CN111877546B - Fabricated frame beam-column wet joint with buckling restrained brace and construction method - Google Patents

Fabricated frame beam-column wet joint with buckling restrained brace and construction method Download PDF

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Publication number
CN111877546B
CN111877546B CN202010677597.9A CN202010677597A CN111877546B CN 111877546 B CN111877546 B CN 111877546B CN 202010677597 A CN202010677597 A CN 202010677597A CN 111877546 B CN111877546 B CN 111877546B
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column
embedded
prefabricated
precast
groove
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CN111877546A (en
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牛力军
张文芳
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Taiyuan University of Technology
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Taiyuan University of Technology
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    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04BGENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/18Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
    • E04B1/20Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of concrete, e.g. reinforced concrete, or other stonelike material
    • E04B1/21Connections specially adapted therefor
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04BGENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/18Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
    • E04B1/20Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of concrete, e.g. reinforced concrete, or other stonelike material
    • E04B1/21Connections specially adapted therefor
    • E04B1/215Connections specially adapted therefor comprising metallic plates or parts
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04CSTRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/16Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups
    • E04C5/162Connectors or means for connecting parts for reinforcements
    • E04C5/163Connectors or means for connecting parts for reinforcements the reinforcements running in one single direction
    • E04C5/165Coaxial connection by means of sleeves

Abstract

The invention belongs to the technical field of fabricated buildings, and particularly relates to a fabricated frame beam-column wet joint with buckling restrained braces and a construction method. An assembly type frame beam-column wet joint with buckling restrained braces comprises a prefabricated lower column, a prefabricated upper column, a superposed beam and a BRB mounting embedded part; the prefabricated lower column and the superposed beam are connected through a cast-in-place concrete connector, and a column bottom seam of the prefabricated upper column is arranged at the elevation of the floor; the superposed beam comprises a precast beam and a concrete cast-in-place layer at the top of the precast beam, and the beam end of the precast beam is provided with a precast groove; the BRB installation embedded part comprises a column bottom embedded part, a beam end embedded part and an ear plate, wherein the column bottom embedded part is embedded at the column bottom of the prefabricated upper column, the beam end embedded part is embedded at the beam end of the superposed beam, and the ear plate is connected with the column bottom embedded part and the beam end embedded part. The related processes of member prefabrication, construction installation and the like are relatively simple, so that the construction quality of beam column joints and the installation quality of BRB installation embedded parts can be ensured, and the popularization and the application of the technology are facilitated.

Description

Fabricated frame beam-column wet joint with buckling restrained brace and construction method
Technical Field
The invention belongs to the technical field of fabricated buildings, and particularly relates to a fabricated frame beam-column wet joint with buckling restrained braces and a construction method.
Background
The assembly type construction technology can improve the construction efficiency and the engineering quality of the building, belongs to the environment-friendly construction technology, and is an important research direction in the field of buildings in China. The fabricated concrete frame structure is a structure formed by assembling and connecting precast beams and columns. In the known art, the connection of the prefabricated beam-column joint is divided into a dry connection mode and a wet connection mode, wherein the wet connection mode is a mode of cast-in-place concrete pouring at the beam-column joint, and the connection joint belongs to a rigid joint and has the characteristics of high strength and good integrity. The frame structure adopting the wet connection mode is called an assembly integral type frame structure, the assembly integral type frame structure generally adopts a superposed beam, and the superposed beam is composed of a precast beam and a post-cast concrete superposed layer. For the fabricated concrete frame structure, the column-column longitudinal bar connection generally adopts a grouting sleeve mode, so the grouting quality of the grouting sleeve is the basis for ensuring the column-column connection quality, and the lengths of grouting and slurry outlet channels have obvious influence on the grouting quality of the grouting sleeve.
The frame structure has the advantages of flexible and large building space, wide application range and low lateral movement resistance and energy consumption. For a higher concrete frame structure in an earthquake high-intensity area, the requirement of an earthquake-resistant lateral displacement limit value cannot be met. In order to improve the shock resistance of the concrete frame structure, a shock absorption support can be arranged on the frame structure. According to different damping principles and application scenarios, damping supports have more types, and currently, a Buckling Restrained Brace (BRB) is a damping support type which is more adopted. When the BRB is installed at a beam-column joint of a cast-in-place concrete frame structure, embedded parts are generally embedded at a beam end and a column end, and the embedded parts are connected with the BRB in a bolt or welding mode.
