CN111021234A - Self-resetting circular steel tube restrained reinforced concrete pier externally-wrapped column base node - Google Patents
Self-resetting circular steel tube restrained reinforced concrete pier externally-wrapped column base node Download PDFInfo
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- CN111021234A CN111021234A CN201911305606.5A CN201911305606A CN111021234A CN 111021234 A CN111021234 A CN 111021234A CN 201911305606 A CN201911305606 A CN 201911305606A CN 111021234 A CN111021234 A CN 111021234A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
- E01D2101/268—Composite concrete-metal
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Abstract
The invention discloses an externally-wrapped column base node of a self-resetting circular steel tube constrained reinforced concrete pier, which comprises a circular steel tube, an SMA (shape memory alloy) bar, a bonding layer, a foundation and an externally-wrapped reinforced concrete layer. The post steel pipe lower extreme is provided with the basis, and in the post steel reinforcement cage set up the post steel pipe, the muscle of indulging of post steel reinforcement cage passed through the sleeve and is connected with the SMA rod, and the cover is equipped with on the SMA rod and goes the tie coat, and the SMA rod passes through the sleeve and is connected with the pre-buried muscle of indulging of basis. The outer reinforced concrete layer wraps the outer surface of the cylindrical steel pipe, and the lower end of an outer reinforced cage in the outer reinforced concrete layer is embedded into the foundation. The SMA bar has definite force transmission and can restore after earthquake, and disaster relief work after earthquake can be conveniently carried out. The steel pipe can provide the restraint effect for core concrete, improves core concrete intensity and deformability. The outer reinforced concrete layer can locally improve the bearing capacity and rigidity of the column base, prevent water from permeating and corroding the steel pipe, and can be used as an anti-collision layer, and only the outer layer concrete needs to be locally replaced after the concrete layer is damaged under the action of earthquake.
Description
Technical Field
The invention relates to the field of building structures, in particular to an externally-wrapped column base node of a self-resetting circular steel tube restrained reinforced concrete pier.
Background
The bridge system is an important component of a traffic transportation system, has important significance for national economic development, and particularly under the action of an earthquake, the bridge needs to ensure the transportation function and assist in the expansion of disaster relief and post-disaster reconstruction work. The pier is an important energy consumption component and has good energy consumption capability.
The concrete-filled steel tube bridge pier has the advantages of high bearing capacity, good ductility, excellent fire resistance and the like. But the construction of the column base joint is complex, when the end bearing type column base is adopted, the end plate is thick, the welding amount is large, the installation precision requirement is high, and the rigidity of the joint cannot easily meet the rigid joint requirement; when the column base is embedded, the embedding depth is large, the construction difficulty is increased, and the arrangement of foundation steel bars can be influenced by embedding the steel pipes. In addition, under the action of earthquake, the column base node can generate residual deformation, the repair is difficult, and the normal use of the bridge can be influenced when the damage is large. In view of this, there is a need for a column base joint that is reliable in stress, simple in construction, and easy to repair.
Disclosure of Invention
The invention aims to provide an externally-wrapped column base node which is simple in structure, reliable in force transmission and capable of realizing self-resetting and repairable functions of an abutment column.
The technical scheme adopted for achieving the purpose of the invention is that the externally-wrapped column base node of the self-resetting circular steel tube constrained reinforced concrete pier comprises a circular steel tube, a column steel reinforcement cage, an SMA (shape memory alloy) bar, a bonding layer, a foundation and an externally-wrapped reinforced concrete layer.
The column reinforcement cage, the SMA rod and the bonding layer are all arranged in the column round steel pipe, and the cross section of the column reinforcement cage is circular. The post steel reinforcement cage includes that a plurality of posts indulge muscle I, a plurality of post stirrup and two posts and indulge muscle II, and two posts are indulged the distance between the muscle II and are equal with the diameter of post steel reinforcement cage.
Every the lower extreme that muscle I was indulged to the post passes through sleeve I and is connected with the SMA rod, and the cover is equipped with on every SMA rod and goes the tie coat.
The foundation is arranged below the cylindrical steel pipe, a foundation embedded steel reinforcement cage is embedded in the foundation, and the foundation embedded steel reinforcement cage comprises a plurality of foundation embedded longitudinal reinforcements and a plurality of foundation embedded stirrups. And a plurality of foundation embedded longitudinal bars extend out of the upper surface of the foundation.
The lower end of each SMA rod is connected with the foundation embedded longitudinal bar through a sleeve I. And each column longitudinal rib II is connected with the foundation embedded longitudinal rib through a sleeve II.
