CN103899039A - Steel-concrete composite beam adopting elastic concrete - Google Patents
Steel-concrete composite beam adopting elastic concrete Download PDFInfo
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- CN103899039A CN103899039A CN201410123679.3A CN201410123679A CN103899039A CN 103899039 A CN103899039 A CN 103899039A CN 201410123679 A CN201410123679 A CN 201410123679A CN 103899039 A CN103899039 A CN 103899039A
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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
Abstract
The invention discloses a steel-concrete composite beam adopting elastic concrete. The steel-concrete composite beam comprises a steel beam and a shear connector welded on the steel beam, wherein an elastic concrete slab is poured on the steel beam; the shear connector is arranged in the elastic concrete slab; the elastic concrete slab is formed by pouring and maintaining the elastic concrete. According to the steel-concrete composite beam, the fatigue damage to the concrete slab can be effectively prevented; furthermore, due to the powerful deformability and anti-cracking ability of the elastic concrete, the deformation of the elastic concrete and the shear connector is harmonious, and the fatigue life of the shear connector wrapped in the elastic concrete can be effectively prolonged; meanwhile, the carrying capacity is guaranteed, the construction technology is simplified, and the project popularization can be facilitated.
Description
Technical field
The invention belongs to Steel-concrete Combined Beam Structures, specifically, relate to a kind of steel-concrete composite beam that adopts elastic concrete.
Background technology
The Steel-concrete Combined Beam Structures being made up of girder steel, armored concrete slab and shear connector has more than 90 years in China's developing history, its applied technical field is extensive, comprises the bridge deck structure of Urban Bridge, highway bridge, railroad bridge, long-span arch bridge, suspension bridge and cable stayed bridge in bridge construction; Composite floor system in multi storied factory building superstructure, working platform beam, crane girder, trestle and civilian multi-story and high-rise building in industrial construction.
The loading characteristic of steel-concrete composite beam is bottom steel tension, top concrete compression, its advantage is that bearing capacity is high, stability is strong, good endurance, convenient construction etc., but this kind of combining structure also comes with some shortcomings, it is problem of fatigue damage, fatigue fracture belongs to brittle fracture, and the bearing capacity of this structure and durability are reduced greatly.Find by case history, to bear cyclic reverse loading as main bridge and crane girder structure, its fatigue failure relates to two aspects: upper strata concrete slab produces serious fatigue crack and guarantees the fatigue failure of the cooperative shear connector of Steel concrete (peg).So combined beam structure need to, under the prerequisite that meets its bearing capacity, improve emphatically its fatigue behaviour.
Summary of the invention
What the present invention will solve is that two kinds of fatigue failures often occur traditional steel-concrete composite beam, it is the technical problem of concrete slab fatigue failure and shear connector fatigue fracture, a kind of steel-concrete composite beam that adopts elastic concrete is provided, can effectively prevent the generation of concrete slab fatigue failure, and the deformability that elastic concrete is powerful and cracking resistance, can make itself and shear connector distortion more coordinate, thereby effectively extend the fatigue life of parcel shear connector therein, guarantee supporting capacity simultaneously, simplify construction technology, being beneficial to engineering promotes.
In order to solve the problems of the technologies described above, the present invention is achieved by following technical scheme:
Adopt a steel-concrete composite beam for elastic concrete, comprise girder steel and be welded on the shear connector on described girder steel, on described girder steel, build flexible concrete slab, described shear connector is placed in described elastic concrete plate.
Described elastic concrete plate adopts elastic concrete, and described elastic concrete is mixed by following component by weight:
Wherein, the diameter of rubber grain is 1-2mm.
Preferably, described elastic concrete is mixed by following component by weight:
More preferably, described elastic concrete is mixed by following component by weight:
The invention has the beneficial effects as follows:
The steel-concrete composite beam of employing elastic concrete of the present invention, inherit the advantage of traditional steel-concrete composite beam, go out the bearing capacity of the elastic concrete assurance structure of varying strength by calculating and laboratory adaptation, can effectively solve the problem of fatigue damage of conventional composite beam, thereby greatly improve the durability of compound beam.
