CN114737812A - Anti-buckling steel pipe-FRP (fiber reinforced plastic) confined concrete combined member and construction method - Google Patents
Anti-buckling steel pipe-FRP (fiber reinforced plastic) confined concrete combined member and construction method Download PDFInfo
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- 238000010276 construction Methods 0.000 title claims abstract description 18
- 229920002430 Fibre-reinforced plastic Polymers 0.000 title abstract description 129
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- 230000003014 reinforcing effect Effects 0.000 claims abstract description 93
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- 238000000034 method Methods 0.000 claims description 4
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- 229920000049 Carbon (fiber) Polymers 0.000 claims description 3
- 235000014653 Carica parviflora Nutrition 0.000 claims description 3
- 241000243321 Cnidaria Species 0.000 claims description 3
- 229920006231 aramid fiber Polymers 0.000 claims description 3
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 3
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- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
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Abstract
The invention discloses a buckling-restrained steel pipe-FRP (fiber reinforced plastic) confined concrete combined member and a construction method thereof. According to the invention, the high-strength mixture layer is arranged, so that a reinforcing key is conveniently arranged, the synergistic effect of composite restraint of the steel pipe, the high-strength mixture layer and the FRP winding forming pipe is provided, the interface of each layer is prevented from entering a separation state in advance, the restraint effect on core concrete is enhanced, the reduction of the ultimate bearing capacity and the rigidity degradation of the combined member caused by premature inward and outward buckling of the steel pipe are further prevented, meanwhile, the annular fiber FRP layer and the steel pipe can be promoted to be more integrally restrained in a cooperation manner, the mechanical property of the combined column is improved, and the combined column is suitable for engineering construction in shockproof areas and offshore areas.
Description
Technical Field
The invention relates to the technical field of building structures, in particular to a buckling-restrained steel tube-FRP (fiber reinforced plastic) restrained concrete combined member and a construction method.
Background
The FRP material can be combined with concrete made of seawater and sea sand in ocean structure engineering due to excellent light weight, high strength, corrosion resistance and designability, so that the problems of reinforcement corrosion, fresh water and river sand resource shortage and high material selection, transportation and maintenance cost of building structures in offshore regions are effectively solved.
At present, in the field of civil engineering structures, the combination structure of FRP-steel composite pipe confined concrete forms a research hotspot, the member can further delay the buckling problem of a steel pipe, so that the ductility and the ultimate bearing capacity are improved, and the fiber cloth is wrapped on the surface of the outer wall of the steel pipe, although the constraint effect of the structure can be further improved, the longitudinal compressive rigidity of the fiber cloth is extremely low; the FRP pipe is bonded with the steel pipe into a whole through epoxy resin, the interface synergistic ability of the FRP pipe and the steel pipe needs to be improved, under the action of pressure or bending load, the component damage often occurs at the interface separation of the FRP pipe and the steel pipe, and the steel pipe is usually prematurely bent outwards to cause the bearing capacity failure of the combined structure.
Therefore, a buckling-restrained steel tube-FRP restrained concrete composite member which can fully utilize seawater and sea sand resources, can further enhance the synergistic capability of an FRP tube and steel tube interface, further delays inward and outward buckling of the steel tube, and is suitable for engineering construction in offshore areas and earthquake-resistant areas is needed.
Disclosure of Invention
The invention aims to provide a buckling-restrained steel pipe-FRP (fiber reinforced plastic) restrained concrete combined member and a construction method thereof, which are used for solving the problems in the prior art, and can realize the synergistic effect of composite restraint of a steel pipe, a high-strength mixture layer and an FRP winding forming pipe by arranging the high-strength mixture layer and facilitating the arrangement of a reinforcing key, so that the interface of each layer is prevented from entering a separation state in advance, the restraint effect on core concrete is enhanced, the reduction of the ultimate bearing capacity and the rigidity degradation of the combined member caused by the early inward and outward buckling of the steel pipe are further prevented, meanwhile, the circumferential fiber FRP layer and the steel pipe can be promoted to be more integrally restrained in a cooperative manner, the mechanical property of a combined column is improved, and the buckling-restrained combined steel pipe-FRP restrained combined member can be suitable for engineering construction in shockproof areas and offshore areas.
