CN217811929U

CN217811929U - Reinforced concrete composite column containing mixed steel bars

Info

Publication number: CN217811929U
Application number: CN202221822558.4U
Authority: CN
Inventors: 史庆轩; 李雪梅; 王朋; 王秋维; 陶毅
Original assignee: Xian University of Architecture and Technology
Current assignee: Xian University of Architecture and Technology
Priority date: 2022-07-15
Filing date: 2022-07-15
Publication date: 2022-11-15
Anticipated expiration: 2032-07-15

Abstract

The utility model discloses a reinforced concrete combination post that contains hybrid reinforcement belongs to the building structure field. The utility model introduces the concrete combination column of the reinforced steel bar component, and the peeling and crushing actions of the ultra-high performance concrete in the corrugated steel pipe are limited; the embedded steel bar is supported by the lateral direction of the concrete in the pipe and the external corrugated steel pipe, and the buckling phenomenon is difficult to occur under the compression effect, so that the exertion of the compression bearing capacity of the steel bar and the improvement of the ductility are ensured. On the other hand, due to the corrugated shape of the inner and outer concave-convex parts of the corrugated steel pipe, a strong interlocking effect is achieved between the corrugated steel pipe and the concrete, and the pipeline is prevented from being separated from the concrete. The utility model provides an ultra high performance concrete is under the dual restraint of corrugated steel pipe and reinforcing bar, and transverse expansion deformation obtains effectual suppression, and intensity and ductility also obtain promoting by a wide margin. Utility model provides a normal reinforced concrete column longitudinal reinforcement pressurized buckling to the post inefficacy problem that leads to.

Description

Reinforced concrete composite column containing mixed steel bars

Technical Field

The utility model belongs to the building structure field, especially a reinforced concrete combination post that contains hybrid reinforcement.

Background

The concrete column is the most basic load-bearing member in the engineering structure, and the reinforced concrete structure is one of the most widely applied structural forms, and the existing reinforced concrete column has limited bearing capacity, and the demand on the bearing capacity is also continuously improved in the face of the continuous increase of the building height. Under the action of earthquake, the longitudinal steel bars of the common reinforced concrete columns are pressed and bent, and in addition, in the common reinforced concrete frame structure, the damage and failure of the columns are one of important reasons for causing the damage and collapse of the whole structure. Therefore, improving the performance of the reinforced concrete column in all aspects is one of the important links for realizing the optimization of the performance of the whole structure.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome above-mentioned prior art's shortcoming, provide a reinforced concrete combination post that contains hybrid reinforcement.

In order to achieve the above purpose, the utility model adopts the following technical scheme to realize:

a reinforced concrete composite column containing mixed steel bars comprises a common concrete column body, wherein a plurality of mixed steel bars are arranged at equal heights in the common concrete column body, the mixed steel bars are arranged at the outer edge of the common concrete column body, and a plurality of transverse stirrups are arranged at different heights on the periphery of the mixed steel bars;

the mixed steel bar is composed of an embedded steel bar, an ultra-high performance concrete interlayer and a corrugated steel pipe, the corrugated steel pipe is sleeved on the periphery of the embedded steel bar, and the ultra-high performance concrete interlayer is arranged between the embedded steel bar and the corrugated steel pipe.

Furthermore, steel bars are arranged in the common concrete column body at the same height, and the steel bars and the mixed steel bars are arranged at the outer edge of the common concrete column body.

Further, the reinforcing steel bars and the mixed reinforcing steel bars are alternately arranged.

Further, the top of embedded reinforcing bar is flushed in corrugated steel pipe.

Further, the diameter of the corrugated steel pipe is not more than 100mm.

Furthermore, the section of the common concrete column body is square, circular or special-shaped.

Furthermore, the corrugated steel pipe and the embedded steel bar are concentrically arranged.

Further, the ultra-high performance concrete interlayer is made of UHPC ultra-high performance concrete.

Compared with the prior art, the utility model discloses following beneficial effect has:

the reinforced concrete composite column containing the mixed reinforcing steel bars introduces the concrete composite column of the reinforcing steel bar assembly, and the stripping and crushing actions of the ultra-high performance concrete in the corrugated steel pipe are limited; the embedded steel bar is supported by the lateral direction of the concrete in the pipe and the external corrugated steel pipe, and the buckling phenomenon is difficult to occur under the compression effect, so that the exertion of the compression bearing capacity of the steel bar and the improvement of the ductility are ensured. On the other hand, because the corrugated steel pipe is in an inner concave-convex corrugated shape and an outer concave-convex corrugated shape, a strong interlocking effect is achieved between the corrugated steel pipe and the concrete, the pipeline and the concrete are prevented from being separated, higher compression-resistant bearing capacity can be provided, and the tensile property of the mixed steel bar can be improved through the embedded steel bar. Meanwhile, generally, when the ultrahigh-performance concrete bears a longitudinal load, the ultrahigh-performance concrete can expand and deform transversely, and brittle failure is easy to occur. The utility model provides an ultra high performance concrete is under the dual restraint of corrugated steel pipe and reinforcing bar, and transverse expansion deformation obtains effectual suppression, and intensity and ductility also obtain promoting by a wide margin. Adopt mixed reinforcing bar can also reduce the whole bucking of reinforcing bar. Specifically, adopt embedded steel bar corrugated steel pipe restraint ultrahigh performance concrete, the corrugated steel pipe wall plays the hoop restraint effect to the concrete, improves the bearing capacity and the ductility of post greatly, and corresponding can reduce cross sectional area. The utility model solves the problem of column failure caused by buckling of longitudinal steel bars of common reinforced concrete columns under pressure, and obviously improves the bearing capacity and ductility of components; and, under the same steel content, can use smaller post cross-sectional area, produce bigger building and use the space.

Furthermore, embedded steel bars in the mixed steel bars extend out of the corrugated steel pipe, so that the embedded steel bars can be conveniently connected and anchored.

Drawings

Fig. 1 is a schematic cross-sectional view of a reinforced concrete composite column with mixed reinforcing bars.

Fig. 2 is a schematic view of a three-dimensional structure of a reinforced concrete composite column of mixed steel bars.

Fig. 3 is a layout view of mixed steel bars and transverse stirrups in the reinforced concrete composite column with mixed steel bars.

FIG. 4 is a schematic cross-sectional view of a reinforced concrete composite column including mixed rebars and reinforcing steel.

Fig. 5 is a perspective view illustrating a reinforced concrete composite column including mixed reinforcing bars and reinforcing steel bars.

Fig. 6 is a layout view of reinforcing bars and transverse stirrups in a reinforced concrete composite column including mixed reinforcing bars and reinforcing bars.

Fig. 7 is a schematic structural view of a hybrid rebar, wherein fig. 7 (a) is a cross-sectional view of the hybrid rebar and fig. 7 (b) is an elevation view of the hybrid rebar.

Fig. 8 is an axial load-displacement curve of the combined column and the common reinforced concrete column with the same steel content after finite element analysis.

In the figure: 1 is built-in reinforcing steel bar, 2 is the ultra-high performance concrete intermediate layer, 3 is corrugated steel pipe, 4 is ordinary concrete column, 5 is horizontal stirrup, 6 is longitudinal reinforcement.

