CN109706854B - Sandwich type top and bottom plate shear-resistant reinforced concrete slab beam structure - Google Patents
Sandwich type top and bottom plate shear-resistant reinforced concrete slab beam structure Download PDFInfo
- Publication number
- CN109706854B CN109706854B CN201910108602.1A CN201910108602A CN109706854B CN 109706854 B CN109706854 B CN 109706854B CN 201910108602 A CN201910108602 A CN 201910108602A CN 109706854 B CN109706854 B CN 109706854B
- Authority
- CN
- China
- Prior art keywords
- concrete slab
- concrete
- slab beam
- layer
- reinforced
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000011150 reinforced concrete Substances 0.000 title claims description 24
- 239000004567 concrete Substances 0.000 claims abstract description 140
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 40
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 24
- 239000010959 steel Substances 0.000 claims abstract description 24
- 238000013461 design Methods 0.000 claims abstract description 23
- 239000000463 material Substances 0.000 claims abstract description 19
- 230000002787 reinforcement Effects 0.000 claims description 42
- 230000010354 integration Effects 0.000 claims description 33
- 238000000034 method Methods 0.000 claims description 32
- 239000002986 polymer concrete Substances 0.000 claims description 4
- 239000004574 high-performance concrete Substances 0.000 claims description 2
- 238000007788 roughening Methods 0.000 claims description 2
- 238000010008 shearing Methods 0.000 abstract description 4
- 239000011513 prestressed concrete Substances 0.000 abstract description 3
- 238000005728 strengthening Methods 0.000 abstract description 3
- 230000006835 compression Effects 0.000 abstract description 2
- 238000007906 compression Methods 0.000 abstract description 2
- 238000010276 construction Methods 0.000 description 9
- 239000011374 ultra-high-performance concrete Substances 0.000 description 7
- 238000005336 cracking Methods 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229920000049 Carbon (fiber) Polymers 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000004917 carbon fiber Substances 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 238000000338 in vitro Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Rod-Shaped Construction Members (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The present disclosure provides a sandwich roof and floor shear strengthening concrete slab beam structure, comprising: a concrete slab beam; the bottom surface of the top concrete integrated layer is fixedly connected with the top surface of the concrete slab beam, the standard value of compressive strength of the top concrete integrated layer is more than or equal to 60MPa, and the top surface of the concrete slab beam is fully reinforced, and the thickness of the top concrete integrated layer is 50-150 mm; the top surface of the bottom reinforcing layer is fixedly connected with the bottom surface of the concrete slab beam, the design value of the tensile strength of the bottom reinforcing layer is more than or equal to 15MPa, the bottom surface of the concrete slab beam is reinforced in the whole width or partial width along the length direction of the beam, and the thickness of the bottom reinforcing layer is 8-50 mm. The anti-shearing bearing capacity of the structure can be greatly improved by fully exerting the compression resistance and tensile resistance of the materials of the top concrete integral layer and the bottom reinforcing layer of the concrete slab beam respectively, and the problem that the in-service steel bars and the prestressed concrete slab beam bridge are low in design load level and insufficient in shearing bearing capacity can be effectively solved.
Description
Technical Field
The disclosure relates to the field of bridge reinforcement, in particular to a sandwich type top and bottom plate shear-resistant reinforced concrete slab beam structure.
Background
The concrete slab beam has the advantages of simple prefabrication, convenient installation, low manufacturing cost and the like, and is widely applied to small and medium-span bridges. However, with the development of national economy and heavy traffic vehicles, the reinforced concrete and prestressed concrete slab bridge in service in China have the defects of insufficient shearing bearing capacity, concrete cracking, steel bar corrosion, hinge joint connection failure and the like. These diseases, especially the insufficient shear bearing capacity, seriously affect the service life of the vehicle, and bring about huge traffic safety hidden trouble.
For concrete slab beams with insufficient shear capacity, it is common practice to dismantle them and replace them with new beams with reinforced sections and high heights. However, the method of replacing the new beam not only has a long reconstruction and expansion period, consumes a large amount of reinforced concrete materials and increases a large amount of construction cost, but also causes a large amount of construction waste in the dismantled concrete slab beam, thereby bringing serious environmental protection problems. Therefore, the method for reinforcing the existing concrete slab beam is an effective way for saving energy and protecting environment.
