CN112081242A - Assembled integral beam-column joint provided with shape memory alloy reinforcement and construction method - Google Patents
Assembled integral beam-column joint provided with shape memory alloy reinforcement and construction method Download PDFInfo
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- CN112081242A CN112081242A CN202011060195.0A CN202011060195A CN112081242A CN 112081242 A CN112081242 A CN 112081242A CN 202011060195 A CN202011060195 A CN 202011060195A CN 112081242 A CN112081242 A CN 112081242A
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- 229910001285 shape-memory alloy Inorganic materials 0.000 title claims abstract description 119
- 238000010276 construction Methods 0.000 title claims abstract description 38
- 230000002787 reinforcement Effects 0.000 title claims abstract description 35
- 239000004567 concrete Substances 0.000 claims abstract description 54
- 239000012779 reinforcing material Substances 0.000 claims abstract description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 52
- 239000010959 steel Substances 0.000 claims description 52
- 239000000463 material Substances 0.000 claims description 33
- 239000010410 layer Substances 0.000 claims description 30
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 29
- 238000004873 anchoring Methods 0.000 claims description 16
- 238000005452 bending Methods 0.000 claims description 10
- 239000011178 precast concrete Substances 0.000 claims description 9
- 239000011241 protective layer Substances 0.000 claims description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 3
- 230000003446 memory effect Effects 0.000 claims description 3
- 239000004575 stone Substances 0.000 claims description 3
- 239000000853 adhesive Substances 0.000 claims description 2
- 230000001070 adhesive effect Effects 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 238000000034 method Methods 0.000 claims description 2
- 210000003205 muscle Anatomy 0.000 claims 1
- 230000007547 defect Effects 0.000 abstract description 3
- 208000002740 Muscle Rigidity Diseases 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 3
- 238000010008 shearing Methods 0.000 description 3
- 239000006260 foam Substances 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/30—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts being composed of two or more materials; Composite steel and concrete constructions
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/38—Connections for building structures in general
- E04B1/58—Connections for building structures in general of bar-shaped building elements
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/14—Conveying or assembling building elements
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- Joining Of Building Structures In Genera (AREA)
Abstract
The invention discloses an assembled integral beam-column joint with a shape memory alloy reinforcement and a construction method, wherein a longitudinal reinforcement of a through long beam is arranged on a prefabricated beam overlapping layer; the bottom of the U-shaped key groove at the end part of the beam and the upper overlapped layer are provided with the shape memory alloy reinforcing materials with full length, after concrete is poured, the concrete is electrified and heated, and prestress is applied to the assembled beam-column joint through deformation of the shape memory alloy reinforcing materials. The assembled beam-column joint part of the invention applies prestress by the shape memory alloy reinforcing material, can solve the defects of poor performance and easy occurrence of cracks of the assembled integral beam-column joint at the splicing part of the prefabricated part, improves the early-stage rigidity and the stress performance of the assembled integral beam-column joint, and simultaneously has simple and convenient construction and better performance of the assembled integral beam-column joint.
Description
Technical Field
The invention relates to the technical field of civil engineering, in particular to an assembled integral beam column joint with shape memory alloy reinforcements and a construction method.
Background
The assembled integral concrete beam-column node aims at realizing equal cast-in-place, and when the overall performance and the anti-seismic performance of the assembled integral beam-column node, including the parameters such as strength, rigidity, bearing capacity, energy consumption, ductility, damping coefficient and the like, are basically equal to those of the cast-in-place beam-column node, the design rules of the existing cast-in-place reinforced concrete structure are applicable, and the assembled concrete structure is easy to popularize and apply. The common design and construction scheme for assembling the integral beam-column joint is as follows: the beam column components are prefabricated units respectively, after the prefabricated beam column units are hoisted in place in a construction site, prefabricated beams on two sides of a prefabricated column are connected through connecting reinforcing steel bars, and concrete is cast in situ in the end parts of the prefabricated beams and the beam column node area to complete construction, so the beam column components are also called as cast-in-situ beam column nodes. In the assembly of the integral beam-column node, due to the requirement of assembly construction, the lower longitudinal rib of the prefabricated beam is generally not completely long or anchored in the beam-column node area, more new and old concrete contact surfaces exist in the end part of the prefabricated beam and the beam-column node area, the U-shaped key groove in the end part of the prefabricated beam reduces the effective height and width of the beam section, and the overall performance and the anti-seismic performance of the assembly of the integral beam-column node are weakened.