With the mass construction of prefabricated concrete structures, the number of prefabricated concrete frame structures for installing BRBs is increasing. The difficulty in installing the BRB on the fabricated concrete frame structure is: firstly, when the composite beam is adopted, if the beam end embedded part is embedded in the prefabrication stage of the precast beam, the embedded steel plate arranged on the top of the beam can not only influence the transportation and installation of the precast beam, but also is not beneficial to the pouring of a concrete cast-in-place layer at the beam end of the composite beam; secondly, when the grouting sleeve of the prefabricated column is close to the embedded steel plate of the column bottom embedded part, the grouting and grout outlet channel needs to be lengthened, so that the grouting quality of the grouting sleeve is influenced. For the above reasons, some practical projects change the beam-column joint of the fabricated concrete frame structure from rigid connection to hinged connection to facilitate the installation of the BRB. For beam-column joints of concrete frame structures, rigid joints have better load bearing properties than hinged joints.
In summary, a beam-column wet joint structure suitable for an assembled concrete frame structure, in which BRB mounting embedded parts are arranged at beam ends and column ends, has a great deal of practical engineering requirements.
Disclosure of Invention
The invention aims to solve the problem that when a BRB is installed on a beam-column wet node of an assembly type frame, the overhead of a beam-end embedded steel plate can influence the transportation and installation of a precast beam and the pouring of superposed layer concrete at the lower part of the steel plate; the grouting and grout outlet channels of the grouting sleeve close to the column bottom embedded steel plate are lengthened, so that the grouting quality of the grouting sleeve is not guaranteed.
In order to solve the technical problem, the technical solution of the invention is as follows: the assembly type frame beam-column wet joint with the buckling restrained brace comprises a prefabricated lower column, a prefabricated upper column, a superposed beam and a BRB mounting embedded part, wherein the prefabricated lower column and the superposed beam are connected through a cast-in-place concrete connector; the column bottom joint of the prefabricated upper column is arranged at the elevation of the floor, and the column bottom joint is filled with grouting material; the elevation of the top of the prefabricated lower column is the same as the elevation of the bottom of the superposed beam; the superposed beam comprises a precast beam and a concrete cast-in-place layer at the top of the precast beam, and the beam end of the precast beam is provided with a precast groove; the concrete connector comprises cast-in-place concrete at a beam column node and cast-in-place concrete at a groove of the precast beam; the BRB installation embedded part comprises a column bottom embedded part, a beam end embedded part and an ear plate, the column bottom embedded part is embedded at the column bottom of the prefabricated upper column, the beam end embedded part is embedded at the beam end of the superposed beam, and the ear plate is connected with the column bottom embedded part and the beam end embedded part.
Furthermore, a grouting sleeve is embedded at the column bottom of the prefabricated upper column, and the upper end of the grouting sleeve is mechanically connected with the longitudinal ribs of the prefabricated upper column; the column bottom embedded part is formed by welding an embedded steel plate and an anchor bar, the embedded steel plate is provided with a screw hole, a nut is screwed on the screw hole, and the screw hole corresponds to the grouting opening and the grout outlet of the grouting sleeve;
a node column longitudinal rib extends outwards from the column top of the prefabricated lower column, and a node column stirrup is arranged on the outer side of the node column longitudinal rib; the node column longitudinal ribs are connected with the grouting sleeves in a grouting mode;
the beam top of the precast beam extends out of a closed type stirrup, a beam top longitudinal steel bar is bound on the inner side of the upper end of the closed type stirrup, the beam top longitudinal steel bar penetrates through a beam column node, and the beam end of the precast beam extends out of an anchoring section of a beam bottom longitudinal steel bar; the top surfaces of the two sides of the groove are both pre-embedded with split heads; the beam-end embedded part is formed by welding a beam-top steel plate and a beam-top anchor bar, the beam-top steel plate is placed on the split heads, and the beam-top anchor bar extends into a groove of the precast beam.
