AU2020100507A4 - Prefabricated Concrete Frame Beam-Column Connection Joint With Steel Strands Anchored - Google Patents

Prefabricated Concrete Frame Beam-Column Connection Joint With Steel Strands Anchored Download PDF

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Publication number
AU2020100507A4
AU2020100507A4 AU2020100507A AU2020100507A AU2020100507A4 AU 2020100507 A4 AU2020100507 A4 AU 2020100507A4 AU 2020100507 A AU2020100507 A AU 2020100507A AU 2020100507 A AU2020100507 A AU 2020100507A AU 2020100507 A4 AU2020100507 A4 AU 2020100507A4
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Prior art keywords
column
joint
concrete
precast
steel
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AU2020100507A
Inventor
Jiangang WEI
Wei Zhang
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Fujian University of Technology
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Fujian University of Technology
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Classifications

    • 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
    • E04B1/38Connections for building structures in general
    • E04B1/40Separate connecting elements
    • E04B1/48Dowels, i.e. members adapted to penetrate the surfaces of two parts and to take the shear stresses
    • E04B1/483Shear dowels to be embedded in concrete
    • 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
    • E04B1/185Connections not covered by E04B1/21 and E04B1/2403, e.g. connections between structural parts of different material
    • 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
    • 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
    • E04B1/22Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of concrete, e.g. reinforced concrete, or other stonelike material with parts being prestressed
    • 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
    • E04B1/38Connections for building structures in general
    • E04B1/58Connections for building structures in general of bar-shaped building elements
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04CSTRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00Structural elongated elements designed for load-supporting
    • E04C3/02Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/29Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces built-up from parts of different material, i.e. composite structures
    • E04C3/293Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces built-up from parts of different material, i.e. composite structures the materials being steel and concrete
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04CSTRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00Structural elongated elements designed for load-supporting
    • E04C3/02Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/20Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of concrete or other stone-like material, e.g. with reinforcements or tensioning members
    • E04C3/26Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of concrete or other stone-like material, e.g. with reinforcements or tensioning members prestressed

Abstract

A prefabricated concrete frame beam-column connection joint. A pre tensioned prestressed concrete beam (2) comprising a U-shaped groove (3) at the beam end, prestressed steel strands (4) at the bottom of the beam protrude out of the beam end from the groove for a certain length, and the head of the steel strand is made into an embossed anchor. The end of the precast beam (2) is placed on a concrete protective layer at the side of the precast concrete column (1), the prestressed steel strand is anchored into the column or the U-shaped groove of the opposite precast beam, bolt anchor head short steel bars are placed in the core area of the joint, ordinary steel bars are installed at top of the beam, and the joint is poured with concrete on site to form the integrally prefabricated beam-column connection joint. Fig.1 Fig. 2