The one, aspect the fatigue failure of concrete slab: ordinary concrete and steel combination beam structure are much that this is that its ductility and anti-fatigue performance are poor because ordinary concrete is a kind of fragile material because concrete slab has produced serious crackle so that lost efficacy.And rubber grain in elastic concrete can be regarded the small plasticity unit being uniformly distributed in concrete as, in the time being subject to External Force Acting, rubber grain relies on its stronger elastic deformability to put up a resistance, be interrupted the rubber grain distributing simultaneously and hindered infiltration and development and the perforation in crack in concrete, thereby guaranteed the integrality of elastic concrete plate.Through large-scale general finite element analysis software Ansys and Abaqus analysis and laboratory elastic concrete compressive strength and ess-strain full curve test discovery, the limit tension and compression strain of elastic concrete is all higher than ordinary concrete, and under identical load there is relative ordinary concrete evening in elastic concrete crackle, crack distribution evenly and disperse, there is not mortality crackle, detect and find that elastic concrete has good energy dissipation function by acoustic emission equipment simultaneously, damage Evolution Rates is slow, and be premonitory before destroying, more approach plasticity with respect to ordinary concrete, be suitable for very much bearing fatigue loading.
The 2nd, aspect the fatigue failure of shear connector, be to be stressed in combined beam structure Elastic concrete part, with respect to " fragility " of ordinary concrete, elastic concrete can bear larger distortion, absorb more strain energies, with steel plate and shear connector collaborative work, ductility is good.Process large-scale general finite element analysis software Ansys and Abaqus analyze and structural test is found simultaneously, slippage between steel and elastic concrete is greater than the slippage between steel and ordinary concrete, and the former is approximately 1.2-1.7 times of the latter, be that the elastic concrete flexibility that limits of the present invention is larger, be combined better with shear connector.Simultaneously by fatigue test and finite element analysis checking, adopt be also improved greatly the fatigue life of shear connector after this kind of elastic concrete.Shear connector can be planted therewith elastic concrete and be acted synergistically, because elastic concrete crackle occurs more late, and can keep integrality while destruction, make identical stressed under, in the time that shear connector ordinary concrete around has destroyed, and elastic concrete can continue survival, wrap shear connector, the stress value in shear connector maximum weighted region is reduced.According to stress amplitude life curve (S-N) theory, increase the fatigue life of shear connector with respect to ordinary concrete compound beam, finds that according to test life-span of shear connector can improve 1.3-2.0 doubly, and effect is remarkable.
In addition due to the elastic concrete that has adopted the present invention to limit, anti-wear performance, ageing resistace, water permeability resistance, anti-freezing property, corrosion resistance, anti-spalling, sound absorbing capabilities, heat conductivity and the refractoriness on compound beam surface are improved, can make like this concrete repair rate on compound beam surface greatly reduce, and reduce noise pollution; A new way that simultaneously realizes resource recycling, reduces the environment pollution that a large amount of waste tires cause; Except adding in proportion rubber in the time configuring concrete, its work progress does not increase difficulty, is beneficial to engineering and promotes.
Accompanying drawing explanation
Fig. 1 is the structural representation of the steel-concrete composite beam of employing elastic concrete provided by the present invention;
Fig. 2 is the sectional view of the steel-concrete composite beam of employing elastic concrete provided by the present invention.
In figure: 1: elastic concrete plate; 2: girder steel; 3: shear connector.
The specific embodiment
Below by specific embodiment, the present invention is described in further detail:
Following examples can make those skilled in the art more fully understand the present invention, but do not limit the present invention in any way.
Wherein each embodiment all selects the rubber crumbs (1-2mm diameter) that Tianjin Ke Wei rubber plant produces; The Camel P.O42.5 Portland cement that cement plant, Tianjin produces.Above-mentioned brand is not necessarily specified in selecting of rubber grain and cement, and rubber grain diameter meets the demands.In addition, cement, sand, stone and water reducing agent are the material adopting in common engineering, there is no specific (special) requirements.There is not specific (special) requirements in girder steel and shear connector part, is the material generally adopting in engineering yet.
As depicted in figs. 1 and 2, adopt the steel-concrete composite beam of elastic concrete mainly to be formed by three parts, be respectively elastic concrete plate 1, girder steel 2 and shear connector 3.Shear connector 3 is welded on girder steel 2, and girder steel 2 is built elastic concrete above and formed elastic concrete plate 1, makes shear connector 3 be placed in elastic concrete, to guarantee elastic concrete and girder steel 2 collaborative works.
This steel-concrete composite beam according to " Code for design of steel structures " (GB50017-2003) in method for designing in Steel concrete compound beam one joint carry out the design of Cross section Design and shearing resistance peg, its bearing capacity calculation, amount of deflection checking computations, crack resisting calculation and construction measure must meet existing national standard " Code for design of steel structures " (GB50017-2003) with " Code for design of concrete structures " (GB50010-2010).
