CN115748960A - Beam end replaceable energy consumption device of beam-column joint - Google Patents

Beam end replaceable energy consumption device of beam-column joint Download PDF

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Publication number
CN115748960A
CN115748960A CN202211308774.1A CN202211308774A CN115748960A CN 115748960 A CN115748960 A CN 115748960A CN 202211308774 A CN202211308774 A CN 202211308774A CN 115748960 A CN115748960 A CN 115748960A
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shaped steel
plate
steel plate
embedded
precast concrete
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CN202211308774.1A
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葛琪
李有杰
熊峰
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Sichuan University
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Sichuan University
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00Adapting or protecting infrastructure or their operation
    • Y02A30/30Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways

Abstract

The invention provides a beam end replaceable energy consumption device of a beam-column node, which comprises an embedded steel plate and a metal damper, wherein the embedded steel plate is embedded in the end part of a steel bar of a precast concrete beam; the metal damper is arranged between the embedded steel plates of the two butted precast concrete beams; the end part of a steel bar in the precast concrete beam is in threaded connection with the threaded sleeve, and the embedded steel plate is fixedly connected with the threaded sleeve; the metal damper comprises H-shaped steel with holes, an end plate, a constraint plate, a filling plate and a dumbbell-shaped steel plate. According to the invention, the metal damper and the perforated H-shaped steel are connected with the precast concrete beam by adopting the high-strength bolt, and can be quickly replaced after an earthquake occurs; the post-earthquake restorable function of the beam-column joint of the fabricated concrete frame structure is realized, the post-earthquake repair time of the structure is saved, and the high benefit of the fabricated concrete structure in the whole life cycle is realized.