At present, the shear strengthening method of the concrete slab beam comprises a cross section increasing method, a surface pasting method, an external prestress and system strengthening changing method and the like. The traditional method for increasing the cross section can obviously reduce the net height under the bridge and increase the dead weight of the structure. The method for pasting the carbon fiber cloth has the problems of ageing and peeling of the adhesive, poor fire resistance of the carbon fiber cloth and the like. The problems of complex reinforcement process and the like exist when in vitro prestress and a system reinforcement method is changed. In recent years, the common concrete beam is reinforced by adopting ultra-high performance concrete abroad, but the ultra-high performance concrete is only applied in a tension zone in the method, and the shearing bearing capacity of the ultra-high performance concrete is limited in improvement range. Meanwhile, the problems of high cost of the ultra-high performance concrete, difficult construction and maintenance of the bottom of the beam and the like exist.
Therefore, development of a novel structure for reinforcing the shear bearing capacity of the concrete slab beam, which is high in efficiency, low in manufacturing cost, convenient to construct and environment-friendly, is needed.
Disclosure of Invention
First, the technical problem to be solved
The present disclosure provides a sandwich-type roof-floor shear-reinforced concrete slab beam structure to at least partially address the above-identified technical problems.
(II) technical scheme
According to one aspect of the present disclosure, there is provided a sandwich-type roof-to-floor shear-reinforced concrete slab beam structure comprising:
a concrete slab beam;
a top concrete integration layer, the bottom surface of which is consolidated with the top surface of the concrete slab beam;
and the top surface of the bottom reinforcing layer is fixedly connected with the bottom surface of the concrete slab beam.
In some embodiments, the top concrete integration layer is fully reinforced on the top surface of the concrete slab beam, the thickness is 50-150 mm, and the compressive strength standard value is more than or equal to 60MPa.
In some embodiments, the concrete slab beam structure further comprises:
the steel bar net piece, the steel bar net piece sets up in the middle of the top concrete integration layer along the length direction level of roof beam, the steel bar net piece diameter is 8 ~ 12mm, with horizontal vertical 100 ~ 150 mm's interval set up in the intermediate position of top concrete integration layer thickness direction level.
In some embodiments, the bottom reinforcement layer is reinforced at the bottom surface of the concrete slab beam in the whole width or partial part along the length direction of the beam, the thickness is 8-50 mm, and the design value of the tensile strength is more than or equal to 15MPa.
In some embodiments, when the design value of the tensile strength of the bottom reinforcing layer is less than or equal to 20MP and the thickness of the bottom reinforcing layer is more than or equal to 40mm, the bottom reinforcing layer is provided with reinforcing mesh pieces with the diameter of 8mm and the interval of 100-150 mm at the middle position in the thickness direction.
In some embodiments, the bottom reinforcement layer is modified polymer concrete with a thickness of 30-50 mm or steel plate with a thickness of 8-16 mm;
the top concrete integration layer adopts an ultra-high performance concrete material containing coarse aggregate, and the proportion is as follows:
copper-plated steel fiber: length is 12-16 mm, diameter is 0.18-0.22 mm,
Tensile strength is more than or equal to 2000MPa,80 kg/m to 240kg/m 3 ；
High-efficiency water reducer: 15-40 kg/m 3 ；
Water: 165-200 kg/m 3 。
In some embodiments, the concrete slab beam structure further comprises:
the longitudinal steel bars are horizontally arranged in the concrete slab beam along the length direction of the beam;
and the stirrups are vertically arranged in the concrete slab beam.
