Joint structure

Abstract

This invention provides a joint structure that allows a steel-reinforced concrete beam to be joined to a steel column, even without requiring the main beam reinforcement to be continuous reinforcement spanning across the steel column. [Solution] The joint structure is a joint structure that connects a steel column 10 and a steel-reinforced concrete beam 20, and comprises a steel column 10, a steel portion 22 of the steel-reinforced concrete beam 20 joined to the steel column 10, joint concrete 30 covering the joint between the steel column 10 and the steel portion 22, and beam main reinforcement 24 of the steel-reinforced concrete beam 20 whose ends are anchored to the joint concrete 30.

Description

Technical Field

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[0001] The present invention relates to a joint structure.

Background Art

[0002] In Patent Document 1 below, in order to eliminate the difficulty of reinforcement work in passing reinforcing bars through columns and beams in the SRC structure, a structure is described in which the end of a steel truss beam is joined to the column base of a steel column.

Prior Art Document

Patent Document

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0008] In contrast, in the joint structure of claim 1, the ends of the main beam reinforcement are anchored to the joint concrete. This allows a steel-reinforced concrete beam to be joined to a steel column without the main beam reinforcement having to be continuous.

[0009] The joint structure of claim 2 is the joint structure of claim 1, wherein the joint concrete is wider than the steel-reinforced concrete beam.

[0010] In the joint structure of claim 2, since the joint concrete is formed wider than the steel-reinforced concrete beam, it is easier to resist the bearing pressure from the anchoring portion of the reinforcing bar end compared to the case where it is not. In addition, the wider joint concrete is easier to fix to the seismic isolation device.

[0011] The joint structure of claim 3 is the joint structure of claim 1 or 2, wherein the joint concrete is steel fiber reinforced concrete.

[0012] In the joint structure of claim 3, the resistance to bearing pressure from the anchoring portion of the reinforcing bar end can be increased compared to the case without fiber reinforcement.

[0013] The joint structure of claim 4 is the joint structure of claim 1 or 2, wherein the ends of the main reinforcement bars of the beam are fixed to the joint concrete by anchoring devices.

[0014] In the joint structure of claim 4, it is not necessary to bend the ends of the main beam reinforcement or provide hooks, making reinforcement easier to install. [Effects of the Invention]

[0015] According to the present invention, a steel-reinforced concrete beam can be joined to a steel column without requiring the main beam reinforcement to be continuous reinforcement spanning across the steel column. [Brief explanation of the drawing]

[0016] [Figure 1] (A) is a plan sectional view showing a joint portion structure according to an embodiment of the present invention, and (B) is a side sectional view. [Figure 2] It is a plan sectional view showing a modified example in which the joint concrete and the steel reinforced concrete beam are formed to have the same width in the joint portion structure according to an embodiment of the present invention. [Figure 3] It is a side sectional view showing a modified example in which the lower end bars are used as passing bars in the joint portion structure according to an embodiment of the present invention.

Mode for Carrying Out the Invention

[0017] Hereinafter, the joint portion structure according to an embodiment of the present invention will be described with reference to the drawings. Components denoted by the same reference numerals in each drawing mean the same components. However, unless otherwise specified in the specification, each component is not limited to one, and a plurality of them may exist.

[0018] In addition, the description of the overlapping configurations and reference numerals in each drawing may be omitted. Note that the present disclosure is not limited to the following embodiments, and modifications such as omitting configurations, replacing with different configurations, and combining one embodiment and various modified examples within the scope of the object of the present disclosure can be appropriately made and implemented.

[0019] <Joint portion structure> As shown in FIGS. 1(A) and (B), the joint portion structure according to an embodiment of the present invention is a structure of a joint portion J that joins a steel column 10 and a steel reinforced concrete beam 20.

[0020] The steel column 10 is a column formed of a square steel pipe and includes a diaphragm 12. The steel reinforced concrete beam 20 includes a steel frame portion 22 formed of an H-shaped steel, main beam bars 24, stirrups 26, and concrete 28.

[0021] The steel frame part 22 of the steel frame reinforced concrete beam 20 is joined to the steel frame column 10. More specifically, the upper and lower flanges of the steel frame part 22 are welded to the diaphragm 12 of the steel frame column 10 respectively. Also, the web of the steel frame part 22 is welded to the side surface of the steel frame column 10.

[0022] (Joint concrete) The joint part between the steel frame column 10 and the steel frame part 22 is covered with joint concrete 30. The width W1 of the joint concrete 30 is larger than the width W2 of the steel frame reinforced concrete beam 20. The composition of the joint concrete 30 is not particularly limited. As an example, this joint concrete 30 is steel fiber reinforced concrete in which steel fibers are kneaded.

[0023] Main reinforcement bars 32 and stirrups 34 are arranged inside the joint concrete 30. The main reinforcement bars 32 are longitudinal bars arranged in plurality along the outer peripheral part of the joint concrete 30. The stirrups 34 are circular reinforcing bars arranged to surround the main reinforcement bars 32 and are arranged at a predetermined interval in the vertical direction.

[0024] In the part where the web of the steel frame part 22 in the steel frame reinforced concrete beam 20 interferes with the stirrup 34, through holes are formed in the web of the steel frame part 22, and the stirrup 34 is used as a perforated bar.

[0025] The lower end surface of the joint concrete 30 is arranged below the lower end surface of the steel frame column 10. When constructing the joint concrete 30, in order to float the lower end surface of the steel frame column 10, a temporary column 10A may be arranged below the steel frame column 10. This temporary column 10A can be embedded in the joint concrete 30.