In order to achieve the purpose, the invention provides the following scheme: the invention provides a buckling-restrained steel pipe-FRP (fiber reinforced plastic) confined concrete combined member, which comprises an FRP wound forming pipe and a steel wire rope,
the steel pipe is arranged in the FRP winding forming pipe, and a high-strength mixture layer is poured between the steel pipe and the FRP winding forming pipe;
the fiber direction of the annular fiber FRP layer is arranged along the annular direction of the pipe and is fixed on the inner wall of the steel pipe, a core concrete layer is poured in the steel pipe, and the annular fiber FRP layer is positioned between the core concrete and the inner wall of the steel pipe;
the reinforced key is provided with a plurality of, and is a plurality of one side of reinforced key is fixed steel pipe outer wall, the reinforced key stretches into in the mixture layer that excels in, just the reinforced key with mixture layer rigid coupling that excels in, the other one side of reinforced key is fixed the outer wall on hoop fibre FRP layer, the reinforced key stretches into in the core concrete layer, just the reinforced key with core concrete layer rigid coupling, or the reinforced key only exists one side more than.
Preferably, the cross section of the FRP wound forming pipe is circular or rectangular, the steel pipe is positioned at the center position or eccentric position of the FRP wound forming pipe, and the cross section of the steel pipe is circular or rectangular.
Preferably, the reinforcing keys are uniformly distributed along the circumferential direction and the extending direction of the cross section of the steel pipe.
Preferably, the reinforcing keys comprise a hook type reinforcing key, a screw type reinforcing key and a plate type reinforcing key, the hook type reinforcing key is fixedly connected with the outer wall of the steel pipe, the hook type reinforcing key extends into the high-strength mixture layer and is fixedly connected with the high-strength mixture layer, the screw type reinforcing key penetrates through the annular fiber FRP layer and the steel pipe, the screw type reinforcing key is fixedly connected with the annular fiber FRP layer and the steel pipe into a whole, two sides of the screw type reinforcing key extend into the high-strength mixture layer and the core concrete layer, the plate type reinforcing key is fixedly connected with the outer wall of the steel pipe, and the plate type reinforcing key is fixedly connected with the high-strength mixture layer.
Preferably, the reinforcing key does not contact with the inner wall of the FRP wound-forming pipe.
Preferably, the concrete component of the core concrete layer can be selected from seawater, sea sand and coral aggregate, the high-strength mixture layer is one of an ultrahigh-performance concrete layer, a high-toughness fiber concrete layer and a self-compacting concrete layer, the reinforcing key is made of steel on the side fixedly connected with the high-strength mixture layer, and the reinforcing key is made of FRP (fiber reinforced plastic) on the side fixedly connected with the core concrete layer.
Preferably, the FRP winding pipe and the circumferential fiber FRP layer are made of one of a carbon fiber reinforced composite material, a glass fiber reinforced composite material, a basalt fiber reinforced composite material, an aramid fiber reinforced composite material and a large strain fiber reinforced composite material.
Preferably, the axial compressive strength of the high-strength mixture layer is not lower than that of the core concrete layer.
A construction method of a buckling-restrained steel tube-FRP restrained concrete combined member,
s1, selecting materials: selecting a proper FRP winding forming pipe, a high-strength mixture layer, a circumferential fiber FRP layer, a steel pipe, a reinforcing key and a core concrete layer according to the FRP type and the height-diameter ratio of the buckling-restrained steel pipe-FRP constraint concrete combined member, the cross section shapes of the FRP winding forming pipe and the steel pipe, the thickness and the type of the high-strength mixture layer, the forming type and the thickness of the circumferential fiber FRP layer, the shape, the material, the connection mode and the arrangement density of the reinforcing key and the type of the core concrete layer;
s2, laying a circumferential fiber FRP layer: paving an annular fiber FRP layer on the inner wall of the steel pipe, and fixedly bonding the annular fiber FRP layer and the inner wall of the steel pipe in an adhesive manner;
s3, installing a reinforcing key: fixing a reinforcing key on the outer wall of the steel pipe and the outer wall of the annular fiber FRP layer;
s4, positioning the steel pipe: positioning the steel pipe according to the central or eccentric position in the FRP winding forming pipe;
s5, pouring a high-strength mixture layer: pouring a high-strength mixture between the steel pipe and the FRP winding forming pipe to form a prefabricated composite pipe fixedly connected with the steel pipe, the FRP winding forming pipe and the reinforcing key;
s6, pouring a core concrete layer: and pouring core concrete into the prefabricated composite pipe.
