CN112096115A - Reinforcing structure for improving earthquake-proof performance of earthquake-damaged RC frame structure and construction method - Google Patents
Reinforcing structure for improving earthquake-proof performance of earthquake-damaged RC frame structure and construction method Download PDFInfo
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- CN112096115A CN112096115A CN202011075261.1A CN202011075261A CN112096115A CN 112096115 A CN112096115 A CN 112096115A CN 202011075261 A CN202011075261 A CN 202011075261A CN 112096115 A CN112096115 A CN 112096115A
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- frame
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- buckling restrained
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- restrained brace
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
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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
- 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
- E04H9/021—Bearing, supporting or connecting constructions specially adapted for such buildings
Abstract
The invention relates to a reinforcing structure for improving the anti-seismic performance of an earthquake-damaged RC frame structure and a construction method, the reinforcing structure comprises frame columns and frame beams, adjacent frame columns are connected through the frame beams, a plurality of layers of frame beams are arranged between the adjacent frame columns at intervals from top to bottom, the adjacent frame beams are connected through buckling restrained supporting rods, concrete is removed from the seriously damaged parts of plastic hinge areas on beam column nodes, the frame columns and the frame beams to form a repairing area, and cement-based composite materials without coarse aggregates are poured in the repairing area for repairing.
Description
Technical Field
The invention relates to a reinforcing structure for improving the seismic performance of a seismic damage RC frame structure and a construction method.
Background
Earthquake can cause the destruction of buildings, and seriously affect the life and property safety of people. The RC frame structure has the advantages of flexible structural space arrangement, short construction period, mature construction technology and the like, and is one of the most common structural systems. The results of earthquake disasters of the past show that: in earthquake-stricken areas, the RC frame structure has the defects of small lateral stiffness, low horizontal resistance and the like. Except that a few severely damaged structures need to be overturned for reconstruction, the slightly or moderately damaged structures are still in a repairable stage and still can meet the seismic fortification targets of 'small earthquake undamaged, medium earthquake repairable and large earthquake undamaged'. Therefore, the RC frame structure with the seismic damage is reinforced and repaired again, so that the RC frame structure meets the requirements of bearing capacity and seismic performance under the existing specification, and the RC frame structure has very important engineering application significance.
Disclosure of Invention
The invention provides a reinforcing structure for improving the seismic performance of a seismic damage RC frame structure and a construction method.
The invention solves the technical problem by adopting a scheme that a reinforcing structure for improving the anti-seismic performance of an earthquake damage RC frame structure comprises frame columns and frame beams, wherein adjacent frame columns are connected through the frame beams, a plurality of layers of frame beams are arranged between the adjacent frame columns at intervals from top to bottom, the adjacent frame beams are connected through buckling constraint supporting rods, concrete is removed from seriously damaged parts of plastic hinge areas on beam column nodes, the frame columns and the frame beams to form a repairing area, and cement-based composite materials without coarse aggregate are poured in the repairing area for repairing.
Furthermore, a single oblique buckling restrained supporting rod is arranged between adjacent frame beams, and two ends of the oblique buckling restrained supporting rod are sealed and connected with two beam column nodes which are arranged diagonally.
Furthermore, two buckling restrained supporting rods which are arranged in bilateral symmetry are arranged between the adjacent frame beams, one ends of the two buckling restrained supporting rods are connected with the middle of one frame beam, and the other ends of the two buckling restrained supporting rods are respectively connected with the other frame beam and the frame column and the beam column node at the same side of the frame column to form a V-shaped or inverted V-shaped supporting structure.
Furthermore, the inclination angle of the oblique buckling restrained brace rod is 35-55 degrees.
Furthermore, a connecting plate is arranged on the frame beam or at the connecting part of the beam column joint and the buckling restrained supporting rod.
Furthermore, the connecting plate is fixedly connected with the frame beam and the beam column node through expansion type bolts.
Furthermore, a splice plate is arranged between the connecting plate and the buckling restrained supporting rod, one end of the splice plate is fixedly connected with the buckling restrained supporting rod through a high-strength bolt, and the other end of the splice plate is connected with the connecting plate through a high-strength bolt, welded or hinged.
