CN112814276A - Steel-concrete composite beam with friction connection for limiting transfer of floor slab inertia force - Google Patents
Steel-concrete composite beam with friction connection for limiting transfer of floor slab inertia force Download PDFInfo
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- CN112814276A CN112814276A CN202110171640.9A CN202110171640A CN112814276A CN 112814276 A CN112814276 A CN 112814276A CN 202110171640 A CN202110171640 A CN 202110171640A CN 112814276 A CN112814276 A CN 112814276A
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- floor slab
- steel
- concrete
- slotted
- concrete floor
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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
- E04C3/29—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces built-up from parts of different material, i.e. composite structures
- E04C3/293—Joists; 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
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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
- E04B1/38—Connections for building structures in general
- E04B1/58—Connections for building structures in general of bar-shaped building elements
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- 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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- Environmental & Geological Engineering (AREA)
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- Electromagnetism (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Buildings Adapted To Withstand Abnormal External Influences (AREA)
Abstract
The invention discloses a steel-concrete combined beam with friction connection for limiting the transmission of the inertia force of a floor slab, which belongs to the technical field of civil engineering structures, wherein the concrete floor slab is arranged above a slotted steel beam, two rows of through holes are symmetrically arranged on the concrete floor slab, a slotted hole corresponding to the concrete floor slab is arranged on an upper steel plate of the slotted steel beam, a high-strength bolt penetrates through the through hole, and a nut is arranged at the lower part of the high-strength bolt and is used for pre-tightening the concrete floor slab and the slotted steel beam; a cover plate is fixed on the upper part of the nut, and a first gasket is bonded on the cover plate through special glue; the second gasket sets up between slotted girder steel and concrete floor, and it bonds on concrete floor through the structural adhesive. The beneficial effects are that: under the action of earthquake, the composite beam can bear and transmit longitudinal shearing force, so that the section steel and the concrete can not deform freely, and simultaneously the composite beam resists the lifting force of the concrete floor slab and the slotted steel beam to limit the vertical separation of the concrete floor slab and the slotted steel beam.
Description
Technical Field
The invention belongs to the technical field of civil engineering structures, and relates to a steel-concrete composite beam with friction connection for limiting the transfer of floor slab inertia force.
Background
The mass accumulated on the floor slab transmits the inertial force generated under the action of earthquake to the lateral force resisting system. For floors, excessive inertial forces will cause inelastic and non-ductile reactions within the slab. For the opposite lateral force system, large floor accelerations are observed even though ductile non-linear reactions occur due to the influence of second and higher order modes. And the interaction of the floor slab and the lateral force resisting system causes the increase of the overturning moment and the lateral force resisting system on the shearing force demand, and has great significance for limiting the transmission of the inertia force of the floor slab.
Many structures around the world use frictional connections rather than relying on yielding to dissipate energy during seismic shocks. The structure that produces keeps lower damage relatively from this, and the damage of concentrating on the bolt after the shake can be repaired conveniently through changing the bolt, and the structure after the shake of being convenient for is restoreed fast and the component is replaced.
The shear connector mainly bears the longitudinal shear force on the interface between the concrete floor slab and the steel beam in the steel-concrete composite beam structure and resists relative sliding and lifting between the concrete floor slab and the steel beam. Rather, an asymmetric frictional connection can just dissipate seismic energy by frictional slippage.
Friction type joints integrate steel beams and concrete floor panels by friction, most typically with high-strength bolts. The pre-pressure is applied to increase the extrusion effect so as to improve the friction force of the contact surface and simultaneously enhance the drawing resistance of the interface, and the connection form is usually applied to a combined member formed by precast concrete and section steel.
When the steel-concrete combined beam bears load, the steel can fully exert the tensile property, and the concrete can fully exert the compression resistance. Therefore, the composite beam saves steel and concrete materials, reduces self weight, has the advantages of good stress performance, good overall performance, simplified construction, improved fire resistance and the like, can save engineering materials and reduce the construction cost, and has been widely valued and developed at home and abroad.