Elastic concrete is that a kind of composition material using rubber grain as cement concrete configures the new concrete forming, wherein flexible composition is mainly derived from waste rubber goods, take junked tire as main, it is a kind of environmentally friendly green material, there is powerful anti-wear performance, sound absorbing capabilities, deformability and cracking resistance, and significantly strengthen with respect to ordinary concrete fatigue behaviour.It is low that the weakness of existing elastic concrete maximum is compressive strength ordinary concrete relative to modulus of elasticity.The elastic concrete compressive strength that steel-concrete composite beam of the present invention adopts and modulus of elasticity are all higher through test, comparatively approach ordinary concrete, and slump are higher, are applicable to engineering application.Through stress-strain curve, experiment is found, the limit tension and compression strain of elastic concrete is all higher than ordinary concrete, and under identical load there is relative ordinary concrete evening in elastic concrete crackle, crack distribution evenly and disperse, there is not mortality crackle, detect and find that elastic concrete has good energy dissipation function by acoustic emission equipment simultaneously, damage Evolution Rates is slow, and be premonitory before destroying, fragility with respect to ordinary concrete more approaches plasticity, is suitable for very much bearing fatigue loading.
The elastic concrete that the present embodiment adopts is stirred and is formed by concrete mixer by cement, stone, sand, water, water reducing agent and rubber grain.Making optimal resilience concrete by concrete cube compression test, is 100 parts of rubber grains, 590 parts of cement, 1230 parts, stone, 412 parts of sands, 168 parts, water, 7 parts of water reducing agents according to weight portion, and wherein the diameter of rubber grain is 1-2mm.
The cubic compressive strength that records elastic concrete that the present embodiment adopts through overtesting can reach 46.3MPa, and modulus of elasticity is 2.183E+4, and the slump exceedes 100mm, applicable engineering application.
Test by compound beam and finite element checking is found simultaneously, the steel-concrete composite beam of the present embodiment, the slippage between its steel and elastic concrete is 1.7 times of slippage between steel and ordinary concrete, and the former combination ability is stronger, and flexibility is larger.Fatigue test is simultaneously found to have adopted after this elastic concrete, and be 2.0 times of ordinary concrete compound beam life-span the fatigue life of steel-concrete composite beam, and effect is very obvious.
The cubic compressive strength that records elastic concrete that the present embodiment adopts through overtesting can reach 45.1MPa, and modulus of elasticity is 2.790E+4, and the slump exceedes 100mm, applicable engineering application.
Test by compound beam and finite element checking is found simultaneously, the steel-concrete composite beam of the present embodiment, the slippage between its steel and elastic concrete is 1.2 times of slippage between steel and ordinary concrete, and the former combination ability is stronger, and flexibility is larger.Fatigue test is simultaneously found to have adopted after this elastic concrete, and be 1.3 times of ordinary concrete compound beam life-span the fatigue life of steel-concrete composite beam, and effect is comparatively obvious.
The cubic compressive strength that records elastic concrete that the present embodiment adopts through overtesting can reach 38.5MPa, and modulus of elasticity is 1.445E+4, and the slump is 90mm, is still applicable to engineering application.
Test by compound beam and finite element checking is found simultaneously, the steel-concrete composite beam of the present embodiment, the slippage between its steel and elastic concrete is 1.4 times of slippage between steel and ordinary concrete, and the former combination ability is stronger, and flexibility is larger.Fatigue test is simultaneously found to have adopted after this elastic concrete, and be 1.7 times of ordinary concrete compound beam life-span the fatigue life of steel-concrete composite beam, successful.
The cubic compressive strength that records elastic concrete that the present embodiment adopts through overtesting can reach 46.0MPa, and modulus of elasticity is 2.302E+4, and the slump exceedes 100mm, applicable engineering application.
Test by compound beam and finite element checking is found simultaneously, the steel-concrete composite beam of the present embodiment, the slippage between its steel and elastic concrete is 1.6 times of slippage between steel and ordinary concrete, and the former combination ability is stronger, and flexibility is larger.Fatigue test is simultaneously found to have adopted after this elastic concrete, and be 1.9 times of ordinary concrete compound beam life-span the fatigue life of steel-concrete composite beam, successful.
Embodiment 5
Embodiment 5 is only with the difference of embodiment 1, the elastic concrete that adopts formed by 8 parts of 110 parts of rubber grains, 575 parts of cement, 1215 parts, stone, 450 parts of sands, 167 parts, water, water reducing agent according to weight portion.
The cubic compressive strength that records elastic concrete that the present embodiment adopts through overtesting can reach 43.0MPa, and modulus of elasticity is 1.901E+4, and the slump is 100mm, is applicable to engineering application.
