CN112593658A - Steel-FRP (fiber reinforced plastic) composite bar seawater sea sand concrete beam, design method and preparation method - Google Patents

Steel-FRP (fiber reinforced plastic) composite bar seawater sea sand concrete beam, design method and preparation method Download PDF

Info

Publication number
CN112593658A
CN112593658A CN202011495846.9A CN202011495846A CN112593658A CN 112593658 A CN112593658 A CN 112593658A CN 202011495846 A CN202011495846 A CN 202011495846A CN 112593658 A CN112593658 A CN 112593658A
Authority
CN
China
Prior art keywords
steel
sea sand
concrete beam
frp composite
sand concrete
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.)
Pending
Application number
CN202011495846.9A
Other languages
Chinese (zh)
Inventor
郭永昌
蔡咏键
肖淑华
洪林波
陈晓彬
杨嘉霖
林嘉祥
曾俊杰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guangdong University of Technology
Original Assignee
Guangdong University of Technology
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Guangdong University of Technology filed Critical Guangdong University of Technology
Priority to CN202011495846.9A priority Critical patent/CN112593658A/en
Publication of CN112593658A publication Critical patent/CN112593658A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/20—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of concrete or other stone-like material, e.g. with reinforcements or tensioning members
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B1/00—Producing shaped prefabricated articles from the material
    • B28B1/04—Producing shaped prefabricated articles from the material by tamping or ramming
    • B28B1/045—Producing shaped prefabricated articles from the material by tamping or ramming combined with vibrating or jolting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
    • B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/10—Geometric CAD
    • G06F30/13—Architectural design, e.g. computer-aided architectural design [CAAD] related to design of buildings, bridges, landscapes, production plants or roads

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Manufacturing & Machinery (AREA)
  • Theoretical Computer Science (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Ceramic Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Civil Engineering (AREA)
  • Computer Hardware Design (AREA)
  • General Engineering & Computer Science (AREA)
  • Evolutionary Computation (AREA)
  • Pure & Applied Mathematics (AREA)
  • Mathematical Optimization (AREA)
  • Mathematical Analysis (AREA)
  • Computational Mathematics (AREA)
  • Rod-Shaped Construction Members (AREA)

Abstract

The invention provides a steel-FRP (fiber reinforced plastic) composite rib seawater sea sand concrete beam which comprises pressed longitudinal ribs positioned on two sides, wherein a plurality of stirrups are arranged between the pressed longitudinal ribs, sea sand concrete is filled around the longitudinal ribs and the stirrups, the pressed longitudinal ribs and the stirrups are both steel-FRP composite ribs, the steel-FRP composite ribs are threaded ribs formed by winding fiber bundles on the surfaces of the steel bars, and the steel-FRP composite ribs are inner cores and outer layers. The invention also provides a design method of the steel-FRP composite rib seawater sea sand concrete beam. The invention also provides a preparation method of the steel-FRP composite rib seawater sea sand concrete beam. The FPR in the invention adopts the fiber bundle, the fiber bundle can be automatically wound outside the steel bar by using equipment, industrial mass production can be realized, and the performance of the produced product is more stable.