Preferably, the fiber winding directions of the FRP wound-form pipe and the hoop fiber FRP layer are unidirectional, in step S2, the hoop fiber FRP layer is fixedly connected to the inner wall of the steel pipe by a wet adhesion method or the hoop fiber FRP layer is a factory-prefabricated FRP wound-form pipe, and the hoop fiber FRP layer is fixedly connected to the inner wall of the steel pipe by epoxy resin.
The invention discloses the following technical effects:
1. through placing the mix thing layer that excels in between steel pipe and FRP winding forming tube to through the reinforcing key on the steel pipe outer wall and the fastening of the mix thing layer that excels in, the mix thing layer that excels in has bigger interface bonding strength to steel pipe and FRP winding forming tube, makes three kinds of materials be a firm compound whole of combination, slows down the bucking of steel pipe and prevents to take place the interface off-state under the loading effect.
2. By arranging the reinforcing key, under the action of axial load and earthquake, the local and overall outward buckling of the steel pipe can be delayed, sufficient lateral rigidity is provided, vibration energy is effectively dissipated, and the overall rigidity and the ultimate bearing capacity of the buckling-restrained steel pipe-FRP restrained concrete combined member are greatly improved. In addition, strengthen the key installation comparatively easy, its practicality is high.
3. The steel pipe has the function of improving the integral restraint, and plays the role of greatly improving the axial bearing capacity and the bending resistance of the combined member.
4. The annular fiber FRP layer and the FRP winding forming pipe not only have a constraint effect on the high-strength mixture layer and the core concrete, but also have an anti-corrosion effect on the steel pipe and avoid the corrosion effect of the outside on the combined member.
5. The invention has wide practicability, good aesthetic property and convenient construction, can be suitable for different length-diameter ratios, types of the annular fiber FRP layers, the cross section shapes and relative positions of the FRP wound forming pipes and the steel pipes, the shapes and sizes of the reinforcing keys, materials and connecting modes, and can produce a large number of prefabricated outer composite pipes fixedly connected with the annular fiber FRP layers, the steel pipes, the reinforcing key high-strength mixture layers and the FRP wound forming pipes according to design requirements; the pipe diameter of steel pipe and FRP winding forming tube is close, be favorable to the tensile strength of make full use of steel pipe, improve the bending resistance of composite member, strengthen the adjustable FRP winding forming tube inner wall surface of pressing close to of key simultaneously, play the assistance-localization real-time effect, and FRP winding forming tube and steel pipe can regard as the template on mix layer that excels in, directly water and smash core concrete after watering and smashing and forming prefabricated outer composite tube, it is convenient to be under construction, effectively reduces construction human error, accurate positioning, pour the shaping high quality.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a perspective view of a square outside and round inside configuration;
FIG. 2 is a perspective view of an outer-square and inner-square configuration;
FIG. 3 is a perspective view of an eccentric structure of the outer circle and the inner circle;
FIG. 4 is a perspective view of the outer circle and inner circle center structure;
FIG. 5 is a schematic illustration of a hook type reinforcement key connection;
FIG. 6 is a schematic view of the hook type reinforcing key;
FIG. 7 is a schematic view of a screw type reinforced key connection;
FIG. 8 is a schematic view of a screw type reinforcing key;
FIG. 9 is a schematic diagram of a blade-type reinforcing key connection;
FIG. 10 is a schematic view of a plate-type reinforcing key;
FIG. 11 is a perspective view showing the steel pipe and hook type reinforcing key joint of example 1;
FIG. 12 is a perspective view showing the connection of the steel pipe and the screw type reinforcing key of example 1;
FIG. 13 is a perspective view showing the steel pipe and lath-shaped reinforcing key of example 1;
FIG. 14 is a perspective view of the steel pipe and reinforcing key joint of example 2;
wherein, 1, winding the FRP into a forming tube; 2. a steel pipe; 3. a high strength blend layer; 4. a circumferential fiber FRP layer; 5. a core concrete layer; 6. a hook-type reinforcing key; 7. screw-type reinforcing keys; 8. a plate-type reinforcing key; 9. a reinforcing rod; 10. reinforcing the cap; 11. and (7) reinforcing the ring.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Example 1
Referring to fig. 1-14, a buckling restrained steel tube-FRP confined concrete composite member comprises an FRP wound-forming tube 1 and a steel tube 2 disposed in the FRP wound-forming tube 1, wherein a high-strength mixture layer 3 is poured between the steel tube 2 and the FRP wound-forming tube 1; the annular fiber FRP layer 4 is arranged in the annular direction of the pipe and fixed on the inner wall of the steel pipe 2, a core concrete layer 5 is poured in the steel pipe 2, and the annular fiber FRP layer 4 is positioned between the core concrete and the inner wall of the steel pipe 2; the reinforcement key is provided with a plurality of, and one side of a plurality of reinforcement keys is fixed at 2 outer walls of steel pipe, and the reinforcement key stretches into in the high-strength mixture layer 3, and reinforcement key and the 3 rigid couplings of the mixture layer that excels in, and the outer wall at hoop fibre FRP layer 4 is fixed to the other one side of reinforcement key, and the reinforcement key stretches into in core concrete layer 5, and reinforcement key and the 5 rigid couplings of core concrete layer, or reinforcement key only exists above one side.