In some embodiments, the method for calculating the shear bearing capacity of the sandwich-type concrete slab beam structure with the shear reinforced top and bottom plates comprises the following steps:
in the method, in the process of the invention,
V R -the total shear load capacity of the reinforced concrete slab beam structure;
α 1 、α 2 、α 3 -coefficient of influence of different types of beams;
b 1 -reinforcing the width of the front concrete slab beam, top concrete integration layer;
b 2 -the total width of the bottom reinforcing layer;
h 1 -reinforcing the height of the front concrete slab beam;
h 2 -the height of the bottom reinforcement layer;
h 3 -the height of the top concrete integration layer;
beta-the compressive strength enhancement factor of the top concrete integration layer;
P 1 -reinforcing the front concrete slab beam at an inclineThe reinforcement percentage of the longitudinal tension steel bars in the section;
P 2 the bottom reinforcing layer is equivalent to the reinforcement percentage of the longitudinal tension reinforcement in the inclined section;
f cu,k -standard values of concrete compressive strength (MPa) for reinforcing the front concrete slab beam;
f top, k -a concrete compressive strength standard value (MPa) of the top concrete integration layer;
f bottom -design value of tensile strength (MPa) of the bottom reinforcement layer;
ρ sv -the reinforcement ratio of the stirrups in the inclined section;
f sv -design value of tensile strength (MPa) of stirrups;
f s -design value of tensile strength (MPa) of the longitudinal bars.
In some embodiments, the concrete slab beam structure further comprises:
the embedded bars are vertically arranged between the bottom surface of the top concrete integrated layer and the top surface of the concrete slab beam, the distance between the embedded bars along the length direction of the beam is 300-500 mm, the distance along the transverse direction of the beam is 200-300 mm, and the diameter is 8-12 mm.
In some embodiments, the top and bottom surface concrete of the concrete slab beam is roughened to expose concrete coarse aggregate, with a treatment thickness of 10-20 mm.
(III) beneficial effects
According to the technical scheme, the sandwich type top-bottom plate shear-resistant reinforced concrete slab beam structure has at least one of the following beneficial effects:
(1) The method can fully exert the compression resistance and tensile resistance of the materials of the top concrete integrated layer and the bottom reinforcing layer of the concrete slab beam respectively, greatly improve the shear bearing capacity of the structure, and can effectively solve the problems of low design load level and insufficient shear bearing capacity of in-service steel bars and prestressed concrete slab beam bridges;
(2) The compressive strength standard value of the material of the top concrete integration layer is more than or equal to 60MPa, the material can be an ultra-high performance concrete material containing coarse aggregate, the compressive strength is high, the shear bearing capacity is high, the construction does not need steam curing, and the construction period is short; in addition, the top concrete integrated layer can improve the cracking resistance and the shock resistance of the existing concrete slab beam top plate, reduce the cracking and the local damage phenomena of the bridge deck top plate and greatly improve the durability of the bridge;
(3) The design value of the tensile strength of the material of the bottom reinforcing layer is more than or equal to 15MPa, modified Polymer Concrete (MPC) with the thickness of 30-50 mm or steel plates with the thickness of 8-16 mm can be adopted, the thickness of the bottom reinforcing layer is thin, the construction is convenient, the construction period is short, and the clearance requirement under a beam can be effectively ensured. In addition, the bottom reinforcing layer can improve the cracking resistance of the existing concrete slab beam bottom plate, reduce the cracking and local damage phenomena of the bridge floor bottom plate and greatly improve the durability of the bridge.
(4) The method for calculating the total shear bearing capacity of the reinforced concrete slab beam has the advantages of clear concept, practicality, convenience, strong operability and effective method for the design of the reinforced concrete slab beam;
(5) The shear supporting device has the advantages of high shear supporting capacity improving efficiency, low manufacturing cost, simple design, convenient construction, green environmental protection, good economy, good durability, wide applicability and the like.
Drawings
Fig. 1 (a) is a schematic longitudinal cross-sectional view of a concrete slab beam reinforcing structure according to an embodiment of the present disclosure.
Fig. 1 (b) is a schematic cross-sectional view of a concrete slab beam reinforcement structure with a single locally reinforced bottom reinforcement layer according to an embodiment of the present disclosure.
Fig. 1 (c) is a schematic cross-sectional view of a concrete slab beam reinforcing structure with three partially reinforced bottom reinforcing layers according to an embodiment of the present disclosure.