Description

Steel-FRP (fiber reinforced plastic) composite bar seawater sea sand concrete beam, design method and preparation method
Technical Field
The invention relates to the technical field of steel-FRP composite concrete beams, in particular to a steel-FRP composite rib seawater sea sand concrete beam, a design method and a preparation method.
Background
Under the strategic background of the powerful ocean in China, a large amount of infrastructure construction is needed at sea and around. The reinforced concrete structure is used as a building structure which is most widely applied, and the internal steel bars of the reinforced concrete structure are extremely easy to corrode in the ocean high-salt environment, so that the service life of the structure is shortened, and the structure safety is even endangered; the existing solution is to replace ordinary steel bars with FRP bars, but the characteristics of the FRP bars are different from those of the ordinary steel bars, when the FRP bars are independently used in concrete beam structures, the problems of brittle failure of the FRP bar concrete members and overlarge crack width and deflection generated in the using state are easily caused, the bearing and the use performance of the FRP bar concrete members are greatly influenced, and the popularization and the application of the FRP bar concrete members in the field of civil engineering are greatly limited.
The application discloses a hybrid FRP-steel composite bar sea sand concrete beam, which comprises sea sand concrete, an upper composite bar, a lower composite bar and a plurality of stirrups, wherein the upper composite bar, the lower composite bar and the stirrups are fixedly arranged in the sea sand concrete, and the stirrups are uniformly and fixedly bound on the outer surfaces of the upper composite bar and the lower composite bar along the length direction of the upper composite bar and the lower composite bar; the upper composite ribs and the lower composite ribs are arranged in plurality and are respectively arranged at the upper end and the lower end of the sea sand concrete; the upper composite ribs and the lower composite ribs comprise reinforcing steel bars and FRP fiber cloth coated on the outer surfaces of the reinforcing steel bars, the FRP fiber cloth of each upper composite rib is made of the same material or different materials, the FRP fiber cloth of the plurality of lower composite ribs is made of at least two materials, and the FRP fiber cloth is bonded with the sea sand concrete; the FRP fiber cloth of the lower composite rib comprises at least two of carbon fiber cloth, glass fiber cloth, basalt fiber cloth and aramid fiber cloth, the fiber cloth is adopted in the patent, the fiber cloth needs to be manually covered on the outer surface of the reinforcing steel bar, the production cost is high, the quality of the composite rib obtained by production is good and uneven, the performance of the prepared beam is unstable, and the design and preparation method of the FRP-steel composite rib sea sand concrete beam are not mentioned.
Disclosure of Invention
The invention aims to overcome the defects that the existing FRP composite bars are good in quality and not uniform and the performance of the prepared beam is not stable, and provides a steel-FRP composite bar seawater sea sand concrete beam. The FPR in the invention adopts the fiber bundle, the fiber bundle can be automatically wound outside the steel bar by using equipment, industrial mass production can be realized, and the performance of the produced product is more stable.
The invention also provides a design method of the steel-FRP composite rib seawater sea sand concrete beam.
The invention also provides a preparation method of the steel-FRP composite rib seawater sea sand concrete beam.
In order to solve the technical problems, the invention adopts the technical scheme that: the steel-FRP composite rib seawater sea sand concrete beam comprises compression longitudinal ribs positioned on two sides of the concrete beam, wherein a plurality of stirrups are arranged between the compression longitudinal ribs, sea sand concrete is filled around the compression longitudinal ribs and the stirrups, the compression longitudinal ribs and the stirrups are both steel-FRP composite ribs, the steel-FRP composite ribs are formed by winding reinforcing steel bars as inner cores and FRP as outer layers on the surfaces of the reinforcing steel bars as fiber bundles.
In the technical scheme, the FRP of the fiber bundle can be wound on the outer surface of the steel bar through automatic equipment to form the threaded rib, the steel-FRP composite rib with the threaded rib has the advantages of high elastic modulus of the steel bar, good ductility, light weight, high strength and excellent corrosion resistance of the FRP, and the automatic production replaces manual preparation, so that the mass production can be realized, the production cost is reduced, and the product performance is more stable.
Furthermore, the reinforcing steel bars are plain round reinforcing steel bars or ribbed reinforcing steel bars.