At first, lay FRP in steel pipe 2 in order to form hoop fibre FRP layer 4 for hoop fibre FRP layer 4 closely laminates on the inner wall surface of steel pipe 2, welds the reinforcement key at 2 outer walls of steel pipe afterwards, and the reinforcement key welding finishes the back, puts into FRP winding forming tube 1 with steel pipe 2, and fixes a position steel pipe 2, pours the high-strength mixture afterwards and forms high-strength mixture layer 3, pours the core concrete and forms the core concrete layer.
According to the further optimized scheme, the cross section of the FRP wound forming pipe 1 is circular or rectangular, the steel pipe 2 is located at the center position or eccentric position of the FRP wound forming pipe 1, and the cross section of the steel pipe 2 is circular or rectangular. The FRP winding forming pipe 1 and the steel pipe 2 can be in the structure of inner circle and outer square, outer circle and inner square, inner and outer square or inner and outer circle. Further, the steel pipe 2 may be positioned at the center position or the eccentric position of the FRP wound pipe 1. On this basis, at steel pipe 2 outer wall welding reinforcing key, it further improves the connection effect of high-strength mixture layer 3 and steel pipe 2 outer wall for both are difficult for breaking away from.
Further optimizing the scheme, strengthen the key along 2 cross section direction circumference of steel pipe and extending direction evenly distributed. The quantity of reinforcing key needs to be confirmed according to the component size, and wherein the reinforcing key evenly sets up in the circumference of steel pipe 2, has improved the effect of being connected of the mixture layer that excels in and steel pipe 2 on the one hand, and on the other hand, the even setting of reinforcing key makes things convenient for steel pipe 2 to fix a position to be convenient for construct, and shorten the required time of construction.
Further optimization scheme, strengthen the key including crotch type reinforced key 6, screw type reinforced key 7 and lamella type reinforced key 8, crotch type reinforced key 6 and 2 outer wall rigid couplings of steel pipe, crotch type reinforced key 6 stretches into in the high-strength mixture layer 3 and with the 3 rigid couplings of high-strength mixture layer, screw type reinforced key 7 runs through hoop fibre FRP layer 4 and steel pipe 2, screw type reinforced key 7 concreties integratively with hoop fibre FRP layer 4 and steel pipe 2, screw type reinforced key 7 both sides stretch into high-strength mixture layer 3 and core concrete layer 5, lamella type reinforced key 8 and 2 outer wall rigid couplings of steel pipe, lamella type reinforced key 8 and 3 rigid couplings of high-strength mixture layer.
When the reinforcing key is a hook-type reinforcing key 6, the hook-type reinforcing key 6 includes a straight edge and a hook edge, one end of the straight edge is fixedly connected with one end of the hook edge, one side of the straight edge is fixedly connected with the outer wall of the steel pipe, the hook edge extends into the high-strength mixture layer 3, and the hook edge is fixedly connected with the high-strength mixture layer 3. Straight flange and crotch limit all set up along the extending direction of steel pipe 2, and the straight flange has longer side, make its can be better with 2 outer wall connections of steel pipe, and the setting on crotch limit has not only increased the area of contact of reinforcing key with the mix thing layer 3 that excels in, has improved joint strength between them, simultaneously, when steel pipe 2 warp, the crotch limit prevents under the effect of the mix thing layer 3 that excels in that the steel pipe 2 warp.