Fig. 2 (a) is an exploded schematic view of a method for calculating shear bearing capacity of a reinforced concrete slab beam structure with a single locally reinforced bottom reinforcement layer of a high-toughness material according to an embodiment of the present disclosure.
Fig. 2 (b) is an exploded schematic view of a method for calculating shear bearing capacity of a reinforced concrete slab beam structure with three partially reinforced bottom reinforcement layers of high-toughness materials according to an embodiment of the disclosure.
[ in the drawings, the main reference numerals of the embodiments of the present disclosure ]
1. A concrete slab beam;
101. longitudinal steel bars; 102. stirrups;
2. a top concrete integration layer;
201. reinforcing steel bar meshes;
3. a bottom reinforcement layer; 4. reinforced bar
Detailed Description
The present disclosure provides a sandwich-type roof-floor shear-reinforced concrete slab beam structure. For the purposes of promoting an understanding of the principles and advantages of the disclosure, reference will now be made to the embodiments illustrated in the drawings and specific language will be used to describe the same.
Certain embodiments of the present disclosure will now be described more fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments are shown. Indeed, various embodiments of the disclosure may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will satisfy applicable legal requirements.
Fig. 1 (a) is a schematic longitudinal cross-sectional view of a sandwich-type roof-to-floor shear-reinforced concrete slab beam structure according to an embodiment of the present disclosure. Comprising the following steps: the concrete slab beam 1, the top concrete integrated layer 2, the bottom reinforcing layer 3, longitudinal steel bars 101 of the concrete slab beam 1, hoops 102 of the concrete slab beam 1, steel bar meshes 201 of the top concrete integrated layer and the embedded steel bars 4.
Wherein the bottom surface of the top concrete integration layer 2 is fixedly connected with the top surface of the concrete slab beam 1, and the top surface of the bottom reinforcement layer 3 is fixedly connected with the bottom surface of the concrete slab beam 1. The longitudinal steel bar 101 is horizontally arranged at the bottom of the concrete slab beam 1 along the length direction of the beam, the stirrup 102 is arranged in the main body of the concrete slab beam 1 along the vertical bridge axis in the circumferential direction of the concrete slab beam 1, the steel bar net sheet 201 is horizontally arranged in the middle of the top concrete integration layer 2 along the length direction of the beam, and the steel bar planting 4 is arranged between the bottom surface of the top concrete integration layer 2 and the top surface of the concrete slab beam 1.
The following describes in detail the respective parts of the sandwich-type roof-floor shear-reinforced concrete slab beam structure of this embodiment.
Specifically, the concrete slab beam 1 may have a hollow structure along the length direction of the beam, and the hollow structure may have a rectangular parallelepiped shape or the like.
The top concrete integration layer 2 is made of high-performance concrete materials, the standard value of the compressive strength of the materials is more than or equal to 60MPa, the materials are all reinforced on the top surface of the concrete slab beam 1, the thickness is 50-150 mm, and the middle position in the thickness direction is provided with reinforcing steel meshes 201 with the diameters of 8-12 mm and the spacing of 100-150 mm.
Further, the top concrete integration layer 2 may be made of ultra-high performance concrete material containing coarse aggregate, and the proportion thereof is as follows:
copper-plated steel fiber: length is 12-16 mm, diameter is 0.18-0.22 mm,
Tensile strength is more than or equal to 2000MPa,80 kg/m to 240kg/m 3 ；
High-efficiency water reducer: 15-40 kg/m 3 ；
Water: 165-200 kg/m 3 。
The bottom reinforcing layer 3 is made of high-toughness materials, the design value of the tensile strength of the materials is more than or equal to 15MPa, the bottom surface of the concrete slab beam is reinforced in the whole width or partial width range along the length direction of the beam, and the thickness of the bottom reinforcing layer is 8-50 mm.
Fig. 1 (b) is a schematic cross-sectional view of a concrete slab beam reinforcement structure with a single locally reinforced bottom reinforcement layer according to an embodiment of the present disclosure. In figure b 1 The width of the integrated layer of the top concrete for reinforcing the front concrete slab beam; b 2 Is the total width of the bottom reinforcing layer; in this embodiment, b 1 ＝2*b 2 I.e. a single strip with a local reinforcement width of about 0.5 times the width of the beam bottom.
