CN115354745A - Assembled pretensioning method prestressed beam column connected node - Google Patents
Assembled pretensioning method prestressed beam column connected node Download PDFInfo
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- CN115354745A CN115354745A CN202211039600.XA CN202211039600A CN115354745A CN 115354745 A CN115354745 A CN 115354745A CN 202211039600 A CN202211039600 A CN 202211039600A CN 115354745 A CN115354745 A CN 115354745A
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- column
- steel strand
- node
- cap
- concrete frame
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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
- E04B1/20—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of concrete, e.g. reinforced concrete, or other stonelike material
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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
- E04B1/20—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of concrete, e.g. reinforced concrete, or other stonelike material
- E04B1/21—Connections specially adapted therefor
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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
- E04B1/20—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of concrete, e.g. reinforced concrete, or other stonelike material
- E04B1/22—Structures 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
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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
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/92—Protection against other undesired influences or dangers
- E04B1/98—Protection against other undesired influences or dangers against vibrations or shocks; against mechanical destruction, e.g. by air-raids
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/20—Joists; 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
- E04C3/26—Joists; 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
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/30—Columns; Pillars; Struts
- E04C3/34—Columns; Pillars; Struts of concrete other stone-like material, with or without permanent form elements, with or without internal or external reinforcement, e.g. metal coverings
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/08—Members specially adapted to be used in prestressed constructions
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/08—Members specially adapted to be used in prestressed constructions
- E04C5/12—Anchoring devices
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Environmental & Geological Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Joining Of Building Structures In Genera (AREA)
Abstract
The embodiment of the application provides an assembled pre-tensioning method prestressed beam column connecting node, which comprises a concrete frame column and a pre-tensioning method prestressed superposed beam; the top of the concrete frame column is provided with a column cap, and the superposed beam is directly placed on the column cap, so that a superposed beam support frame is omitted; the column caps can provide safe storage for the vertical joints of the beam end nodes to resist shearing in the construction stage, and can be integrally cast with the superposed beam ends to form enlarged nodes in the use stage, so that the seismic performance of the nodes is enhanced; the steel strand extending out of the end part of the composite beam is directly bent and anchored in the connecting node, in the construction stage, the pre-tensioning method prestressed composite beam is directly placed on the column cap to form a simply supported model, the high-strength steel strand at the bottom of the beam is fully utilized to bear the bending moment generated by the dead weight in the construction stage, and the negative bar of the support is reduced; the steel strand wires can easily dodge node reinforcing bars, and construction convenience when guaranteeing node construction quality, can also reduce the construction degree of difficulty, reduces the cost.
Description
Technical Field
The invention relates to the field of assembled building structures, in particular to an assembled pre-tensioning method pre-stressed beam-column connecting node.
Background
The core of the precast concrete assembled integral frame structure is the node connection structural form of the precast concrete beam and the concrete column, and the quality of the precast concrete assembled integral frame structure directly influences the ultimate bearing capacity, the seismic performance and the like of the structure. The existing common beam-column joint connecting technology of the prefabricated frame structure is mainly characterized in that a key slot or a U-shaped groove is formed in the end part of a superposed beam, a prestressed rib and a common steel bar are matched at the bottom of the beam, a U-shaped rib is arranged in a joint core area and connected with a beam end steel bar, and a post-cast section of the joint area adopts a concrete cast-in-place structure to integrate the superposed beam and the column; or the high-strength steel bars are adopted at the beam bottom to directly extend into the core area of the node, the vertical steel bars are placed in the core area of the node, and then the node is integrally cast in place. However, in the joint connection structure, the superposed beams all need to be independently erected with supporting frames, so that the manufacturing cost is high, the collision of joint reinforcing steel bars is difficult to avoid, the formwork is complex, the construction operation is inconvenient, and the ductility of the joint is deficient.
Therefore, there is a need to develop an assembled pre-tensioned prestressed beam-column connection node to solve the above-mentioned problems.
Disclosure of Invention
The embodiment of the invention provides an assembled pretensioning method prestressed beam-column connecting node, which aims to solve the technical problems that in the prior art, a support frame needs to be independently erected for a superposed beam, collision of node steel bars is difficult to avoid, a formwork is complex, construction operation is inconvenient, and node ductility is poor.
The embodiment of the invention provides an assembled pre-tensioned pre-stressed beam column connecting node, which comprises:
a concrete frame column, the top of which is provided with a column cap which extends outwards and expands, an
The pre-tensioning method prestressed composite beam is characterized in that the end part of the pre-tensioning method prestressed composite beam is placed on the column cap, and concrete is poured between the pre-tensioning method prestressed composite beam and the column cap to form a connecting node;
the end part of the pre-tensioning method prestress superposed beam is provided with a steel strand extending out of the interior of the pre-tensioning method prestress superposed beam, and the steel strand extends into the connecting node and is bent upwards to be anchored in the connecting node.
