KR20140021277A - Hollow core pc composite column for src columns and src structures using the same - Google Patents

Abstract

The present invention relates to a hollow PC composite column and an SRC structure properly using the same, wherein the hollow PC composite column formed by partially forming an SRC column into PC has a sectional property maximized by the optimal composite of steel and concrete and allows works in a construction site to be simplified. According to the present invention, the hollow PC composite column for an SRC column is a hollow PC composite column formed by the composite of a steel frame and reinforced concrete, and comprises: multiple sectional steels separated each other and vertically arranged on a column section; strips installed to be bonded to the sectional steels, positioned between the sectional steels, and mutually connecting the sectional steels; a tie bar horizontally wounded around the outsides of the sectional steels; and cover concrete covering the outside of a prefabricated section and integrally formed into the PC, wherein the prefabricated section has the sectional steels, the strips, and the tie bar assembled each other. A hollow part is formed in the sectional steels. The hollow PC composite column can include studs further, wherein the studs are installed to be bonded to the outsides of the sectional steels and are buried in the cover concrete. Furthermore, the sectional steels can be formed into L-shaped steels and be arranged at the edges of the rectangular column section; or the tie bar can be a spiral reinforcing bar; or the cover concrete can be made from steel fiber reinforced concrete (SFRC) having a high deformation property for preventing the early crush of the cover concrete. The PC composite column according to the present invention is completed into the SRC column by filling core concrete in the hollow part at the center thereof.

Description

{Hollow Core PC Composite Column for SRC Columns and SRC Structures Using the Same}

The present invention relates to a hollow PC composite column in which a SRC column is partly made of a PC and an SRC structure using the hollow PC composite column in order to simplify the field work while maximizing the cross-sectional performance through optimum synthesis of steel-concrete.

Synthetic columns maximize cross-sectional performance through the combined effect of steel and concrete. They are widely used for columns of high-rise buildings and large structures that require high performance (strength, rigidity, ductility). In this composite column, a steel reinforced concrete (hereinafter referred to as SRC column) in which the concrete surrounds the steel is typical. FIG. 1 shows various cross-sectional shapes of conventional SRC columns.

Fig. 1 (a) corresponds to an H-shaped embedded column in the SRC column. As shown in Fig. 1 (a), H-shaped steel is placed at the center of the cross section and is surrounded by reinforced concrete. It is a classical SRC column that simply reinforces reinforced concrete outside the H-beam to increase strength, stiffness, ductility and so on. In this case, the bending performance against the weak axis of the H - shaped composite column is greatly lowered. In the case of the column where the majority of the steel section is in the center of the column at the same time, the bending moment and the bending moment performance are inferior. In case of using high strength steel of 600 MPa or more, concrete is placed on the outside of the steel, so that there is a higher strain on the concrete covering (the maximum compressive strain of the concrete is about 0.003 regardless of the strength) It may be difficult to utilize the yield strength of the steel. In addition, conventional embedded columns require reinforcement and formwork installation in the field.

Fig. 1 (b) is a partially embedded composite column of SRC columns, in which a steel flange is disposed on the outer periphery of the composite section, and the flange and the web are filled with concrete. Generally, to prevent local buckling of the steel, inter-flange link bars are welded at regular intervals. In some cases, band bars and cast iron bars are also installed. Since the SRC columns are located outside the concrete, the yield strength of the steel can be increased and the bending performance against the same cross sectional area is increased due to the increase of the moment arm length of the steel. However, the bending performance against the weak axis is also decreased, It has a disadvantage in that it does not show a large ductility ability because the effect is not so great, and that the exposed steel flange is required to have a refractory coating.

Fig. 1 (c) is a type A embedded composite column in the SRC column. It is a form specialized for the SRC composite cross-section, which is deviated from the conventional H-shaped embedded composite cross-section. The steel angles are integrated with each other using a strip, a steel strip, a lattice or the like (represented by a dotted line in FIG. 1 (c)) after arranging the steel angles or the steel angles symmetrically on the four corners of the cross section. to be. Since the steel section is concentrated on the corner, the contribution of the steel to the same cross-sectional area is increased and the utilization of the stress of the steel is maximized due to the increase of the moment arm length and the increase of the deformation amount. In addition, since the steel angle provides strong transverse confining force to the deep concrete at the corner where the concrete is most vulnerable due to the stress concentration, the load resistance and deformation capacity of the column are ensured even after the covering concrete is stripped. However, since the steel angle receives the axial force, lateral confinement force against deep concrete can be abruptly lost after local buckling. In addition, work formwork is still required in the field, and pre-assembling of steel and reinforcing steel is often used, but in some cases reinforcement of the site reinforcement is also necessary.