Disclosure of Invention
Based on the traditional steel-concrete combined connection, the invention better limits the transmission of the inertia force of the floor slab through the asymmetric friction connection, protects the steel-concrete combined beam, avoids the damage caused by the earthquake, and can help the combined beam to consume a part of energy. Under the strong earthquake, the yield energy consumption is replaced by the friction energy consumption, the earthquake energy is dissipated in two stages, the transmission of the inertia force of the floor slab is limited, the generated structure keeps relatively low damage, only the bolt and the gasket are related to a sliding mechanism and can be replaced, and the quick repair and component replacement of the structure after the earthquake are facilitated.
The specific scheme is as follows: a steel-concrete composite beam with friction joint for limiting the transmission of floor slab inertia force, comprising: the high-strength bolt is arranged at the lower part of the high-strength bolt and used for pre-tightening the concrete floor slab and the slotted steel beam; a cover plate is fixed on the upper part of the nut, and a first gasket is bonded on the cover plate through special glue; the second gasket sets up between slotted girder steel and concrete floor, and it bonds on concrete floor through the structural adhesive.
Preferably, the nut further comprises a belleville spring, and the belleville spring is arranged between the nut and the cover plate; the disk spring is used for protecting the surface of the connected piece from being scratched by the nut, dispersing the pressure of the nut on the connected piece, reducing the separation caused by vibration, reducing the loss of pretightening force and reducing the adverse effect caused by friction heating.
Preferably, the spring further comprises a flat washer, and the flat washer is arranged between the belleville spring and the nut.
Preferably, the through hole of the concrete floor is embedded with a bolt hole channel.
Preferably, the slotted shape of the slotted steel beam is rectangular.
Preferably, the long side of the rectangular slot is the same as the length direction of the steel beam.
The invention has the beneficial effects that:
the invention adopts asymmetric friction, which is different from symmetric friction, and the gaskets slide asymmetrically on two sides of the slotted steel plate, so that energy consumption can be well realized in two stages, and an energy consumption mechanism is provided for a steel-concrete combined structure. The problem of structural damage caused by the transmission of the inertia force of the floor slab under the action of an earthquake is well solved while the friction energy consumption is realized. In extreme conditions, the seismic energy will be dissipated by the stable sliding of the dual platforms of their critical dissipative components (i.e. asymmetric frictional connections). The composite beam greatly weakens the earthquake action under the earthquake action. In extreme conditions, seismic energy will be dissipated by sliding friction.
Under the action of earthquake, the combined beam can bear and transmit the longitudinal shearing force of the contact surface of the slotted steel beam and the concrete floor slab, so that the sliding of the interface is restrained, the section steel and the concrete cannot deform freely, and the combined beam resists the lifting force of the concrete floor slab and the slotted steel beam to limit the vertical separation of the concrete floor slab and the slotted steel beam, thereby ensuring that the steel-concrete combined structure can exert the combined effect.
The device is convenient to install and convenient to replace and maintain after being damaged.
Drawings
FIG. 1 is a perspective view of the present invention;
FIG. 2 is a front view of the present invention;
FIG. 3 is a left side view of the present invention;
FIG. 4 is a top view of the present invention;
FIG. 5 is an exploded view of the present invention;
FIG. 6 is a schematic diagram of the operation of the present invention;
fig. 7 is a schematic diagram of energy consumption of the composite beam of the present invention under a vibration condition.
Description of the reference numerals
1-high-strength bolt, 2-concrete floor, 3-gasket, 4-slotted steel beam, 5-cover plate, 6-belleville spring, 7-flat washer and 8-nut.
Detailed Description
The invention is further elucidated with reference to the drawings and the detailed description. It should be noted that the terms "front," "back," "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component. In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention.