A construction method for improving the earthquake resistance of an earthquake damage RC frame structure comprises the following steps:
the method comprises the following steps: chiseling out concrete in the core area of the earthquake damage RC frame node and broken concrete in the plastic hinge area;
step two: cleaning the concrete surface of the chiseling area by using a bristle brush, and simultaneously washing the surface by using tap water;
step three: the method comprises the following steps of (1) supporting a formwork in a concrete chiseling area, installing a pre-buried connecting plate, pouring a prepared cement-based composite material without coarse aggregate into the chiseling area after cement paste is brushed on the surface of the chiseling area, maintaining, and fixing the pre-buried connecting plate with frame beams and beam column nodes respectively into a whole through expansion bolts after maintenance is finished;
step four: and a buckling restrained brace is arranged between adjacent frame beams on a weak layer of the beam-column joint shock loss, one end of the splicing plate is connected with the buckling restrained brace through a high-strength bolt, and the other end of the splicing plate is fixedly connected with the connecting plate through the high-strength bolt in a welding or riveting mode.
In the third step, the cement-based composite material without the coarse aggregate, which is at least two strength grades higher than the original structural concrete, is adopted; in the third step, a maintenance scheme is formulated according to the field environment, watering is carried out in time during the maintenance period to prevent and control the generation of shrinkage cracks, watering is carried out for more than four times every day in the first 7 days, and the maintenance time is not less than 14 days;
in the fifth step, if a single support is arranged on the buckling restrained brace, the angle range between the support and the frame beam is required to be 35-55 degrees; if the buckling restrained brace is provided with two braces, one end of each buckling restrained brace is connected with the middle part of one frame beam, the other end of each buckling restrained brace is connected with the other frame beam, the other frame column and a beam column node on the same side of the frame column to form a V-shaped or inverted V-shaped brace structure, the angle range of the braces and the frame beams is required to be within the range of 35-55 degrees, and the braces and the frame beams form a reliable whole with the structure.
Compared with the prior art, the invention has the following beneficial effects: simple structure, reasonable in design, easily construction adopts the cement-based combined material and the BRB of no coarse aggregate to carry out the composite reinforcement, consolidates back RC frame construction and can strengthen bearing capacity and anti lateral rigidity by a wide margin, improves the anti-seismic performance of the structure that decreases of earthquake, can show the reinforcement effect that reaches the RC frame construction that decreases of earthquake.
Drawings
The invention is further described with reference to the following figures.
FIG. 1 is a block diagram of a reinforcement structure;
FIG. 2 is a schematic view of a first arrangement of buckling restrained braces;
FIG. 3 is a schematic view of a second arrangement of buckling restrained braces;
FIG. 4 is a schematic view of a third arrangement of buckling restrained braces;
FIG. 5 is a schematic view of the construction of the connection plate secured at a node of a beam column;
FIG. 6 is a schematic view of the construction of the attachment plate secured at the cross-center rail.
In the figure: 1-a frame beam; 2-a repair area; 3-frame columns; 4-buckling restrained brace bar; 5-expansion type bolt; 6-connecting plates; 7-high strength bolts; 8-splicing plates.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
As shown in figures 1-6, a reinforcement structure for improving the earthquake resistance of an earthquake damage RC frame structure comprises frame columns 3 and frame beams 1, wherein adjacent frame columns are connected through frame beams, a plurality of layers of frame beams are arranged between the adjacent frame columns at intervals from top to bottom, the adjacent frame beams are connected through buckling restrained support rods 4, concrete is removed from the seriously damaged parts of plastic hinge areas on the beam column nodes, the frame columns and the frame beams to form a repair area 2, a cement-based composite material without coarse aggregate is poured in the repair area for repair, the removed concrete is replaced by the cement-based composite material without coarse aggregate, the energy consumption of the beam column nodes and the plastic hinge areas can be increased, the earthquake resistance can be improved, the bearing capacity and the earthquake resistance of the earthquake damage RC frame structure can be greatly improved through the restrained support, the energy can be fully absorbed during the earthquake, the structure can be kept complete and not damaged, the buckling restrained brace can change the stress characteristics of the frame and can be used as an energy dissipation element to play a first line of defense against earthquakes.
In this example, the coarse aggregate-free cement-based composite material is fine-grained concrete, UHPC concrete, epoxy mortar concrete or ECC concrete.
In this embodiment, set up single oblique bucking restraint bracing piece between the adjacent frame roof beam, oblique bucking restraint bracing piece both ends are sealed and are connected with two beam column nodes that are the diagonal angle setting.
In this embodiment, two buckling-restrained supporting rods are symmetrically arranged between two adjacent frame beams, one end of each buckling-restrained supporting rod is connected with the middle of one frame beam, and the other end of each buckling-restrained supporting rod is connected with a beam-column node of the other frame beam, the other frame column and the beam-column node on the same side of the frame column to form a V-shaped or inverted-V-shaped supporting structure.
In this embodiment, the inclined buckling restrained brace has an inclination angle of 35 ° to 55 °.