FIG. 1 (c) is a schematic cross-sectional view of a concrete slab beam reinforcing structure with three locally reinforced bottom reinforcing layers according to an embodiment of the present disclosureA drawing. In figure b 1 The width of the integrated layer of the top concrete for reinforcing the front concrete slab beam; b 2 Is the total width of the bottom reinforcing layer;in this embodiment, n=3.
Fig. 2 (a) is an exploded schematic view of a method for calculating shear bearing capacity of a reinforced concrete slab beam structure with a single locally reinforced bottom reinforcement layer of a high-toughness material according to an embodiment of the present disclosure. Wherein h is 1 To strengthen the height of the front concrete slab beam; h is a 2 The height of the bottom reinforcement layer; h is a 3 To the height of the top concrete integration layer.
Fig. 2 (b) is an exploded schematic view of a method for calculating shear bearing capacity of a reinforced concrete slab beam structure with three locally reinforced bottom reinforcement layers of high-toughness materials according to an embodiment of the disclosure. Wherein h is 1 To strengthen the height of the front concrete slab beam; h is a 2 The height of the bottom reinforcement layer; h is a 3 To the height of the top concrete integration layer.
When the design value of the tensile strength of the bottom reinforcing layer 3 is less than or equal to 20MP and the thickness is more than or equal to 40mm, the middle position in the thickness direction is provided with reinforcing steel meshes with the diameter of 8mm and the interval of 100-150 mm.
Further, the bottom reinforcement layer 3 may be a Modified Polymer Concrete (MPC) having a thickness of 30 to 50mm or a steel plate having a thickness of 8 to 16 mm.
The method for calculating the shear bearing capacity of the sandwich type top-bottom plate shear reinforced concrete slab beam structure comprises the following steps:
in the method, in the process of the invention,
V R -the total shear load capacity of the reinforced concrete slab beam structure;
α 1 、α 2 、α 3 -coefficient of influence of different types of beams;
b 1 -reinforcing the width of the front concrete slab beam, top concrete integration layer;
b 2 -the total width of the bottom reinforcing layer;
h 1 -reinforcing the height of the front concrete slab beam;
h 2 -the height of the bottom reinforcement layer;
h 3 -the height of the top concrete integration layer;
beta-the compressive strength enhancement factor of the top concrete integration layer;
P 1 -the reinforcement percentage of the longitudinal tension reinforcement of the reinforced front concrete slab beam in the inclined section;
P 2 the bottom reinforcing layer is equivalent to the reinforcement percentage of the longitudinal tension reinforcement in the inclined section;
f cu,k -standard values of concrete compressive strength (MPa) for reinforcing the front concrete slab beam;
f top, k -a concrete compressive strength standard value (MPa) of the top concrete integration layer;
f bottom -design value of tensile strength (MPa) of the bottom reinforcement layer;
ρ sv -the reinforcement ratio of the stirrups in the inclined section;
f sv -design value of tensile strength (MPa) of stirrups;
f s -design value of tensile strength (MPa) of the longitudinal bars.
Preferably, in the sandwich type top-bottom plate shear-resistant reinforced concrete slab beam structure, the overall performance between the top concrete integration layer 2 and the concrete slab beam 1 can be further improved by means of the embedded ribs 4, the distance between the embedded ribs 4 along the axis direction of the beam is 300-500 mm, the distance between the embedded ribs 4 along the axis direction of the beam and the axis direction of a vertical bridge is 200-300 mm, and the diameter is 8-12 mm.
It is further preferred that the top and bottom surface concrete of the concrete slab beam 1 is subjected to a roughening treatment to expose hard concrete coarse aggregate, typically with a treatment thickness of 10-20 mm.
Thus, embodiments of the present disclosure have been described in detail with reference to the accompanying drawings. It should be noted that, in the drawings or the text of the specification, implementations not shown or described are all forms known to those of ordinary skill in the art, and not described in detail. Furthermore, the above definitions of the elements and methods are not limited to the specific structures, shapes or modes mentioned in the embodiments, and may be simply modified or replaced by those of ordinary skill in the art.