Test by compound beam and finite element checking is found simultaneously, the steel-concrete composite beam of the present embodiment, the slippage between its steel and elastic concrete is 1.5 times of slippage between steel and ordinary concrete, and the former combination ability is stronger, and flexibility is larger.Fatigue test is simultaneously found to have adopted after this elastic concrete, and be 1.8 times of ordinary concrete compound beam life-span the fatigue life of steel-concrete composite beam, successful.
Comprehensive above-described embodiment is found, five embodiment are all better than ordinary concrete and steel combination beam at combined effect in varying degrees, wherein optimum scheme is embodiment mono-: weight portion is 100 parts of rubber grains, 590 parts of cement, 1230 parts, stone, 412 parts of sands, 168 parts, water, 7 parts of water reducing agents, slippage between its steel and elastic concrete is 1.7 times of slippage between steel and ordinary concrete, flexibility is very large, and the fatigue life of elastic concrete and steel combination beam be 2.0 times of ordinary concrete and steel combination beam life-span, effect is very obvious.
Although by reference to the accompanying drawings the preferred embodiments of the present invention are described above; but the present invention is not limited to the above-mentioned specific embodiment; the above-mentioned specific embodiment is only schematic; be not restrictive; those of ordinary skill in the art is under enlightenment of the present invention; not departing from the scope situation that aim of the present invention and claim protect, can also make the concrete conversion of a lot of forms, within these all belong to protection scope of the present invention.
Claims (4)
1. adopt a steel-concrete composite beam for elastic concrete, comprise girder steel and be welded on the shear connector on described girder steel, it is characterized in that, on described girder steel, build flexible concrete slab, described shear connector is placed in described elastic concrete plate.
2. a kind of steel-concrete composite beam that adopts elastic concrete according to claim 1, is characterized in that, described elastic concrete plate adopts elastic concrete, and described elastic concrete is mixed by following component by weight:
Wherein, the diameter of rubber grain is 1-2mm.
3. a kind of steel-concrete composite beam that adopts elastic concrete according to claim 2, is characterized in that, described elastic concrete is mixed by following component by weight:
4. a kind of steel-concrete composite beam that adopts elastic concrete according to claim 3, is characterized in that, described elastic concrete is mixed by following component by weight:
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| CN201410123679.3A CN103899039A (en) | 2014-03-28 | 2014-03-28 | Steel-concrete composite beam adopting elastic concrete |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104343203A (en) * | 2014-11-04 | 2015-02-11 | 福州大学 | Novel combined beam structure based on steel-ultra-high property concrete |
| CN104609803A (en) * | 2015-01-29 | 2015-05-13 | 天津大学 | Rubber-particle cement-based material joint filler for concrete pavement and construction method thereof |
| CN104727226A (en) * | 2015-02-15 | 2015-06-24 | 中交第一公路工程局有限公司 | Construction method for steel-concrete composite girder |
| CN106767667A (en) * | 2017-01-24 | 2017-05-31 | 广西交通科学研究院有限公司 | Using the appraisal procedure of the steel-concrete combination beam fatigue additional deformation of Welded-Stud Conectors |
| US11299886B2 (en) * | 2019-04-24 | 2022-04-12 | Protectiflex, LLC | Composite stud wall panel assembly |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104343203A (en) * | 2014-11-04 | 2015-02-11 | 福州大学 | Novel combined beam structure based on steel-ultra-high property concrete |
| CN104609803A (en) * | 2015-01-29 | 2015-05-13 | 天津大学 | Rubber-particle cement-based material joint filler for concrete pavement and construction method thereof |
| CN104727226A (en) * | 2015-02-15 | 2015-06-24 | 中交第一公路工程局有限公司 | Construction method for steel-concrete composite girder |
| CN104727226B (en) * | 2015-02-15 | 2017-01-25 | 中交第一公路工程局有限公司 | Construction method for steel-concrete composite girder |
| CN106767667A (en) * | 2017-01-24 | 2017-05-31 | 广西交通科学研究院有限公司 | Using the appraisal procedure of the steel-concrete combination beam fatigue additional deformation of Welded-Stud Conectors |
| CN106767667B (en) * | 2017-01-24 | 2019-03-22 | 广西大学 | Using the appraisal procedure of the steel-concrete composite beam fatigue additional deformation of Welded-Stud Conectors |
| US11299886B2 (en) * | 2019-04-24 | 2022-04-12 | Protectiflex, LLC | Composite stud wall panel assembly |
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Application publication date: 20140702 |