In one embodiment of the invention, the hook side and the straight side are of an integrally formed structure, and the arrangement is convenient for production and processing of the reinforced key on one hand and improves the connection strength of the hook side and the straight side on the other hand.
When the reinforcing key is screw type reinforcing key 7, drill according to the certain distance at 2 outer walls of steel pipe, downthehole stiffener 9 that wears to be equipped with, 9 both ends of stiffener are located mixture layer 3 and the core concrete layer 5 of excelling in respectively, lie in core concrete one end rigid coupling on the stiffener 9 and have a reinforcement cap 10, and steel pipe 2 is located between reinforcement cap 10 and the nut, and stiffener 9 is fixed on steel pipe 2 through reinforcement cap 10 and nut. This kind of setting has further improved the joint strength of stiffener 9 and steel pipe 2 to the joint strength of steel pipe 2 and the mix thing layer 3 that excels in and the corrosivity problem that is located core concrete department stiffener 9 have been improved.
In a preferred mode of this embodiment, both ends of the reinforcing rod 9 respectively extend into the high-strength admixture layer 3 and the core concrete layer 5 by about 20mm, and a gap exists between the reinforcing rod and the FRP winding forming pipe 1.
In a preferred mode of this embodiment, the reinforcing bar 9 has a screw structure. And the nut close to one end of the steel pipe 2 is made of steel, and the reinforcing cap 10 close to one end of the annular fiber FRP layer 4 is made of FRP material.
When the reinforcing key is a plate type reinforcing key 8, the long plate is uniformly welded on the outer wall of the steel pipe 2, the long plate is positioned in the high-strength mixture layer 3, a plurality of holes are drilled in the extending direction of the long plate, and then the long plate, the annular fiber FRP layer 4 and the steel pipe 2 are adhered into a whole through epoxy resin to form the combined annular fiber FRP layer-steel composite pipe. The long plate piece that this kind of setting was passed through drilling has further improved the joint strength of steel pipe 2 and high strength mixture layer 3, and processing welding is simple and convenient moreover.
In a preferred mode of this embodiment, the annular fiber FRP layer-steel composite pipe is placed in an eccentric position in the FRP wound-forming pipe 1, the distance between the annular fiber FRP layer-steel composite pipe and the proximal end of the FRP wound-forming pipe 1 is preferably 20mm, the distance between the annular fiber FRP layer-steel composite pipe and the distal end of the FRP wound-forming pipe is preferably 40mm, the high-strength mixture layer 3 is poured between the two walls, and then the core concrete is poured inside the annular fiber FRP layer-steel pipe composite pipe, so that the reinforcing rod 9 is consolidated with the high-strength mixture layer 3 and the core concrete layer 5 for maintenance.
Further optimizing the scheme, the reinforcing key is not contacted with the inner wall of the FRP winding forming pipe 1. The existence of gaps can facilitate the compactness of the cast concrete.
According to the further optimization scheme, the concrete components of the core concrete layer 5 can be seawater, sea sand and coral aggregates, the high-strength mixture layer 3 is an ultrahigh-performance concrete layer, one of a high-toughness fiber concrete layer and a self-compacting concrete layer, the reinforcing key is made of steel on one side fixedly connected with the high-strength mixture layer 3, and the reinforcing key is made of FRP (fiber reinforced plastic) on one side fixedly connected with the core concrete layer 5. The FRP material is poor in shearing resistance, and the purpose of the FRP material is to prevent corrosion. The steel pipe end can be made of steel pipes, and the FRP layer end is made of FRP materials. The core concrete can be concrete for corroding steel materials such as seawater and sea sand.
According to the further optimized scheme, the FRP winding forming pipe 1 and the annular fiber FRP layer 4 are made of one of carbon fiber reinforced composite material CFRP, glass fiber reinforced composite material GFRP, basalt fiber reinforced composite material BFRP, aramid fiber reinforced composite material AFRP and large-strain fiber reinforced composite material PET FRP.
Further optimizing the scheme, the compressive strength of the axis of the high-strength mixture layer 3 is not lower than that of the core concrete layer 5. The strength of the high-strength admixture layer 3 is relatively high, and the thickness of the high-strength admixture layer 3 is preferably 30mm to 50 mm.
