claim 1, wherein the thickness of said concrete layer is 120-160% of the length of the upper flange of said hot-rolled T-section steel.
9. The tough combined bridge deck composed of T-shaped steel according to claim 1, wherein the concrete is ultra-high-toughness concrete, and the following raw materials in percentage by weight are adopted:
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011002832.9A CN112195778B (en) | 2020-09-22 | 2020-09-22 | Toughness combination bridge deck plate composed of T-shaped steel |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113062216A (en) * | 2021-02-07 | 2021-07-02 | 浙江大学 | Prefabricated assembly type toughness combined bridge deck with cast-in-place wet joint and manufacturing method |
| CN113062217A (en) * | 2021-02-22 | 2021-07-02 | 浙江大学 | Super-high-toughness combined bridge deck for assembly connection of angle steel and profiled steel sheet |
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| JP2001027005A (en) * | 1999-07-14 | 2001-01-30 | Nippon Steel Corp | Connection structure of steel member and concrete in a composite structure |
| CN101736691A (en) * | 2008-11-25 | 2010-06-16 | 同济大学 | Fiber reinforce plastic (FRP) ribbing folded plate-concrete combined bridge deck |
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| CN113062216B (en) * | 2021-02-07 | 2022-07-05 | 浙江大学 | Prefabricated assembly type toughness combined bridge deck with cast-in-place wet joint and manufacturing method |
| CN113062217A (en) * | 2021-02-22 | 2021-07-02 | 浙江大学 | Super-high-toughness combined bridge deck for assembly connection of angle steel and profiled steel sheet |
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| CN112195778B (en) | 2022-07-05 |
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