It should be further noted that, the directional terms mentioned in the embodiments, such as "upper", "lower", "front", "rear", "left", "right", etc., are only referring to the directions of the drawings, and are not intended to limit the scope of the present disclosure. Like elements are denoted by like or similar reference numerals throughout the drawings. Conventional structures or constructions will be omitted when they may cause confusion in understanding the present disclosure.
And the shapes and dimensions of the various elements in the drawings do not reflect actual sizes and proportions, but merely illustrate the contents of the embodiments of the present disclosure. In addition, in the claims, any reference signs placed between parentheses shall not be construed as limiting the claim.
Unless otherwise known, numerical parameters in this specification and the appended claims are approximations that may vary depending upon the desired properties sought to be obtained by the present disclosure. In particular, all numbers expressing quantities of ingredients, reaction conditions, and so forth used in the specification and claims are to be understood as being modified in all instances by the term "about". In general, the meaning of expression is meant to include a variation of + -10% in some embodiments, a variation of + -5% in some embodiments, a variation of + -1% in some embodiments, and a variation of + -0.5% in some embodiments by a particular amount.
Furthermore, the word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements.
Furthermore, unless specifically described or steps must occur in sequence, the order of the above steps is not limited to the list above and may be changed or rearranged according to the desired design. In addition, the above embodiments may be mixed with each other or other embodiments based on design and reliability, i.e. the technical features of the different embodiments may be freely combined to form more embodiments.
Those skilled in the art will appreciate that the modules in the apparatus of the embodiments may be adaptively changed and disposed in one or more apparatuses different from the embodiments. The modules or units or components of the embodiments may be combined into one module or unit or component and, furthermore, they may be divided into a plurality of sub-modules or sub-units or sub-components. Any combination of all features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or units of any method or apparatus so disclosed, may be used in combination, except insofar as at least some of such features and/or processes or units are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. Also, in the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware.
Similarly, it should be appreciated that in the above description of exemplary embodiments of the disclosure, various features of the disclosure are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various disclosed aspects. However, the disclosed method should not be construed as reflecting the intention that: i.e., the claimed disclosure requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this disclosure.
While the foregoing embodiments have been described in some detail for purposes of clarity of understanding, it will be understood that the foregoing embodiments are merely illustrative of the invention and are not intended to limit the invention, and that any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the present disclosure are intended to be included within the scope of the present disclosure.
Claims (7)
1. A sandwich-type roof-to-floor shear-reinforced concrete slab beam structure comprising:
a concrete slab beam;
the top concrete integration layer, the bottom surface of top concrete integration layer with the top surface of concrete slab roof beam is consolidated, top concrete integration layer adopts the super high performance concrete material that contains coarse aggregate, and its ratio is:
the top surface of the bottom reinforcing layer is fixedly connected with the bottom surface of the concrete slab beam, and the bottom reinforcing layer is made of modified polymer concrete with the thickness of 30-50 mm;
the concrete slab beam structure further comprises:
the longitudinal steel bars are horizontally arranged in the concrete slab beam along the length direction of the beam;
the stirrups are vertically arranged in the concrete slab beam;
wherein,
the method for calculating the shear bearing capacity of the sandwich type top-bottom plate shear reinforced concrete slab beam structure comprises the following steps:
in the method, in the process of the invention,
V R -the total shear load capacity of the reinforced concrete slab beam structure;
α 1 、α 2 、α 3 -coefficient of influence of different types of beams;
b 1 -reinforcing the width of the front concrete slab beam, top concrete integration layer;
b 2 -the total width of the bottom reinforcing layer;
h 1 -reinforcing the height of the front concrete slab beam;
h 2 -the height of the bottom reinforcement layer;
h 3 -the height of the top concrete integration layer;
beta-the compressive strength enhancement factor of the top concrete integration layer;
P 1 -the reinforcement percentage of the longitudinal tension reinforcement of the reinforced front concrete slab beam in the inclined section;
P 2 the bottom reinforcing layer is equivalent to the reinforcement percentage of the longitudinal tension reinforcement in the inclined section;
f cu,k -standard values of concrete compressive strength (MPa) for reinforcing the front concrete slab beam;
f top, k -a concrete compressive strength standard value (MPa) of the top concrete integration layer;
f bottom -design value of tensile strength (MPa) of the bottom reinforcement layer;
ρ sv -the reinforcement ratio of the stirrups in the inclined section;
f sv -design value of tensile strength (MPa) of stirrups;
f s -design value of tensile strength (MPa) of the longitudinal bars.