A construction method of a buckling-restrained steel pipe-FRP restrained concrete combined member,
s1, selecting materials: according to the FRP type and height-diameter ratio of the buckling-restrained steel pipe-FRP constraint concrete combined member, the cross section shapes and positions of the FRP winding forming pipe 1 and the steel pipe 2, the thickness and type of the high-strength mixture layer 3, the forming type and thickness of the annular fiber FRP layer 4, the shape, materials, connection mode and arrangement density of the reinforcing keys and the type of the core concrete layer 5, the appropriate FRP winding forming pipe 1, the high-strength mixture layer 3, the annular fiber FRP layer 4, the steel pipe 2, the reinforcing keys and the core concrete layer 5 are selected.
S2, laying a circumferential fiber FRP layer 4: and paving the annular fiber FRP layer 4 on the inner wall of the steel pipe 2, and fixedly bonding the annular fiber FRP layer 4 and the inner wall of the steel pipe 2 by gluing. And (3) paving the FRP cloth on the inner wall of the steel pipe 2 in a manual wet paving mode to ensure that the FRP cloth and the steel pipe are in contact fixation.
S3, installing a reinforcing key: and fixing the reinforcing keys on the outer wall of the steel pipe 2 and the outer wall of the annular fiber FRP layer 4. And fixing the reinforcing key on the outer wall of the steel pipe 2, placing the reinforcing key at a position corresponding to the outer wall of the steel pipe 2, and connecting the straight edge with the outer wall of the steel pipe 2 in a welding manner, thereby realizing the fixation of the reinforcing key.
S4, positioning the steel pipe 2: the steel pipe 2 is positioned according to the central or eccentric position in the FRP winding forming pipe 1. After the reinforcing key is fixed, the steel pipe 2 is placed in the FRP winding forming pipe 1, the steel pipe 2 is placed at the center or the eccentric position of the FRP winding forming pipe 1, and the reinforcing key is not contacted with the inner wall of the FRP winding forming pipe 1.
S5, pouring a high-strength mixture layer 3: and pouring a high-strength mixture between the steel pipe 2 and the FRP winding forming pipe 1 to form a prefabricated composite pipe fixedly connected with the steel pipe 2, the FRP winding forming pipe 1 and the reinforcing key. After the steel pipe 2 is positioned, firstly, pouring a high-strength mixture between the steel pipe 2 and the FRP winding forming pipe 1 to form a high-strength mixture layer 3 to form a prefabricated composite pipe.
S6, pouring a core concrete layer 5: and pouring core concrete into the prefabricated composite pipe. After the prefabricated composite pipe is formed, core concrete is poured into the steel pipe 2.
According to the further optimized scheme, the fiber winding directions of the FRP winding forming pipe 1 and the annular fiber FRP layer 4 are one-way, in the step S2, the annular fiber FRP layer 4 is fixedly connected with the inner wall of the steel pipe 2 through a wet adhesion method or the annular fiber FRP layer 4 is a factory prefabricated FRP winding forming pipe, and the annular fiber FRP layer 4 is fixedly connected with the inner wall of the steel pipe 2 through epoxy resin. The annular fiber FRP layer can be fixedly connected with the steel pipe 2 by adopting a manual wet paving method. In addition, can make it form a tubular structure at the prefabricated hoop fibre FRP layer 4 of mill, when laying hoop fibre FRP layer 4, directly put into steel pipe 2 with the tubular structure that forms in, hoop fibre FRP layer 4 should have at least 1 mm's space with steel pipe 2 inner wall this moment, place the hoop fibre FRP layer 4 and finish the back, to leading-in epoxy in the space, through making hoop fibre FRP layer 4 and steel pipe 2 inner wall connection. Adopt the mode of prefabricated hoop fibre FRP layer 4, can reduce the cost of labor on the one hand, reduce construction cost, on the other hand, directly put into steel pipe 2 with prefabricated hoop fibre FRP layer 4 in, can improve construction speed.
