JPH08144366A - Joint structure of steel encased reinforced concrete column or steel frame column with steel frame beam - Google Patents

Abstract

PURPOSE: To smoothly transmit the load from a beam to a column by fixing a web part, which is positioned upper than a neutral shaft of a steel frame beam, and a lower flange part to a steel frame column through a connecting fitting, and arranging reinforcements for floor in the periphery of the column like a grid. CONSTITUTION: At the time of connectign a steel frame beam 2 made of I-shape steel to a steel encased reinforced concrete column 1, connecting fittings 3, 4 made of angle steel are fixed to the steel frame column 1a at the predetermined position, and a web part, which is positioned upper than a neutral shaft of the steel frame column 1a, and a lower flange part are fitted. Reinforcements 6 for floor are arranged like a grid in the periphery of the steel frame column 1a. The reinforcements 6 can be arranged in the direction inclined at 45 deg. to the side of the steel frame column. Thereafter, concrete is placed so as to integrate the column and the beam. The bending moment and the shearing force applied to the beam 2 is thereby smoothly transmitted to the column. Construction can be thereby efficiently performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel reinforced concrete column or a joint structure between a steel column and a steel beam.

[0002]

2. Description of the Related Art Conventionally, as shown in, for example, Japanese Patent Application Laid-Open No. 57-20458, the pillar and beam steel frames are joined to each other only at one point of the beam web or the lower flange with the joining metal and the high-strength bolt. Then, weld the shear connector for fixing the floor slab to the upper flange of the beam, arrange the reinforcing bar above the beam along the longitudinal direction of the beam and fix the reinforcing bar to the steel reinforced concrete column, A reinforced concrete floor slab containing reinforcing bars was formed on.

FIG. 6 is a view in which a steel frame column 1a and a steel frame beam 2 are joined together by using a metal joint at one web portion of the steel frame beam, and FIG. 7 is a diagram showing the steel frame column 1a and the steel frame beam 2 joined together. It is the figure which joined with the joining metal fitting in one place of the lower flange part.

[0004]

Therefore, the conventional structure has the following problems.

(A) In order to transmit the bending moment of the beam to the column, only the joining metal part of the web portion and the reinforcing bar in the floor slab as shown in FIG.

(B) Further, as shown in FIG. 7, only the metal joint of the lower flange portion of the steel frame beam 2 does not have sufficient resistance to the shearing force of the steel frame beam 2 and its application range is narrow.

(C) In the conventional method, the reinforcing bars are arranged along the longitudinal direction on the upper part of the beam and the reinforcing bars are fixed to the steel frame reinforced concrete columns to form the reinforced concrete floor slab containing the reinforcing bars on the upper surface of the beam. There were damages to the reinforcing bars that were caused by the interference between the steel columns and the reinforcing bars and the bending of the reinforcing bars inside the deck. Moreover, due to the interference between the steel columns and the reinforcing bars, the number of reinforcing bars and the diameter of the reinforcing bars were restricted. Therefore, there was a problem in the performance of joints of columns and beams, quality control, construction, etc., and the application range was narrowed.

The present invention has been devised to solve such a problem.

[0009]

In a joint between a steel-framed reinforced concrete column or a steel-framed column and a steel-framed beam, a part of the web of the steel-framed column that is offset to the upper side of the neutral axis of the beam to be joined and the bottom of the beam Secure the metal fitting to the flange part,
The web of the beam and the lower flange are attached to the joint hardware, respectively, and the cross section axis of the lattice or the column is 45 ° around the steel column.
The main purpose is a steel-framed reinforced concrete column or a joint structure of steel-framed columns and steel-framed columns, in which reinforcing bars are arranged in the inclined direction and concrete is cast to form a slab.

[0010]

[Operation] The operation of the present invention is as follows.

(B) Since the steel frame column and the beam are joined by the lower flange joint metal of the beam, the bending moment applied to the beam can be sufficiently transmitted to the column.

(B) Since the steel frame column and the beam are joined by the metal member for joining the web of the beam, the shearing force applied to the beam can be sufficiently transmitted to the column.

(C) By constructing the reinforcing bars in a lattice pattern on the outer circumference of the steel frame, interference between the steel frame columns and the reinforcing bars can be avoided, and damage due to bending of the reinforcing bars, restriction of the number of reinforcing bars, and restriction of the diameter of the reinforcing bars are eliminated. It also solves the problems of performance, quality control, and construction of the joint.