Furthermore, the bottom surface of the prefabricated upper column is provided with a key groove and a rough surface, the concave-convex depth of the rough surface is greater than or equal to 6mm, and the area of the rough surface is greater than or equal to 80% of the area of the bottom surface of the prefabricated upper column; the depth of the key groove is greater than or equal to 30mm, and the width of the key groove is greater than or equal to 3 times of the depth and less than 10 times of the depth; the distance from the notch of the key groove to the section edge of the prefabricated upper column is greater than or equal to 50 mm; the space between the key grooves is equal to the width of the key grooves; the inclination angle of the inclined plane of the end part of the key groove is less than or equal to 30 degrees.
Furthermore, the column top surface of the prefabricated lower column is provided with a rough surface, the area of the rough surface is greater than or equal to 80% of the area of the column top surface, and the concave-convex depth of the rough surface is greater than or equal to 6 mm.
Further, the wall thickness of two sides of the groove is the same, and the wall thickness of one side is greater than or equal to 1/6 of the width of the precast beam; the sum of the groove depth of the groove and the thickness of the concrete cast-in-place layer is greater than the sum of the vertical projection length of the beam top anchor bar and the thickness of the beam top steel plate; the thickness of the concrete from the groove bottom to the beam bottom of the precast beam meets the requirement of the thickness of a concrete protective layer required by the longitudinal bar of the beam bottom, and is greater than or equal to 1/4 of the section height of the precast beam; 2 split heads ribs are embedded in the top surfaces of the two sides of the groove respectively.
Furthermore, connecting reinforcing ribs are embedded at two sides of the groove and are connectedShaping; a rough surface is arranged on a joint surface between the precast beam and the concrete cast-in-place layer, rough surfaces are arranged on the end surface of the precast beam and the inner side surface and the bottom surface of the groove, and the area of the rough surface is greater than or equal to 80% of the total area of the surface where the rough surface is located; the side edge of the beam top steel plate of the beam-end embedded part is flush with the column edge of the prefabricated upper column.
The inner side surface and the bottom surface of the groove at the beam end of the precast beam are provided with rough surfaces, so that the bonding capacity of new and old concrete can be enhanced, and the integrity of the section of the beam end of the superposed beam is further improved by a method of pre-burying the connecting reinforcing ribs in the groove, so that the stability of the anchor bars of the beam end embedded part is ensured. The limit to the relevant section size of the groove aims to ensure the capability of bearing construction load of the section of the beam end groove in the construction stage, and when the groove depth of the groove does not meet the straight anchor length of the anchor bar, the anchor bar of the beam end embedded part can adopt a bent anchor form to reduce the longitudinal anchoring depth.
After the embedded steel plate of the column bottom embedded part of the prefabricated upper column is provided with the screw hole, the phenomenon of stress concentration at the edge of the screw hole can be generated, and by the method of installing the nut on the screw hole, the grouting and grout outlet channel of the grouting sleeve can be sealed, the phenomenon of stress concentration at the edge of the screw hole can be reduced, and therefore the stress form of the embedded steel plate of the column bottom embedded part is improved.
The construction method of the assembly type frame beam-column wet joint with the buckling restrained brace specifically comprises the following steps:
s1: prefabricating a lower column, an upper column and a precast beam in a factory according to design requirements;
s2: positioning and installing the prefabricated lower column and the prefabricated beam on a construction site, and fixing the prefabricated lower column and the prefabricated beam by adopting temporary supports; binding column stirrups at the beam column joints, and binding beam top longitudinal steel bars on the inner sides of the horizontal sections at the upper ends of the closed stirrups;
s3: the method comprises the following steps of (1) supporting a formwork, pouring a concrete connector, pouring a concrete cast-in-place layer, and leveling a concrete plane; positioning and mounting the beam-end embedded part, inserting a beam-top anchor bar of the beam-end embedded part into a beam-end groove, placing a beam-top steel plate of the beam-end embedded part on a split heads bar of the beam end, and adjusting the beam-end embedded part until the side edge of the beam-top steel plate is flush with the column edge of the prefabricated upper column; maintaining the concrete connector and the concrete cast-in-place layer;
s4: paving grouting materials above beam column joints, hoisting the prefabricated upper column, inserting the longitudinal ribs of the joint column into grouting sleeves of the prefabricated upper column, performing grouting operation on the grouting sleeves, screwing nuts into screw holes in the embedded steel plates after grouting of the grouting sleeves at the embedded steel plates is completed, and fixing the prefabricated upper column by adopting temporary supports;
s5: respectively welding and connecting the lug plates with the embedded steel plate of the column bottom embedded part and the beam top steel plate of the beam end embedded part, and connecting the lug plates with the BRB in a bolt or welding mode and the like;
s6: and (5) removing the temporary support, removing the template and the like, and performing subsequent construction operation.