Optionally, the steel strands extend into a core region of the connection node and at least beyond a centre line of the concrete frame column.
Optionally, the distance between the bending section of the steel strand and the center line of the concrete frame column is not less than 100mm, and the bending height of the bending section of the steel strand is not less than 300mm.
Optionally, the steel strand is provided with multiple layers, and a PVC sleeve is sleeved on part of the steel strand.
Optionally, under the condition of small earthquake, the strength of the steel strand is 360N/m 2 Designing; under the condition of heavy earthquake, the strength of the steel strand is 1570N/m 2 。
Optionally, the column cap and the concrete frame column are integrally cast, and a reinforcing rib is embedded in the column cap.
Optionally, the outer edge of the cap is flared 200-300mm relative to the column body of the concrete frame column.
The embodiment of the invention has the following beneficial effects:
1. the top of the concrete frame column is provided with a column cap which extends outwards and expands, and the superposed beam can be directly placed on the column cap in the construction stage, so that a superposed beam support frame is omitted; and the column caps can provide safe storage for the vertical joints of the beam end nodes to resist shearing in the construction stage, and can be integrally cast with the superposed beam ends to form enlarged nodes in the use stage, so that the seismic performance of the nodes is enhanced.
2. Adopting a pre-tensioning method to pre-stress the superposed beam, and directly bending and anchoring the steel stranded wire extending out of the end part of the superposed beam in the connecting node instead of a common steel bar; in the construction stage, the pre-tensioning method prestressed composite beam is directly placed on the column cap to form a simply supported model, and the high-strength steel strand at the bottom of the beam is fully utilized to bear the bending moment generated by the dead weight in the construction stage, so that the negative bars of the support are reduced; and the steel strand wires can easily avoid the node reinforcing steel bars, the construction is convenient, the construction quality of the node is ensured, the construction difficulty can be reduced, and the manufacturing cost is reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a top view of an embodiment of the present invention;
FIG. 3 is a partial cross-sectional view of a pretensioned prestressed composite beam in an embodiment of the present invention;
FIG. 4 is a schematic view of a casting configuration according to an embodiment of the present invention;
the figures in the drawings represent:
1. a concrete frame column; 2. pre-tensioning a prestressed composite beam; 3. a cap; 4. steel strand wires; 5. a column main rib; 6. PVC sleeve.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. Furthermore, it should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, and are not intended to limit the present invention.
Referring to fig. 1 and 2, an embodiment of the present invention provides an assembled pre-tensioned prestressed beam-column connection node, which includes a concrete frame column 1 and a pre-tensioned prestressed composite beam 2. Wherein, the top of concrete frame post 1 is equipped with the cap 3 that expands of extending outward, and the tip of pretension method prestressing force superposed beam 2 is shelved on cap 3. As shown in fig. 4, a joint can be formed between the pre-tensioned prestressed composite girder 2 and the cap 3 by casting concrete, and in particular, the laminated layer on the upper part of the pre-tensioned prestressed composite girder 2 is cast together with the floor slab and the joint to enhance the integrity.
The end part of the pre-tensioning method prestressed composite beam 2 is provided with a steel strand 4 extending out of the interior of the beam, and in the embodiment, the steel strand 4 directly extends into the connecting node and is bent upwards to be anchored in the connecting node. The pre-tensioning method prestress composite beam 2 adopts a two-stage stress mode, is directly placed on the column cap 3 to form a simply supported model in a construction stage, and fully utilizes the beam bottom high-strength steel strand 4 to bear bending moment generated by self weight in the construction stage, thereby reducing support negative bars. When shelving, the steel strand wires 4 can be properly bent, so that the column main reinforcements 5 of the concrete frame column 1 and other interfered steel strand wires 4 are avoided, the construction is convenient, the construction difficulty can be reduced while the construction quality of the nodes is ensured, and the construction cost is reduced.
Further, in order to ensure the anchoring effect, the steel strands 4 need to extend into the core area of the connection node and at least beyond the centre line of the concrete frame column 1. The distance between the bending section of the steel strand 4 and the center line of the concrete frame column 1 is preferably not less than 100mm (i.e. L1 in fig. 1 and 2 is not less than 100 mm), and the bending height of the bending section of the steel strand 4 is preferably not less than 300mm (i.e. H in fig. 1 is not less than 300 mm).