Further, the fiber bundle is one or more of glass fiber reinforced polymer, carbon fiber reinforced polymer, basalt fiber reinforced polymer and nylon fiber reinforced polymer.
Further, the seawater and sea sand concrete comprises cement, fine aggregate, coarse aggregate and seawater. The fine aggregate is medium sand in the original sea sand, the coarse aggregate is granite macadam with the particle size of 5-20 mm, and the seawater is natural seawater.
A design method of a steel-FRP composite rib seawater sea sand concrete beam comprises the following steps:
s1, determining the section height h and the section width b of the steel-FRP composite rib seawater sea sand concrete beam according to the empirical values of the span-height ratio and the height-width ratio, and selecting the type of the steel-FRP composite rib according to the required elastic modulus;
s2, calculating the required reinforcement area Asf through the bending resistance bearing capacity design value Mu, and selecting the number n of reinforcement;
s3, calculating yield deflection and limit deflection according to the section size and the number n of the reinforcement bars of the designed steel-FRP composite bar seawater sea sand concrete beam;
and S4, checking and calculating the width of the crack.
Further, the step S2 includes the following specific steps:
s21, calculating the height of the concrete relative compression zone in the ultimate bearing capacity state, wherein the calculation formula is as follows:
Figure BDA0002842122130000021
s22, calculating the stress of the steel-FRP composite rib; the calculation formula is as follows:
Figure BDA0002842122130000031
s23, calculating the reinforcement area Asf required by the steel-FRP composite reinforcement, and selecting the reinforcement number n, wherein the calculation formula of Asf is as follows:
Figure BDA0002842122130000032
in the above formula, a is the distance from the load to the support; epsilonvTaking the strain of the steel-FRP composite bar during yieldv＝0.002；EⅠ、EⅡRespectively is the initial elastic modulus and the post-yield elastic modulus of the steel-FRP composite bar; fsfy is the yield strength of the steel-FRP composite rib; ho is the cross-sectional effective height.
Further, the step S3 includes the following specific steps:
s24, calculating yield bending moment of the steel-FRP composite rib seawater sea sand concrete beam;
and S25, calculating the limit deflection according to the effective moment of inertia.
Further, in the step S24, the height of the concrete in the compression zone needs to be calculated first, and the yield bending moment is calculated according to the height of the compression zone, where the calculation formula is as follows:
concrete height of compression zone at yield:
Figure BDA0002842122130000033
yield bending moment:
Figure BDA0002842122130000034
in the above formula, Ec, Es, EfThe elastic moduli of the concrete, the steel bar inner core and the FRP are respectively; a. thefAnd ASThe cross sectional areas of the FRP and the steel bar inner core are respectively.
Effective moment of inertia in cross section:
Figure BDA0002842122130000035
according to the theory of material mechanics, a formula for calculating the yield deflection of the steel-FRP composite rib seawater sea sand concrete beam is as follows:
Figure BDA0002842122130000036
in the above formulas (6) and (7), α is a deflection coefficient relating to a load and a support condition, and α is 23/216 for a four-point bending simply supported beam; beta is ad＝0.5(1+Ef/Es) The coefficient of cohesion; ec is the modulus of elasticity of concrete; loThe beam span is steel-FRP composite bar seawater sea sand concrete beam span;
Figure BDA0002842122130000044
respectively representing the effective inertia moment of the cross section of the steel-FRP composite bar before and after yielding; icr represents the section cracking moment of inertia; ig represents the moment of inertia when the section is not cracked; mcr, My and Ma respectively represent bending moments when the concrete in the tension area cracks, the steel-FRP composite bar yields and is used.
The crack width calculation formula of step S4 is as follows:
Figure BDA0002842122130000041
Figure BDA0002842122130000042
Figure BDA0002842122130000043
in the formula, beta is the ratio of the distance from the surface of the tension area to a neutral axis to the distance from the FRP rib center to the neutral axis; k is a radical ofdTaking k as a bonding degree coefficient for the steel-FRP composite rib seawater sea sand concrete beamd1.4; dc is longitudinal rib centroidDistance to the bottom of the beam; s is the longitudinal rib spacing; efAnd Es are the elastic modulus of the FRP and the reinforcing steel bar respectively.
A preparation method of a steel-FRP composite bar seawater sea sand concrete beam comprises the following steps:
binding a steel-FRP composite reinforcement cage according to a construction drawing of a steel-FRP composite reinforcement seawater sea sand concrete beam structure;
step two, building a template, putting the bound steel-FRP composite reinforcement cage into the template, filling the whole template with concrete, vibrating and molding by using a vibrating rod, and trowelling the surface;