[0026] A seismic isolation device (not shown) may be arranged below the joint concrete 30. In other words, the joint concrete 30 may be supported by the seismic isolation device.

[0027] (Fixing of main beam reinforcement bars) As shown in Figure 1(B), the main beam reinforcement 24 is composed of upper reinforcement bars 24A arranged above and on both sides (diagonally upward) of the steel frame section 22, and lower reinforcement bars 24B arranged below and on both sides (diagonally downward) of the steel frame section 22.

[0028] The ends of the upper reinforcement bars 24A and lower reinforcement bars 24B are embedded in the joint concrete 30 and anchored to the joint concrete 30 using anchoring devices K. The anchoring devices K are positioned inside the main reinforcement bars 32 and stirrups 34.

[0029] Furthermore, the anchoring devices K are positioned in the area between the boundary between the concrete 28 and joint concrete 30 forming the steel-reinforced concrete beam 20 and the steel column 10 (in Figure 1(A), this is the area enclosed by the dashed line E1 with respect to the steel-reinforced concrete beam 20 on the left side of the page).

[0030] <Mechanism and Effects> In the joint structure according to the embodiment of the present invention, the ends of the beam main reinforcement 24 are anchored to the joint concrete 30. Therefore, the steel-reinforced concrete beam 20 can be joined to the steel column 10 even if the beam main reinforcement 24 is not made as a continuous reinforcement.

[0031] For example, if the column width of the steel column 10 is large, it is difficult to install the continuous beam main reinforcement, while the beam main reinforcement 24, which is not continuous, can be installed. In other words, the beam main reinforcement 24 is easy to install regardless of the column width of the steel column 10.

[0032] Furthermore, as shown by the dashed line in Figure 1(A), beam main reinforcement 24C can also be placed in a position that overlaps with the steel frame section 22 in a plan view (where the steel column 10 is located on the extension line).

[0033] Furthermore, in the joint structure according to the embodiment of the present invention, the joint concrete 30 is wider than the steel-reinforced concrete beam 20 (width W1 > width W2).

[0034] Because the joint concrete 30 is formed wider than the steel-reinforced concrete beam 20, it is easier to resist the bearing pressure from the anchoring device K at the end of the beam main reinforcement 24 compared to the case where it is not. In addition, the wider joint concrete 30 is easier to fix to the seismic isolation device.

[0035] Furthermore, in the joint structure according to the embodiment of the present invention, the joint concrete 30 is steel fiber reinforced concrete. By using such concrete, the resistance to bearing pressure from the anchoring device K at the end of the beam main reinforcement 24 can be increased compared to when it is not used.

[0036] Furthermore, in the joint structure according to the embodiment of the present invention, the ends of the beam main reinforcement bars 24 are anchored to the joint concrete 30 by anchoring devices K. This makes it easier to arrange the reinforcement bars because it is not necessary to bend the ends of the beam main reinforcement bars 24 or provide hooks.

[0037] <Variation> In the above embodiment, the joint concrete 30 is wider than the steel-reinforced concrete beam 20, but the embodiments of the present invention are not limited to this. For example, as shown in Figure 2, the joint concrete 30 and the steel-reinforced concrete beam 20 may be formed to be of equal width.

[0038] Furthermore, in the above embodiment, as shown in Figure 1(B), the ends of the upper reinforcement bar 24A and the lower reinforcement bar 24B are embedded in the joint concrete 30 and fixed to the joint concrete 30 using the anchoring device K, but the embodiments of the present invention are not limited to this.

[0039] For example, instead of the anchoring device K, the ends of the upper reinforcement bars 24A and lower reinforcement bars 24B may be bent into a hook-type anchoring system. Also, as shown in Figure 3, for example, the lower reinforcement bar 24B may be a continuous reinforcement bar. In other words, the present invention may partially include beam main reinforcement bars that are continuous reinforcement bars.

[0040] Furthermore, in the above embodiment, the joint concrete 30 is steel fiber reinforced concrete, but the embodiments of the present invention are not limited to this. For example, the joint concrete 30 may be made of high-strength concrete without steel fibers, or of ordinary concrete without steel fibers, etc. Alternatively, various organic fibers such as carbon fibers and aramid fibers may be used instead of steel fibers.

[0041] In these various modified cases, if the beam main reinforcement 24 is provided with its ends anchored to the joint concrete 30, it is easier to join the steel-reinforced concrete beam 20 to the steel column 10 compared to the case where all the beam main reinforcement is continuous reinforcement. [Explanation of Symbols]

[0042] 10 Steel columns 20 Steel-framed reinforced concrete beam 24 Beam main reinforcement 24A Top end reinforcement (beam main reinforcement) 24B Lower end reinforcement (beam main reinforcement) 24C beam main reinforcement 30 Joint concrete K Fixing device

Claims

1. This is a joint structure that connects a steel column and a steel-reinforced concrete beam. The aforementioned steel column, The steel frame portion of the steel-reinforced concrete beam, which is joined to the steel column, A joint concrete covering the joint between the steel column and the steel frame section, The main beam reinforcement of the steel-framed reinforced concrete beam, whose end is anchored to the joint concrete, A joint structure equipped with this feature.

2. The aforementioned joint concrete is wider than the aforementioned steel-reinforced concrete beam. The joint structure according to claim 1.

3. The aforementioned joint concrete is steel fiber reinforced concrete. The joint structure according to claim 1 or 2.

4. The joint structure according to claim 1 or 2, wherein the ends of the main reinforcement bars of the beam are fixed to the joint concrete by anchoring devices.

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