The column round steel pipe is internally filled with column concrete I and column concrete II, the upper end of the column concrete II is connected with the column concrete I, and the lower end of the column concrete II is connected with the upper surface of a foundation. The lower extreme of post steel reinforcement cage, a plurality of sleeves I, two sleeves II, a plurality of upper ends of going tie coat and basic pre-buried steel reinforcement cage all are located post concrete II.
The outsourcing reinforced concrete layer parcel is provided with the outsourcing steel reinforcement cage in the surface of post circular steel tube in the outsourcing reinforced concrete layer, and the outsourcing steel reinforcement cage includes that a plurality of surrounding layers indulge muscle and a plurality of surrounding layer stirrup, and the lower extreme of muscle is indulged to a plurality of surrounding layers is pre-buried in the basis.
An externally-wrapped column base node of a self-resetting circular steel tube constrained reinforced concrete pier comprises a circular steel tube, a column steel reinforcement cage, an SMA (shape memory alloy) bar, a bonding layer and a foundation.
Column steel reinforcement cage, SMA rod and go the tie coat and all set up in post circular steel tube, and column steel reinforcement cage includes that a plurality of posts are indulged muscle I and a plurality of post stirrups.
Every the lower extreme that muscle I was indulged to the post passes through sleeve I and is connected with the SMA rod, and the cover is equipped with on every SMA rod and goes the tie coat.
The foundation is arranged below the cylindrical steel pipe, a foundation embedded steel reinforcement cage is embedded in the foundation, and the foundation embedded steel reinforcement cage comprises a plurality of foundation embedded longitudinal reinforcements and a plurality of foundation embedded stirrups. And a plurality of foundation embedded longitudinal bars extend out of the upper surface of the foundation.
The lower end of each SMA rod is connected with the foundation embedded longitudinal bar through a sleeve I.
The column round steel pipe is internally filled with column concrete I and column concrete II, the upper end of the column concrete II is connected with the column concrete I, and the lower end of the column concrete II is connected with the upper surface of a foundation. The lower extreme of post steel reinforcement cage, a plurality of sleeves I, a plurality of upper ends of going tie coat and basic pre-buried steel reinforcement cage all are located post concrete II.
The outsourcing reinforced concrete layer parcel is at the surface of post circular steel tube, outsourcing reinforced concrete layer, and outsourcing reinforced concrete layer is inside to be provided with the outsourcing steel reinforcement cage, and the outsourcing steel reinforcement cage includes that a plurality of surrounding layers indulge muscle and a plurality of surrounding layer stirrup, and the lower extreme of muscle is indulged to a plurality of surrounding layers is pre-buried in the basis.
Further, the column concrete II is concrete in the plastic hinge area, and the column concrete II is ordinary concrete or ECC.
Furthermore, the outer diameter of the cylindrical circular steel tube is D, the height of the cylindrical concrete II is D, and D is larger than 0.
The length of the SMA bar is L, and L is more than or equal to 0.2D and less than or equal to 0.5D. And the single axial tension bearing capacity of the SMA bar is greater than or equal to that of the single column longitudinal rib I.
Furthermore, a plurality of steel bar hoops or a plurality of stud shear connectors are arranged on the outer wall of the cylindrical steel pipe, which is in contact with the outer reinforced concrete layer.
Further, the lower end of the column longitudinal rib I, the lower end of the column longitudinal rib II, the two ends of the SMA bar and the upper end of the foundation embedded longitudinal rib are all subjected to threading treatment.
The sleeve I is a mechanical sleeve, and the sleeve II is a mechanical sleeve or a grouting sleeve.
Further, the bonding layer is a rubber hose, an asphalt coating or a PVC pipe.
Further, the foundation embedded stirrups are arranged in an encrypted manner in an area close to the upper surface of the foundation.
Further, the height of the outer-coated reinforced concrete layer is more than or equal to 1.5D, and the thickness of the outer-coated reinforced concrete layer is more than or equal to 120 mm. The outer cladding longitudinal bars and the outer cladding stirrups meet the requirements of the concrete pier on the minimum earthquake-resistant reinforcement ratio and the minimum reinforcement ratio.