Compared with the prior art, the invention has the advantages that:
according to the fabricated frame beam-column wet joint with the buckling restrained brace and the construction method, the frame structure forms a rigid connection frame system through the cast-in-place concrete at the beam-column joint and the beam-end groove. Compared with the hinged frame, the rigid connection frame has obvious advantages in the aspects of static bearing performance, shock resistance and building cost. From the static bearing angle, the frame column of the rigid connection frame has small calculation height, higher vertical bearing capacity and better stability; from the earthquake-proof perspective, the rigid connection frame can improve the energy consumption capability of the structure through the plastic internal force redistribution of the frame beams, and a plurality of earthquake-proof fortification lines of the frame structure are formed; from the perspective of construction cost, the beams and the columns of the hinged frame are generally connected by the steel connecting assembly, the steel connecting assembly bears larger internal force of the beam and column node, particularly the frame with the BRB, and the steel connecting assembly also needs to bear axial force transmitted by the BRB, so that the stress distribution of the steel connecting assembly is more complex, the required material and the installation cost are higher, and when the wet node structure is adopted, the construction cost of the beam and column node can be obviously reduced.
According to the beam-column wet joint structure of the assembly type concrete frame with the BRB installation embedded parts, the screw holes are formed in the embedded steel plates of the column bottom embedded parts and the grooves are formed in the beam ends of the precast beams, so that the construction method of the beam-column joint with the column bottom embedded parts in the prefabrication stage and the beam end embedded parts in the construction stage is established, related processes such as member prefabrication, construction installation and the like are relatively simple, the construction quality of the beam-column joint and the installation quality of the BRB installation embedded parts can be guaranteed, and the popularization and application of the technology are facilitated.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of a BRB mounting insert;
FIG. 3 is a schematic bottom view of a prefabricated upper column;
FIG. 4 is a schematic top view of a prefabricated lower column;
fig. 5 is a schematic view of reinforcement and beam-end embedded part installation of the precast beam.
In the figure: 1-prefabricating a lower column; 1-1-node column longitudinal bar; 2, prefabricating an upper column; 2-1-grouting sleeve; 2-2-key slot; 3-grouting material; 4-a concrete interface; 5-BRB; 6-BRB mounting embedded parts; 7-prefabricating a beam; 7-1-grooves; 7-2-closed stirrup; 7-3-split heads; 7-4-an anchor segment; 7-5-connecting reinforcing ribs; 8-a concrete cast-in-place layer; 9-column bottom embedded parts; 9-1-pre-burying a steel plate; 9-1-1-screw hole; 9-2-anchor bars; 10-beam end embedment; 10-1-beam top steel plate; 10-2-beam top anchor bars; 11-ear plate; 12-node column stirrups; 13-beam top longitudinal steel bars; 14-nut.
Detailed Description
In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings. The drawings are only for the purpose of illustrating the technology of the invention and are not to be construed as representing actual proportions or actual shapes of products, wherein like reference numerals indicate identical or functionally similar elements.
In this context, "parallel", "perpendicular", and the like are not strictly mathematical and/or geometric limitations, but may also include tolerances as would be understood by one skilled in the art and allowed for in the manufacture or use of the product. In addition, "perpendicular" includes not only mutually perpendicular in which two objects are directly connected in space but also mutually perpendicular in which two objects are not connected in space.
