CN208235796U - A kind of FRP tendons-reinforcing bar composite strengthening ECC- Combined concrete T-type beam - Google Patents
A kind of FRP tendons-reinforcing bar composite strengthening ECC- Combined concrete T-type beam Download PDFInfo
- Publication number
- CN208235796U CN208235796U CN201820231906.8U CN201820231906U CN208235796U CN 208235796 U CN208235796 U CN 208235796U CN 201820231906 U CN201820231906 U CN 201820231906U CN 208235796 U CN208235796 U CN 208235796U
- Authority
- CN
- China
- Prior art keywords
- ecc
- reinforcing bar
- frp tendons
- concrete
- type beam
- 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.)
- Expired - Fee Related
Links
Classifications
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
Landscapes
- Rod-Shaped Construction Members (AREA)
Abstract
A kind of FRP tendons-reinforcing bar composite strengthening ECC- Combined concrete T-type beam, including normal concrete, ECC, FRP tendons and reinforcing bar, stirrup.Described ECC layers is located at T-type beam tensile region, and described ECC layers does not need to vibrate when pouring；The advantages that FRP is placed in beam bottom edge, its high-strength corrosion-resistant is made full use of to lose；Muscle is indulged along the longitudinally disposed stress of component in ECC layers；Stirrup is provided with ECC layers of lower part.The utility model enhances ECC- Combined concrete T-type beam by all replacing tensile region normal concrete to form FRP tendons-reinforcing bar with ECC material；In order to increase ECC- concrete interface bonding, propose that the method for transverse concave groove is arranged at ECC layers to enhance interfacial adhesion effect.The utility model can greatly improve such T-type beam durability, not only economical but also easy for construction for engineering.
Description
Technical field
The utility model relates to FRP tendons-reinforcing bar composite strengthening ECC- coagulation local soil type mould assembly beams, belong to building structure technology neck
Domain.
Background technique
In traditional reinforced concrete structure, engineering accident caused by crack problem is frequent occurrence；Concrete tensile strength
It is low, be easy to produce crack, and once crack, fracture width just increases rapidly, accelerates harmful substance intrusion inside concrete
Speed, eventually lead to the corrosion of reinforcing bar, promoted the deterioration of structure, reduce the durability of structure.It is wide by control critical eigenvalue
The growth of degree can effectively obstruct internal reinforcing bar and react with corrosive deposit, to reduce the speed of steel bar corrosion, increase knot
The durability of structure.
A kind of fiber reinforced cement-based composite material that ECC is is stretching and high ductile characteristic is presented under shear load.
ECC has begun and is building as a kind of New Building Materials for having elongation strain hardening capacity and multiple cracking development characteristic
It is used in industry, since ECC price is compared with concrete height, reinforced beam integrally seems uneconomical using ECC.ECC is substituted
Concrete in tension zone can effectively improve the Crack Control ability of component.
Fibre reinforced composites (Fiber Reinforced Polymer/Plastic, abbreviation FRP) are by undulation degree
Expect the high performance material for mixing with basis material and being formed according to a certain percentage through certain process combining.FRP muscle has intensity
High, the advantages that density is low and corrosion-resistant, FRP tendons concrete component have that anti-bending bearing capacity is high, durability is good and post-seismic deformation
The advantages that recovery capability is strong.However, the disadvantages of FRP tendons elasticity modulus is low, deformation is big constrains its fortune in concrete structure
With.
Summary of the invention
The purpose of this utility model is, poor for Concrete Crack Control ability in reinforced concrete member, and tensile region holds
It is also easy to produce crack, once cracking, fracture width just increase rapidly, accelerates the speed of harmful substance intrusion inside concrete, most
Lead to the corrosion of reinforcing bar eventually, the design proposes that high-strength FRP tendons and reinforcing bar are used in combination and replaces tensile region reinforcing bar that can not only fill
The advantages that FRP tendons tensile strength height and corrosion resistance and good are waved in distribution, and can obtain higher compared with reinforced concrete member
Post-yield stiffness and smaller residual deformation significantly improve recoverability after the seismic bearing capacity and shake of component, component surrender
The promotion of rigidity will also be so that areas of plasticity hinge becomes larger, thus the deformability for reducing sectional curvature demand, improving component afterwards.This
Design proposes ECC substituting concrete in tension zone, is that FRP tendons provide stable constraint and effectively using its Crack Control ability
Protection, to guarantee the flexural capacity of FRP tendons.