The invention has the beneficial effects that:
1. the SMA bar in the column foot area can effectively transmit axial force and bending moment in the node area, and the deformation can be restored after earthquake, thereby being beneficial to the development of disaster relief work after earthquake;
2. the steel tube restrained reinforced concrete pier has good mechanical property, the bearing capacity and the deformation capacity of concrete can be improved under the restraining action of the steel tube, when the pier is reasonably designed, the outer reinforced concrete layer and the steel tube concrete at the top of the outer reinforced concrete layer can be utilized to cooperatively consume energy under the earthquake action, and the outer reinforced concrete layer can be normally used only by locally replacing the concrete after being damaged;
3. the steel pipe restrains the steel pipe and restrains the outer wrapping type column base steel pipe of the reinforced concrete pier to be disconnected at the top of the foundation, the steel pipe does not need to be embedded into the foundation, and the longitudinal bars are utilized to transfer the load of a node area, so that the problems of large steel pipe embedding depth and difficult foundation steel bar arrangement are solved;
4. the reinforced concrete outer cladding layer can locally improve the bearing capacity and rigidity of the column base and can be used as an anti-collision layer. In addition, the steel pipe at the column base is externally provided with a reinforced concrete outer cladding layer, so that the problem of corrosion of the steel pipe caused by water infiltration is solved;
the SMA bar and the ECC material are only partially arranged at the column base node, so that the mechanical property of the node is ensured, and the economy is also ensured;
6. the column base joint has simple structure, does not need field welding and can adapt to assembly construction.
Drawings
Fig. 1 is a schematic diagram of an externally wrapped column base joint of a self-resetting circular steel tube constrained reinforced concrete pier;
FIG. 2 is a schematic view of connection between a column longitudinal bar I and a foundation embedded longitudinal bar;
FIG. 3 is a schematic view of the connection between the column longitudinal bar II and the foundation embedded longitudinal bar;
fig. 4 is a cross-sectional view a-a of an externally wrapped column foot joint of a self-restoring round steel tube constrained reinforced concrete pier in example 1;
fig. 5 is a B-B cross-sectional view of an externally wrapped column foot joint of a self-restoring round steel tube constrained reinforced concrete pier in example 1;
fig. 6 is a C-C cross-sectional view of an externally wrapped column foot joint of a self-restoring round steel tube constrained reinforced concrete pier in example 1;
fig. 7 is a D-D cross-sectional view of an externally wrapped column foot joint of a self-restoring round steel tube constrained reinforced concrete pier in example 1;
FIG. 8 is a cross-sectional view taken along line E-E;
fig. 9 is a sectional view of a joint of the column longitudinal bar i and the foundation embedded longitudinal bar in embodiment 2.
In the figure: column circular steel tube 1, column steel reinforcement cage 2, the column is indulged muscle I201, column stirrup 202, the column is indulged muscle II 203, SMA rod 3, go tie coat 4, basis 5, basic pre-buried steel reinforcement cage 501, basic pre-buried muscle 5011, basic pre-buried stirrup 5012, sleeve I6, column concrete I8, column concrete II 9, sleeve II 10, outsourcing reinforced concrete layer 11, outsourcing steel reinforcement cage 1101, the muscle 11011 and outsourcing stirrup 11012 are indulged to the surrounding layer.
Detailed Description
The present invention is further illustrated by the following examples, but it should not be construed that the scope of the above-described subject matter is limited to the following examples. Various substitutions and alterations can be made without departing from the technical idea of the invention and the scope of the invention is covered by the present invention according to the common technical knowledge and the conventional means in the field.
Example 1:
the embodiment discloses an outer wrapping type column base node of a self-resetting circular steel tube constrained reinforced concrete pier, which comprises a circular steel tube 1, a column reinforced cage 2, an SMA (shape memory alloy) rod 3, a bonding layer 4, a foundation 5 and an outer wrapping reinforced concrete layer 11.
The column steel reinforcement cage 2, the SMA rod 3 and the bonding layer 4 are all arranged in the column circular steel tube 1, and the cross section of the column steel reinforcement cage 2 is circular. Referring to fig. 4, 5 or 6, the column reinforcement cage 2 includes a plurality of column longitudinal ribs i 201, a plurality of column hoop ribs 202, and two column longitudinal ribs ii 203, and a distance between the two column longitudinal ribs ii 203 is equal to a diameter of the column reinforcement cage 2. The lower extreme that muscle I201 was indulged to the post and the lower extreme that muscle II 203 was indulged to the post all has carried out the mantle fiber and has handled.
Referring to fig. 2, each lower end of the column longitudinal rib I201 is connected with the SMA rod 3 through a sleeve I6, a bonding layer 4 is sleeved on each SMA rod 3, and the bonding layer 4 is a rubber hose, an asphalt coating or a PVC pipe. Both ends of the SMA bar 3 are sheathed with wires, the length of the SMA bar 3 is L, L is not less than 0.2D and not more than 0.5D, D is the outer diameter of the cylindrical circular steel tube 1, and D is more than 0. The bearing capacity of single shaft pulling of 3 SMA rod materials is more than or equal to the bearing capacity of shaft pulling of single column longitudinal rib I201.
