CN115198968A - Steel pipe internally-constrained reinforced concrete composite column and construction method - Google Patents
Steel pipe internally-constrained reinforced concrete composite column and construction method Download PDFInfo
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- CN115198968A CN115198968A CN202210831894.3A CN202210831894A CN115198968A CN 115198968 A CN115198968 A CN 115198968A CN 202210831894 A CN202210831894 A CN 202210831894A CN 115198968 A CN115198968 A CN 115198968A
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- steel pipe
- steel
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- reinforced concrete
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 164
- 239000010959 steel Substances 0.000 title claims abstract description 164
- 239000002131 composite material Substances 0.000 title claims abstract description 28
- 239000011150 reinforced concrete Substances 0.000 title claims abstract description 28
- 238000010276 construction Methods 0.000 title claims abstract description 10
- 239000011374 ultra-high-performance concrete Substances 0.000 claims abstract description 36
- 239000004567 concrete Substances 0.000 claims abstract description 33
- 230000002787 reinforcement Effects 0.000 claims description 9
- 239000011229 interlayer Substances 0.000 claims description 5
- 239000010410 layer Substances 0.000 claims description 5
- 238000009415 formwork Methods 0.000 claims description 3
- 230000007547 defect Effects 0.000 abstract description 6
- 239000007787 solid Substances 0.000 abstract description 6
- 238000000034 method Methods 0.000 description 6
- 230000003014 reinforcing effect Effects 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000556 factor analysis Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/30—Columns; Pillars; Struts
- E04C3/34—Columns; Pillars; Struts of concrete other stone-like material, with or without permanent form elements, with or without internal or external reinforcement, e.g. metal coverings
-
- 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
- E04C5/0604—Prismatic or cylindrical reinforcement cages composed of longitudinal bars and open or closed stirrup rods
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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
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Rod-Shaped Construction Members (AREA)
Abstract
The invention discloses a reinforced concrete composite column constrained in a steel pipe and a construction method, and belongs to the field of building structures. The invention adopts the small-diameter steel pipe to replace the longitudinal steel bar, and when the cross sections of the steel pipe and the solid steel bar are the same, the steel pipe has higher area second moment and turning radius than the solid steel bar. The steel pipe is used for replacing all or part of longitudinal steel bars, so that the steel bars can be reduced from integral buckling, and the mixed steel bars in the combined column overcome the defect that the conventional steel bars are not tensile and compressive. On the other hand, the steel pipe is adopted to restrain the ultra-high performance concrete, the wall of the steel pipe plays a role in annular restraint on the concrete, the bearing capacity of the combined column is remarkably improved, and the cross section area of the column is reduced. The invention overcomes the defects of integral buckling and insufficient bearing capacity of the steel bar in the common reinforced concrete column, obviously improves the bearing capacity and the ductility of the member, can achieve higher bearing capacity and smaller section area under the condition of the same steel content, and creates larger building use space.
Description
Technical Field
The invention belongs to the field of building structures, and particularly relates to a reinforced concrete composite column constrained in a steel pipe and a construction method.
Background
The reinforced concrete post is the most basic bearing member among the engineering structure, and current concrete post bearing capacity is generally relatively poor, and the reinforcing bar takes place whole bucking easily during the earthquake. When the problems are improved by adopting methods such as increasing the cross-sectional area or changing the transverse stirrup form, the self weight is increased; the complicated transverse stirrup can limit the buckling of the steel bars, but causes great difficulty in construction.
The performance of concrete columns can be greatly improved by using composite materials, such as steel tube concrete. Section steel and concrete have been used to construct composite columns having different cross-sectional requirements, and the synergy between the two has also improved the various properties of the column. Composite columns have better performance and are used in many structures than conventional columns reinforced with steel reinforcement.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a reinforced concrete composite column restrained in a steel pipe and a construction method.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a reinforced concrete combined column restrained in a steel tube comprises a common concrete column body, wherein a plurality of steel tubes with the same height as the common concrete column body are arranged in the common concrete column body, and the steel tubes are arranged close to the edge of the common concrete column body; a plurality of transverse stirrups are arranged on the peripheries of all the steel pipes, and the transverse stirrups are arranged at different heights of the steel pipes;
the steel pipe is internally filled with an ultrahigh-performance concrete interlayer.
Furthermore, the top of the ultra-high performance concrete interlayer is flush with the top of the steel pipe.
Furthermore, longitudinal steel bars are arranged inside the common concrete column body, and the longitudinal steel bars and the steel pipes are distributed alternately.
Further, the diameter of the steel pipe is not more than 100mm.
Further, the steel pipe is square steel pipe.
Further, the steel pipe is a circular steel pipe.
Further, the ultra-high performance concrete interlayer is made of UHPC ultra-high performance concrete.
A construction method of a reinforced concrete composite column restrained in a steel pipe comprises the following steps:
(1) Vertically arranging the steel pipes, filling the steel pipes with ultra-high performance concrete, leveling the steel pipes and the ultra-high performance concrete at the port, maintaining, and prefabricating a reinforced longitudinal mixed steel bar assembly;
(2) Binding a reinforced longitudinal mixed steel bar assembly consisting of the steel pipe and the ultra-high performance concrete with the transverse stirrups to form a steel reinforcement cage, and erecting a formwork;
(3) And pouring common concrete.
Compared with the prior art, the invention has the following beneficial effects:
according to the reinforced concrete combination column constrained in the steel pipe and the construction method, the small-diameter steel pipe is adopted to replace the longitudinal steel bar, and when the cross sections of the steel pipe and the solid steel bar are the same, the steel pipe has a higher area second moment and a higher turning radius than the solid steel bar. The steel pipe is used for replacing all or part of longitudinal steel bars, so that the integral buckling of the steel bars can be reduced, and the mixed steel bars in the combined column overcome the defects of tensile strength and non-compressive strength of the conventional steel bars. On the other hand, the steel pipe is adopted to restrain the ultrahigh-performance concrete, the steel pipe wall plays a role in annular restraint on the concrete, the bearing capacity of the combined column is obviously improved, and the cross-sectional area of the column is reduced. Meanwhile, the ultra-high performance concrete is used for filling the small-diameter steel pipe, so that the yield strength, the ultimate strength and the ductility of the combined column under the action of the axial load can be further improved. The invention overcomes the defects of integral buckling and insufficient bearing capacity of the steel bar in the common reinforced concrete column, obviously improves the bearing capacity and the ductility of the member, can achieve higher bearing capacity and smaller section area under the condition of the same steel content, and creates larger building use space.
Drawings
FIG. 1 is a schematic cross-sectional view of a composite column structure of mixed rebar;
FIG. 2 is a perspective view of a composite column of mixed steel bars;
FIG. 3 is a schematic view of the arrangement of hybrid steel bars and transverse stirrups in the composite column of hybrid steel bars;
FIG. 4 is a schematic cross-sectional view of an assembled column using a combination of hybrid and conventional rebars;
FIG. 5 is a schematic perspective view of a combined column used in combination with a hybrid steel bar and a normal steel bar;
FIG. 6 is a schematic view showing the arrangement of hybrid steel bars and transverse stirrups in a composite column using the hybrid steel bars and ordinary steel bars in combination;
fig. 7 is a schematic view showing a structure of a reinforcing bar assembly, fig. 7 (a) is a schematic view showing a circular reinforcing longitudinal bar assembly, and fig. 7 (b) is a schematic view showing a square reinforcing longitudinal bar assembly;
FIG. 8 is an axial load-displacement curve of the composite column of the present invention after finite element analysis of a common steel reinforced concrete column of the same steel content.
In the figure: 1 is a steel pipe, 2 is an ultrahigh-performance concrete interlayer, 3 is a common concrete column, 4 is a transverse stirrup, and 5 is a longitudinal steel bar.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Moreover, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention is described in further detail below with reference to the accompanying drawings:
the invention includes two reinforcement modes, and the mixed reinforcement assembly is used for replacing all longitudinal reinforcements or replacing part of the longitudinal reinforcements. Example 1 is a form in which all hybrid rebar assemblies are used, and example 2 is a form in which hybrid rebar and longitudinal rebar are combined, as follows:
example 1
Referring to fig. 1, 2 and 3, fig. 1 and 2 are a schematic structural cross-sectional view and a schematic perspective structural view of a reinforced concrete composite column restrained in a steel pipe, and fig. 3 is a schematic binding view of a hybrid reinforcement and a transverse stirrup of the reinforced concrete composite column restrained in a steel pipe; a steel pipe internally-constrained reinforced concrete combined column comprises a common concrete column body 3, wherein a plurality of steel pipes 1 with the same height are arranged inside the common concrete column body 3, the top of each steel pipe 1 is flush with the top of the common concrete column body 3, and the steel pipes 1 are arranged close to the edge of the common concrete column body 3; the steel pipe 1 is filled with the ultra-high performance concrete intermediate layer 2, and the top of ultra-high performance concrete intermediate layer 2 and the top of steel pipe 1 flush, are equipped with a plurality of horizontal stirrups 4 in the periphery of steel pipe 1.
The diameter of the steel pipe is not more than 100mm, the internal filler is filled with high-fluidity materials such as ultra-high performance concrete, and the ultra-high performance concrete is easy to generate brittle failure when bearing longitudinal load. The transverse deformation of the ultra-high performance concrete is inhibited under the constraint of the steel pipe 2, the strength and the ductility are greatly improved, and the characteristic that the ultra-high performance concrete is easy to be subjected to brittle failure is overcome.
The steel pipe filled with the ultra-high performance concrete is used as the steel bar, so that the defect of integral buckling of the steel bar of the common reinforced concrete column is overcome, and the ductility of the column is improved.
The UHPC ultra-high performance concrete is a special engineering material with ultra-high strength, toughness and high durability, and has good application prospect in the fields of national defense engineering, ocean engineering, nuclear industry, special security and protection engineering and municipal engineering. The test proves that the flexural strength of the concrete is 3 times of that of common concrete C50 concrete, and the shrinkage change is reduced by 50 percent.
Referring to fig. 7, fig. 7 (a) is a schematic view of a circular reinforced longitudinal bar assembly, and fig. 7 (b) is a schematic view of a square reinforced longitudinal bar assembly; the steel pipe 1 can be a round steel pipe or a square steel pipe; the circular steel pipe can provide better restraint, can realize circumferential uniform restraint, and improves the strength and ductility of the core ultrahigh-performance concrete; and the square steel pipe has smaller cross-sectional area and steel consumption. In general, both cross-sectional forms can increase the load-bearing capacity of the composite column and reduce the cross-sectional dimension of the composite column. The wall thickness and the diameter of the steel pipe are changed, so that the requirements of the combined columns with different sizes and the steel content are met. Filling these steel pipes with ultra-high performance concrete can further increase the yield strength and ductility of the composite column under axial load. This is because the concrete fill helps to delay local buckling and to shift the failure mode of the steel pipe wall from inward to outward.
Example 2
Referring to fig. 4, 5 and 6, fig. 4 is a schematic cross-sectional view of a combined column in which a mixed steel bar and a general steel bar are combined, fig. 5 is a schematic perspective view of a combined column in which a mixed steel bar and a general steel bar are combined, and fig. 6 is a schematic binding view of a mixed steel bar and a transverse stirrup of a combined column in which a mixed steel bar and a general steel bar are combined; a reinforced concrete combination column constrained in a steel pipe comprises a common concrete column body 3, wherein a plurality of steel pipes 1 and longitudinal steel bars 5 are arranged inside the common concrete column body 3, the tops of the steel pipes 1 and the longitudinal steel bars 5 are flush with the top of the common concrete column body 3, and the steel pipes 1 are arranged close to the edge of the common concrete column body 3; the steel pipes 1 and the longitudinal steel bars 5 are alternately arranged; the steel pipe 1 is filled with the ultra-high performance concrete intermediate layer 2, and the top of the ultra-high performance concrete intermediate layer 2 is level with the top of the steel pipe 1, is equipped with a plurality of horizontal stirrups 4 in the steel pipe 1 periphery.
In further embodiments, the composite column of the present invention may have any one of a square, circular or profiled column in cross-sectional form.
In another embodiment, only one steel pipe restraining member may be disposed at the center as necessary, but the thickness and diameter of the steel pipe may be increased as appropriate in order to secure the steel content.
Referring to fig. 8, fig. 8 is a view showing axial load-displacement curves of the combined column of the present invention and a general reinforced concrete column of the same size and steel content by using a finite element method, the sectional area of the steel tube 1 is the same as that of the solid steel bar by designing the member, the same steel content is ensured, the single factor analysis is performed, and the axial compression performance of the combined column after the solid steel bar is replaced by the reinforced longitudinal mixed steel bar assembly is analyzed. The numerical simulation result shows that the ultimate bearing capacity of the combined column is about 4 times of that of a common concrete column, and the bearing capacity of the combined column rises to some extent in the later loading stage due to the constraint effect of the steel pipe 1, even the situation of secondary peak occurs. Finally, the ductility of the combined column is obviously superior to that of a common reinforced concrete column, and the combined column has a good ductility coefficient.
A construction method of a reinforced concrete composite column restrained in a steel pipe comprises the following steps:
vertically arranging a steel pipe 1, filling ultrahigh-performance concrete 2 in the steel pipe 1, leveling the steel pipe 1 and the ultrahigh-performance concrete 2 at the port, maintaining, and prefabricating a reinforced longitudinal mixed steel bar assembly;
binding a reinforced longitudinal mixed steel bar assembly consisting of the steel pipe 1 and the ultra-high performance concrete 2 with the transverse stirrups 4 to form a steel reinforcement cage, and erecting a formwork;
and pouring common concrete.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (8)
1. The reinforced concrete combination column constrained in the steel pipe is characterized by comprising a common concrete column body (3), wherein a plurality of steel pipes (1) with the same height as the common concrete column body (3) are arranged in the common concrete column body (3), and the steel pipes (1) are arranged close to the edge of the common concrete column body (3); the periphery of all the steel pipes (1) is provided with a plurality of transverse stirrups (4), and the transverse stirrups (4) are arranged at different heights of the steel pipes (1);
the steel pipe (1) is filled with an ultrahigh-performance concrete interlayer (2).
2. The steel pipe internally restrained reinforced concrete composite column according to claim 1, wherein the top of the ultra high performance concrete sandwich layer (2) and the top of the steel pipe (1) are flush.
3. The steel pipe internally restrained reinforced concrete composite column according to claim 1, wherein longitudinal steel bars (5) are provided inside the general concrete column body (3), and the longitudinal steel bars (5) and the steel pipes (1) are alternately distributed.
4. An internally restrained reinforced concrete composite column according to any one of claims 1-3, wherein the steel pipes (1) have a diameter of not more than 100mm.
5. The steel pipe internally restrained reinforced concrete composite column according to any one of claims 1 to 3, wherein the steel pipe (1) is a square steel pipe.
6. The steel pipe internally restrained reinforced concrete composite column according to any one of claims 1 to 3, wherein the steel pipe (1) is a circular steel pipe.
7. The steel pipe internally restrained reinforced concrete composite column according to claim 1, wherein said ultra high performance concrete sandwich (2) is made of UHPC ultra high performance concrete.
8. A construction method of a reinforced concrete composite column restrained in a steel pipe is characterized by comprising the following steps:
(1) Vertically arranging a steel pipe (1), filling ultrahigh-performance concrete (2) in the steel pipe (1), leveling the steel pipe (1) and the ultrahigh-performance concrete (2) at the port, maintaining and prefabricating a reinforced longitudinal mixed steel bar assembly;
(2) Binding a reinforced longitudinal mixed steel bar assembly consisting of the steel pipe (1) and the ultra-high performance concrete (2) with the transverse stirrups (4) to form a steel reinforcement cage and supporting a formwork;
(3) And pouring common concrete.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210831894.3A CN115198968A (en) | 2022-07-15 | 2022-07-15 | Steel pipe internally-constrained reinforced concrete composite column and construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210831894.3A CN115198968A (en) | 2022-07-15 | 2022-07-15 | Steel pipe internally-constrained reinforced concrete composite column and construction method |
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| Publication Number | Publication Date |
|---|---|
| CN115198968A true CN115198968A (en) | 2022-10-18 |
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| CN202210831894.3A Pending CN115198968A (en) | 2022-07-15 | 2022-07-15 | Steel pipe internally-constrained reinforced concrete composite column and construction method |
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Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09111721A (en) * | 1995-10-13 | 1997-04-28 | Nkk Corp | Execution method and structure of bridge pier |
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| CN203066356U (en) * | 2013-03-07 | 2013-07-17 | 重庆大学 | Reinforced concrete column with local buckling constraint of longitudinal bars |
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| CN105064613A (en) * | 2015-09-06 | 2015-11-18 | 南京工业大学 | Built-in FRP locally restrained concrete combined member |
| CN205577260U (en) * | 2016-02-29 | 2016-09-14 | 国核电力规划设计研究院 | Concrete column |
| CN207062746U (en) * | 2017-07-24 | 2018-03-02 | 青岛春旭钢结构有限公司 | The precast pier of steel pipe built in a kind of band |
| CN207934335U (en) * | 2018-02-08 | 2018-10-02 | 沈阳建筑大学 | Combine fine steel tube-concrete column structure |
| KR20200121017A (en) * | 2019-04-15 | 2020-10-23 | 세인테크 주식회사 | pipe for structure |
| US20200392732A1 (en) * | 2019-06-17 | 2020-12-17 | North China University Of Science And Technology | Connection structure, concrete-encased concrete-filled steel tube column and construction method |
| CN216690087U (en) * | 2021-12-20 | 2022-06-07 | 上海模卡建筑工程科技发展有限公司 | Core column is irritated to bellows through-hole |
| CN217711379U (en) * | 2022-07-15 | 2022-11-01 | 西安建筑科技大学 | Reinforced concrete combination column restrained in steel pipe |
-
2022
- 2022-07-15 CN CN202210831894.3A patent/CN115198968A/en active Pending
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09111721A (en) * | 1995-10-13 | 1997-04-28 | Nkk Corp | Execution method and structure of bridge pier |
| CN201671226U (en) * | 2010-05-25 | 2010-12-15 | 西安建筑科技大学 | Expanded flanged cross-shaped steel SRC column |
| CN203066356U (en) * | 2013-03-07 | 2013-07-17 | 重庆大学 | Reinforced concrete column with local buckling constraint of longitudinal bars |
| CN104594561A (en) * | 2014-12-22 | 2015-05-06 | 西安建筑科技大学 | Prefabricated reinforced concrete column with high-performance concrete frame and construction method |
| CN105064613A (en) * | 2015-09-06 | 2015-11-18 | 南京工业大学 | Built-in FRP locally restrained concrete combined member |
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| CN207062746U (en) * | 2017-07-24 | 2018-03-02 | 青岛春旭钢结构有限公司 | The precast pier of steel pipe built in a kind of band |
| CN207934335U (en) * | 2018-02-08 | 2018-10-02 | 沈阳建筑大学 | Combine fine steel tube-concrete column structure |
| KR20200121017A (en) * | 2019-04-15 | 2020-10-23 | 세인테크 주식회사 | pipe for structure |
| US20200392732A1 (en) * | 2019-06-17 | 2020-12-17 | North China University Of Science And Technology | Connection structure, concrete-encased concrete-filled steel tube column and construction method |
| CN216690087U (en) * | 2021-12-20 | 2022-06-07 | 上海模卡建筑工程科技发展有限公司 | Core column is irritated to bellows through-hole |
| CN217711379U (en) * | 2022-07-15 | 2022-11-01 | 西安建筑科技大学 | Reinforced concrete combination column restrained in steel pipe |
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