The present invention has been developed in order to simultaneously improve the structural problem of the SRC column and the field construction problem. In order to maximize the sectional performance and simplify the site work by optimizing the steel-concrete, There is a technical problem to provide an SRC structure using a PC synthetic column and the hollow PC synthetic column.

In order to solve the above-mentioned technical problems, the present invention provides a hollow PC composite column in which a steel frame and a reinforced concrete are synthesized, the hollow PC composite column comprising: A strip plate joined to the steel material so as to connect the plurality of steel materials in the middle of the steel material; A band reinforcing bar that surrounds a plurality of shaped steel members in the lateral direction from the outside of the shaped steel member; Hollow PC composite pillar, characterized in that the hollow portion is formed in the inner portion of the steel member; including; the coated concrete which is integrally PC while covering the line assembly section from the outside of the line assembly section assembled with the steel plate, strip plate and the reinforcing bar To provide. Here, the stud may be further provided to be bonded to the outer surface of the steel material and embedded in the coated concrete. Furthermore, the section steel is formed as a steel section and placed at the corner of the rectangular column section, or the strip steel is formed of a spiral reinforcing steel, or the covering concrete is formed of a steel fiber reinforced concrete (SFRC) .

The present invention also relates to a hollow PC composite column as described above; And a deep concrete filled in the hollow portion of the hollow PC composite column. In this case, the hollow PC composite column is provided so that the steel material is further projected on the covered concrete, so that the steel material protruding above the coated concrete of the hollow PC composite column can be integrated with the beam, and the deep concrete can be filled with the high strength concrete.

According to the present invention, the following effects can be expected.

First, since the hollow PC composite column is provided through the partial PC of SRC column, it is possible to omit the field reinforcement and formwork installation process in the SRC column construction, thereby improving the overall workability.

Second, because the SRC column is completed with a cross-sectional structure in which the steel section is concentratedly disposed on the outside of the cross-section, the increase in the moment arm length of the steel material with high rigidity can greatly increase the cross- In case of receiving section, the deformation of steel is increased and the strength of steel can be fully utilized. Particularly, when the SRC column is finished with a rectangular cross section, the b-shaped steel is completed to be symmetrically arranged at the four corners, so that it exhibits excellent biaxial bending performance compared to the same cross sectional area. In this way, the performance against the same cross-sectional area of the steel can be increased, so that the amount of steel can be reduced while omitting the cast iron.

Third, since the cross-section of the SRC column is made into a PC and made into a hollow PC synthetic column, it can be easily integrated through the hollow part of the hollow PC composite column, and the RC structure, steel structure, Structure can be applied to all.

Figure 1 is a cross section of a conventional composite column.
2A and 2B are a cross-sectional view and a perspective view of a hollow PC composite column according to the present invention.
FIG. 3 is a flowchart illustrating a manufacturing process of the hollow PC composite column of FIG. 2A.
4 is a cross-sectional view of a completed SRC column filled with deep concrete in the hollow PC composite column of FIG.
FIG. 5 is a cross-sectional view of the SRC column and beam in the SRC structure according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to the accompanying drawings and preferred embodiments.

2A and 2B are a cross-sectional view and a perspective view of a hollow PC synthetic column 100 for a SRC column according to the present invention. As shown in the figure, the hollow PC composite column 100 for the SRC column according to the present invention is a PC column in which the steel frame and the reinforced concrete are combined so that the hollow portion 100a is formed at the center.

Specifically, the hollow PC composite column 100 for a SRC column according to the present invention includes: a plurality of shaped steel members 110 arranged vertically apart from each other in a columnar section; A strip (120) joined to the shaped steel (110) to connect the plurality of shaped steels (110) to each other in the middle of the shaped steel; A band reinforcing bar (130) surrounding the plurality of shaped steel plates (110) in the transverse direction outside the shaped steel plate (110); And the cover concrete 140 integrally PCized while covering the line assembly cross section outside the line assembly cross section in which the section steel 110, the strip plate 120, and the strip reinforcing rod 130 are assembled. 110, the hollow portion (100a) is formed inside. The SRC column was constructed by placing the steel frame at the outer edge of the section, and the outer edge of the section was made into a PC through the steel frame as a hollow column.