Description

Beam end replaceable energy consumption device of beam-column joint
Technical Field
The invention belongs to the technical field of buildings, and particularly relates to a beam end replaceable energy consumption device of a beam-column joint.
Background
The recoverable functional frame structure with the replaceable component is one of the main systems of the prior recoverable functional structure and generally has the characteristics of concentrated damage and easy disassembly and replacement.
Based on the advantages of the recoverable functional shockproof structure and the dry connection assembly type concrete frame structure, the recoverable functional shockproof structure with the replaceable components is combined with the new prefabrication assembly technology of the dry connection to form a new assembly type concrete frame structure system with the replaceable energy-consuming components, the structure can be constructed quickly, the field environment pollution is reduced, and the advantages of detachability, replaceability, high shockproof performance and the like are achieved. Meanwhile, the new structure system is low in maintenance and repair cost, small in indirect loss caused by the new structure system, high in benefit of the whole life cycle, and significant in practical significance in improving the disaster prevention and reduction capacity of the whole city, and a road with a replaceable component and an assembled concrete structure which is safe, environment-friendly and sustainable in development can be achieved.
The beam column node is a part which has larger internal force of a body system under the action of an earthquake and is easy to generate plastic deformation, and is a junction of prefabricated components of the assembly type concrete frame structure, so that the connection performance of the beam column node is a key factor for exerting the anti-seismic performance and realizing the restorable function of the assembly type concrete frame structure with the replaceable component, and the seismic energy is dissipated by utilizing the plastic deformation of the replaceable energy consumption component at the beam end, therefore, the replaceable energy consumption component is beneficial to the node energy consumption component to exerting good hysteretic performance under the action of repeated horizontal force, so that the seismic response is reduced, meanwhile, the replaceability of the energy consumption component is required to be ensured, and the use function of the energy consumption component is quickly recovered after the earthquake. Easy replacement of the damaged member and sufficient ductility are effective methods for ensuring that the structure has a function of recovering after an earthquake. When earthquake occurs, the metal material yields to generate plastic deformation, and the earthquake energy is dissipated through the plastic hysteresis of the metal material.
In the first prior art, energy consumption connection (REDC) can be replaced, and splicing of the REDC of the assembled concrete frame structure is arranged at a beam column node and consists of the REDC and a pin shaft system, wherein the pin shaft bears shearing force, and the REDC bears bending moment.
The REDC component comprises an energy consumption component, a column inner anchoring component and a beam inner anchoring component. The installation setting of removable power consumption connection is in the longitudinal reinforcement department of the upper and lower cross-section of beam-ends portion of beam-ends and post connection area, sets up the anchor steel billet in the beam column, connects steel billet and beam column inner longitudinal reinforcement welding. Two ends of the energy dissipation component are respectively welded with the anchoring steel blocks pre-embedded in the beam column, and two ends of the energy dissipation component are connected with the reinforcing steel bars in the beam column through the anchoring steel blocks arranged in the column and the beam and a welding process, so that beam column node connection of the prefabricated concrete structure is realized. The energy dissipation component consists of a core energy dissipation component (steel plate), a constraint cover plate and a filling steel plate.
The first prior art has the following disadvantages:
(1) the connection of the energy consumption component and other components adopts a welding mode, and procedures such as removing welding and the like are added during post-earthquake repair, so that the replaceability is poor;
(2) the steel block anchoring part at the prefabricated column end easily generates stress concentration on the joint surface, and the concrete is locally damaged;
(3) the REDC is arranged at the connecting end part of the beam column and is positioned at the position of the support, the core energy consumption part of the REDC still suffers from larger shearing force, and the metal yielding energy consumption device is not suitable for bearing the shearing force, so that the placement of the REDC is not good, and the energy consumption performance of the REDC cannot be fully exerted.
In the second prior art, the prefabricated concrete beam column is composed of a section of H-shaped steel short section with a web plate opening and is used for connecting the prefabricated concrete beam column. The end plate is mainly used for fixing, the energy dissipation device connected with the beam column mainly bears the combined action of bending moment, shearing force and axial force, the end plate is welded with the H-shaped steel, and the end plate is connected with the embedded steel plate in the beam column through bolts.
The second prior art has the following defects:
(1) the H-shaped steel bears the action of bending moment, shearing force and axial force and is in a complex stress state, cracks firstly occur at the welding position between the flange and the end plate and extend to the chamfer angle of the web plate opening, and the energy consumption effect of the device is not fully exerted;
(2) the H-shaped steel is weakened and in a complex stress state, and compared with a cast-in-place node, the mechanical property is not improved;
(3) when the beam column node is positioned at a position with large eccentricity, the H-shaped steel bears torque, and out-of-plane instability is easily caused.
In the prior art, the beam-column joint connecting device is composed of the following parts: the prefabricated reinforced concrete beam, the prefabricated reinforced concrete column, the prestressed reinforcement and the metal connecting piece. The both sides of roof beam set up the concrete beam recess, and the metal connecting piece outside sets up the lug, and the lug embedding is in the concrete beam recess. One section of the metal connecting piece is fixedly connected with the prefabricated reinforced concrete column, and the other end of the metal connecting piece is connected with the side face of the concrete beam. The prestressed tendons penetrate through the beam and the column and are anchored on the outer side of the column.
The third prior art has the following defects:
(1) stress concentration is easily generated on the joint surfaces of the upper and lower sections of the prefabricated beam-column joint, and concrete is locally damaged;
(2) prestress loss can be generated in the long-term use process, and the node integrity is reduced;
(3) prestress tensioning is needed in the construction process, and the number of working procedures is large.
(4) The beam and column are not removable and replaceable, and the recoverable functional structure is just as useless in the case of great damage to the beam and column after a strong shock.
In the technical scheme of the fourth prior art, a seismic elastic Prefabricated Column Flange Beam Column Joint (PCFBCJ) is composed of a round steel pipe column with a cantilever beam, a round steel pipe column with flanges, a common beam, two flange cover plates, two web connecting plates and a group of high-strength bolts. All the above welding processes of the parts are carried out in the factory to ensure the quality. The circular steel tube column with the cantilever beam and the circular steel tube column with the flange are quickly connected through the flange and the high-strength bolt on the construction site. The cantilever beam and the common beam are connected through the upper flange cover plate, the lower flange cover plate, the web plate connecting plate and the high-strength bolt. In order to improve the rotation capacity of the node and avoid collision between the cantilever beam and the common beam, a gap is arranged between the two beams.
The fourth prior art has the following defects:
(1) the two flange cover plates are not restrained outside the plane, and the compression side is easy to buckle.
(2) The non-replaceable part can generate the problems of hole slippage and the like at the position connected with the replaceable part, and although the energy consumption capability is ensured, the replaceable performance is obviously poorer.
Disclosure of Invention