In this embodiment, a connecting plate 6 is arranged at the connecting position of the frame beam or the beam-column joint and the buckling-restrained supporting rod.
In the embodiment, the connecting plate and the frame beam, and the connecting plate and the beam column node are fixedly connected through expansion type bolts 5.
In this embodiment, a splice plate 8 is arranged between the connecting plate and the buckling-restrained supporting rod, one end of the splice plate is fixedly connected with the buckling-restrained supporting rod through a high-strength bolt 7, and the other end of the splice plate is connected with the connecting plate through a high-strength bolt, welded or hinged.
A construction method for improving the earthquake resistance of an earthquake damage RC frame structure comprises the following steps:
the method comprises the following steps: chiseling out concrete in the core area of the earthquake damage RC frame node and broken concrete in the plastic hinge area;
step two: cleaning the concrete surface of the chiseling area by using a bristle brush, and simultaneously washing the surface by using tap water;
step three: the method comprises the following steps of (1) supporting a formwork in a concrete chiseling area, installing a pre-buried connecting plate, pouring a prepared cement-based composite material without coarse aggregate into the chiseling area after cement paste is brushed on the surface of the chiseling area, maintaining, and fixing the pre-buried connecting plate with frame beams and beam column nodes respectively into a whole through expansion bolts after maintenance is finished;
step four: and a buckling restrained brace is arranged between adjacent frame beams on a weak layer of the beam-column joint shock loss, one end of the splicing plate is connected with the buckling restrained brace through a high-strength bolt, and the other end of the splicing plate is fixedly connected with the connecting plate through the high-strength bolt in a welding or riveting mode.
In the third step, the cement-based composite material without the coarse aggregate, which is at least two strength grades higher than the original structural concrete, is adopted; in the third step, a maintenance scheme is formulated according to the field environment, watering is carried out in time during the maintenance period to prevent and control the generation of shrinkage cracks, watering is carried out for more than four times every day in the first 7 days, and the maintenance time is not less than 14 days;
in the fifth step, if a single support is arranged on the buckling restrained brace, the angle range between the support and the frame beam is required to be 35-55 degrees; if the buckling restrained brace is provided with two braces, one end of each buckling restrained brace is connected with the middle part of one frame beam, the other end of each buckling restrained brace is connected with the other frame beam, the other frame column and a beam column node on the same side of the frame column to form a V-shaped or inverted V-shaped brace structure, the angle range of the braces and the frame beams is required to be within the range of 35-55 degrees, and the braces and the frame beams form a reliable whole with the structure.
If this patent discloses or refers to parts or structures that are fixedly connected to each other, the fixedly connected may be understood as: a detachable fixed connection (for example using a bolt or screw connection) can also be understood as: non-detachable fixed connections (e.g. riveting, welding), but of course, fixed connections to each other may also be replaced by one-piece structures (e.g. manufactured integrally using a casting process) (unless it is obviously impossible to use an integral forming process).
In the description of this patent, it is to be understood that the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the patent, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the patent.
The above-mentioned preferred embodiments, further illustrating the objects, technical solutions and advantages of the present invention, should be understood that the above-mentioned are only preferred embodiments of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides an improve seismic damage RC frame construction seismic performance's reinforced structure which characterized in that: the concrete-free concrete repairing method comprises frame columns and frame beams, wherein adjacent frame columns are connected through the frame beams, a plurality of layers of frame beams are arranged between the adjacent frame columns at intervals from top to bottom, the adjacent frame beams are connected through buckling constraint supporting rods, concrete is removed from serious damage positions of plastic hinge areas on beam column nodes, the frame columns and the frame beams to form repairing areas, and cement-based composite materials without coarse aggregates are poured in the repairing areas for repairing.
2. The reinforcement structure for improving the seismic performance of a seismic damage RC frame structure of claim 1, wherein: a single oblique buckling restrained supporting rod is arranged between adjacent frame beams, and two ends of the oblique buckling restrained supporting rod are sealed and connected with two beam column joints which are arranged diagonally.
3. The reinforcement structure for improving the seismic performance of a seismic damage RC frame structure of claim 2, wherein: two buckling restrained brace rods that bilateral symmetry set up are set up between the adjacent frame roof beam, and two buckling restrained brace rod one end all are connected with a frame roof beam middle part, and the other end of two buckling restrained brace rods is connected with another frame roof beam and frame post rather than the beam column node of homonymy respectively and forms V font or the font of falling V bearing structure.
4. The reinforcement structure for improving earthquake-proof performance of earthquake damage RC frame structure as recited in claim 2 or 3, wherein: the inclined angle of the inclined buckling restrained brace is 35-55 degrees.