For reference, as shown in fig. 3, the steel strands 4 in the embodiment are provided with multiple layers, and PVC sleeves 6 are sleeved on some of the steel strands 4, the specific number and length of the PVC sleeves 6 are determined according to the design condition to form a free shrinkage section, and the steel strands 4 are not prestressed in the area of the free shrinkage section, so that the end of the pre-tensioned prestressed composite beam 2 can be prevented from cracking due to the excessive concentration of concrete compressive stress caused by the tension of the steel strands 4.
In addition, under the condition of small earthquake, the strength of the steel strand can be 360N/m 2 Carrying out design calculation to meet the requirements of strength and rigidity; under the condition of heavy earthquake, the strength of the steel strand is 1570N/m 2 Conversion is carried out, and is far greater than 360N/m 2 . Wherein, referring to the specific definition of the relevant standard, the minor earthquake refers to the earthquake intensity with the exceeding probability of about 63% in 50 years in the area, namely the mode intensity, which is also called the frequent earthquake; the major earthquake refers to earthquake intensity with the exceeding probability of about 2% -3% in 50 years in the area, and is also called rare earthquake. The steel strand in the embodiment can be used as a plastic energy dissipation mechanism after crack development, and is beneficial to forming plastic hinges, so that common steel bars do not need to be added.
Further, the column cap 3 and the concrete frame column 1 are integrally cast, and reinforcing ribs are embedded in the column cap 3. The outer edge of the cap 3 is preferably flared 200-300mm (i.e., L2 in fig. 1 and 2 is preferably 200-300 mm) with respect to the body of the concrete frame column 1. The end part of the pre-tensioning prestressed composite beam 2 is supported by the column cap 3, so that a composite beam support frame can be omitted; in addition, the column caps 3 can provide safe storage for the vertical joints of the beam end nodes to resist shearing in the construction stage, and can be integrally cast with the superposed beam ends to form enlarged nodes in the use stage, so that the seismic performance of the nodes is enhanced.
The principle and the implementation of the present invention are explained in the present text by applying specific examples, and the above description of the examples is only used to help understanding the technical solution and the core idea of the present invention; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present invention in its embodiments.
Claims (7)
1. An assembled pretensioning method prestressed beam column connected node, characterized in that includes:
a concrete frame column, the top of which is provided with a column cap which extends outwards and expands, an
The pre-tensioning method prestressed composite beam comprises a post cap, a pre-tensioning method prestressed composite beam, a post cover and a connecting joint, wherein the end part of the pre-tensioning method prestressed composite beam is placed on the post cap, and concrete is poured between the pre-tensioning method prestressed composite beam and the post cap to form the connecting joint;
the end part of the pre-tensioning method prestress superposed beam is provided with a steel strand extending out of the interior of the superposed beam, and the steel strand extends into the connecting node and is bent upwards to be anchored in the connecting node.
2. The fabricated pretensioned prestressing beam/column connection node of claim 1, wherein: the steel strand extends into the core area of the connection node and at least exceeds the center line of the concrete frame column.
3. The fabricated pretensioned prestressing beam/column connection node of claim 2, wherein: the distance between the bending section of the steel strand and the central line of the concrete frame column is not less than 100mm, and the bending height of the bending section of the steel strand is not less than 300mm.
4. The fabricated pretensioned prestressing beam/column connection node of claim 3, wherein: the steel strand wires are provided with multiple layers, and a PVC sleeve is sleeved on part of the steel strand wires.
5. The fabricated pretensioned prestressing beam/column connection node according to any one of claims 1 to 4, wherein: under the condition of small earthquake, the strength of the steel strand is 360N/m 2 Designing; under the condition of heavy earthquake, the steel strand is self-bodyStrength of 1570N/m 2 。
6. The fabricated pretensioned prestressing beam-column connection node of claim 1, wherein: the column cap and the concrete frame column are integrally cast, and reinforcing ribs are embedded in the column cap.
7. The fabricated pretensioned prestressing beam-column connection node of claim 6, wherein: the outer edge of the column cap is expanded by 200-300mm relative to the column body of the concrete frame column.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211039600.XA CN115354745A (en) | 2022-08-29 | 2022-08-29 | Assembled pretensioning method prestressed beam column connected node |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211039600.XA CN115354745A (en) | 2022-08-29 | 2022-08-29 | Assembled pretensioning method prestressed beam column connected node |
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| CN115354745A true CN115354745A (en) | 2022-11-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211039600.XA Pending CN115354745A (en) | 2022-08-29 | 2022-08-29 | Assembled pretensioning method prestressed beam column connected node |
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- 2022-08-29 CN CN202211039600.XA patent/CN115354745A/en active Pending
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