Therefore, when the assembled integral beam-column node is under the action of an earthquake or is stressed greatly, the end part of the prefabricated beam bears large bending moment and shearing force, meanwhile, the bonding performance and the shearing resistance of a new concrete contact surface are poor, and a vertical crack is generated between the end part of the prefabricated beam and the beam-column node area too early, so that the early strength, the rigidity, the bearing capacity and the like of the assembled integral beam-column node are weakened to a certain extent, the appearance and the normal use of the assembled integral beam-column node are influenced, and the node performance of the connection mode cannot reach the same cast-in-place performance.
Therefore, for those skilled in the art, how to effectively improve the performance of assembling the integral beam-column node becomes a technical problem to be solved in the art.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects and technical defects of the existing assembled integral beam-column joint, improve the early anti-seismic performance and the overall performance of the assembled integral beam-column joint, and limit the crack development of the end part of a precast beam and the beam-column joint area, the invention provides the assembled integral beam-column joint with the shape memory alloy reinforcement and the construction method.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
an assembled integral beam-column joint provided with shape memory alloy reinforcing materials,
the prefabricated column is a multilayer column, and concrete is not poured in the joint area of the beam and the column; the prefabricated beam is a superposed beam, and the end part of the prefabricated beam is provided with a beam end U-shaped key groove;
connecting steel bars are placed at the lower parts of the beam end U-shaped key grooves on the two sides of the prefabricated column;
the longitudinal bars of the through long beam are placed on the precast beam overlapping layer;
the bottom of the U-shaped key groove at the beam end and the superposed layer of the precast beam are respectively provided with a through long shape memory alloy bar, the shape memory alloy bar is connected with a lead, and the lead extends out of the precast beam; the connecting steel bars in the U-shaped key grooves at the beam ends are anchored by adopting bent or end plates;
the shape memory alloy rib material is provided with a non-adhesive section at the interface of the beam and the column and is anchored by adopting an end plate; the end parts of the precast beams are encrypted by stirrups.
The width of the beam end U-shaped key groove is not less than 1/3 of the width of the precast beam and not less than 150mm, the wall thickness of the precast concrete of the beam end U-shaped key groove is not less than the sum of the diameter of the stirrup and 2 times of the concrete protective layer and not less than 60mm and not more than 1/3 of the width of the precast beam.
The length of the beam-end U-shaped key groove is +50mm, the length of the connecting steel bar extends into the key groove, the length can be adjusted according to building modulus, and the length of the shape memory alloy steel bar is smaller than that of the connecting steel bar.
The lower longitudinal bars of the precast beams do not extend into the beam-column joint area and are embedded in precast concrete or bent in the beam-end U-shaped key grooves.
The selection of the connecting steel bars and the shape memory alloy bars follows the principle of a plurality of small diameters, and the diameters of the connecting steel bars and the shape memory alloy bars are not less than 14mm and not more than 28 mm; the outer surface of the shape memory alloy reinforcement is provided with ribs or concave-convex surfaces, and the bonding property with concrete is not lower than that of a connecting steel bar in a U-shaped key groove at the beam end; the upper layer and the lower layer are arranged in the U-shaped key groove at the beam end in the same layer or in the upper layer and the lower layer;
when the bonding property of the shape memory alloy reinforcing steel bar and the concrete is not lower than that of the reinforcing steel bar with the same diameter, the length of the shape memory alloy reinforcing steel bar is the same as the anchoring length of the reinforcing steel bar with the same diameter, the shape of the shape memory alloy reinforcing steel bar is linear, and the shape memory alloy reinforcing steel bar is anchored by adopting an end plate or bent anchoring.