Referring to fig. 1, a foundation 5 is arranged below the cylindrical circular steel tube 1, and a foundation embedded reinforcement cage 501 is embedded in the foundation 5. Referring to fig. 8, the foundation embedded reinforcement cage 501 includes a plurality of foundation embedded longitudinal reinforcements 5011 and a plurality of foundation embedded stirrups 5012, and the embedded length of the foundation embedded longitudinal reinforcements 5011 in the foundation 5 should meet the requirement of earthquake-resistant construction. The plurality of foundation embedded longitudinal ribs 5011 extend out of the upper surface of the foundation 5, and the foundation embedded stirrups 5012 are arranged in an encrypted manner in an area close to the upper surface of the foundation 5.
Referring to fig. 2, the lower end of each SMA bar 3 is connected with a foundation embedded longitudinal rib 5011 through a sleeve i 6, and the sleeve i 6 is a mechanical sleeve. Referring to fig. 3 or 7, each column longitudinal rib ii 203 is connected with the foundation embedded longitudinal rib 5011 through a sleeve ii 10, and the sleeve ii 10 is a mechanical sleeve or a grouting sleeve. The upper end of the foundation embedded longitudinal rib 5011 is subjected to threading treatment.
Referring to fig. 1, column concrete i 8 and column concrete ii 9 are filled in the column circular steel tube 1, the upper end of the column concrete ii 9 is connected with the column concrete i 8, and the lower end is connected with the upper surface of the foundation 5. The column concrete II 9 is concrete in the plastic hinge area, the column concrete II 9 is ordinary concrete or ECC, and the height of the column concrete II 9 is D. The length that muscle I201 is indulged to the post and the setting of muscle II 203 is indulged to the post should satisfy the earthquake-resistant structure requirement in I8 of post concrete and post concrete II 9.
The lower extreme of post steel reinforcement cage 2, a plurality of sleeves I6, two sleeves II 10, a plurality of upper ends that go tie coat 4 and basis pre-buried steel reinforcement cage 501 all are located post concrete II 9.
Referring to fig. 1, the section of the external reinforced concrete layer 11 is in a circular ring shape, the external reinforced concrete layer 11 is wrapped on the outer surface of the cylindrical steel pipe 1, and an external reinforced cage 1101 is arranged in the external reinforced concrete layer 11. Referring to fig. 8, the external reinforcement cage 1101 includes a plurality of external longitudinal reinforcements 11011 and a plurality of external hoop reinforcements 11012, the lower ends of the plurality of external longitudinal reinforcements 11011 are embedded in the foundation 5, and the embedded length of the external longitudinal reinforcements 11011 in the external reinforced concrete layer 11 should meet the requirement of an earthquake-resistant structure. The cross sections of the column circular steel tube 1, the column reinforced concrete cage 2, the column concrete I8, the column concrete II 9, the outer-coated reinforced concrete layer (11) and the outer-coated reinforced concrete cage (1101) are circular, and the sections are on the same axis.
And a plurality of steel bar hoops or a plurality of stud shear connectors are arranged on the outer wall of the cylindrical steel pipe 1 contacted with the outer reinforced concrete layer 11. The height of the outer-coated reinforced concrete layer 11 is more than or equal to 1.5D, and the thickness of the outer-coated reinforced concrete layer 11 is more than or equal to 120 mm. The outer cladding longitudinal bars 11011 and the outer cladding stirrups 11012 meet the requirements of the minimum seismic reinforcement allocation rate and the minimum seismic reinforcement allocation rate of the concrete pier respectively. When the thickness of the outer reinforced concrete layer 11 exceeds 180mm, the inner longitudinal steel bars and the stirrups are additionally arranged, and the requirements of the non-anti-seismic minimum reinforcement ratio and the hoop ratio of the concrete pier are met respectively.
Example 2:
the embodiment discloses an externally-wrapped column base node of a self-resetting circular steel tube constrained reinforced concrete pier, which comprises a circular steel tube 1, a column steel reinforcement cage 2, an SMA (shape memory alloy) rod 3, a bonding layer removing layer 4 and a foundation 5.
Column steel reinforcement cage 2, SMA rod 3 and go tie coat 4 and all set up in post circular steel tube 1, and column steel reinforcement cage 2 includes that a plurality of posts indulge muscle I201 and a plurality of post stirrup 202.
Referring to fig. 2 or 3, the lower end of each column longitudinal rib i 201 is connected with an SMA bar 3 through a sleeve i 6, and a bonding layer 4 is sleeved on each SMA bar 3.