In the hollow PC composite column 100 for the SRC column, the shaped steel member 110 is a structural member that simultaneously resists bending and axial force. Since it is located at the outer edge of the SRC column, the utilization of the strength is maximized. Accordingly, the cast iron can be omitted in the present invention. 2A and 2B illustrate a hollow PC composite column 100 having a rectangular cross section in consideration of SRC columns having a rectangular cross section. As a result, a shaped steel material 110 made of a-shaped steel is disposed at four corners of a square. The corner arrangement of a steel section is ideal because it can maximize the bi-directional bending performance compared to the same cross-sectional area. On the other hand, a stud 150 may be further attached to the outer surface of the shaped steel member 110 in order to ensure adhesion of the shaped steel member 110 and the covered concrete 140. The studs 150 are welded to the shaped steel 110 at regular intervals, and their positions and spacing are determined at a minimum required level.

The shaped steel members 110 spaced apart from each other are welded to each other using a strip 120. The strips 120 are integrated with each other to transmit the shear force. The localized buckling of the shaped steel material 110 is mainly prevented by the band steel bars 130. Therefore, it is sufficient to provide only the minimum number of the strips 120 necessary for ensuring the integrity of the steel plates 110 and transferring the shear force, 110), it is appropriate to install it in only about three places. Such a strip 120 can be installed either inside or outside the shaped steel member 110. The hollow PC composite column 100 can be easily welded if the band plate 140 is provided outside the steel frame 110. However, if the inner wall of the hollow PC composite column 100 is somewhat inconvenient, It is possible to easily remove the inner mold (IF) by reducing the contact area between the inner mold (IF) and the PC part.

The strip reinforcing bar 130 is installed to surround the shaped steel material 110 to transverse the shaped steel material 110 and thereby to suppress the local buckling of the shaped steel material 110. In addition, the reinforcing bars 130 provide strong transverse confining force to the deep concrete 200 filled in the hollow PC composite column 100. The bar reinforcement 130 is installed over the entire length of the column, and various deformed bars of various shapes and diameters are appropriately selected to exhibit high restraint effect and adhesion ability. Especially, it is preferable to use a spiral reinforcing bar as the reinforcing bar 130. Since the helical reinforcing bar is advantageous in shear resistance due to securing continuity, (tag or spot welding), and unpacking it automatically spreads down with a constant interval, so installation is very easy. In FIG. 2B, a hollow reinforcing bar 130 made of a square spiral reinforcing bar is wound around the shaped steel material 110 by means of a-shaped steel to complete the hollow PC synthetic column 100 having a rectangular cross section.

The coated concrete 140 is a concrete part formed by covering the outer side of the pre-assembled cross section where the shaped steel material 110, the strip 120 and the steel bar 130 are assembled, and the steel material 110, the strip 120, The reinforcing bar 130 is integrated into a PC. It is used for eliminating the molding work in the field through the PCization and also for preventing the refractory or corrosion of the steel strip 110 and the steel strip 130. It is preferable to use the coated concrete 140 as a steel fiber reinforced concrete (SFRC). By using the SFRC having excellent deformability, it is possible to minimize the damage of the coated concrete 140 during manufacture, transportation and installation, 140 can be prevented from being prematurely collapsed so that sufficient stress can be utilized in the shaped steel material 110. On the other hand, since the strength of the coated concrete 140 is not so high, it is not necessary to use high-strength concrete. Instead, it is possible to secure a high ductility even at a relatively low mixing ratio rather than a high- Lt; RTI ID = 0.0 > concrete. ≪ / RTI >

FIG. 3 is a flowchart of a manufacturing process of the hollow PC composite column 100 of FIG. As shown, the hollow PC composite column 100 is manufactured using inner and outer molds (IF, OF). A section of a steel frame having a closed structure is formed by using the first type steel member 110 and the band plate 120 and the studs 150 are installed at regular intervals after surrounding the band steel bars 130 outside the assembled steel member end face. Thereafter, the inner mold (IF) is disposed in contact with the inner surface, the outer mold (OF) is spaced apart from the outer surface, and the covered concrete (140) is gravity laid. The outer mold (OF) should be able to withstand the side pressure of the covered concrete (140) and the inner mold (IF) should be easy to peel off. However, since the hollow PC composite column 100 of the present invention is preferably proposed to have the minimum thickness of the coated concrete 140, the side pressure of the concrete acting on the outer formwork (OF) is expected to be small. On the other hand, It is expected that the inner mold IF can be easily peeled off due to the occurrence of a weak facet or partial discontinuity between the coated concrete 140 and the inner mold IF due to the belt 110, the strip 120, the belt bar 130 and the like.