In view of the above background, the present invention provides a beam end replaceable energy dissipation device for an assembled concrete recoverable function frame beam-column joint, wherein the replaceable energy dissipation device is used for connecting a beam-column, and energy dissipation is realized by using the tension-compression energy dissipation performance of a metal yielding energy dissipation member, and the replaceable energy dissipation device is used for bearing and transmitting the axial tension or pressure of the upper side edge or the lower side edge generated by the beam end bending moment of a frame structure under the action of an earthquake.
The technical problem to be solved by the invention is as follows:
(1) in the prior art, an energy consumption device is connected with other components by welding, so that the replaceability is poor;
(2) in the first and third prior art, stress concentration is easy to generate on the joint surface of the end part of the node area, and the concrete is locally damaged;
(3) in the first and second prior art, the metal energy dissipation parts bear larger shearing force and the energy dissipation parts are in a complex stress state, so that the energy dissipation cannot be fully exerted;
(4) in the second prior art, when the beam-column joint is positioned at a position with large eccentricity, the H-shaped steel bears torque, and out-of-plane instability is easily caused;
(5) compared with a cast-in-place node, the mechanical property of the prior art II is not improved;
(6) in the prior art, three construction processes are more, and the beam column does not have the detachability and replaceability;
(7) the fourth prior art cannot guarantee that the non-replaceable part enters plasticity after the replaceable part.
The specific technical scheme is as follows:
the replaceable energy consumption device for the beam end of the beam-column joint comprises an embedded steel plate and a metal damper, wherein the embedded steel plate is embedded in the end part of a steel bar of a precast concrete beam; the metal damper is arranged between the embedded steel plates of the two butted precast concrete beams;
the end parts of the steel bars in the precast concrete beam are connected with the threaded sleeves in a threaded manner, and the embedded steel plates are fixedly connected with the threaded sleeves;
the metal damper comprises H-shaped steel with holes, an end plate, a constraint plate, a filling plate and a dumbbell-shaped steel plate.
And reserving bolt holes on the pre-buried steel plate.
The left flange and the right flange of the perforated H-shaped steel are respectively fixedly connected with an end plate, and the end plates are fixedly connected with the embedded steel plate;
the upper flange and the lower flange of the perforated H-shaped steel are respectively provided with a dumbbell-shaped steel plate, the middle part of the dumbbell-shaped steel plate is narrow, the two ends of the dumbbell-shaped steel plate are wide, the two ends of the dumbbell-shaped steel plate are respectively fixed on the butted precast concrete beams, the middle part of the dumbbell-shaped steel plate is positioned at the perforated H-shaped steel, the two sides of the middle part are respectively filled with a filling plate, the middle part of the dumbbell-shaped steel plate is provided with a restraining plate, and the restraining plate and the filling plate are both fixed on the upper flange and the lower flange of the perforated H-shaped steel through bolts;
two ends of the dumbbell-shaped steel plate are connected with the embedded sleeves embedded from top to bottom of the precast concrete beam through bolts.
The dumbbell-shaped steel plate, the restraint plate and the filling plate form a replaceable metal yield energy dissipation assembly, the dumbbell-shaped steel plate is restrained by the restraint plate and concrete, and large-amplitude buckling cannot occur during compressive yield. The buckling energy dissipation part made of metal materials is not suitable for bearing shearing force, so that the arranged perforated H-shaped steel bears the shearing force on one hand and is convenient for connection of nodes on the other hand. The hole is formed in the H-shaped steel with the hole, the cross section of the part is weakened, plastic deformation can firstly occur at the part of the replaceable energy consumption connecting device during middle or large earthquakes, the dumbbell-shaped steel plate enters a yielding state before the structural main body component, the dumbbell-shaped steel plate is intensively damaged, and the energy consumption component is replaced after the earthquakes. Under the action of small vibration, the metal yielding energy dissipation assemblies arranged on the upper side and the lower side of the beam end keep elastic and provide bending rigidity for the beam-column connecting section; under the action of medium or large earthquakes, the metal yielding energy dissipation assembly is pulled or pressed to yield, the hysteretic performance of the assembly is utilized to dissipate earthquake energy, the dynamic response value of the frame structure is reduced, damage is concentrated on the energy dissipation assembly of the replaceable energy dissipation connecting device, and the main body part of the frame structure still keeps elasticity. After an earthquake occurs, the connecting bolts of the energy dissipation assemblies and the H-shaped steel and concrete beams are loosened, the damaged energy dissipation assemblies are taken out, new energy dissipation assemblies are installed again, and the purpose of quickly recovering the using function of the structure after the earthquake is achieved. The invention has the characteristics that the energy dissipation assembly is connected with the rest parts by bolts, so that the assembly is convenient to disassemble and replace, the connection is reliable, the stable ductility energy dissipation capability of the metal energy dissipation assembly can be exerted, the damage is only concentrated on the energy dissipation assembly, the energy dissipation assembly can be conveniently and quickly replaced after a strong earthquake, and the quick recovery of the post-earthquake function of the assembled concrete frame structure is realized.
The technical scheme of the invention brings beneficial effects
(1) The metal damper and the perforated H-shaped steel are connected with the precast concrete beam by adopting high-strength bolts, and can be quickly replaced after the earthquake;
(2) the metal yield energy dissipation pieces (dumbbell-shaped steel plates) are arranged on the upper and lower sections of the precast concrete beam, bear bending moment load and dissipate seismic energy, prevent the tension and compression damage of concrete and improve the seismic resistance;
(3) the post-earthquake restorable function of the beam-column joint of the fabricated concrete frame structure is realized, the post-earthquake repair time of the structure is saved, the earthquake loss of the fabricated concrete frame structure is greatly reduced, and the full life cycle high benefit of the fabricated concrete structure is realized.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is an assembly view of the present invention.
Detailed Description
The specific technical scheme of the invention is explained by combining the attached drawings.
As shown in fig. 1 to 2, the energy consumption device with a replaceable beam end of a beam-column joint is characterized by comprising an embedded steel plate 3 and a metal damper, wherein the embedded steel plate 3 is embedded in the end part of a steel bar of a precast concrete beam 2; the metal damper is arranged between the butted precast concrete beam 2 and the concrete column 1 with the beam end;
the metal damper comprises perforated H-shaped steel 5, wherein the left flange and the right flange of the perforated H-shaped steel 5 are respectively fixed on a connecting end plate 6, and the end plate 6 is fixedly connected with the embedded steel plate 3 through bolts;
the upper flange and the lower flange of the H-shaped steel 5 with the hole are respectively provided with a dumbbell-shaped steel plate 9, the middle part of the dumbbell-shaped steel plate 9 is narrow, and the two ends of the dumbbell-shaped steel plate are wide; two ends of a dumbbell-shaped steel plate 9 are respectively fixed on the beam of the butted precast concrete beam 2 and the beam of the concrete column (1) with the beam end, the middle part of the dumbbell-shaped steel plate 9 is positioned at the position of the H-shaped steel 5 with the opening, two sides of the middle part are respectively filled with a filling plate 8, the middle part is provided with a restraint plate 7, and the restraint plate 7 and the filling plate 8 are both fixed on the upper flange and the lower flange of the H-shaped steel 5 with the opening through bolts.
The end part of the steel bar in the precast concrete beam 2 is connected with the threaded sleeve 4 in a threaded manner, and the embedded steel plate 3 is fixedly connected with the threaded sleeve 4.
Two ends of the dumbbell-shaped steel plate 9 are connected with the embedded sleeves 10 embedded from top to bottom of the precast concrete beam 2 through bolts.