Referring to fig. 1, a foundation 5 is arranged below the cylindrical steel pipe 1, a foundation embedded reinforcement cage 501 is embedded in the foundation 5, and the foundation embedded reinforcement cage 501 comprises a plurality of foundation embedded longitudinal reinforcements 5011 and a plurality of foundation embedded stirrups 5012. A plurality of the foundation embedded longitudinal ribs 5011 extend out of the upper surface of the foundation 5.
The lower end of each SMA rod 3 is connected with a foundation embedded longitudinal rib 5011 through a sleeve I6.
Referring to fig. 1, column concrete i 8 and column concrete ii 9 are filled in the column circular steel tube 1, the upper end of the column concrete ii 9 is connected with the column concrete i 8, and the lower end is connected with the upper surface of the foundation 5. The lower extreme of post steel reinforcement cage 2, a plurality of sleeves I6, a plurality of go tie coat 4 and the pre-buried steel reinforcement cage 501's of basis upper end all is located post concrete II 9.
Outsourcing reinforced concrete layer 11 parcel is at the surface of post circular steel tube 1, outsourcing reinforced concrete layer 11, refers to fig. 8, and outsourcing reinforced concrete layer 11 is inside to be provided with outsourcing steel reinforcement cage 1101, and outsourcing steel reinforcement cage 1101 includes that a plurality of outsourcing indulge muscle 11011 and a plurality of outsourcing stirrup 11012, and the lower extreme of a plurality of outsourcing indulge muscle 11011 is pre-buried in basis 5.
Example 3:
the main structure of this embodiment is the same as that of embodiment 2, and further, the column concrete ii 9 is concrete in the plastic hinge area, and the column concrete ii 9 is ordinary concrete or ECC.
Example 4:
the main structure of the present embodiment is the same as that of embodiment 3, further, the outer diameter of the cylindrical steel pipe 1 is D, the height of the column concrete ii 9 is D, and D is greater than 0.
The length of the SMA bar 3 is L, and L is not less than 0.2D and not more than 0.5D. The bearing capacity of single shaft pulling of 3 SMA rod materials is more than or equal to the bearing capacity of shaft pulling of single column longitudinal rib I201.
Example 5:
the main structure of the present embodiment is the same as that of embodiment 4, and further, a plurality of steel bar hoops or a plurality of stud shear connectors are arranged on the outer wall of the column circular steel tube 1 contacting with the outer reinforced concrete layer 11.
Example 6:
the main structure of this embodiment is the same as that of embodiment 5, and further, the lower end of the column longitudinal rib i 201, the two ends of the SMA bar 3, and the upper end of the foundation embedded longitudinal rib 5011 are all subjected to threading treatment. The sleeve I6 is a mechanical sleeve, and the sleeve II 10 is a mechanical sleeve or a grouting sleeve.
Example 7:
the main structure of this embodiment is the same as that of embodiment 6, and further, the tack-free layer 4 is a rubber hose, an asphalt coating or a PVC pipe.
Example 8:
the main structure of this embodiment is the same as that of embodiment 7, and further, the foundation embedded stirrup 5012 is arranged in an encrypted manner in an area close to the upper surface of the foundation 5.
Example 9:
the main structure of this embodiment is the same as that of embodiment 8, and further, the height of the outer-coated reinforced concrete layer 11 is greater than or equal to 1.5D, and the thickness of the outer-coated reinforced concrete layer 11 is greater than or equal to 120 mm. The outer cladding longitudinal bars 11011 and the outer cladding stirrups 11012 meet the requirements of the minimum seismic reinforcement allocation rate and the minimum seismic reinforcement allocation rate of the concrete pier respectively.
Claims (9)
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911305606.5A CN111021234A (en) | 2019-12-18 | 2019-12-18 | Self-resetting circular steel tube restrained reinforced concrete pier externally-wrapped column base node |
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| CN201911305606.5A CN111021234A (en) | 2019-12-18 | 2019-12-18 | Self-resetting circular steel tube restrained reinforced concrete pier externally-wrapped column base node |
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Cited By (3)
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| CN113373800A (en) * | 2021-06-24 | 2021-09-10 | 上海应用技术大学 | Hollow prefabricated assembled pier adopting grouting sleeve and connecting method thereof |
| US11293183B2 (en) * | 2017-06-02 | 2022-04-05 | China State Construction Engineering Corporation Limited | Precast column base joint and construction method therefor |
| CN114457956A (en) * | 2022-01-12 | 2022-05-10 | 中建八局西南建设工程有限公司 | Large-span special-shaped steel-concrete column and construction method thereof |
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Application publication date: 20200417 |
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