As shown in fig. 1, the steel-concrete composite beam with friction connection for limiting the transfer of the floor slab inertia force, provided by the invention, comprises a high-strength bolt 1, a concrete floor slab 2, a first gasket 3, a second gasket, a slotted steel beam 4, a cover plate 5 and a nut 8, wherein the concrete floor slab 2 is arranged above the slotted steel beam 4, two rows of through holes are symmetrically arranged on the concrete floor slab 2, a slot corresponding to the concrete floor slab 2 is formed in an upper steel plate of the slotted steel beam 4, the high-strength bolt 1 penetrates through the through holes, and the nut 8 is arranged at the lower part of the high-strength bolt 1 and used for pre-tightening the concrete floor slab 2 and the slotted steel beam 4; a cover plate 5 is fixed on the upper part of the nut, and a first gasket 3 is bonded on the cover plate; the second gasket is arranged between the slotted steel beam 4 and the concrete floor 2 and is bonded on the concrete floor 2; the belleville spring 6 is arranged between the nut 8 and the cover plate 5; a flat washer 7 is arranged between the belleville spring 6 and the nut 8. A bolt hole channel is pre-embedded in the through hole of the concrete floor slab 2, and the slotted shape of the slotted steel beam 4 is rectangular; the long side of the rectangular slot is the same as the length direction of the steel beam.
The invention breaks through the traditional earthquake-proof method of consuming earthquake energy by depending on the ductility of the structure, and by adding asymmetric friction connection in the structure, compared with the common steel-concrete composite beam, the initial rigidity and the bearing capacity are both larger, thus being beneficial to controlling the displacement and the bearing capacity under the action of earthquake and limiting the transmission of the floor slab inertia force, and the steel-concrete composite beam with friction connection for limiting the transmission of the floor slab inertia force can dissipate a part of earthquake energy and reduce the damage of the main body structure under the action of earthquake.
In addition, the invention adopts the bolt connection which is convenient to install, the construction process of the energy dissipation element is simple, the modular, standardized and large-scale production can be realized in a factory, the disassembly and the replacement are easy, the repair cost of the building after the earthquake can be reduced, and the invention has important scientific significance and economic value.
According to the invention, by adopting an asymmetric friction principle, the energy consumption is carried out in two stages by using the gasket as a friction material, the specific energy consumption condition is shown in figure 7, and an energy consumption mechanism is provided for the steel-concrete combined structure. The problem of structural damage caused by the transmission of the inertia force of the floor slab under the action of an earthquake is well solved while the friction energy consumption is realized. In extreme conditions, the seismic energy will be dissipated by the stable sliding of the dual platforms of their critical dissipative components (i.e. asymmetric frictional connections).
The steel-concrete composite beam consumes energy by stages through asymmetric friction connection, the steel-concrete composite beam works integrally under small and large earthquakes, the floor slab firstly shears and slides along the slot to form a first sliding platform under the medium and large earthquakes, and the cover plate is driven to slide to form a second sliding platform along with the increase of the earthquake action.
The main friction direction is front and back movement.
As shown in figure 6, which is a working schematic diagram of the invention, the steel-concrete composite beam works integrally under small earthquake, the floor slab firstly shears and slides along the slot to form a first sliding platform under medium and large earthquake, and the cover plate is driven to slide to form a second sliding platform along with the increase of earthquake action.
The present invention has been described in more detail above. It is to be understood that the invention is not limited to the particular embodiments described above, in that devices and structures not described in detail are understood to be implemented in a manner common in the art; those skilled in the art can make many possible variations and modifications to the disclosed embodiments, or modify equivalent embodiments to equivalent variations, without departing from the spirit of the invention, using the methods and techniques disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention, unless the contents of the technical solution of the present invention are departed.
Claims (6)
1. A steel-concrete composite beam with a friction joint for limiting the transfer of the inertial force of a floor slab, comprising: the concrete floor slab comprises a high-strength bolt (1), a concrete floor slab (2), a first gasket (3), a second gasket, a slotted steel beam (4), a cover plate (5) and nuts (8), wherein the concrete floor slab (2) is arranged above the slotted steel beam (4), two rows of through holes are symmetrically arranged on the concrete floor slab (2), a slot corresponding to the concrete floor slab (2) is formed in an upper steel plate of the slotted steel beam (4), the high-strength bolt (1) penetrates through the through holes, and the nuts (8) are arranged on the lower portion of the high-strength bolt (1) and used for pre-tightening the concrete floor slab (2) and the slotted steel beam (4); a cover plate (5) is fixed on the upper part of the nut, and a first gasket (3) is bonded on the cover plate; the second gasket sets up between slotted girder steel (4) and concrete floor (2), and it bonds on concrete floor (2).