When the width of the beam end U-shaped key groove is smaller than the width of the 1/2 beam, the shape memory alloy rib material is provided with an unbonded section, the unbonded section of the shape memory alloy rib material is arranged on the interface of the beam and the column, and the length of the unbonded section in the column and the beam end is not smaller than 5 times of the diameter of the shape memory alloy rib material.
The shape memory alloy rib material is an iron-based shape memory alloy rib material.
The invention further discloses a construction method for assembling the integral beam-column joint based on the arrangement of the shape memory alloy reinforcement, which comprises the following steps:
step 1: firstly, hoisting construction of a plurality of layers of prefabricated columns is carried out, the upper prefabricated column and the lower prefabricated column are connected through column longitudinal ribs, the prefabricated columns are connected with a foundation or a lower component through grouting sleeves or corrugated pipes, and temporary supports are arranged after the construction of the prefabricated columns is finished;
step 2: after the installation construction of the precast columns is finished, hoisting the precast beams, wherein a gap of 20-40 mm is reserved between the precast beams and the precast columns to facilitate the construction, and after the precast beams are hoisted in place, whether the positions of the precast beams in three directions are accurate is checked;
and step 3: after the precast beam is installed in place, placing connecting reinforcing steel bars and shape memory alloy reinforcing steel bars at the bottom of the U-shaped key groove at the beam end, fixing the connecting reinforcing steel bars and the shape memory alloy reinforcing steel bars, and then placing full-length longitudinal ribs and shape memory alloy reinforcing steel bars on the precast beam laminated layer; the lengths of the upper part and the lower part of the shape memory alloy bar material are smaller than the length of the connecting bar, the thickness of the protective layer of the connecting bar and the shape memory alloy bar material meets the requirements of the current regulation and is not smaller than 20mm, and the shape memory alloy bar material is not in direct contact with the connecting bar; finally, arranging a closed part of the precast beam opening stirrup and stirrups in a precast column joint area;
and 4, step 4: after the construction of the steel bars of the integral beam-column nodes to be assembled is completed, templates are arranged at the three positions of the end part of the precast beam, the beam-column node area and the precast beam superposed layer, then concrete is poured, the poured concrete adopts fine stone concrete with the grade higher than the strength of the precast concrete by one grade, the poured concrete adopts concrete without shrinkage or micro expansion, stirrups are encrypted at the end part of the precast beam, and the length of the encrypted area is taken according to the length of the encrypted area of the cast-in-place beam and is not less than the length of the key groove plus 100 mm.
When the concrete is poured and vibrated, the reinforcing steel bars are ensured not to be disturbed, the conducting wires connected on the shape memory alloy reinforcing steel bars are not damaged, the rubber hoses are sleeved outside the conducting wires for protection, and the concrete at the joint part is tightly filled;
and 5: after the construction of the precast beam is finished and the strength of post-cast concrete reaches more than 60% of the designed strength, connecting the conducting wires on the shape memory alloy reinforcing materials with an alternating current power supply, electrifying and heating the shape memory alloy reinforcing materials, and applying prestress on the concrete in the node area of the assembled beam column by the shape memory alloy reinforcing materials under the driving of the shape memory effect.
The lower part of the U-shaped key slot at the beam end is provided with a connecting steel bar and a shape memory alloy steel bar, the reinforcement area of the shape memory alloy steel bar is determined by calculating the prestress level of the shape memory alloy steel bar, and the reinforcement area of the connecting steel bar is reduced by replacing part of the steel bars according to the equal strength principle.
The inner wall of the U-shaped key groove at the beam end is subjected to scabbling treatment, and the roughness of the concrete surface meets the requirements of the existing regulations;
when the length of the connecting steel bar in the U-shaped key groove at the beam end is linear, the requirements of concrete structure design specification GB50010-2010 and concrete structure construction drawing plane integral representation method drawing rules and structure detail drawing 16G101-1 current regulations need to be met, and bending anchoring and end plate anchoring are adopted; when the diameter of the connecting steel bar is larger than 22 mm, bending anchoring or end plate anchoring is adopted.