As shown in the attached figure 1, the fabricated frame beam-column wet joint with the buckling restrained brace comprises a prefabricated lower column 1, a prefabricated upper column 2, a superposed beam, a concrete connector 4, a BRB5 and a BRB mounting embedded part 6; the superposed beam consists of a precast beam 7 and a concrete cast-in-place layer 8; the column bottom joint of the prefabricated upper column 2 is arranged at the elevation of the floor, and the column bottom joint is tightly filled with grouting material 3; the elevation of the top of the prefabricated lower column 1 is the same as the elevation of the bottom of the composite beam; the prefabricated lower column and the superposed beam are connected through a cast-in-place concrete connector 4, and the concrete connector 4 comprises cast-in-place concrete at the beam column node and the prefabricated beam groove 7-1; the BRB installation embedded part 6 comprises a column bottom embedded part 9, a beam end embedded part 10 and an ear plate 11, wherein the column bottom embedded part 9 is embedded at the column bottom of the prefabricated upper column 2, and the beam end embedded part 10 is embedded at the beam end of the superposed beam.
As shown in fig. 1 and 2, the column bottom embedded part 9 is formed by welding an embedded steel plate 9-1 and an anchor bar 9-2, the embedded steel plate 9-1 of the column bottom embedded part is provided with a screw hole 9-1-1, a nut 14 is screwed on the screw hole 9-1-1, and the screw hole 9-1-1 corresponds to the grouting opening and the grout outlet of the grouting sleeve 2-1; the bottom of the embedded steel plate 9-1 of the column bottom embedded part is flush with the bottom of the prefabricated upper column 2, and the embedded steel plate 9-1 of the column bottom embedded part is flush with the outer surface of the prefabricated upper column 2; the beam-end embedded part 10 is formed by welding a beam-top steel plate 10-1 and a beam-top anchor bar 10-2; the anchor bars 9-2 and the beam top anchor bars 10-2 can adopt a straight anchor or a bent anchor form.
As shown in fig. 1 and 3, a grouting sleeve 2-1 is embedded at the column bottom of the prefabricated upper column 2, and the upper end of the grouting sleeve 2-1 is in threaded connection with the longitudinal ribs of the prefabricated upper column 2; the bottom surface of the prefabricated upper column 2 is provided with a key groove 2-2 and a rough surface, the concave-convex depth of the rough surface is greater than or equal to 6mm, and the area of the rough surface is greater than or equal to 80% of the area of the bottom surface of the prefabricated upper column 2; the depth of the key groove 2-2 is greater than or equal to 30mm, and the width is greater than or equal to 3 times the depth and less than 10 times the depth. The distance from the notch of the key groove 2-2 to the section edge of the prefabricated upper column 2 is more than or equal to 50 mm; the distance between the key grooves 2-2 is equal to the width of the key grooves 2-2; the inclination angle of the inclined plane at the end part of the key groove 2-2 is less than or equal to 30 degrees.
As shown in fig. 1 and 4, a node column longitudinal rib 1-1 extends outwards from the column top of a prefabricated lower column 1, and a node column stirrup 12 is arranged on the outer side of the node column longitudinal rib 1-1; the node column longitudinal bar 1-1 is connected with the grouting sleeve 2-1 through grouting; the column top surface of the prefabricated lower column 1 is provided with a rough surface, the area of the rough surface is not suitable to be less than 80% of the area of the column top surface, and the concave-convex depth of the rough surface is not less than 6 mm.