Description

Description
Prefabricated concrete frame beam-column connection joint with steel strands anchored
Technical Field
The invention relates to a prefabricated concrete frame beam-column connection joint with steel strands anchored, and belongs to the technical field of concrete frame structures in construction engineering.
Background Art
In order to meet the requirement of the anti-seismic performance for the fabricated concrete frame structure, the connection reliability between a precast column and a precast beam is generally solved by using relevant structures. The currently known connection structures comprise: a connection joint in which the end of the beam is provided with a groove, steel strands at the beam bottom is subjected to hook treatment in the groove, the groove and the joint area are additionally provided with U-shaped steel bars connecting to the hooked steel strands by lapping and the joint is poured with concrete on site; or a connection structure in which the beam end is provided with a step-shaped bracket for placement, ordinary steel bars with a hook protruding from the end of the beam bottom for a certain length are inserted into the beam-column joint area, and the joint is poured with concrete on site; or a prefabricated joint in which connecting steel members are arranged at the side of the column and the end of the beam, and the beam steel members and the column steel members are connected together by bolts.
According to the above well-known connection structures, for the structure wherein the groove is arranged at the beam end and the steel strands in the groove are hooked, and the U-shaped steel bars are additionally provided which are connected with the steel strands by lapping, the positioning of the U-shaped steel bar in field construction is difficult, and the capability of force transmission of the lapping connection between the U-shaped steel bars and the steel strands in the groove at the beam end is poor, causing the ductility of the joint relatively small; for the structure wherein the head of the steel bar stretching from the lower portion of the beam end for a certain length is hooked and directly anchored into the joint area, there often exists a mutual collision problem of steel bars between beams and beams or between beams and columns when steel bars at the beam bottom entering into the joint area in different directions, increasing the difficulty of prefabrication and installation; the beam-column connection by steel member bolts has a high
2020100507 02 Apr 2020 requirement on the alignment accuracy and has shown a low economical indicator and a poor corrosion resistance, and the like, thereby limiting its popularization and application.
In combination with the problems existing in the well-known precast beam-column connection structures above, the invention provides a prefabricated concrete frame beam-column connection joint, which adopts improvement in the related structure to ensure that the steel strands at the beam bottom are directly anchored into the beam-column joint area, and the groove is left at the end of the beam, such that the shear resistance of the beam-column joint surface can be improved, and which also fully utilizes the flexibility of the steel strands in a U-shaped groove at the bottom end of a prestressed concrete beam, such that the steel strands can be bent to be directly anchored into the joint area by avoiding column ribs and beam ribs, thus the ductility of the prefabricated frame joint is improved, a structure with strong columns and weak beams can be realized, construction is simplified, manufacturing cost is reduced, and the prefabricated frame joint can be directly applied to engineering practice.
Summary of the Invention
The invention aims to provide a prefabricated concrete frame beam-column connection joint with steel strands anchored, in which the approach that a pre-tensioned prestressed concrete beam is provided with a U-shaped groove at the beam end is maintained, but the way to handle the prestressed steel strand in the groove at the bottom of the beam end is changed by protruding the steel strand for a certain length from the end-face of the beam and anchoring it into the joint area, with the head of the steel strand being made into an embossed anchor for improving the anchor performance. In order to provide ductility, bolt anchor head steel bars are arranged in the joint area, so that the plastic hinge of the frame structure appears on the beam at a certain distance from the column side. The beam-column joint is still poured with concrete to form an integrally prefabricated joint.
The technical scheme adopted by the invention is to provide a prefabricated concrete frame beam-column connection joint, which is characterized in that: it comprises a precast column, a precast pre-tensioned prestressed concrete beam with a U-shaped groove at the end, prestressed steel strands in the groove at the beam end which stretch out of the end-face of the beam for a certain length with the head being an embossed anchor, ordinary steel bars on the beam top in the joint area, bolt anchor head steel bars, beam stirrups and the like. The precast pre-tensioned prestressed concrete beam is placed on a protective layer of the precast concrete column concrete, the prestressed steel strands in the U-shaped groove at the beam end is bent properly due to its
2020100507 02 Apr 2020 flexibility to avoid the column rib so as to be anchored into the joint area, and even be inserted it into the U-shaped groove of the opposite precast beam for anchoring; and the commonly arranged ordinary steel bars on the beam top are post-inserted, bolt anchor head steel bars are placed in the grooves of the beams on both sides of the column in the joint area, the joint is integrally poured with concrete, and thus a prefabricated strong connection joint is formed.
According to the invention which fully utilizes the flexibility of the steel strand and the arrangement of the groove with a certain length at the beam end, in the hoisting process of the precast beam, the prestressed steel strand in the groove at the beam end can be bent upwards so as not to protrude out of the beam end, thereby avoiding colliding with vertical steel bars of the precast column, and facilitating hoisting in place; in the process of hoisting the precast beam in place, the prestressed steel strand at the bottom of the beam can be freely bent based on the position of the prestressed steel strand at the bottom of the beam in different directions on site, and anchored into the joint area without touching any column ribs, and the construction problem that the stressed main ribs protruding from the end of the beam bottom easily collide with the column ribs is thoroughly solved.
According to the invention, the arrangement of the U-shaped groove can be determined comprehensively by fully considering of various factors, such as the anchoring requirement of the prestressed steel strand, the stress requirement of temporary laying of the beam, the shearing resistance requirement of a beam column joint surface, the bending convenience of the prestressed steel strand and the like.