Has the advantages that:
the assembled integral beam-column joint provided with the shape memory alloy reinforcement and the construction method have the following beneficial effects:
according to the invention, the prestress is applied to the post-cast concrete in the assembled integral beam-column joint area through the shape memory alloy reinforcement, so that the connection performance of the end part of the prefabricated beam and the cast-in-place beam-column joint can be improved, the shearing resistance of the contact surface of the new and old concrete is improved, the development of concrete cracks on the contact surface of the prefabricated beam and the beam-column joint area is limited, the early rigidity and the overall performance of the assembled integral beam-column joint are improved, the discontinuous weakening of the contact surface of the new and old concrete and the beam longitudinal reinforcement in the assembled beam-column joint area on the performance of the assembled integral beam-column joint is reduced, and the performance target equal to or superior to.
Drawings
FIG. 1 shows a shape memory alloy reinforcement fabricated beam-column joint.
FIG. 2 is a partial unbonded shape memory alloy reinforcement fabricated beam-column joint.
FIG. 3 is an end anchored partially unbonded shape memory alloy rebar fabricated beam-column node.
Fig. 4 is a fabricated beam-column node type a with a shorter keyway.
Fig. 5 is a fabricated beam-column node type B with a shorter keyway.
FIG. 6 is a structural diagram of a shape memory alloy rib in an assembled beam-column joint.
Fig. 7 is a cross section of the precast beam end when the width of the key groove is small.
Fig. 8 is a cross section of the precast beam end when the width of the key groove is large.
Fig. 9 precast beam middle section.
Wherein: 1-precast beam, 2-precast beam laminated layer, 3-beam end U-shaped key groove, 4-precast beam laminated layer through long longitudinal bar, 5-upper shape memory alloy bar, 6-precast beam stirrup, 7-precast beam lower longitudinal bar, 8-beam end U-shaped key groove internal connection bar, 9-lower shape memory alloy bar, 10-shape memory alloy bar non-binding section, 11-precast concrete, 12-cast-in-place concrete, 13-precast column, 14-precast column longitudinal bar, 15-precast column stirrup, 16-shape memory alloy bar end part anchor, 17-precast beam lower longitudinal bar bending anchor, 18-key groove internal connection bar bending anchor, 19-shape memory alloy bar connection wire, 20-alternating current power supply, 21-nut, 22-anchoring steel plates, 23-screwing on the shape memory alloy reinforcements, 24-rubber hoses and 25-filling foams.
Detailed Description
The invention will be further explained with reference to the drawings.
As shown in fig. 2 to 5, the assembled integral beam-column node provided with the shape memory alloy reinforcement comprises a precast beam 1 and a precast column 13; the end part of the precast beam 1 is provided with a beam end U-shaped key groove 3, the upper part of the precast beam 1 is a post-cast laminated layer 2, the precast beam stirrup is an opening stirrup 6, the lower longitudinal reinforcement 7 of the precast beam is positioned in precast concrete 12, and the lower longitudinal reinforcement 7 of the precast beam can also be anchored in the beam end U-shaped key groove 3 through bending 18; the width of the beam end U-shaped key groove 3 reserved at the end part of the precast beam is not smaller than 1/3 of the width of the beam and not smaller than 150 mm.
The prefabricated column 13 is a multilayer prefabricated column, the upper and lower layers of prefabricated columns are connected through column longitudinal ribs 14, and column stirrups 15 are not arranged in the rest of beam column joints.
The connecting steel bars 8 and the shape memory alloy steel bars 9 are placed in the beam-end U-shaped key grooves 3, and the through-length longitudinal steel bars 4 and the shape memory alloy steel bars 5 are placed on the upper portion of the precast beam. And concrete 12 is poured in the beam-end U-shaped key groove 3, the precast beam laminated layer 2 and the beam-column joint area. The length of the shape memory alloy bar 9 in the U-shaped key groove 3 of the beam end is not larger than the length of the connecting steel bar 8 in the key groove 3;
as shown in fig. 2, 3, 5 and 6, when the width of the beam end U-shaped key slot 3 at the end of the precast beam is smaller than 1/4 of the beam width, the shape memory alloy rib in the beam end U-shaped key slot 3 and in the precast beam laminated layer 2 should be provided with the unbonded section 10, the length L1 of the unbonded section 10 to be provided with the shape memory alloy rib should not be smaller than 5 times of the diameter of the shape memory alloy rib, the unbonded section 10 to be provided with the shape memory alloy rib is realized by arranging the rubber hose 24 and the filling foam 25 on the surface of the rib, the shape memory alloy rib is connected with the alternating current power supply 20 through the lead 19, and after the construction is finished, the integral beam column node is electrically heated to apply prestress to the assembled beam column node.