Example 2
As shown in fig. 14, the difference from embodiment 1 lies in that a plurality of reinforcing rings 11 are sleeved outside the steel tube 2, the outer wall of the reinforcing ring 11 has the same structure as the outer wall of the steel tube 2, a plurality of through holes are formed in the reinforcing ring 11, and the ends of the through holes penetrate through the reinforcing ring 11 and are fixedly connected with the reinforcing ring 11. By providing the reinforcing ring 11, the purpose is to further improve the connection strength of the reinforcing key and the high-strength admixture layer 3.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (10)
1. The utility model provides an anti-buckling steel pipe-FRP retrains concrete combined member, includes FRP winding forming tube (1), its characterized in that: also comprises the following steps of (1) preparing,
the steel pipe (2) is arranged in the FRP winding forming pipe (1), and a high-strength mixture layer (3) is poured between the steel pipe (2) and the FRP winding forming pipe (1);
the fiber direction of the annular fiber FRP layer (4) is arranged along the pipe annular direction and is fixed on the inner wall of the steel pipe (2), a core concrete layer (5) is poured in the steel pipe (2), and the annular fiber FRP layer (4) is positioned between the core concrete and the inner wall of the steel pipe (2);
the reinforcement key is provided with a plurality of, and is a plurality of one side of reinforcement key is fixed steel pipe (2) outer wall, the reinforcement key stretches into in the mix thing layer (3) that excels in, just the reinforcement key with mix thing layer (3) rigid coupling that excels in, the other one side of reinforcement key is fixed the outer wall on hoop fibre FRP layer (4), the reinforcement key stretches into in core concrete layer (5), just the reinforcement key with core concrete layer (5) rigid coupling, or the reinforcement key only exists more than one side.
2. The buckling restrained steel pipe-FRP restrained concrete composite member as claimed in claim 1, wherein: the cross section of the FRP wound forming pipe (1) is circular or rectangular, the steel pipe (2) is positioned at the center position or eccentric position of the FRP wound forming pipe (1), and the cross section of the steel pipe (2) is circular or rectangular.
3. The buckling restrained steel pipe-FRP restrained concrete composite member as claimed in claim 1, wherein: the reinforcing keys are uniformly distributed along the circumferential direction and the extending direction of the cross section of the steel pipe (2).
4. The buckling restrained steel pipe-FRP restrained concrete composite member as claimed in claim 1, wherein: the reinforcing keys comprise hook type reinforcing keys (6), screw type reinforcing keys (7) and plate type reinforcing keys (8), the hook-shaped reinforcing key (6) is fixedly connected with the outer wall of the steel pipe (2), the hook-shaped reinforcing key (6) extends into the high-strength mixture layer (3) and is fixedly connected with the high-strength mixture layer (3), the screw type reinforcing key (7) penetrates through the annular fiber FRP layer (4) and the steel pipe (2), the screw type reinforcing key (7) is fixedly connected with the annular fiber FRP layer (4) and the steel pipe (2) into a whole, the two sides of the screw type reinforced key (7) extend into the high-strength mixture layer (3) and the core concrete layer (5), the plate-type reinforcing key (8) is fixedly connected with the outer wall of the steel pipe (2), and the plate-type reinforcing key (8) is fixedly connected with the high-strength mixture layer (3).
5. The buckling restrained steel pipe-FRP restrained concrete composite member as recited in claim 4, wherein: the reinforced key is not contacted with the inner wall of the FRP winding forming pipe (1).
6. The buckling restrained steel pipe-FRP restrained concrete composite member as claimed in claim 1, wherein: the concrete component of core concrete layer (5) can select sea water, sea sand and coral aggregate for use, high strength mixture layer (3) is one of ultra high performance concrete layer, high tenacity fibre concrete layer and self-compaction concrete layer, the material of reinforcing bond with one side of high strength mixture layer (3) rigid coupling is steel, the material of reinforcing bond with one side of core concrete layer (5) rigid coupling is FRP material.
7. The buckling restrained steel pipe-FRP restrained concrete composite member as claimed in claim 1, wherein: the FRP winding forming pipe (1) and the annular fiber FRP layer (4) are made of one of carbon fiber reinforced Composite (CFRP), glass fiber reinforced composite (GFRP), basalt fiber reinforced composite (BFRP), aramid fiber reinforced composite (AFRP) and large-strain fiber reinforced composite (PET FRP).
8. The buckling restrained steel pipe-FRP restrained concrete composite member as claimed in claim 1, wherein: the axial compressive strength of the high-strength mixture layer (3) is not lower than that of the core concrete layer (5).