The technical solution of the utility model is as follows: FRP tendons-reinforcing bar composite strengthening ECC- Combined concrete T-type beam, including
ECC layers, normal concrete layer, stirrup, FRP tendons and reinforcing bar.Described ECC layers is located at the lower layer of natural axis, and described ECC layers when pouring
It does not need to vibrate；Its upper surface is longitudinally evenly arranged transverse concave groove along component；The normal concrete layer is cast on ECC layer；
Muscle is indulged along the longitudinally disposed stress of component in ECC layers；Stirrup is provided with ECC layers of lower part；Natural axis is inside web.
The ECC is a kind of high-tenacity fiber enhancing cement-base composite material, by water, cement, quartz sand, efficient diminishing
Agent, level-one flyash and PVA fiber composition.Wherein the content of level-one flyash accounts for the 80% of composite material gross mass；PVA fiber
Account for the 2% of volume volume.
Described ECC layers is located at natural axis in the following, being tensile region, is all poured with ECC.
The normal concrete layer is formed by common concreting.
The utility model be by making full use of its micro-cracks ability with ECC material, while it is FRP tendons-reinforcing bar is multiple
It closes using reduction because of the influence that FRP elasticity modulus is low, the poor amount of deflection for leading to component of ductility is big, forms a kind of new FRP tendons-reinforcing bar
Composite strengthening ECC- Combined concrete T-type beam.
Detailed description of the invention
Fig. 1 is that the utility model combines FRP tendons-reinforcing bar composite strengthening ECC- Combined concrete T-type beam structural schematic diagram；
Fig. 2 is ECC and concrete in tension stress-strain diagram and fracture width comparison diagram；
Fig. 3 is the compound tensile strength comparison diagram of FRP tendons, reinforcing bar, FRP tendons reinforcing bar；
Fig. 4 is T-type section force analysis figure；
Fig. 5 is ECC concrete interface processing mode figure.
Specific embodiment
The technical solution of the utility model is described further with reference to the accompanying drawings of the specification:
In order to make full use of the Crack Control ability of ECC, first calculating T-type, which cuts section bar, neutralizes shaft position:
It is divided into two kinds according to shaft position difference is neutralized, in the edge of a wing or in Liang Leichu.In order to identify which T-type section belongs to
Seed type analyzes x=h as shown in Figure 4f' special circumstances can be obtained by the equilibrium condition and moment equilibrium condition of power:
α1fcbf′hf'=fyAs+σfAf
In formula: h0=h-as, asFor muscle material protective layer thickness, s is FRP tendons and bar spacing, fyFor reinforcement yielding intensity, As
For area of reinforcement, σfFor the intensity of FRP tendons, according to plane cross-section assumption compression damage are as follows:
(wherein, EfFor FRP tendons elasticity modulus, x is to neutralize shaft position), εcFor the strain of compressive region concrete destruction.AfFor FRP tendons section
Area, bfFor the flange width of T-type Section Flexural Members compressive region, hf' be T-type Section Flexural Members compressive region edge of a wing height,
fcFor concrete crushing strength, α1For related coefficient.
(1) work as α1fcbf′hf′-σfAf≤fyAsShi Zhonghe shaft position is in the edge of a wing, i.e. x≤hf′。
(2) work as α1fcbf′hf′-σfAf> fyAsShi Zhonghe shaft position is in the edge of a wing, x > hf′
Wherein ECC layers of casting area are that neutralization shaft position, that is, x calculating is as follows
(1) when belonging to the first natural axis in the edge of a wing
α1fcbf′x-σfAf'=fyAs
(2) when belonging to second of natural axis in the edge of a wing
α1fc(bf′-b)+α1fcbx-σfAf=fyAs
The specific implementation step of the utility model are as follows:
The production of the present embodiment component is poured including member bottom section ECC layers, the interface of ECC layers and normal concrete layer
Reason, normal concrete layer pour and the binding of component inside reinforcing bar.
Before this component pours, first the reinforcing bar of component and FRP tendons are bound；FRP tendons are placed in beam bottom, reinforcing bar is placed in
Steel reinforcement cage is made in inside and stirrup binding together；Steel reinforcement cage puts element mold into.This test group zygostyle pours step are as follows:
After the completion of template, assembling steel reinforcement cage；Until a cutting process is ready, ECC is first poured, it is (about 1 small after ECC initial set
When), spill processing, then casting concrete are carried out, test specimen is conserved after the completion.