As shown in fig. 3-6, in order to reduce the length and the amount of the shape memory alloy bar material and save the material cost, the shape memory alloy bar material can adopt the shape memory alloy bar material end anchoring 16, at this time, a thread 23 needs to be processed in advance at the end of the shape memory alloy bar material, the anchoring steel plate 22 is fixed by a matched nut 21 before construction, and the net area of the anchoring steel bar 22 is not less than 4 times of the area of the shape memory alloy bar material.
As shown in fig. 4 and 5, in order to reduce the length of the pre-fabricated beam end portion reserved beam end U-shaped key slot 3, the pre-fabricated beam lower portion longitudinal rib 7 can be anchored in the beam end U-shaped key slot through the pre-fabricated beam lower portion longitudinal rib bending anchor 17, at this time, the shape memory alloy rib can adopt the shape memory alloy rib end portion anchor 16, and the key slot internal connection reinforcing steel bar 8 adopts the key slot internal connection reinforcing steel bar bending anchor 18.
As shown in fig. 7-9, the connecting steel bars 8 and the shape memory alloy bars 9 in the beam-end U-shaped key slot 3 can be arranged in a double layer, or in a single layer when the width of the beam-end U-shaped key slot 3 is large; the thickness of the protective layer and the distance between the reinforcing bars of the connecting reinforcing bars 8 and the shape memory alloy reinforcing bars 9 need to meet the requirements of the current regulations.
The invention also provides a construction method for assembling the integral beam-column joint with the shape memory alloy reinforcement, which takes the figures 2 and 6 as examples and comprises the following steps:
step 1: firstly, hoisting construction of a plurality of layers of prefabricated columns 13 is carried out, the upper prefabricated column 13 and the lower prefabricated column 13 are connected through column longitudinal ribs 14, the prefabricated columns are connected with a foundation or a lower component through grouting sleeves or corrugated pipes, and temporary supports are arranged after the construction of the prefabricated columns is finished;
step 2: after the installation construction of the precast column 13 is finished, hoisting the precast beam 1, wherein a gap of 20-40 mm is formed between the precast beam and the precast column to facilitate the construction, and after the precast beam is hoisted in place, whether the positions of the precast beam in three directions are accurate is checked;
and step 3: after the precast beam is installed in place, placing and fixing a connecting steel bar 8 and a shape memory alloy steel bar 9 at the bottom of the beam-end U-shaped key groove 3, wherein the end part of the shape memory alloy steel bar 9 is connected with a lead 19, and the lead extends out of the precast beam; then placing a through-length longitudinal bar 4 and a shape memory alloy bar 5 on the precast beam laminated layer, wherein the length of the shape memory alloy bar is smaller than that of the connecting steel bar 8, and the thickness of the protective layer of the connecting steel bar and the shape memory alloy bars 5 and 9 is required to be noticed, and the shape memory alloy bar is not in direct contact with the steel bar; finally, arranging a closed part of the precast beam opening stirrup 6 and stirrups in a precast column joint area;
and 4, step 4: after the construction of the steel bars of the assembled integral beam-column nodes is completed, templates are arranged at the end parts of the precast beams, the beam-column node areas, the precast beam laminated layer 2 and the like, then concrete 12 is poured, the poured concrete 12 adopts fine stone concrete with the strength higher than that of the precast concrete 11 by one grade, the poured concrete 12 adopts concrete without shrinkage or micro expansion, the steel bars are ensured not to be disturbed when the poured concrete is vibrated, the conducting wires 19 connected on the shape memory alloy steel bars 5 and 9 are not damaged, and the concrete at the joint parts is tightly filled;
and 5: after the precast beam construction is finished and the strength of the post-cast concrete 12 reaches more than 60% of the designed strength, connecting the conducting wires 19 on the shape memory alloy reinforcements with an alternating current power supply 20, electrifying and heating the shape memory alloy reinforcements 5 and 9, and applying prestress on the concrete in the assembled beam-column joint area by the shape memory alloy reinforcements 5 and 9 under the driving of the shape memory effect.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (10)