FIG. 4 is a cross-sectional view of a completed SRC column using the hollow PC composite column 100 of FIG. 2A. As can be seen, the hollow part (100a) of the hollow PC composite column is filled with the deep concrete (200) in the field and completed with the SRC column. The hollow PC composite column 100 composed of the cross section of the steel structure formed by the shaped steel material 110 and the strip 120 and the strip reinforcing bars 130 and the cover concrete 140 formed by integrating them into a PC, So that it is not necessary to use a separate formwork. Moreover, since there is no complicated reinforcement in the hollow portion 100a, the deep concrete 200 can be easily installed. In this way, the SRC column using the hollow PC composite column 100 can reduce the construction cost as well as the air shortening because the reinforcement work and the formwork are omitted in the field. In addition, the hollow PC composite column (100), the durability of the SRC column can be increased.

The deep concrete 200 of the completed SRC column is laterally confined by the hollow PC composite column. Particularly, since the reinforcing bar 120 not only provides strong lateral confining force to the deep concrete 200 but also prevents the local buckling of the shaped steel material 110, 110) also contributes to the transverse velocity of the deep concrete 200. The transverse confined deep concrete (200) increases strength and ductility, thereby increasing the cross-sectional performance of the finished SRC column.

On the other hand, in order to reinforce the strength and rigidity of the entire SRC column, the deep concrete 200 is preferably a high strength concrete. Particularly, since the pre-assembled cross section of the hollow PC composite column 100 made of the shaped steel material 110, the strip 120 and the reinforcing bars 130 provides strong lateral confinement to the deep concrete 200, the high brittleness of the high strength concrete It is possible to overcome.

FIG. 5 is a cross-sectional view of the SRC column and beam in the SRC structure according to the present invention. 5, a hollow PC composite column 100 is shown in which a shaped steel material 110 is further protruded onto a covered concrete 140. This hollow PC composite column 100 is formed by using a projected steel material 110 And it is also advantageous in the integration work with the beam. Here, the integration with the beam is realized by passing the beam through the protruding shaped steel material 110. A deep concrete 200 penetratingly installed between the reinforcing ribs of the RC beams or the PC beams or the steel beams 110 protruding from the steel beams and poured into the hollow portion 100a of the hollow PC synthetic column 100, It is construction. Particularly, in case of PC beam and steel beam, it can be applied by placing it on the covered concrete (140) of the hollow PC composite column.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, the present invention is not limited to the above-described exemplary embodiments, and various modifications, additions and substitutions may be made without departing from the scope of the present invention. And the scope of the present invention is defined by the appended claims.

100: hollow PC synthetic column
100a: hollow portion
110: shaped steel
120: Strip
130:
140: Covered concrete
150: Stud
200: Deep concrete
IF: Internal formwork
OF: outer die

Claims (6)

It is a hollow PC composite column composed of steel and reinforced concrete,
A plurality of shaped steels (110) vertically spaced apart from each other by column sections;
A strip plate 120 which is joined to a steel material 110 to connect a plurality of shaped steels 110 in the middle of the steel strip 110;
A band reinforcing bar (130) surrounding the plurality of shaped steel plates (110) in the transverse direction outside the shaped steel plate (110);
A cover concrete 140 formed integrally with the cover steel 140 while covering the pre-assembled cross-section at the outer side of the pre-assembled cross section where the shaped steel material 110, the strip 120, and the steel bar 130 are assembled;
Hollow PC composite pillar 100, characterized in that the hollow portion (100a) is formed to be configured to include the inside of the shaped steel (110). In claim 1,
A stud 150 installed on the outer surface of the shaped steel 110 and embedded in the covered concrete 140;
(100). ≪ RTI ID = 0.0 > 11. < / RTI > 3. The method according to claim 1 or 2,
The shaped steel member 110 may be provided as a steel section and disposed at a corner of a rectangular pillar section or the steel strip 130 may be formed of a spiral reinforcing steel or the coated concrete 140 may be provided as a steel fiber reinforced concrete Characterized by a hollow PC synthetic column (100). A hollow PC composite pole (100) according to any one of claims 1 to 3;
A deep concrete 200 filled in the hollow portion 100a of the hollow PC composite column;
Wherein the hollow PC composite column has an SRC structure. 5. The method of claim 4,
The hollow PC composite column 100 is formed such that the shaped steel material 110 is further projected over the covered concrete 140,
Further comprising a beam integrally formed with the shaped steel material (110) formed on the cover concrete (140) of the hollow PC composite column (100). 5. The method of claim 4,
The hollow PC composite column 100 may be formed by forming a steel frame 110 in a shape of a steel so as to be disposed at an edge of a rectangular pillar section or by providing a steel strip 130 as a spiral reinforcing steel or a coated concrete 140 as a steel fiber reinforced concrete (SFRC)
The deep concrete 200 is filled with high-strength concrete by the hollow PC composite column SRC structure.

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