Bolt anchor head short steel bars are placed in the U-shaped grooves at the end of the precast beam on both sides of the precast concrete column and in the core area of the section width of the column, thereby improving the crack resistance of the lower part of the splicing surface of the beam-column, and facilitating a plastic hinge of the fabricated frame appearing on the beam at a certain distance from the column.
Wherein the precast pre-tensioned prestressed concrete beam stirrups are made dense in the length range of the U-shaped groove at the end of the beam, so that the plastic hinge at the end of the beam appears within a certain distance from the column side.
After the beam-column connection joint is assembled, ordinary steel bars at the upper part of the beam-column connection joint area are bound, and the joint is poured with concrete on site to
2020100507 02 Apr 2020 form the integrally prefabricated joint.
Advantageous Effects: (1) according to the invention, by adopting the precast pre-tensioned prestressed concrete beam , the steel consumption of the beam can be reduced or the cross section of the beam can be reduced, thereby achieving the goal of saving materials and reducing the manufacturing cost; and (2) by arranging a U-shaped groove with a certain length at the end of the precast beam and integrally pouring concrete in the groove and the joint, the shear resistance of the beam-column joint surface can be improved, and the anchoring length of the prestressed steel strand at the bottom of the beam can be increased. In addition, due to the arrangement of the groove, the length of the free bending section of the prestressed steel strand can be increased, it is more convenient to utilize the flexibility of the prestress steel strand to perform space staggered bending, and the construction problem that steel bars at the bottom of the beam in different directions are easily to collide with column ribs when the precast beam is in place is thoroughly solved; (3) due to the fact that one end of the head of the prestressed steel strand with the embossed anchor enters into the joint area and is even inserted into the U-shaped groove of the opposite prefabricated beam to be fully anchored, the steel bars at top of the beam are continuous, the joint concrete is integrally poured, a strong connection joint can be formed, thereby fully exerting the anti-seismic performance of the beam and the column, and improving the anti-seismic performance of the integral structure; and (4) since the prestressed steel strands protruding out of the end of the precast beam can be bent upwards in the groove, the precast beam can be prevented from being collided with the vertical steel bars of the precast column in the hoisting process, thereby facilitating hoisting in place.
Brief Description of the Drawings
Fig. 1 is three-dimensional schematic diagram of a prefabricated frame beam-column connection joint of the invention;
Fig. 2 is a three-dimensional schematic diagram of steel strand bending during hoisting of a precast pretensioned prestressed concrete beam;
Fig. 3 is a three-dimensional schematic diagram of bolt anchor head short steel bar;
Fig. 4 is a three-dimensional schematic diagram of precast pre-tensioned prestressed concrete beam.
2020100507 02 Apr 2020
Detailed Description of the Invention
The present invention is further illustrated with reference to the accompanying drawings:
As shown in Figure 1: a prefabricated frame beam-column connection joint, after a precast concrete column (1) provided with column vertical steel bars is installed in place, a precast pre-tensioned prestressed concrete beam (2) provided with a groove (3), prestressed steel strands (4) protruding out of the bottom end of the beam and beam stirrups is hoisted and temporarily placed on the concrete protective layer of the precast concrete column (1), and according to the actual position of vertical steel bars of the field column, the prestressed steel strands (4) at the beam bottom are manually bent to form a staggered arrangement and enter into the joint area and are even inserted into the U-shaped grooves (3) of the opposite precast beam to be fully anchored, then bolt anchor head short steel bars (8) are placed in the U-shaped grooves on both sides of the joint and the core area of the joint, beam top ordinary steel bars (7) are inserted into beam stirrups and are bound and fixed, and finally the joint area is poured with concrete on site, thus forming an integrally prefabricated beam-column connecting connection joint.
As shown in Figure 2: in the hoisting process of the precast pretensioned prestressed concrete beam (2), the prestressed steel strand (4) at the bottom end of the beam is bent in the groove (3) to prevent from colliding with vertical steel bars of the precast column, thus facilitating the hoisting operation. One end of the prestressed steel strand is made into an embossed anchor (9), so that the prestressed steel strand (4) can be reliably anchored into the joint area.
As shown in Figure 3: by arranging the bolt anchor head short steel bars (8) in the U-shaped grooves (3) on both sides of the joint and the core area of the joint, the strength of the precast beam-column joint surface at the joint area can be further enhanced, and the plastic hinge at the beam end can appear at a preset position.
As shown in Figure 4:Wherein the precast pre-tensioned prestressed concrete beam stirrups are made dense in the length range of the U-shaped groove at the end of the beam, so that the plastic hinge at the end of the beam appears within a certain distance from the column side.
After the beam-column connection joint is assembled, ordinary steel bars at the upper part of the beam-column connection joint area are bound, and the joint is poured with concrete on site to form the integrally prefabricated joint
2020100507 02 Apr 2020
The particular construction method of the prefabricated concrete frame beam-column connection joint is described in detail as follows: the concrete column is laminated prefabricated, the pre-tensioned prestressed concrete beam is prefabricated in sections according to the span, the prefabricated beam is placed on the concrete protective layer of the precast column during installation, the prestressed steel strands protruding out of the inner end of the beam enter into the column for anchoring, then bolt anchor head steel bars are placed in the joint area, the top of the beam is inserted with ordinary steel bars, and the joint poured with concrete on site. An integrally prefabricated connection joint is formed.
It should be noted that several modifications and variations may be made by those skilled in the art without departing from the spirit of the application, wherein these modifications and variations are to be considered within the scope of this application. Each undefined components of this embodiment may be implemented according the prior art.