5. The reinforcement structure for improving the earthquake-resistant performance of an earthquake damage RC frame structure of claim 4, wherein: and a connecting plate is arranged on the frame beam or at the connecting part of the beam column joint and the buckling restrained supporting rod.
6. The reinforcement structure for improving the seismic performance of a seismic damage RC frame structure of claim 5, wherein: and the connecting plate is fixedly connected with the frame beam and the beam column node through expansion type bolts.
7. The reinforcement structure for improving the seismic performance of a seismic damage RC frame structure of claim 5, wherein: the buckling restrained brace is characterized in that a splice plate is arranged between the connecting plate and the buckling restrained brace, one end of the splice plate is fixedly connected with the buckling restrained brace through a high-strength bolt, and the other end of the splice plate is connected with the connecting plate through a high-strength bolt, welded or hinged.
8. A construction method for improving the earthquake-resistant performance of an earthquake-damaged RC frame structure, which adopts the reinforcement structure for improving the earthquake-resistant performance of an earthquake-damaged RC frame structure as claimed in claim 7, and is characterized by comprising the following steps:
the method comprises the following steps: chiseling out concrete in the core area of the earthquake damage RC frame node and broken concrete in the plastic hinge area;
step two: cleaning the concrete surface of the chiseling area by using a bristle brush, and simultaneously washing the surface by using tap water;
step three: the method comprises the following steps of (1) supporting a formwork in a concrete chiseling area, installing a pre-buried connecting plate, pouring a prepared cement-based composite material without coarse aggregate into the chiseling area after cement paste is brushed on the surface of the chiseling area, maintaining, and fixing the pre-buried connecting plate with frame beams and beam column nodes respectively into a whole through expansion bolts after maintenance is finished;
step four: and a buckling restrained brace is arranged between adjacent frame beams on a weak layer of the beam-column joint shock loss, one end of the splicing plate is connected with the buckling restrained brace through a high-strength bolt, and the other end of the splicing plate is fixedly connected with the connecting plate through the high-strength bolt in a welding or riveting mode.
9. The construction method for improving the earthquake-resistant performance of the earthquake damage RC frame structure of claim 8, wherein: in the third step, the cement-based composite material without the coarse aggregate, which is at least two strength grades higher than the original structural concrete, is adopted; in the third step, a maintenance scheme is formulated according to the field environment, watering is carried out in time during the maintenance period to prevent the occurrence of shrinkage cracks, watering is carried out for more than four times every day in the first 7 days, and the maintenance time is not less than 14 days.
10. The construction method for improving the earthquake-resistant performance of the earthquake damage RC frame structure of claim 8, wherein: in the fifth step, if a single support is arranged on the buckling restrained brace, the angle range between the support and the frame beam is required to be 35-55 degrees; if the buckling restrained brace is provided with two braces, one end of each buckling restrained brace is connected with the middle part of one frame beam, the other end of each buckling restrained brace is connected with the other frame beam, the other frame column and a beam column node on the same side of the frame column to form a V-shaped or inverted V-shaped brace structure, the angle range of the braces and the frame beams is required to be within the range of 35-55 degrees, and the braces and the frame beams form a reliable whole with the structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011075261.1A CN112096115A (en) | 2020-10-10 | 2020-10-10 | Reinforcing structure for improving earthquake-proof performance of earthquake-damaged RC frame structure and construction method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011075261.1A CN112096115A (en) | 2020-10-10 | 2020-10-10 | Reinforcing structure for improving earthquake-proof performance of earthquake-damaged RC frame structure and construction method |
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| CN112096115A true CN112096115A (en) | 2020-12-18 |
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| CN202011075261.1A Pending CN112096115A (en) | 2020-10-10 | 2020-10-10 | Reinforcing structure for improving earthquake-proof performance of earthquake-damaged RC frame structure and construction method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113737978A (en) * | 2021-09-22 | 2021-12-03 | 青岛理工大学 | Support type damping connecting device and pin frame of frame middle part node |
| CN114809345A (en) * | 2022-04-14 | 2022-07-29 | 重庆交通大学 | Shock insulation support for building engineering |
-
2020
- 2020-10-10 CN CN202011075261.1A patent/CN112096115A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113737978A (en) * | 2021-09-22 | 2021-12-03 | 青岛理工大学 | Support type damping connecting device and pin frame of frame middle part node |
| CN114809345A (en) * | 2022-04-14 | 2022-07-29 | 重庆交通大学 | Shock insulation support for building engineering |
| CN114809345B (en) * | 2022-04-14 | 2024-01-09 | 重庆交通大学 | Shock insulation support for building engineering |
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