Claims (2)
1. a kind of FRP tendons-reinforcing bar composite strengthening ECC- Combined concrete T-type beam, it is characterised in that: it is described combination include ECC layers,
Normal concrete layer, stirrup, reinforcing bar and FRP tendons；Described ECC layers is located at beam tensile region, and described ECC layers does not need to shake when pouring
It smashes；The normal concrete layer is cast on ECC layer.
2. a kind of FRP tendons according to claim 1-reinforcing bar composite strengthening ECC- Combined concrete T-type beam, feature exist
In: FRP tendons and reinforcing bar are used in combination, the FRP tendons are placed in the edge of corrosion-vulnerable in component.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820231906.8U CN208235796U (en) | 2018-01-27 | 2018-01-27 | A kind of FRP tendons-reinforcing bar composite strengthening ECC- Combined concrete T-type beam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820231906.8U CN208235796U (en) | 2018-01-27 | 2018-01-27 | A kind of FRP tendons-reinforcing bar composite strengthening ECC- Combined concrete T-type beam |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208235796U true CN208235796U (en) | 2018-12-14 |
Family
ID=64586881
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820231906.8U Expired - Fee Related CN208235796U (en) | 2018-01-27 | 2018-01-27 | A kind of FRP tendons-reinforcing bar composite strengthening ECC- Combined concrete T-type beam |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208235796U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110173072A (en) * | 2019-06-20 | 2019-08-27 | 福州大学 | A kind of FRP-UHPC combination T-type beam |
-
2018
- 2018-01-27 CN CN201820231906.8U patent/CN208235796U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110173072A (en) * | 2019-06-20 | 2019-08-27 | 福州大学 | A kind of FRP-UHPC combination T-type beam |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108316555A (en) | A kind of FRP tendons-reinforcing bar composite strengthening ECC- Combined concrete T-type beams | |
| Mali et al. | Experimental evaluation of bamboo reinforced concrete beams | |
| CN101481930B (en) | Construction structure for textile reinforced composite reinforced bar concrete and manufacturing method thereof | |
| CN107605103A (en) | A kind of FRP tendons reinforcing bar composite strengthening ECC/ concrete combination columns | |
| Yin et al. | Flexural behavior of reinforced concrete beams with TRC tension zone cover | |
| Yost et al. | Shear strength of normal strength concrete beams reinforced with deformed GFRP bars | |
| CN205063178U (en) | Engineered cementitious composites combination beam component | |
| CN107217788A (en) | Full FRP muscle enhancing ECC Combined concrete beams and preparation method thereof | |
| Yin et al. | Investigation on the flexural behavior of concrete members reinforced with epoxy resin-impregnated textiles | |
| CN110847496A (en) | FRP rib part steel fiber reinforced concrete beam and preparation method thereof | |
| CN108824696A (en) | A kind of FRP tendons seawater sea sand-UHDCC composite beam and its construction method | |
| ELWakkad et al. | Experimental study and finite element modelling of the torsional behavior of self-compacting reinforced concrete (SCRC) beams strengthened by GFRP | |
| Yin et al. | Research on flexural performance of composited RC beams with different forms of TRC permanent formwork | |
| CN208235796U (en) | A kind of FRP tendons-reinforcing bar composite strengthening ECC- Combined concrete T-type beam | |
| Saravanan et al. | Joint shear strength of FRP reinforced concrete beam-column joints | |
| Shakir et al. | Hybrid curved precast deep beams composed partially from concrete made with recycled concrete aggregate | |
| Cheng et al. | Flexural behavior of RC beams enhanced with carbon textile and fiber reinforced concrete | |
| CN109555270A (en) | A kind of casing-FRP composite reinforcing material and preparation method thereof | |
| Kumar et al. | Investigation of HFRC beams retrofitted using GFRP for enhancement in flexural capacity | |
| CN107795071A (en) | A kind of non-adhesive superhigh tenacity cement-base composite material functionally gradient beam and method | |
| CN107859242A (en) | A kind of outsourcing PVC FRP tendons i shaped steel regeneration concrete combination beam | |
| Brühwiler et al. | Strengthening of existing structures using R-UHPFRC: principles and conceptual design | |
| CN207405875U (en) | A kind of non-adhesive superhigh tenacity cement-base composite material functionally gradient beam | |
| Orozco et al. | Energy release in fiber-reinforced plastic reinforced concrete beams | |
| CN107313552A (en) | A kind of FRP plate-concrete combination beam |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20181214 Termination date: 20200127 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |