CN116104252A - Superposed stirrup and method for improving ductility of frame column - Google Patents
Superposed stirrup and method for improving ductility of frame column Download PDFInfo
- Publication number
- CN116104252A CN116104252A CN202310128510.6A CN202310128510A CN116104252A CN 116104252 A CN116104252 A CN 116104252A CN 202310128510 A CN202310128510 A CN 202310128510A CN 116104252 A CN116104252 A CN 116104252A
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- China
- Prior art keywords
- stirrup
- frame column
- ductility
- closed
- laminated
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000007789 sealing Methods 0.000 claims abstract description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 238000005452 bending Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 5
- 239000004567 concrete Substances 0.000 abstract description 4
- 238000010276 construction Methods 0.000 abstract description 3
- 238000010008 shearing Methods 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
- E04C5/06—Reinforcing elements of metal, e.g. with non-structural coatings of high bending resistance, i.e. of essentially three-dimensional extent, e.g. lattice girders
- E04C5/0636—Three-dimensional reinforcing mats composed of reinforcing elements laying in two or more parallel planes and connected by separate reinforcing parts
-
- 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
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/12—Mounting of reinforcing inserts; Prestressing
-
- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Reinforcement Elements For Buildings (AREA)
Abstract
The invention discloses a laminated stirrup and a method for improving ductility of a frame column; an additional sealing stirrup is added in parallel on the adjacent side of the first sealing stirrup of the stirrup in the encryption area of the frame column; the hook position of the additional closed stirrup is arranged diagonally to the hook position of the first closed stirrup; binding and overlapping the two to form a laminated stirrup structure; only the first stirrup next to the end of the frame column is needed, an additional closing stirrup is placed to form a superimposed stirrup, the direction of placement of the additional closing stirrup being such that the hooks of the two stirrups are in opposite positions. The construction process is simple and convenient. After the first stirrup at the end of the frame column becomes the superimposed stirrup, the superimposed stirrup does not form a weak point at the hooks like a single stirrup. Under the action of load, the hook of the first overlapped stirrup with the greatest stress at the end part of the frame column is not easy to be separated, the transverse constraint effect of the closed stirrup on the longitudinal bars and the concrete is fully exerted, and the ductility and the earthquake resistance of the frame column are improved.
Description
The application is a divisional application of an invention patent with the parent case name of 'a laminated stirrup and a method for improving ductility of a frame column'; the application number of the parent application is: CN201710508759.4; the application date of the parent application is: 2017.06.28.
Technical Field
The invention relates to a frame column of a building structure, in particular to a superposed stirrup and a method for improving ductility of the frame column.
Background
The frame structure has the characteristics of flexible planar arrangement and large space provision, and is widely applied to buildings such as malls, houses, school teaching buildings and the like. The frame column is used as a key stress member of the frame structure, and the anti-seismic performance of the frame structure is directly influenced by the anti-seismic performance of the frame column. Under the action of load, the end part of the frame column is stressed in a complex manner, and simultaneously is subjected to the combined action of larger bending moment, shearing force and axial force. The end part of the traditional reinforced concrete frame column is provided with an encryption sealing stirrup to bear shearing force, and the encryption sealing stirrup and the stressed longitudinal bar form the reinforced skeleton confined concrete. In order to ensure the effective function of the stirrup, current regulations require that the closing stirrup be provided with 135 ° hooks at the joints, which hooks also have a certain length. However, in practical engineering and experiments, it has been found that even if the current specification requirements are met, the first stirrup at the end of the frame column is prone to the hook disengaging under load and losing the effect of the closed stirrup. At this time, not only the sheared bearing capacity of the frame column is reduced, but also the bearing capacity of the frame column is reduced rapidly because the effective constraint function of the stirrups is lost, the stressed longitudinal ribs are more easily pressed and bent into a lantern shape, and the concrete is more easily crushed. The restraint failure of the first closed stirrup at the end of the frame column not only leads to the reduction of the bearing capacity of the frame column and easy damage, but also does not reach the expected anti-seismic design level.
Disclosure of Invention
In order to solve the problem that a first stirrup at the end part of a frame column is restrained and disabled due to the uncoupling of a hook, the invention provides a superposed stirrup and a method for improving the ductility of the frame column. Only one closed stirrup needs to be added on the basis of the existing structure to form a superposed stirrup, the construction mode is simple, the problem that the first stirrup at the end part of the frame column is restrained and invalid due to the uncoupling of the hooks can be effectively solved, the effect of the closed stirrup is fully exerted, and the ductility and the shock resistance of the frame column are improved.
The invention is realized by the following technical scheme:
the invention provides a laminated stirrup for improving ductility of a frame column, which comprises the frame column, a frame beam and a first closed stirrup positioned at the end part of the frame column, wherein an additional closed stirrup is added in parallel on the adjacent side of the first closed stirrup of the stirrup in an encryption area of the frame column;
the hook position of the additional closed stirrup is arranged diagonally to the hook position of the first closed stirrup; and the additional closed stirrup and the first closed stirrup are bound and overlapped together to form an overlapped stirrup structure.
Preferably, the laminated stirrup structure is placed at a distance of 50-55 mm from the end of the frame column.
Preferably, the hook angle of the ends of the first and the additional closing stirrups is not less than 135 °, or not less than 138 °.
Preferably, the length of the bent straight section of the additional closed stirrup is more than or equal to 9-10 times of the diameter of the adopted steel bar;
or the length of the straight section of the hook of the first closed stirrup is more than or equal to 75mm or more than or equal to 80mm.
The invention also provides a method for improving the ductility of the frame column, which is realized by adopting the laminated stirrup for improving the ductility of the frame column, and comprises the following steps:
bending the two ends of the first closed stirrup and the two ends of the additional closed stirrup to form a hook;
then, the hook position of the additional closed stirrup and the hook position of the first closed stirrup are arranged diagonally; and binding and overlapping the two materials together to form a laminated stirrup structure, and placing the laminated stirrup structure at the corresponding position of the frame column, so that the laminated stirrup structure and the frame column are used as a first stirrup together, and the ductility of the frame column is improved.
Preferably, the angle of the bent hook is more than or equal to 138 degrees, and the length of the bent straight section is more than or equal to 9 times or 10 times of the diameter of the adopted steel bar.
Preferably, the laminated stirrup structure is placed 55mm from the end of the frame column.
Compared with the prior art, the invention has the following advantages and effects:
according to the laminated stirrup and the method for improving the ductility of the frame column, only the first stirrup which is close to the end part of the frame column is needed, one additional closed stirrup is placed to form the laminated stirrup, and the placement direction of the additional closed stirrup is such that hooks of the two stirrups are in opposite positions. The construction process is simple and convenient. After the first stirrup at the end of the frame column becomes the superimposed stirrup, the superimposed stirrup does not form a weak point at the hooks like a single stirrup. Under the action of load, the hook of the first overlapped stirrup with the greatest stress at the end part of the frame column is not easy to be separated, the transverse constraint effect of the closed stirrup on the longitudinal bars and the concrete is fully exerted, and the ductility and the earthquake resistance of the frame column are improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a laminated stirrup of the present invention for improving the ductility of a frame column;
FIG. 2 is a schematic view of section A-A of FIG. 1;
FIG. 3 is a schematic view of a first closure stirrup in combination with an additional closure stirrup.
In the figure: 1-frame columns; 2-frame beams; 3-floor slab; 4-a frame column longitudinal rib; 5-frame column non-encryption area stirrups; 6-hooping in an encrypted area; 7-attaching a closed stirrup; 8-first closed stirrup.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Examples
As shown in fig. 1 to 3, the invention discloses a laminated stirrup for improving the ductility of a frame column, which comprises a frame column 1, a frame beam 2 and a first closed stirrup 8 positioned at the end part of the frame column 1; an additional sealing stirrup 7 is added in parallel to the adjacent side of the first sealing stirrup 8 of the stirrup 6 in the encryption zone of the frame column 1;
the hook position of the additional closing stirrup 7 is diagonally arranged with the hook position of the first closing stirrup 8; binding and overlapping the two to form a laminated stirrup structure;
the overlapped stirrup structure is placed at a position 50-55 mm away from the end part of the frame column 1.
The hook angle of the tail ends of the first closing stirrup 8 and the additional closing stirrup 7 is more than or equal to 135 degrees or more than or equal to 138 degrees.
The length of the bent hook straight section of the additional closed stirrup 7 and the first closed stirrup 8 is more than or equal to 9-10 times of the diameter of the adopted steel bar;
or the length of the straight section of the hook of the first closing stirrup 8 is more than or equal to 75mm or more than or equal to 80mm.
A method of improving ductility of a frame column comprising the steps of:
bending the two tail ends of the first closed stirrup 8 and the two tail ends of the additional closed stirrup 7 respectively, wherein the bent hook angle is more than or equal to 138 degrees, and the length of the bent straight section is more than or equal to 9 times or 10 times of the diameter of the adopted reinforcing steel bar;
then the hook position of the additional closed stirrup 7 is arranged diagonally to the hook position of the first closed stirrup 8; and the two stirrups are bound and overlapped together to form a laminated stirrup structure and placed at the position 55mm away from the end part of the frame column 1, so that the two stirrups are used as the first stirrup together, and the ductility of the frame column 1 is further improved. And then binding the steel bars continuously according to the requirements of the design drawing.
As described above, the present invention can be preferably realized.
The principles and embodiments of the present invention have been described in detail with reference to specific examples, which are provided to facilitate understanding of the method and core ideas of the present invention; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (7)
1. The utility model provides an improve coincide stirrup of frame post ductility, includes frame post (1), frame roof beam (2) and is located first closed stirrup (8) of frame post (1) tip, its characterized in that: an additional sealing stirrup (7) is added in parallel to the adjacent side of the first sealing stirrup (8) of the stirrup (6) in the encryption area of the frame column (1);
the hook position of the additional closed stirrup (7) and the hook position of the first closed stirrup (8) are arranged diagonally; the additional closed stirrup (7) and the first closed stirrup (8) are bound and overlapped together to form an overlapped stirrup structure.
2. The laminated stirrup for improving the ductility of a frame column according to claim 1, wherein: the overlapped stirrup structure is placed at a position 50-55 mm away from the end part of the frame column (1).
3. The laminated stirrup for improving the ductility of a frame column according to claim 1, wherein: the hook angle of the tail ends of the first closed stirrup (8) and the additional closed stirrup (7) is more than or equal to 135 degrees or more than or equal to 138 degrees.
4. The laminated stirrup for improving the ductility of a frame column according to claim 1, wherein: the length of the bent hook straight section of the additional closed stirrup (7) and the first closed stirrup (8) is more than or equal to 9-10 times of the diameter of the adopted steel bar;
or the length of the straight section of the hook of the additional closed stirrup (7) and the first closed stirrup (8) is more than or equal to 75mm or more than or equal to 80mm.
5. A method for improving ductility of a frame column, comprising the steps of: the realization of the laminated stirrup for improving the ductility of the frame column according to any one of claims 1 to 5, comprising the following steps:
bending the two ends of the first closed stirrup (8) and the two ends of the additional closed stirrup (7) to form a hook;
then, the hook position of the additional closed stirrup (7) and the hook position of the first closed stirrup (8) are arranged diagonally; and binding and overlapping the two materials together to form a laminated stirrup structure, and placing the laminated stirrup structure at the corresponding position of the frame column (1), so that the laminated stirrup structure and the frame column are used as a first stirrup together, and the ductility of the frame column (1) is improved.
6. A method of improving frame column ductility according to claim 5, wherein: the angle of the bent hook is more than or equal to 138 degrees, and the length of the bent straight section is more than or equal to 9 times or 10 times of the diameter of the adopted steel bar.
7. A method of improving frame column ductility according to claim 5, wherein: the laminated stirrup structure is placed 55mm from the end of the frame column (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310128510.6A CN116104252A (en) | 2017-06-28 | 2017-06-28 | Superposed stirrup and method for improving ductility of frame column |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310128510.6A CN116104252A (en) | 2017-06-28 | 2017-06-28 | Superposed stirrup and method for improving ductility of frame column |
| CN201710508759.4A CN107299724A (en) | 2017-06-28 | 2017-06-28 | A kind of overlapping stirrup and method for improving frame column ductility |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710508759.4A Division CN107299724A (en) | 2017-06-28 | 2017-06-28 | A kind of overlapping stirrup and method for improving frame column ductility |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116104252A true CN116104252A (en) | 2023-05-12 |
Family
ID=60135176
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310128510.6A Pending CN116104252A (en) | 2017-06-28 | 2017-06-28 | Superposed stirrup and method for improving ductility of frame column |
| CN201710508759.4A Pending CN107299724A (en) | 2017-06-28 | 2017-06-28 | A kind of overlapping stirrup and method for improving frame column ductility |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710508759.4A Pending CN107299724A (en) | 2017-06-28 | 2017-06-28 | A kind of overlapping stirrup and method for improving frame column ductility |
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| Country | Link |
|---|---|
| CN (2) | CN116104252A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113202310B (en) * | 2021-05-06 | 2023-07-04 | 王权民 | Light-support attached formwork construction process |
| CN114232812A (en) * | 2021-12-29 | 2022-03-25 | 中铁建设集团有限公司 | Unequal strength wall beam joint based on steel plate hoop constrained concrete superposed short column |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03123019U (en) * | 1990-03-27 | 1991-12-16 | ||
| CN203160515U (en) * | 2013-04-19 | 2013-08-28 | 中国五冶集团有限公司 | Bi-directionally opening and counter pulling stirrup |
| CN104863268A (en) * | 2015-05-27 | 2015-08-26 | 浙江工业大学 | PC steel rod reinforcing method for improving anti-seismic property of special-shaped column joint |
| CN205712741U (en) * | 2016-04-29 | 2016-11-23 | 戴云发 | The confinement hooping structure of strengthening cylinder and the rod structure of strengthening |
| JP3208485U (en) * | 2016-03-31 | 2017-01-12 | 戴 雲 發 | Stirrup structure |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103590496A (en) * | 2013-11-01 | 2014-02-19 | 广西建工集团第五建筑工程有限责任公司 | Beam and column joint stirrup framework and method for installing beam and column joint steel bars by using same |
| CN104963416A (en) * | 2015-06-18 | 2015-10-07 | 长安大学 | Steel-reinforced concrete column constrained by circular steel tube and reinforced concrete beam node structure |
-
2017
- 2017-06-28 CN CN202310128510.6A patent/CN116104252A/en active Pending
- 2017-06-28 CN CN201710508759.4A patent/CN107299724A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03123019U (en) * | 1990-03-27 | 1991-12-16 | ||
| CN203160515U (en) * | 2013-04-19 | 2013-08-28 | 中国五冶集团有限公司 | Bi-directionally opening and counter pulling stirrup |
| CN104863268A (en) * | 2015-05-27 | 2015-08-26 | 浙江工业大学 | PC steel rod reinforcing method for improving anti-seismic property of special-shaped column joint |
| JP3208485U (en) * | 2016-03-31 | 2017-01-12 | 戴 雲 發 | Stirrup structure |
| CN205712741U (en) * | 2016-04-29 | 2016-11-23 | 戴云发 | The confinement hooping structure of strengthening cylinder and the rod structure of strengthening |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107299724A (en) | 2017-10-27 |
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