and step three, covering a waterproof film on the steel-FRP composite rib seawater sea sand concrete beam, removing the mold after the steel-FRP composite rib seawater sea sand concrete beam finishes final setting, then watering and maintaining, and meanwhile covering the waterproof film for moisturizing.
Further, the concrete in the second step is seawater sea sand concrete, and the preparation process of the seawater sea sand concrete comprises the following steps of weighing cement, sea sand and broken stone according to the mixing ratio; pouring dry materials such as cement, sea sand and gravel into a stirrer, and stirring uniformly for 180 s; after the stirring of the dry materials is finished, adding seawater, and stirring for 300 s.
Compared with the prior art, the invention has the beneficial effects that:
the structure of the steel-FRP composite rib is improved, so that the production efficiency and quality can be improved through industrial processing, and the cost of manual manufacturing is reduced; the invention provides a design method of a steel-FRP composite bar seawater sea sand concrete beam, which can quickly and effectively obtain the size of the concrete beam meeting the performance requirement, calculate the yield deflection and the ultimate deflection of the concrete beam and match with the building requirement; the invention also provides a manufacturing method of the steel-FRP composite bar seawater sea sand concrete beam, the concrete beam with better performance can be obtained according to the manufacturing method, the concrete used in the invention is the concrete made of sea sand and seawater, the problems of river sand resource exhaustion and high transportation cost of building materials in ocean engineering are effectively solved by using the seawater sea sand concrete, and the economic cost is greatly reduced.
Drawings
FIG. 1 is a schematic diagram of the internal structure of a steel-FRP composite rib seawater sea sand concrete beam.
FIG. 2 is a schematic structural diagram of a cross section of the steel-FRP composite rib seawater sea sand concrete beam.
The graphic symbols are illustrated as follows:
1-top pressed longitudinal bar, 2-bottom pressed longitudinal bar, 3-stirrup, 4-seawater sea sand concrete
Detailed Description
The present invention will be further described with reference to the following embodiments. Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms may be understood by those skilled in the art according to specific circumstances.
Example 1
As shown in fig. 1 to 2, in an embodiment of the steel-FRP composite rib sea water sand concrete beam of the present invention, two sides of the inside of the sea water sand concrete beam are provided with compressed longitudinal ribs, the upper part of the sea water sand concrete beam in fig. 1 is a top compressed longitudinal beam 1, the lower part is a bottom compressed longitudinal beam 2, a plurality of stirrups 3 are arranged between the top compressed longitudinal rib 1 and the bottom compressed longitudinal rib 2, and the peripheries of the top compressed longitudinal rib 1, the bottom compressed longitudinal rib 2 and the stirrups 3 are filled with sea water sand concrete 4, the compressed longitudinal ribs and the stirrups 3 are all steel-FRP composite ribs, the steel-FRP composite ribs take steel bars as inner cores, the FRP is an outer layer, and in this embodiment, the FRP is wound on the surfaces of the steel bars in a fiber bundle form to form threaded.
In this embodiment, the reinforcing steel bars are ribbed reinforcing steel bars, the fiber bundles are made of glass fiber reinforced polymer, and it should be noted that the fiber bundles may also be made of one or more of carbon fiber reinforced polymer, basalt fiber reinforced polymer, and nylon fiber reinforced polymer.
In the embodiment, the seawater sea sand concrete 4 comprises cement, fine aggregate, coarse aggregate and seawater, wherein the fine aggregate is medium sand in original sea sand, the coarse aggregate is granite macadam with the particle size of 5-20 mm, and the seawater is natural seawater.
In this embodiment, the FRP of the fiber bundle can be wound on the outer surface of the steel bar by the automatic device to form the threaded rib, the steel-FRP composite bar with the threaded rib has the advantages of high elastic modulus of the steel bar, good ductility, light weight, high strength and excellent corrosion resistance of the FRP, and the automatic production replaces manual preparation, so that the mass production can be realized, the production cost is reduced, and the product performance is more stable.
Example 2
An embodiment of a design method of a steel-FRP composite bar seawater sea sand concrete beam. A design method of a steel-FRP composite rib seawater sea sand concrete beam comprises the following steps:
s1, determining the section size b multiplied by h of the steel-FRP composite bar seawater sea sand concrete beam to be 200mm multiplied by 400mm according to the empirical values of the span-height ratio and the height-width ratio, wherein the concrete strength grade is c30, fc＝25.6MPa，Ec25.32 GPa; selecting HRB 400-grade steel bars with the diameter of 10mm as inner cores of the steel-FRP composite bars, and selecting GFRP with the thickness of 3mm as outer layers, wherein the mechanical parameters of the steel-FRP composite bars are as follows: a. thes＝78.5mm2，Af＝122.5mm2，fy＝470MPa，Ef＝50.7GPa，Es＝193GPa，Ef＝50.7GPa，Es＝193GPa，EⅠ＝106.29GPa，EⅡ30.90GPa, fsfy 258.8 MPa; design bending momentThe value was 95 kN.m.
S2, calculating the required reinforcement area Asf through the bending resistance bearing capacity design value Mu, and selecting the reinforcement number n, wherein the specific process is as follows;
height of concrete relative compression area in ultimate bearing capacity state:
Figure BDA0002842122130000061
stress of the steel-FRP composite rib:
Figure BDA0002842122130000062
the reinforcement area required by the steel-FRP composite reinforcement is as follows:
Figure BDA0002842122130000071
the required quantity of the steel-FRP composite ribs is as follows:
Figure BDA0002842122130000072
taking n as 3, Asf＝602.9mm2
S3, calculating yield deflection and ultimate deflection according to the section size and the number n of the reinforcement bars of the designed steel-FRP composite bar seawater sea sand concrete beam, and the concrete process is as follows,
bending resistance bearing capacity of the steel-FRP composite rib seawater sea sand concrete beam during yield:
the concrete height of the compression area is as follows:
Figure BDA0002842122130000073
according to the section bending moment balance, the yield bending moment:
Figure BDA0002842122130000074
and (3) taking the yield state of the steel-FRP composite bar seawater sea sand concrete beam as the normal use limit state, calculating the deflection:
Figure BDA0002842122130000075
Figure BDA0002842122130000076
the normal use state of the steel-FRP composite rib seawater sea sand concrete beam is before the yield of the steel-FRP composite rib, and the yield deflection of the steel-FRP composite rib seawater sea sand concrete beam is less than the deflection limit value of 9mm according to the calculation result.
Deflection of the steel-FRP composite rib seawater sea sand concrete beam in the limit state of bearing capacity:
Figure BDA0002842122130000077
Figure BDA0002842122130000081
s4, checking and calculating the width of the crack, wherein the specific process is as follows;
Figure BDA0002842122130000082
Figure BDA0002842122130000083
Figure BDA0002842122130000084
Figure BDA0002842122130000085
Figure BDA0002842122130000086
according to the calculation result, the crack width of the steel-FRP composite bar seawater sea sand concrete beam when yielding is smaller than the crack limit value of the steel-FRP composite bar seawater sea sand concrete beam when in a normal use limit state by 0.5 mm.
Example 3
An embodiment of a preparation method of a steel-FRP composite bar seawater sea sand concrete beam. A preparation method of a steel-FRP composite bar seawater sea sand concrete beam is disclosed, wherein the known steel-FRP composite bar seawater sea sand concrete beam has the section size of b multiplied by h being 200mm multiplied by 400mm, the beam length l being 2200mm, and the span lo being 1800mm, and the preparation method comprises the following specific steps:
step one, selecting seawater sea sand concrete 4 with the strength grade of c30, and calculating the mixing ratio according to the technical specification for sea sand concrete application: cement, sea sand, broken stone and seawater 1.00:2.26:3.70: 0.65; the sand rate is 38 percent, and the water-cement ratio is 0.65; the cement is P.O.42.5, the sea sand is medium sand, and the broken stone is granite with the particle size of 5-20 mm.
And step two, binding the steel-FRP composite reinforcement cage according to the construction drawing of the steel-FRP composite reinforcement seawater sea sand concrete beam structure, and meeting the binding requirement.
Step three, erecting a template in a pouring site, fixing and cleaning the template, placing the bound steel-FRP composite reinforcement cage into the template, filling the prepared seawater sea sand concrete into the mold, vibrating the dense seawater sea sand concrete by using a vibrating rod, trowelling the surface of the steel-FRP composite reinforcement seawater sea sand concrete beam, paving a waterproof film on the poured steel-FRP composite reinforcement seawater sea sand concrete beam to prevent the water from evaporating too fast, removing the mold after the seawater sea sand concrete 4 is finally set, watering and maintaining regularly, and paving the waterproof film for moisturizing.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. The utility model provides a steel-FRP composite bar sea water sea sand concrete beam which characterized in that: the reinforced concrete beam comprises compression longitudinal bars positioned on two sides of a concrete beam, wherein a plurality of stirrups are arranged between the compression longitudinal bars, sea sand concrete is filled around the compression longitudinal bars and the stirrups, steel-FRP composite bars which are adopted by the compression longitudinal bars and the stirrups are used as inner cores of the steel-FRP composite bars, FRP is used as an outer layer, and fiber bundles are wound on the surfaces of the steel bars to form thread ribs.
2. The steel-FRP composite rib seawater sea sand concrete beam as claimed in claim 1, which is characterized in that: the reinforcing steel bars are plain round reinforcing steel bars or ribbed reinforcing steel bars.
3. The steel-FRP composite rib seawater sea sand concrete beam as claimed in claim 1, which is characterized in that: the fiber bundle is one or more of glass fiber reinforced polymer, carbon fiber reinforced polymer, basalt fiber reinforced polymer and nylon fiber reinforced polymer.
4. The steel-FRP composite rib seawater sea sand concrete beam as claimed in claim 1, which is characterized in that: the seawater and sea sand concrete comprises cement, fine aggregate, coarse aggregate and seawater.
5. A design method of a steel-FRP composite rib seawater sea sand concrete beam comprises the following steps: the method is characterized in that: the method comprises the following steps:
s1, determining the section height h and the section width b of the steel-FRP composite rib seawater sea sand concrete beam according to the empirical values of the span-height ratio and the height-width ratio, and selecting the type of the steel-FRP composite rib according to the required elastic modulus;
s2, calculating the required reinforcement area Asf through the bending resistance bearing capacity design value Mu, and selecting the number n of reinforcement;
s3, calculating yield deflection and limit deflection according to the section size and the number n of the reinforcement bars of the designed steel-FRP composite bar seawater sea sand concrete beam;
and S4, checking and calculating the width of the crack.
6. The design method of the steel-FRP composite rib seawater sea sand concrete beam as claimed in claim 5, wherein the concrete beam comprises the following steps: the method is characterized in that: the step S2 includes the following specific steps:
s21, calculating the height of the concrete relative compression zone in the ultimate bearing capacity state;
s22, calculating the stress of the steel-FRP composite rib;
s23, calculating the reinforcement area Asf required by the steel-FRP composite reinforcement, and selecting the number n of the reinforcement.
7. The design method of the steel-FRP composite rib seawater sea sand concrete beam as claimed in claim 6, wherein the concrete beam comprises the following steps: the method is characterized in that: the step S3 includes the following specific steps:
s24, calculating yield bending moment of the steel-FRP composite rib seawater sea sand concrete beam;
and S25, calculating the limit deflection according to the effective moment of inertia.
8. The design method of the steel-FRP composite rib seawater sea sand concrete beam as claimed in claim 6, wherein the concrete beam comprises the following steps: the method is characterized in that: in the step S24, the height of the concrete in the compression area needs to be calculated first, and the yield bending moment is calculated according to the height of the compression area.
9. A preparation method of a steel-FRP composite bar seawater sea sand concrete beam is characterized by comprising the following steps: the method comprises the following steps:
binding a steel-FRP composite reinforcement cage according to a construction drawing of a steel-FRP composite reinforcement seawater sea sand concrete beam structure;
step two, building a template, putting the bound steel-FRP composite reinforcement cage into the template, filling the whole template with concrete, vibrating and molding by using a vibrating rod, and trowelling the surface;
and step three, covering a waterproof film on the steel-FRP composite rib seawater sea sand concrete beam, removing the mold after the steel-FRP composite rib seawater sea sand concrete beam finishes final setting, then watering and maintaining, and meanwhile covering the waterproof film for moisturizing.
10. The method for preparing the steel-FRP composite rib seawater sea sand concrete beam as claimed in claim 9, wherein the concrete in the second step is seawater sea sand concrete, and the seawater sea sand concrete is prepared by weighing cement, sea sand and broken stone according to the mixing ratio; pouring dry materials such as cement, sea sand and gravel into a stirrer, and stirring uniformly for 180 s; after the stirring of the dry materials is finished, adding seawater, and stirring for 300 s.
CN202011495846.9A 2020-12-17 2020-12-17 Steel-FRP (fiber reinforced plastic) composite bar seawater sea sand concrete beam, design method and preparation method Pending CN112593658A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011495846.9A CN112593658A (en) 2020-12-17 2020-12-17 Steel-FRP (fiber reinforced plastic) composite bar seawater sea sand concrete beam, design method and preparation method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011495846.9A CN112593658A (en) 2020-12-17 2020-12-17 Steel-FRP (fiber reinforced plastic) composite bar seawater sea sand concrete beam, design method and preparation method