Claims (5)

  1. Claims
    1. A prefabricated concrete frame beam-column connection joint with steel strands anchored, characterized in that: it comprises a precast concrete column, a pre-tensioned prestressed concrete beam provided with a U-shaped groove at a beam end, prestressed steel strands with embossed anchors protruding out of the beam end from the groove, ordinary steel bars at top of the beam, bolt anchor head steel bars, beam stirrups and the like; the precast pre-tensioned prestressed concrete beam is placed on a concrete protective layer of the precast concrete column, the prestressed steel strands protrude out of the beam end for a certain length and are inserted into the joint area or the U-shaped groove of the opposite precast beam for anchoring, and bolt anchor head short steel bars are placed in the U-shaped grooves on both sides of the joint and the core area of the joint; the ordinary steel bars are installed at top of the beam, and the joint is poured with concrete on site to form the integrally prefabricated connection joint.
  2. 2. The prefabricated concrete frame beam-column connection joint with steel strands anchored accordingto claim 1, characterized in that: the U-shaped groove with a certain length is left at the end of the precast pre-tensioned prestressed concrete beam, the prestressed steel strands at the bottom of the beam end protrude from above the bottom plate of the groove and out of the beam end for a certain length, the end of the steel strand is made into an embossing anchor, the prestressed steel strand at the end of the beam can be flexibly bent from the starting point of the U-shaped groove by utilizing the flexibility of the prestress steel strand, and anchored into the joint area by easily avoiding the column ribs during the joint installation, facilitating the precast of the beam and the installation of the joint on site.
  3. 3. The prefabricated concrete frame beam-column connection joint with steel strands anchored according to claim 1, characterized in that: bolt anchor head short steel bars are placed in the U-shaped grooves at the end of the precast beam on both sides of the precast concrete column and in the core area of the section width of the column, thereby improving the crack resistance of the lower part of the splicing surface of the beam-column, and facilitating a plastic hinge of the fabricated frame appearing on the beam at a certain distance from the column.
  4. 4. The prefabricated concrete frame beam-column connection joint with steel strands anchored according to claim 1, wherein the precast pre-tensioned prestressed concrete beam stirrups are made dense in the length range of the U-shaped groove at the end of the beam, so that the plastic hinge at the end of the beam appears within a certain distance from the column side.
    2020100507 02 Apr 2020
  5. 5. The prefabricated concrete frame beam-column connection joint with steel strands anchored according to claim 1, characterized in that: after the beam-column connection joint is assembled, ordinary steel bars at the upper part of the beam-column connection joint area are bound, and the joint is poured with concrete on site to form the integrally prefabricated joint.
AU2020100507A 2020-04-02 2020-04-02 Prefabricated Concrete Frame Beam-Column Connection Joint With Steel Strands Anchored Active AU2020100507A4 (en)

Priority Applications (1)

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AU2020100507A AU2020100507A4 (en) 2020-04-02 2020-04-02 Prefabricated Concrete Frame Beam-Column Connection Joint With Steel Strands Anchored

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AU2020100507A AU2020100507A4 (en) 2020-04-02 2020-04-02 Prefabricated Concrete Frame Beam-Column Connection Joint With Steel Strands Anchored

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112431305A (en) * 2020-10-30 2021-03-02 中民筑友房屋科技(石首)有限公司 Assembly type building frame and quick connection method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112431305A (en) * 2020-10-30 2021-03-02 中民筑友房屋科技(石首)有限公司 Assembly type building frame and quick connection method thereof

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