1. The utility model provides a set up integral beam column node of assembly of shape memory alloy muscle material which characterized in that:
the prefabricated column is a multilayer column, and concrete is not poured in the joint area of the beam and the column; the prefabricated beam is a superposed beam, and the end part of the prefabricated beam is provided with a beam end U-shaped key groove;
connecting steel bars are placed at the lower parts of the beam end U-shaped key grooves on the two sides of the prefabricated column;
the longitudinal bars of the through long beam are placed on the precast beam overlapping layer;
the bottom of the U-shaped key groove at the beam end and the superposed layer of the precast beam are respectively provided with a through long shape memory alloy bar, the shape memory alloy bar is connected with a lead, and the lead extends out of the precast beam; the connecting steel bars in the U-shaped key grooves at the beam ends are anchored by adopting bent or end plates;
the shape memory alloy rib material is provided with a non-adhesive section at the interface of the beam and the column and is anchored by adopting an end plate; the end parts of the precast beams are encrypted by stirrups.
2. The assembled integral beam-column joint provided with the shape memory alloy reinforcement material as recited in claim 1, wherein: the width of the beam end U-shaped key groove is not less than 1/3 of the width of the precast beam and not less than 150mm, the wall thickness of the precast concrete of the beam end U-shaped key groove is not less than the sum of the diameter of the stirrup and 2 times of the concrete protective layer and not less than 60mm and not more than 1/3 of the width of the precast beam.
3. The assembled integral beam-column joint provided with the shape memory alloy reinforcement material as recited in claim 1, wherein: the length of the beam-end U-shaped key groove is +50mm, the length of the connecting steel bar extends into the key groove, the length can be adjusted according to building modulus, and the length of the shape memory alloy steel bar is smaller than that of the connecting steel bar.
4. The assembled integral beam-column joint provided with the shape memory alloy reinforcement material as recited in claim 1, wherein: the lower longitudinal bars of the precast beams do not extend into the beam-column joint area and are embedded in precast concrete or bent in the beam-end U-shaped key grooves.
5. The assembled integral beam-column joint provided with the shape memory alloy reinforcement material as recited in claim 1, wherein: the selection of the connecting steel bars and the shape memory alloy bars follows the principle of a plurality of small diameters, and the diameters of the connecting steel bars and the shape memory alloy bars are not less than 14mm and not more than 28 mm; the outer surface of the shape memory alloy reinforcement is provided with ribs or concave-convex surfaces, and the bonding property with concrete is not lower than that of a connecting steel bar in a U-shaped key groove at the beam end; the upper layer and the lower layer are arranged in the U-shaped key groove at the beam end in the same layer or in the upper layer and the lower layer;
when the bonding property of the shape memory alloy reinforcing steel bar and the concrete is not lower than that of the reinforcing steel bar with the same diameter, the length of the shape memory alloy reinforcing steel bar is the same as the anchoring length of the reinforcing steel bar with the same diameter, the shape of the shape memory alloy reinforcing steel bar is linear, and the shape memory alloy reinforcing steel bar is anchored by adopting an end plate or bent anchoring.
6. The assembled integral beam-column joint provided with the shape memory alloy reinforcement material as recited in claim 1, wherein: when the width of the beam end U-shaped key groove is smaller than the width of the 1/2 beam, the shape memory alloy rib material is provided with an unbonded section, the unbonded section of the shape memory alloy rib material is arranged on the interface of the beam and the column, and the length of the unbonded section in the column and the beam end is not smaller than 5 times of the diameter of the shape memory alloy rib material.
7. The assembled integral beam-column joint provided with the shape memory alloy reinforcement material as recited in claim 1, wherein: the shape memory alloy rib material is an iron-based shape memory alloy rib material.