Publications (1)

Publication Number Publication Date
CN112593658A true CN112593658A (en) 2021-04-02

Family

ID=75196995

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011495846.9A Pending CN112593658A (en) 2020-12-17 2020-12-17 Steel-FRP (fiber reinforced plastic) composite bar seawater sea sand concrete beam, design method and preparation method

Country Status (1)

Country Link
CN (1) CN112593658A (en)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104060767A (en) * 2014-06-19 2014-09-24 四川航天五源复合材料有限公司 Method of industrially preparing steel-continuous-fiber composite bar
CN104295005A (en) * 2014-09-22 2015-01-21 武汉理工大学 Sheet steel glass fiber composite rib in radial distribution and manufacturing method thereof
AU2015100567A4 (en) * 2015-04-29 2015-05-28 Hornsey, Nicholas MR A modular FRP retaining wall
CN105040904A (en) * 2015-07-13 2015-11-11 涂建维 Method for designing fiber reinforce plastic (FRP) reinforced concrete beam for controlling crack width and deflection
CN107217786A (en) * 2017-05-05 2017-09-29 广东工业大学 Confusion type FRP steel composite reinforcing marine sand concrete beams
CN110318495A (en) * 2019-07-10 2019-10-11 中国矿业大学 One kind can assembled permanent formwork overlapping FRP tendons seawater sea sand Recycled Concrete Beams and preparation method thereof
CN110821047A (en) * 2019-12-13 2020-02-21 南通装配式建筑与智能结构研究院 Composite steel bar FRP stirrup and preparation method thereof

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104060767A (en) * 2014-06-19 2014-09-24 四川航天五源复合材料有限公司 Method of industrially preparing steel-continuous-fiber composite bar
CN104295005A (en) * 2014-09-22 2015-01-21 武汉理工大学 Sheet steel glass fiber composite rib in radial distribution and manufacturing method thereof
AU2015100567A4 (en) * 2015-04-29 2015-05-28 Hornsey, Nicholas MR A modular FRP retaining wall
CN105040904A (en) * 2015-07-13 2015-11-11 涂建维 Method for designing fiber reinforce plastic (FRP) reinforced concrete beam for controlling crack width and deflection
CN107217786A (en) * 2017-05-05 2017-09-29 广东工业大学 Confusion type FRP steel composite reinforcing marine sand concrete beams
CN110318495A (en) * 2019-07-10 2019-10-11 中国矿业大学 One kind can assembled permanent formwork overlapping FRP tendons seawater sea sand Recycled Concrete Beams and preparation method thereof
CN110821047A (en) * 2019-12-13 2020-02-21 南通装配式建筑与智能结构研究院 Composite steel bar FRP stirrup and preparation method thereof

Similar Documents

Publication Publication Date Title
Oskouei et al. Experimental study of the punching behavior of GFRP reinforced lightweight concrete footing
NO20130401A1 (en) Reinforcing rod and method for making such reinforcing rods
Anandan et al. Comparative study on the behavior of modified ferrocement wrapped columns and cfrp wrapped columns
Anandan et al. Comparative study on the behavior of conventional ferrocement and modified ferrocement wrapped columns
CN102121289B (en) Ultrahigh-strength and ultrathin bottom board for laminated slab and production method thereof
Al-Sarraf et al. Effect of steel fiber on the behavior of deep beams with and without web opening
CN110847496A (en) FRP rib part steel fiber reinforced concrete beam and preparation method thereof
CN201972287U (en) Ultrathin bottom plate with superhigh strength for lamination board
CN1017638B (en) Prestressed construction element of composite structure and method for element fabrication
Moosa et al. Experimental investigation on the transform the simply supported girders to continuous girder by using the UHPC cast in place joint
CN108824695B (en) FRP rib concrete beam with ductility and preparation method thereof
CN112593658A (en) Steel-FRP (fiber reinforced plastic) composite bar seawater sea sand concrete beam, design method and preparation method
JP2010196345A (en) Bamboo-reinforced concrete secondary molded product, and method for molding the concrete secondary molded product
CN114033101B (en) Full FRP rib reinforced seawater sea sand concrete high-ductility beam and application thereof
US20060051546A1 (en) Hybrid structural module
Schaumann Hybrid FRP-lightweight concrete sandwich system for engineering structures
Rao et al. Shear strength of RC deep beams
Punnoose et al. Experimental study of strengthening of RC deep beam with web opening
JP2004137723A (en) Structure of bridge girder and construction method of bridge girder
Tudu Study of torsional behaviour of rectangular reinforced concrete beams wrapped with GFRP
Mhadeshwar et al. Experimental performance, mathematical modelling and development of stress block parameter of ferrocement beams with rectangular trough shaped skeletal steel
CN108484034B (en) Fiber reinforced cement-based composite material concrete reinforced restraint pipe and preparation method thereof
Kedge et al. Experimental analysis of deep beam strengthened by glass fiber reinforced polymer plate
CN216422923U (en) Tensioning device for prestressed fiber mesh reinforced concrete
Islam et al. Pre-cracked RC beam strengthening with CFRP materials

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