2. A steel-concrete composite beam with friction connection for limiting the transfer of the inertia force of the floor slab according to claim 1, characterized in that it further comprises a belleville spring (6), said belleville spring (6) being arranged between the nut (8) and the cover plate (5).
3. A steel-concrete composite beam with friction connection for limiting the transfer of the inertia force of the floor slab according to claim 2, characterized in that it further comprises a flat washer (7), said flat washer (7) being arranged between the belleville spring (6) and the nut (8).
4. The steel-concrete composite beam with friction joint for limiting the transfer of the inertia force of the floor slab as claimed in claim 1, wherein the bolt hole is pre-embedded in the through hole of the concrete floor slab (2).
5. A steel-concrete composite beam with friction joint for limiting the transfer of the inertia force of the floor slab according to claim 1, wherein the slotted shape of the slotted steel beam (4) is rectangular.
6. A steel-concrete composite beam with friction joint for limiting the transfer of floor slab inertia force according to claim 5, wherein the long side of the rectangular slot is the same as the length direction of the steel beam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110171640.9A CN112814276B (en) | 2021-02-08 | 2021-02-08 | Steel-concrete composite beam with friction connection for limiting transfer of floor slab inertia force |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110171640.9A CN112814276B (en) | 2021-02-08 | 2021-02-08 | Steel-concrete composite beam with friction connection for limiting transfer of floor slab inertia force |
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| Publication Number | Publication Date |
|---|---|
| CN112814276A true CN112814276A (en) | 2021-05-18 |
| CN112814276B CN112814276B (en) | 2023-03-24 |
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| CN202110171640.9A Active CN112814276B (en) | 2021-02-08 | 2021-02-08 | Steel-concrete composite beam with friction connection for limiting transfer of floor slab inertia force |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113982346A (en) * | 2021-10-18 | 2022-01-28 | 东南大学 | Interface-enhanced viscoelastic damper |
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| CN109958198A (en) * | 2019-04-29 | 2019-07-02 | 福州大学 | Full assembled friction energy-dissipating Self-resetting bean column node and its assembly method |
| CN110172908A (en) * | 2019-04-17 | 2019-08-27 | 浙江交通职业技术学院 | A kind of pre-embedded bolt fastening node of assembled steel reinforced concrete composite bridge and preparation method thereof |
| CN112049500A (en) * | 2020-08-07 | 2020-12-08 | 北京工业大学 | Multistage damping flat beam-floor system based on solid spiral spring pin connection |
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2021
- 2021-02-08 CN CN202110171640.9A patent/CN112814276B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN207647269U (en) * | 2017-10-27 | 2018-07-24 | 陈云 | A kind of replaceable energy consumption coupling beam |
| CN108894431A (en) * | 2018-07-26 | 2018-11-27 | 广西大学 | Friction shear resisting fashioned iron-precast concrete combination beam preparation and its construction method |
| CN109811965A (en) * | 2019-02-02 | 2019-05-28 | 天津大学 | It is a kind of to be bolted high strength steel plate spliced girder-concrete slab combination beam entirely |
| CN110172908A (en) * | 2019-04-17 | 2019-08-27 | 浙江交通职业技术学院 | A kind of pre-embedded bolt fastening node of assembled steel reinforced concrete composite bridge and preparation method thereof |
| CN109958198A (en) * | 2019-04-29 | 2019-07-02 | 福州大学 | Full assembled friction energy-dissipating Self-resetting bean column node and its assembly method |
| CN112049500A (en) * | 2020-08-07 | 2020-12-08 | 北京工业大学 | Multistage damping flat beam-floor system based on solid spiral spring pin connection |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113982346A (en) * | 2021-10-18 | 2022-01-28 | 东南大学 | Interface-enhanced viscoelastic damper |
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| CN112814276B (en) | 2023-03-24 |
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