8. A construction method for assembling an integral beam-column joint based on any one of claims 1-7 and provided with shape memory alloy reinforcements is characterized by comprising the following steps:
step 1: firstly, hoisting construction of a plurality of layers of prefabricated columns is carried out, the upper prefabricated column and the lower prefabricated column are connected through column longitudinal ribs, the prefabricated columns are connected with a foundation or a lower component through grouting sleeves or corrugated pipes, and temporary supports are arranged after the construction of the prefabricated columns is finished;
step 2: after the installation construction of the precast columns is finished, hoisting the precast beams, wherein a gap of 20-40 mm is reserved between the precast beams and the precast columns to facilitate the construction, and after the precast beams are hoisted in place, whether the positions of the precast beams in three directions are accurate is checked;
and step 3: after the precast beam is installed in place, placing connecting reinforcing steel bars and shape memory alloy reinforcing steel bars at the bottom of the U-shaped key groove at the beam end, fixing the connecting reinforcing steel bars and the shape memory alloy reinforcing steel bars, and then placing full-length longitudinal ribs and shape memory alloy reinforcing steel bars on the precast beam laminated layer; the lengths of the upper part and the lower part of the shape memory alloy bar material are smaller than the length of the connecting bar, the thickness of the protective layer of the connecting bar and the shape memory alloy bar material meets the requirements of the current regulation and is not smaller than 20mm, and the shape memory alloy bar material is not in direct contact with the connecting bar; finally, arranging a closed part of the precast beam opening stirrup and stirrups in a precast column joint area;
and 4, step 4: after the construction of the steel bars of the assembled integral beam-column nodes is completed, templates are arranged at the three positions of the end part of the precast beam, the beam-column node area and the precast beam superposed layer, then concrete is poured, the poured concrete adopts fine stone concrete with the grade higher than the strength of the precast concrete by one grade, the poured concrete adopts concrete without shrinkage or micro expansion, stirrups are encrypted at the end part of the precast beam, and the length of the encryption area is taken according to the length of the encryption area of the cast-in-place beam and is not less than the length of the key groove plus 100 mm;
when the concrete is poured and vibrated, the reinforcing steel bars are ensured not to be disturbed, the conducting wires connected on the shape memory alloy reinforcing steel bars are not damaged, the rubber hoses are sleeved outside the conducting wires for protection, and the concrete at the joint part is tightly filled;
and 5: after the construction of the precast beam is finished and the strength of post-cast concrete reaches more than 60% of the designed strength, connecting the conducting wires on the shape memory alloy reinforcing materials with an alternating current power supply, electrifying and heating the shape memory alloy reinforcing materials, and applying prestress on the concrete in the node area of the assembled beam column by the shape memory alloy reinforcing materials under the driving of the shape memory effect.
9. The construction method for assembling the integral beam-column joint with the shape memory alloy reinforcement material as recited in claim 8, wherein: the lower part of the U-shaped key slot at the beam end is provided with a connecting steel bar and a shape memory alloy steel bar, the reinforcement area of the shape memory alloy steel bar is determined by calculating the prestress level of the shape memory alloy steel bar, and the reinforcement area of the connecting steel bar is reduced by replacing part of the steel bars according to the equal strength principle.
10. The construction method for assembling the integral beam-column joint with the shape memory alloy reinforcement material as recited in claim 8, wherein: the inner wall of the U-shaped key groove at the beam end is subjected to scabbling treatment, and the roughness of the concrete surface meets the requirements of the existing regulations;
when the length of the connecting steel bar in the U-shaped key groove at the beam end is linear, the requirements of concrete structure design specification GB50010-2010 and concrete structure construction drawing plane integral representation method drawing rules and structure detail drawing 16G101-1 current regulations need to be met, and bending anchoring and end plate anchoring are adopted; when the diameter of the connecting steel bar is larger than 22 mm, bending anchoring or end plate anchoring is adopted.
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Application publication date: 20201215 Assignee: Fubai new material (Zhejiang) Co.,Ltd. Assignor: SOUTHEAST University Contract record no.: X2024320000008 Denomination of invention: Assembly of integral beam column nodes and construction methods using shape memory alloy reinforcement materials Granted publication date: 20220513 License type: Common License Record date: 20240321 |