(D) In particular, when the periphery of the steel frame column is surrounded by reinforcing bars in a direction inclined by 45 ° with respect to the sectional axis of the steel frame column, cracks at the corners of the floor slab, which are generally liable to occur, are expanded or the crack width is expanded. The prevention effect is great.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

FIG. 1 is an elevational view showing an embodiment of the present invention. Steel frame column 1a embedded in steel frame reinforced concrete column 1
Of the metal member 3 for joining the steel beam 2 to the web portion that is offset to the upper side from the neutral axis of the steel beam 2 to be joined.
And the metal fitting 4 of the lower flange portion is fixed to the lower flange portion of the steel beam 2, the web of the steel beam 2 is bonded to the metal fitting 3 of the web portion, and the metal joint 2 of the steel beam 2 is bonded to the metal fitting 4 of the lower flange portion. Attach the lower flange to form the column-beam connection. The joining metal piece 3 of the web portion is provided in the portion of the web which is offset to the upper side of the neutral axis of the beam in order to effectively transmit a part of the bending moment from the steel beam 2 to the steel column 1a. Thus, the grid-shaped reinforcing bars 6 are laid out in the upper part of the steel beam 2 and around the steel columns 1a, and the grid-shaped reinforcing bars 6 are embedded to pave floor slab concrete. Therefore, there is no interference between the steel-framed columns 1a in the steel-framed reinforced concrete columns 1 and the concrete reinforcement of the columns and the reinforcing rods in the floor slab, and there are no restrictions on bending of the reinforcing bar, the number of reinforcing bars, the diameter of the reinforcing bar, etc. The application range of is widened.

FIG. 2 is a plan view of FIG. Further, FIG. 3 shows an example in which the reinforcing bars 6a of the floor slab on the steel beam 2 are arranged in a grid with an inclination of 45 ° with respect to the cross-sectional axis of the column. The effect of preventing the expansion of

The above-described joint structure between the steel-framed reinforced concrete and the steel beam can be applied to the joint between the steel column and the steel beam.

FIGS. 4 (a), (b), (c) and (d) are views showing an example of a metal joint for the web portion, and FIG. 5 (a),
(B), (c), (d) is a figure which shows the example of the metal fitting of a lower flange part.

[0020]

The effects of the present invention are as follows.

(A) Since the steel frame column and the beam are joined by the lower flange joint metal of the beam, the bending moment applied to the beam can be sufficiently transmitted to the column.

(B) Since the steel frame column and the beam are joined by the metal member for joining the beam to the web, the shearing force applied to the beam can be sufficiently transmitted to the column.

(C) Reinforcing steel-reinforced concrete columns and floor slabs for arranging grid-like reinforcing bars around the upper part of the steel beam and around the steel columns, and embedding the grid-like reinforcing bars to drive floor slab concrete Without interfering with the internal reinforcing bars, there is no restriction on the bending of the reinforcing bars, the number of reinforcing bars, the diameter of the reinforcing bars, etc., and the application range of the joint structure is widened.

(D) In the example in which the reinforcing bars of the floor slab above the steel beam are arranged in a lattice pattern inclined at 45 ° with respect to the cross-sectional axis of the column, crack prevention or crack width at the corners of the floor slab, which generally tends to occur The effect of preventing the expansion of is great.

[Brief description of drawings]

FIG. 1 is an elevational view showing an embodiment of the present invention.

FIG. 2 is a plan view of FIG.

[Fig. 3] Reinforcing bar 6a of the floor slab on the steel beam 2 is used as the cross section axis of the column.
It is the figure which inclined 45 degrees and arranged a lattice.

4 (a), (b), (c) and (d) are diagrams showing examples of a metal joint for a web portion.

5 (a), (b), (c) and (d) are diagrams showing examples of a metal joint for a lower flange portion.

FIG. 6 is a view showing a conventional joint structure composed of a metal joint only for a web portion.

FIG. 7 is a view showing a conventional joint structure composed of a metal joint only for a lower flange portion.

[Explanation of symbols]

1 ... Steel reinforced concrete column, 1a ... Steel column,
2 ... Steel beam, 3 ... Joined metal for web part, 4 ...
..Metal fittings of the lower flange portion, 5 ... Main bars of steel reinforced concrete columns, 6 ... Lattices around the steel columns, 6a ... Lattices inclined at 45 ° to the cross section axis of the steel columns,
7 ... Floor slab

Claims (4)

[Claims] 1. In a connection between a steel reinforced concrete column and a steel beam, a portion of a web of the steel column constituting the steel reinforced concrete column, which is offset to an upper side from a neutral axis of the beam to be joined, and a lower flange of the beam. Fix the joint metal to the part, attach the web of the beam and the lower flange to the joint metal, respectively, arrange the reinforcing bars in a lattice pattern around the steel column, and place concrete on the floor slab. A joint structure of steel reinforced concrete columns and steel beams characterized by being formed. 2. In a joint between a steel column and a steel beam, a metal joint is fixed to a portion of a web of the steel column that is offset to an upper side from a neutral axis of the beam to be joined and a lower flange portion of the beam. Then, the web of the beam and the lower flange are respectively attached to the joint metal, the reinforcing bars are arranged around the steel column in a grid pattern, and concrete is cast to form a floor slab. The joint structure of steel columns and beams. 3. A steel slab according to claim 1, wherein reinforcing bars are arranged around the steel frame pillar in a direction inclined by 45 ° with respect to the sectional axis of the steel frame pillar, and concrete is cast to form a floor slab. The joint structure between a steel reinforced concrete column and a steel beam according to claim 1. 4. A floor slab is formed by placing concrete around a steel column according to claim 2 in a direction inclined by 45 ° with respect to the sectional axis of the steel column and placing concrete. The joint structure of a steel column and a steel beam according to claim 2.