2. The concrete slab beam structure according to claim 1, wherein the top concrete integration layer is fully reinforced on the top surface of the concrete slab beam, has a thickness of 50-150 mm, and has a compressive strength standard value of not less than 60MPa.
3. The concrete slab beam structure of claim 2, further comprising:
the steel bar net piece, the steel bar net piece sets up in the middle of the top concrete integration layer along the length direction level of roof beam, the steel bar net piece diameter is 8 ~ 12mm, with horizontal vertical 100 ~ 150 mm's interval set up in the intermediate position of top concrete integration layer thickness direction level.
4. The concrete slab beam structure according to claim 1, wherein the bottom reinforcement layer is reinforced at the bottom surface of the concrete slab beam in the whole width or part along the length direction of the beam, the thickness is 8-50 mm, and the design value of the tensile strength is more than or equal to 15MPa.
5. The concrete slab beam structure according to claim 4, wherein when the design value of the tensile strength of the bottom reinforcement layer is equal to or less than 20MP and the thickness thereof is equal to or more than 40mm, the bottom reinforcement layer is provided with reinforcing mesh pieces with a diameter of 8mm and a spacing of 100-150 mm at the middle position in the thickness direction.
6. The concrete slab beam structure of claim 1, further comprising:
the embedded bars are vertically arranged between the bottom surface of the top concrete integrated layer and the top surface of the concrete slab beam, the distance between the embedded bars along the length direction of the beam is 300-500 mm, the distance along the transverse direction of the beam is 200-300 mm, and the diameter is 8-12 mm.
7. The concrete slab beam structure according to claim 1, wherein the top and bottom surface concrete of the concrete slab beam is subjected to a roughening treatment to expose concrete coarse aggregate, the treatment thickness being 10 to 20mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910108602.1A CN109706854B (en) | 2019-02-02 | 2019-02-02 | Sandwich type top and bottom plate shear-resistant reinforced concrete slab beam structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910108602.1A CN109706854B (en) | 2019-02-02 | 2019-02-02 | Sandwich type top and bottom plate shear-resistant reinforced concrete slab beam structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109706854A CN109706854A (en) | 2019-05-03 |
| CN109706854B true CN109706854B (en) | 2024-02-02 |
Family
ID=66264328
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910108602.1A Active CN109706854B (en) | 2019-02-02 | 2019-02-02 | Sandwich type top and bottom plate shear-resistant reinforced concrete slab beam structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109706854B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002227134A (en) * | 2001-01-31 | 2002-08-14 | Ishikawajima Harima Heavy Ind Co Ltd | Reinforcing structure for concrete floor board steel girder bridge |
| CN101644032A (en) * | 2009-08-31 | 2010-02-10 | 中交通力建设股份有限公司 | Beam-removing rib-increasing strengthening construction technology of highway bridge |
| CN103061271A (en) * | 2012-12-25 | 2013-04-24 | 中铁大桥勘测设计院集团有限公司 | Single plate force-bearing reinforcing method of hollow slab bridge |
| KR101797969B1 (en) * | 2017-01-17 | 2017-11-15 | 브릿지테크놀러지(주) | Slab girder bridge with arch deck and the construction method therefor |
| CN208088093U (en) * | 2018-04-16 | 2018-11-13 | 中交公路规划设计院有限公司 | A kind of Hollow Slab Beam Bridge that transverse splicing is reinforced |
| CN209907232U (en) * | 2019-02-02 | 2020-01-07 | 中交公路长大桥建设国家工程研究中心有限公司 | Sandwich type top and bottom plate shear-strengthening concrete slab beam structure |
-
2019