9. A construction method of a buckling restrained steel pipe-FRP restrained concrete composite member, which adopts the buckling restrained steel pipe-FRP restrained concrete composite member as claimed in claim 1, and is characterized in that:
s1, selecting materials: selecting a proper FRP winding forming pipe (1), a high-strength mixture layer (3), a hoop fiber FRP layer (4), a reinforcement key shape, a material, a connection mode and a distribution density according to the FRP type and the height-diameter ratio of the anti-buckling steel pipe-FRP constraint concrete combined member, the cross section shapes of the FRP winding forming pipe (1) and the steel pipe (2), the thickness and the type of the high-strength mixture layer (3), the forming type and the thickness of the hoop fiber FRP layer (4), and the shape, the material, the connection mode and the distribution density of the reinforcement key, and the type of a core concrete layer (5);
s2, laying a circumferential fiber FRP layer (4): paving an annular fiber FRP layer (4) on the inner wall of the steel pipe (2), and fixedly bonding the annular fiber FRP layer (4) and the inner wall of the steel pipe (2) by gluing;
s3, installing a reinforcing key: fixing the reinforcing keys on the outer wall of the steel pipe (2) and the outer wall of the annular fiber FRP layer (4);
s4, positioning steel pipe (2): positioning the steel pipe (2) according to the central or eccentric position in the FRP winding forming pipe (1);
s5, pouring a high-strength mixture layer (3): pouring a high-strength mixture between the steel pipe (2) and the FRP winding forming pipe (1) to form a prefabricated composite pipe fixedly connected with the steel pipe (2), the FRP winding forming pipe (1) and a reinforcing key;
s6, pouring a core concrete layer (5): and pouring core concrete into the prefabricated composite pipe.
10. The construction method of the buckling restrained steel tube-FRP restrained concrete composite member as recited in claim 9, wherein: the fiber winding direction of the FRP wound forming pipe (1) and the annular fiber FRP layer (4) is one-way, in step S2, the annular fiber FRP layer (4) is fixedly connected with the inner wall of the steel pipe (2) through a wet adhesion method or the annular fiber FRP layer (4) is a factory prefabricated FRP wound forming pipe, and the annular fiber FRP layer (4) is fixedly connected with the inner wall of the steel pipe (2) through epoxy resin.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101575884A (en) * | 2009-05-27 | 2009-11-11 | 清华大学 | Reinforced-fiber composite constraining anti-buckling energy-consumption steel timbering |
| CN104005567A (en) * | 2014-05-07 | 2014-08-27 | 北京工业大学 | Ultra-high-performance concrete reinforced concrete column with fiber reinforced polymers wound around steel pipe |
| WO2017185942A1 (en) * | 2016-04-29 | 2017-11-02 | 东南大学 | Steel-fiber composite material concrete combined column, and post-earthquake repair method thereof |
| CN207032669U (en) * | 2017-05-12 | 2018-02-23 | 西安理工大学 | A kind of steel tube regeneration concrete superposed column of built-in stem outsourcing FRP cloth |
| CN211775115U (en) * | 2019-11-08 | 2020-10-27 | 南京林业大学 | Steel pipe mixed concrete composite structure |
| CN113089933A (en) * | 2021-04-06 | 2021-07-09 | 华南理工大学 | Steel tube concrete column with ECC (error correction code) reinforcing protective layer and FRP (fiber reinforced plastic) confined concrete core column and construction method and application thereof |
-
2022
- 2022-05-10 CN CN202210504966.3A patent/CN114737812B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101575884A (en) * | 2009-05-27 | 2009-11-11 | 清华大学 | Reinforced-fiber composite constraining anti-buckling energy-consumption steel timbering |
| CN104005567A (en) * | 2014-05-07 | 2014-08-27 | 北京工业大学 | Ultra-high-performance concrete reinforced concrete column with fiber reinforced polymers wound around steel pipe |
| WO2017185942A1 (en) * | 2016-04-29 | 2017-11-02 | 东南大学 | Steel-fiber composite material concrete combined column, and post-earthquake repair method thereof |
| CN207032669U (en) * | 2017-05-12 | 2018-02-23 | 西安理工大学 | A kind of steel tube regeneration concrete superposed column of built-in stem outsourcing FRP cloth |
| CN211775115U (en) * | 2019-11-08 | 2020-10-27 | 南京林业大学 | Steel pipe mixed concrete composite structure |
| CN113089933A (en) * | 2021-04-06 | 2021-07-09 | 华南理工大学 | Steel tube concrete column with ECC (error correction code) reinforcing protective layer and FRP (fiber reinforced plastic) confined concrete core column and construction method and application thereof |
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