As shown in fig. 1 and 5, the beam top of the precast beam 7 extends out of the closed type stirrup 7-2, the beam top longitudinal steel bar 13 is bound on the inner side of the upper end of the closed type stirrup 7-2, and the beam top longitudinal steel bar 13 penetrates through a beam-column joint; the beam end of the precast beam 7 extends out of the anchoring section 7-4 of the beam bottom longitudinal rib, and the anchoring section 7-4 of the beam bottom longitudinal rib can adopt a bent anchor or straight anchor form as required; prefabricating a groove 7-1 at the beam end of the precast beam 7, wherein the wall thicknesses of two sides of the groove 7-1 are the same, and the wall thickness of one side is greater than or equal to 1/6 of the width of the precast beam 7; the sum of the groove depth of the groove 7-1 and the thickness of the concrete cast-in-place layer 8 is larger than the sum of the vertical projection length of the beam top anchor bar 10-2 and the thickness of the beam top steel plate 10-1; the thickness of the concrete from the groove bottom of the groove 7-1 to the beam bottom of the precast beam 7 needs to meet the thickness requirement of a concrete protective layer required by a beam bottom longitudinal bar, and is not less than 1/4 of the section height of the precast beam 7; the top surfaces of two sides of the groove 7-1 are respectively provided withBurying 7-3 split heads of 2 split heads; two sides of the groove 7-1 are embedded with connecting reinforcing ribs 7-5, and the connecting reinforcing ribs 7-5 areShaping; a rough surface is arranged on a joint surface between the precast beam 7 and the concrete cast-in-place layer 8; the end face of the precast beam 7 and the inner side face and the bottom face of the groove 7-1 are both provided with rough faces, and the area of each rough face is greater than or equal to 80% of the area of the surface where the rough face is located; the beam end embedded part 10 adopts a field embedding mode, after the concrete connector 4 is poured, a beam top anchor bar 10-2 is inserted into a beam end groove 7-1, a beam top steel plate 10-1 of the beam end embedded part is placed on a beam end split heads 7-4, and the side edge of the beam top steel plate 10-1 of the beam end embedded part is flush with the column edge of the prefabricated upper column 2.
A construction method of an assembly type frame beam-column wet joint with buckling restrained braces specifically comprises the following steps:
(1) according to design requirements, relevant components including a prefabricated lower column 1, a prefabricated upper column 2 and a prefabricated beam 7 are prefabricated in a factory. The longitudinal ribs of the prefabricated upper column 2 are in threaded connection with the grouting sleeve 2-1, and a column bottom embedded part 9 of the prefabricated upper column 2 is embedded at the column bottom; prefabricating column longitudinal ribs 1-1 of column tops of the lower columns 1; the beam end of the precast beam 7 is precast into a groove section, 2 split heads 7-4 are respectively embedded on the top surfaces of two sides of the groove 7-1, and reinforcing ribs 7-5 are embedded and connected on two sides of the groove 7-1; the beam top of the precast beam 7 extends outwards to form a closed stirrup 7-1, and the beam end of the precast beam 7 extends outwards to form a longitudinal bar anchoring section 7-2.
(2) Positioning and installing the prefabricated lower column 1 and the prefabricated beam 7 on a construction site, and fixing the prefabricated lower column 1 and the prefabricated beam 7 by adopting temporary support; binding a column stirrup 1-1 at a beam column joint, binding a beam top longitudinal steel bar 13 on the inner side of the upper end horizontal section of the closed stirrup 7-1:
(3) erecting a formwork, pouring a concrete connector 4, pouring a concrete cast-in-place layer 8, and leveling a concrete plane; positioning and mounting a beam end embedded part 10, inserting an anchor bar 10-2 of the beam end embedded part 10 into a beam end groove 7-1, placing an embedded steel plate 10-1 of the beam end embedded part on a split heads bar 7-4 of a beam end, and adjusting the side edge of the embedded steel plate 10-1 of the beam end embedded part to be flush with the column edge of the prefabricated upper column 2; maintaining the concrete connector 4 and the concrete cast-in-place layer 8;
(4) paving grouting materials 3 above beam-column joints, hoisting the prefabricated upper column 2, inserting the joint column longitudinal ribs 1-1 into grouting sleeves 2-1 of the prefabricated upper column 2, performing grouting operation on the grouting sleeves 2-1, screwing nuts 14 into screw holes 9-1-1 after grouting of the grouting sleeves 2-1 at the positions of pre-buried steel plates 9-1 is completed, and fixing the prefabricated upper column 2 by adopting temporary support;
(5) the ear plate 11 is respectively welded with the embedded steel plate 9-1 of the column bottom embedded part and the embedded steel plate 10-1 of the beam end embedded part, and the ear plate 11 is connected with the BRB in a bolt or welding mode and the like;
(6) and (5) removing the temporary support, removing the template and the like, and performing subsequent construction operation.