Claims (3)

1. The replaceable energy consumption device for the beam end of the beam-column joint is characterized by comprising an embedded steel plate (3) and a metal damper, wherein the embedded steel plate (3) is embedded in the end part of a steel bar of a precast concrete beam (2); the metal damper is arranged between the butted precast concrete beam (2) and the concrete column (1) with the beam end;
the metal damper comprises perforated H-shaped steel (5), wherein the left flange and the right flange of the perforated H-shaped steel (5) are respectively and fixedly connected with an end plate (6), and the end plate (6) is fixedly connected with an embedded steel plate (3);
the upper flange and the lower flange of the H-shaped steel (5) with the holes are respectively provided with a dumbbell-shaped steel plate (9), the middle part of the dumbbell-shaped steel plate (9) is narrow, and the two ends of the dumbbell-shaped steel plate are wide; the two ends of the dumbbell-shaped steel plates (9) are fixed on the butted precast concrete beams (2) respectively, the middle parts of the dumbbell-shaped steel plates (9) are located at the positions of the open H-shaped steel (5), the filling plates (8) are filled on the two sides of the middle parts respectively, the middle parts are provided with the restraint plates (7), and the restraint plates (7) and the filling plates (8) are fixed on the upper flange and the lower flange of the open H-shaped steel (5) through bolts.
2. The replaceable energy consumption device for the beam end of the beam-column joint as claimed in claim 1, wherein the end of the steel bar in the precast concrete beam (2) is connected with the threaded sleeve (4) in a threaded manner, and the embedded steel plate (3) is fixedly connected with the threaded sleeve (4).
3. The replaceable energy consumption device for the beam end of the beam-column joint as claimed in claim 1, wherein two ends of the dumbbell-shaped steel plate (9) are connected with embedded sleeves (10) embedded in the precast concrete beam (2) up and down through bolts.
CN202211308774.1A 2022-10-25 2022-10-25 Beam end replaceable energy consumption device of beam-column joint Pending CN115748960A (en)

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Application Number Priority Date Filing Date Title
CN202211308774.1A CN115748960A (en) 2022-10-25 2022-10-25 Beam end replaceable energy consumption device of beam-column joint

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211308774.1A CN115748960A (en) 2022-10-25 2022-10-25 Beam end replaceable energy consumption device of beam-column joint

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Publication Number Publication Date
CN115748960A true CN115748960A (en) 2023-03-07

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110468987A (en) * 2019-08-08 2019-11-19 重庆大学 A kind of novel anti-buckling replaceable connecting node of support-RC frame

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110468987A (en) * 2019-08-08 2019-11-19 重庆大学 A kind of novel anti-buckling replaceable connecting node of support-RC frame

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