- 2019-02-02 CN CN201910108602.1A patent/CN109706854B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002227134A (en) * | 2001-01-31 | 2002-08-14 | Ishikawajima Harima Heavy Ind Co Ltd | Reinforcing structure for concrete floor board steel girder bridge |
| CN101644032A (en) * | 2009-08-31 | 2010-02-10 | 中交通力建设股份有限公司 | Beam-removing rib-increasing strengthening construction technology of highway bridge |
| CN103061271A (en) * | 2012-12-25 | 2013-04-24 | 中铁大桥勘测设计院集团有限公司 | Single plate force-bearing reinforcing method of hollow slab bridge |
| KR101797969B1 (en) * | 2017-01-17 | 2017-11-15 | 브릿지테크놀러지(주) | Slab girder bridge with arch deck and the construction method therefor |
| CN208088093U (en) * | 2018-04-16 | 2018-11-13 | 中交公路规划设计院有限公司 | A kind of Hollow Slab Beam Bridge that transverse splicing is reinforced |
| CN209907232U (en) * | 2019-02-02 | 2020-01-07 | 中交公路长大桥建设国家工程研究中心有限公司 | Sandwich type top and bottom plate shear-strengthening concrete slab beam structure |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109706854A (en) | 2019-05-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202390752U (en) | Fiber-steel composite pipe reinforced concrete pier | |
| CN101967853B (en) | Fiber reinforce plastic (FRP)-rubber-steel composite pipe concrete structure | |
| CN106869015A (en) | A kind of FRP pipes cast-in-place with half half prefabricated regeneration concrete prestressing force overlapping bridge pier and preparation method | |
| CN202416292U (en) | Impact-resistance steel fiber and rubber modified recycled concrete pile | |
| CN101748828A (en) | Concrete filled steel tube laminated column frame inbuilt steel plate and steel truss interconnected space shear wall | |
| CN104612133A (en) | Concrete precast pile with mixed reinforcement of glass fiber-reinforced polymers and steel bars | |
| CN103306426B (en) | Repair type span centre bolt connects high ductility beam | |
| CN202596028U (en) | Carbon fiber pres-stressed reinforcing steel and high strength steel bar ultra-high toughness fiber reinforced cement-based composite beam structure | |
| CN108677690A (en) | Energy dissipating Self-resetting bilayer rectangle hollow concrete filled steel tube waves Bridge Pier Structure System | |
| CN102121289A (en) | Ultrahigh-strength and ultrathin bottom board for laminated slab and production method thereof | |
| CN112227200B (en) | Non-stud toughness combined bridge deck system | |
| CN201972287U (en) | Ultrathin bottom plate with superhigh strength for lamination board | |
| CN213014999U (en) | Hollow section steel concrete column | |
| CN203238979U (en) | FRP reinforcement circular arc concrete shock-resistant column | |
| CN112227199A (en) | Toughness combined bridge deck plate composed of cold-bending Z-shaped steel | |
| CN206625404U (en) | A kind of concrete filled steel tube organ timbering shear wall with type steel support | |
| CN201588315U (en) | Steel plate and steel truss coupled shear wall internally hidden in steel pipe concrete overlapped pillar frame | |
| CN112195778B (en) | Toughness combination bridge deck plate composed of T-shaped steel | |
| CN109706854B (en) | Sandwich type top and bottom plate shear-resistant reinforced concrete slab beam structure | |
| CN211850370U (en) | Sea sand fiber recycled concrete combined column with built-in FRP framework, hollow interlayer and stainless steel tube | |
| CN209907232U (en) | Sandwich type top and bottom plate shear-strengthening concrete slab beam structure | |
| CN103306491A (en) | FRP reinforcement arc concrete impact resistant column | |
| CN102808478A (en) | Bolted dismountable anti-cracking impermeable permanent beam form | |
| CN114562068B (en) | High crack resistance, strong compound ECC reinforcing concrete sandwich heat preservation wallboard | |
| CN210134331U (en) | UHPC box steel pipe concrete strength nature skeleton post structure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TG01 | Patent term adjustment | ||
| TG01 | Patent term adjustment |