It should be understood that although the present description has been described in terms of various embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and those skilled in the art will recognize that the embodiments described herein may be combined as suitable to form other embodiments, as will be appreciated by those skilled in the art.
The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.

Claims (4)

1. The utility model provides a take assembled frame beam column wet node of bucking restraint support which characterized in that: the prefabricated beam comprises a prefabricated lower column (1), a prefabricated upper column (2), a superposed beam and a BRB mounting embedded part (6), wherein the prefabricated lower column (1) is connected with the superposed beam through a cast-in-place concrete connector (4); the column bottom joint of the prefabricated upper column (2) is arranged at the elevation of the floor, and is filled with grouting material (3); the elevation of the top of the prefabricated lower column (1) is the same as the elevation of the bottom of the superposed beam; the composite beam comprises a precast beam (7) and a concrete cast-in-place layer (8) at the top of the precast beam (7), and a precast groove (7-1) is formed in the beam end of the precast beam (7); the concrete connector (4) comprises cast-in-place concrete at a beam-column joint and cast-in-place concrete at a groove (7-1) of the precast beam (7); the BRB mounting embedded part comprises a column bottom embedded part (9), a beam end embedded part (10) and an ear plate (11), the column bottom embedded part (9) is embedded at the column bottom of the prefabricated upper column (2), the beam end embedded part (10) is embedded at the beam end of the superposed beam, and the ear plate (11) is connected with the column bottom embedded part (9) and the beam end embedded part (10);
a grouting sleeve (2-1) is embedded at the column bottom of the prefabricated upper column (2), and the upper end of the grouting sleeve (2-1) is mechanically connected with the longitudinal rib of the prefabricated upper column (2); the column bottom embedded part (9) is formed by welding an embedded steel plate (9-1) and an anchor bar (9-2), a screw hole (9-1-1) is formed in the embedded steel plate (9-1), a nut (14) is screwed on the screw hole (9-1-1), and the screw hole (9-1-1) corresponds to the grouting opening and the grout outlet of the grouting sleeve (2-1);
a node column longitudinal rib (1-1) extends outwards from the column top of the prefabricated lower column (1), and a node column stirrup (12) is arranged on the outer side of the node column longitudinal rib (1-1); the node column longitudinal bar (1-1) is connected with the grouting sleeve (2-1) in a grouting manner;
the beam top of the precast beam (7) extends out of a closed type hoop (7-2), the inner side of the upper end of the closed type hoop (7-2) is bound with a beam top longitudinal steel bar (13), the beam top longitudinal steel bar (13) penetrates through a beam-column joint, and the beam end of the precast beam (7) extends out of an anchoring section (7-4) of a beam bottom longitudinal steel bar; the top surfaces of the two sides of the groove (7-1) are both pre-embedded with a split heads rib (7-3); the beam end embedded part (10) is formed by welding a beam top steel plate (10-1) and a beam top anchor bar (10-2), the beam top steel plate (10-1) is placed on the split heads (7-3), and the beam top anchor bar (10-2) extends into a groove (7-1) of the precast beam (7);
the wall thicknesses of two sides of the groove (7-1) are the same, and the wall thickness of one side is greater than or equal to 1/6 of the width of the precast beam (7); the sum of the depth of the groove (7-1) and the thickness of the concrete cast-in-place layer (8) is greater than the sum of the vertical projection length of the beam top anchor bar (10-2) and the thickness of the beam top steel plate (10-1); the thickness of the concrete from the groove bottom of the groove (7-1) to the beam bottom of the precast beam (7) meets the requirement of the thickness of a concrete protective layer required by the longitudinal bar at the beam bottom, and is greater than or equal to 1/4 of the section height of the precast beam (7); 2 split heads (7-3) are embedded in the top surfaces of the two sides of the groove (7-1) respectively;
reinforcing ribs (7-5) are embedded at two sides of the groove (7-1), and the reinforcing ribs (7-5) are shaped like the inductor which acts as the inductor and the inductor; a rough surface is arranged on a joint surface between the precast beam (7) and the concrete cast-in-place layer (8), rough surfaces are arranged on the end surface of the precast beam (7) and the inner side surface and the bottom surface of the groove (7-1), and the area of the rough surface is greater than or equal to 80% of the total area of the surface where the rough surface is located; the side edge of a beam top steel plate (10-1) of the beam end embedded part is flush with the column edge of the prefabricated upper column (2).