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 accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to 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 otherwise 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 utility model discloses a two kinds of arrangement of reinforcement modes use mixed reinforcing bar subassembly to replace all longitudinal reinforcement or replace partial longitudinal reinforcement, it is right below to combine the figure the utility model discloses do further detailed description:

example 1

Referring to fig. 1, 2 and 3, fig. 1 is a schematic cross-sectional view of a reinforced concrete composite column of mixed steel bars, fig. 2 is a schematic three-dimensional structure of a reinforced concrete composite column of mixed steel bars, and fig. 3 is a schematic view of mixed steel bars and transverse stirrups in the reinforced concrete composite column of mixed steel bars; the utility model discloses a reinforced concrete combination column of mixed reinforcing bar, including ordinary concrete cylinder 4, the inside a plurality of mixed reinforcing bars that run through of ordinary concrete cylinder 4, the outer fringe department at ordinary concrete cylinder 4 is all established to the mixed reinforcing bar, be equipped with horizontal stirrup 5 at mixed reinforcing bar outlying co-altitude, the mixed reinforcing bar is by embedded reinforcing bar 1, ultra high performance concrete intermediate layer 2 and corrugated steel pipe 3 constitute, the periphery at embedded reinforcing bar 1 is established to 3 covers of corrugated steel pipe, be equipped with ultra high performance concrete intermediate layer 2 between the two, embedded reinforcing bar 1's top is higher than corrugated steel pipe 3, corrugated steel pipe 3 and embedded reinforcing bar 1 are placed concentrically.

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 is a schematic structural view of a hybrid steel bar, wherein fig. 7 (a) is a cross-sectional view of the hybrid steel bar, and fig. 7 (b) is an elevation view of the hybrid steel bar, and the corrugated steel pipe in the hybrid steel bar hardly transmits longitudinal load, but can realize circumferential uniform constraint, thereby improving the strength and ductility of the core ultra-high performance concrete. The corrugated steel pipe of the steel bar is used for restraining the ultra-high performance concrete as the longitudinal 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 utility model discloses in, only set up minor diameter corrugated steel pipe in limit portion, corrugated steel pipe diameter is not more than 100mm, adopts high fluidity materials such as ultra high performance concrete to fill the clearance between corrugated steel pipe and the reinforcing bar, and ultra high performance concrete takes place brittle failure when bearing longitudinal load easily usually. And the utility model discloses well ultra high performance concrete 2 is under the dual restraint of ripple steel pipe 3 and embedded reinforcing bar 1, and transverse deformation is restrained, and intensity and ductility all are increased substantially, have overcome the shortcoming that ultra high performance concrete takes place brittle failure easily.

Example 2

Referring to fig. 4, 5 and 6, fig. 4 is a schematic cross-sectional view of a reinforced concrete composite column including mixed rebars and reinforcing bars, fig. 5 is a schematic perspective view of a reinforced concrete composite column including mixed rebars and reinforcing bars, and fig. 6 is a schematic view of mixed rebars and transverse stirrups in a reinforced concrete composite column including mixed rebars and reinforcing bars; the utility model discloses a reinforced concrete combination column of mixed reinforcing bar, including ordinary concrete cylinder 4, the inside a plurality of mixed reinforcing bars and the reinforcing bar of being equipped with that runs through of ordinary concrete cylinder 4, mixed reinforcing bar and reinforcing bar are all established in the outer fringe department of ordinary concrete cylinder 4 and are extended to the top of ordinary concrete cylinder 4, mixed reinforcing bar and reinforcing bar set up in turn, mixed reinforcing bar is by embedded reinforcing bar 1, ultra high performance concrete intermediate layer 2 and corrugated steel pipe 3 constitute, the 3 covers of corrugated steel pipe are established in embedded reinforcing bar 1's periphery, be equipped with ultra high performance concrete intermediate layer 2 between the two, embedded reinforcing bar 1's top height flushes in corrugated steel pipe 3, corrugated steel pipe 3 and embedded reinforcing bar 1 are placed concentrically.

Referring to fig. 8, fig. 8 is an axial load-displacement curve of the combined column and the ordinary reinforced concrete column using the finite element method to simulate the same dimension and steel content, the component design makes the cross-sectional area superposition of the bellows 3 dimension and the embedded steel bar 1 dimension the same as the solid steel bar cross-sectional area, the same steel content is ensured, the single factor analysis is made, and the axial pressure performance of the combined column after the mixed steel bar replaces the solid steel bar is analyzed. Numerical simulation result shows, the limit bearing capacity of combination column is about 3 times of ordinary concrete column, and secondly the combination column is because inside bellows 3 and embedded reinforcing bar 1's constraint effect, and loading later stage bearing capacity has a small amplitude to rise again, at last the utility model discloses the ductility of combination column is obviously superior to ordinary reinforced concrete column, and it has fine ductility coefficient.

In other embodiments, the steel bars in the mixed steel bars can be concentrically arranged with the corrugated steel pipe and can also be eccentrically arranged, and the embedded steel bars mainly play a role in tensile strength.

A construction method of a reinforced concrete composite column containing mixed steel bars comprises the following steps:

the corrugated steel pipe 3 is vertically arranged, the embedded steel bar 1 and the corrugated steel pipe 3 are concentrically placed and fixed, the gap between the corrugated steel pipe 3 and the embedded steel bar 1 is filled with the ultra-high performance concrete interlayer 2, the corrugated steel pipe 3 and the common concrete are leveled at the port, maintenance is carried out, and the reinforced longitudinal mixed steel bar assembly is prefabricated, and the embodiment is shown in figure 5.

And binding the reinforced longitudinal mixed steel bar assembly and the transverse stirrups 5 into a steel reinforcement cage, and erecting a formwork.

And (5) pouring common concrete.

The cross section of the reinforced concrete combined column of the utility model can be any one of square, round or special-shaped column. In this embodiment, the combined column has a square cross-sectional form.

The utility model discloses a reinforced concrete combination column can reach bigger bearing capacity and ductility under the condition that the steel content is the same.

The above contents are only for explaining the technical idea of the present invention, and the protection scope of the present invention cannot be limited thereby, and any modification made on the basis of the technical solution according to the technical idea of the present invention all fall within the protection scope of the claims of the present invention.

Claims

1. A reinforced concrete composite column containing mixed steel bars is characterized by comprising a common concrete column body (4), wherein a plurality of mixed steel bars are arranged in the common concrete column body (4) at the same height, the mixed steel bars are all arranged at the outer edge of the common concrete column body (4), and a plurality of transverse stirrups (5) are arranged at different heights of the periphery of the mixed steel bars;

the mixed steel bar is composed of an embedded steel bar (1), an ultra-high performance concrete interlayer (2) and a corrugated steel pipe (3), the corrugated steel pipe (3) is sleeved on the periphery of the embedded steel bar (1), and the ultra-high performance concrete interlayer (2) is arranged between the embedded steel bar and the corrugated steel pipe;

the common concrete column (4) is in a regular quadrangular shape.

2. The reinforced concrete composite column with mixed steel bars as claimed in claim 1, wherein the steel bars (6) are arranged at the same height inside the general concrete column body (4), and the steel bars (6) and the mixed steel bars are arranged at the outer edge of the general concrete column body (4).

3. The reinforced concrete composite column containing hybrid steel bars as claimed in claim 2, wherein the steel bars (6) and the hybrid steel bars are alternately arranged.

4. A reinforced concrete composite column containing hybrid steel bars as claimed in claim 1 or 2, wherein the tops of the embedded steel bars (1) are flush with the corrugated steel pipe (3).

5. The reinforced concrete composite column containing hybrid steel rods as claimed in claim 1 or 2, wherein the corrugated steel pipes (3) have a diameter of not more than 100mm.

6. The reinforced concrete composite column containing hybrid steel bars as claimed in claim 1 or 2, wherein the section of the general concrete column body (4) is square or circular.

7. The reinforced concrete composite column containing hybrid steel bars as claimed in claim 1 or 2, wherein the corrugated steel pipes (3) and the embedded steel bars (1) are concentrically disposed.

8. The reinforced concrete composite column containing hybrid steel bars as claimed in claim 1 or 2, wherein the ultra high performance concrete sandwich (2) is made of UHPC ultra high performance concrete.