2. The fabricated frame beam-column wet joint with buckling restrained brace of claim 1, wherein: the bottom surface of the prefabricated upper column (2) is provided with a key groove (2-2) and a rough surface, the concave-convex depth of the rough surface is greater than or equal to 6mm, and the area of the rough surface is greater than or equal to 80% of the area of the bottom surface of the prefabricated upper column (2); the depth of the key groove (2-2) is greater than or equal to 30mm, and the width is greater than or equal to 3 times of the depth and less than 10 times of the depth; the distance from the notch of the key groove (2-2) to the section edge of the prefabricated upper column (2) is more than or equal to 50 mm; the distance between the key grooves (2-2) is equal to the width of the key grooves (2-2); the inclined angle of the end part of the key groove (2-2) is less than or equal to 30 degrees.
3. The fabricated frame beam-column wet joint with buckling restrained brace of claim 1, wherein: the column top surface of the prefabricated lower column (1) is provided with a rough surface, the area of the rough surface is greater than or equal to 80% of the area of the column top surface, and the concave-convex depth of the rough surface is greater than or equal to 6 mm.
4. A construction method of a fabricated frame beam-column wet joint with buckling restrained brace according to any one of claims 1 to 3, characterized by comprising the following steps:
s1: prefabricating a lower column (1), an upper column (2) and a precast beam (7) in a factory according to design requirements;
s2: positioning and installing the prefabricated lower column (1) and the prefabricated beam (7) on a construction site, and fixing the prefabricated lower column (1) and the prefabricated beam (7) by adopting temporary supports; binding column stirrups (12) at the joints of the beams and the columns, and binding beam top longitudinal reinforcements (13) on the inner sides of the horizontal sections at the upper ends of the closed stirrups (7-2);
s3: the method comprises the following steps of (1) supporting a formwork, pouring a concrete connector (4), pouring a concrete cast-in-place layer (8), and leveling a concrete plane; positioning and mounting a beam-end embedded part (10), inserting a beam-top anchor bar (10-2) of the beam-end embedded part (10) into a beam-end groove (7-1), placing a beam-top steel plate (10-1) of the beam-end embedded part on a beam-end split heads bar (7-3), and adjusting the beam-end embedded part until the side edge of the beam-top steel plate (10-1) is flush with the column edge of the prefabricated upper column (2); maintaining the concrete connector (4) and the concrete cast-in-place layer (8);
s4: paving grouting materials (3) above beam-column joints, hoisting the prefabricated upper column (2), inserting the joint column longitudinal ribs (1-1) into grouting sleeves (2-1) of the prefabricated upper column (2), performing grouting operation on the grouting sleeves (2-1), screwing nuts (14) into screw holes (9-1-1) on the embedded steel plates (9-1) after grouting of the grouting sleeves (2-1) at the embedded steel plates (9-1) is completed, and fixing the prefabricated upper column (2) by adopting temporary supports;
s5: respectively welding and connecting the ear plate (11) with an embedded steel plate (9-1) of the column bottom embedded part and a beam top steel plate (10-1) of the beam end embedded part, wherein the ear plate (11) is connected with the BRB in a bolt or welding mode;
s6: and (5) removing the temporary support, removing the template and performing subsequent construction operation.
CN202010677597.9A 2020-07-15 2020-07-15 Fabricated frame beam-column wet joint with buckling restrained brace and construction method Active CN111877546B (en)

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CN112554336A (en) * 2020-12-03 2021-03-26 太原理工大学 Take BRB installation to bury assembled frame beam column rigid node of piece

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CN110056087A (en) * 2019-06-03 2019-07-26 福州大学 SMA-ECC self-healing assembling frame node structure and construction method

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CN108661171A (en) * 2018-07-03 2018-10-16 江苏南通二建集团有限公司 A kind of prefabricated assembled concrete frame joint connection structure
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