JPH0118721Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement in the structure of a steel reinforced concrete joint.

Column-beam joints (joint parts) in architectural structures are subject to the most severe mechanical stress, so the greatest care is taken at each stage of design, processing, and construction.
Conventionally, in steel frame structures (steel structures, steel reinforced concrete structures), the beam steel flanges are welded to the column steel flanges on-site by full penetration butt welding, as shown on the right side of Figure 1, or the beam steel flanges are welded to the column steel flanges on-site by full penetration butt welding, as shown on the right side of Figure 1. As shown in Figure 2, a method is used in which a beam steel frame approximately 1 m long is welded to a column steel frame using full penetration butt welding in a factory, and then the beam body is joined with high-strength bolts on site. In Figure 1, a is a plan view and b is a front view. In the figure, 1 is a column steel frame, 1f is a column steel flange, 2 is a beam steel frame, 2f is a beam steel flange, 3 is a high-strength bolt, and 4 is a concrete part. . or,
At the start and end points of full penetration butt welding, end tabs 5 are generally used to eliminate weld defects. Furthermore, a stiffener 6 is arranged at the position where the beam steel frame is attached to the column steel frame in order to smooth the flow of stress.

As mentioned above, in conventional structures, full penetration butt welding is essential, which requires advanced processing and manufacturing techniques and quality control, and requires a great deal of effort. Furthermore, stiffeners in steel-framed reinforced concrete structures not only take time and effort to attach, especially to closed-section columns, but also become an obstacle during concrete pouring, causing a loss in concrete filling properties.

The present invention solves the problems of the conventional joint structure described above, does not use full penetration butt welding,
In particular, it is an object of the present invention to provide an easy-to-construct steel-framed reinforced concrete joint structure that can eliminate on-site welding and improve quality control.

The structure of the steel reinforced concrete joint section of this invention uses a steel material with protrusions as the flange of the steel frame, and connects the column steel frame and beam steel web with high-strength bolts via brackets welded to the column steel frame. It is characterized by having deformed reinforcing bars for stress transmission placed on the outside of the steel. The details will be explained below with reference to explanatory drawings and example drawings.

FIG. 2 is an explanatory view of the joint structure of the present invention, in which a is a plan view and b is a front view. In the figure, 1 is the column steel frame, 1f is the column steel flange, 2 is the beam steel frame, 2f
is a beam steel flange, and steel materials with protrusions are used as the steel frame flange portions of the columns and beams (the protrusions are omitted in Figure A). Reference numeral 7 denotes a bracket welded to the column steel frame, and the web portion 2w of the beam steel frame is joined to this bracket by high-strength bolts 3, so that full penetration butt welding of the column and beam flanges is not performed. Reference numeral 8 denotes a stress-transmitting deformed reinforcing bar placed outside the beam steel flange, which is used to transmit stress at the end of the beam steel flange material to the column steel flange. This may be smaller than the cross section of the beam steel flange, and since the stress is transmitted through this reinforcing bar, column stiffeners are not required.

Needless to say, in addition to the constituent members that characterize the present invention, main reinforcements, ties, stirrups, etc. of columns and beams, which are normally used for column and beam construction, may be used.

Figures 3, 4, and 5 show one embodiment of the structure of a steel-framed reinforced concrete joint according to the present invention. Figure 3 is a perspective view, Figure 4 is a side view, and Figure 5 is a front view. (Protrusion illustration is omitted). In the figure,
9 is a column main reinforcement, 10 is a beam main reinforcement, 11 is a tie reinforcement, 12 is a stirrup, and other symbols are the same as in FIGS. 1 and 2. Projected steel materials are used for the flanges of the steel frames 1 and 2 of the columns and beams, and the webs of the column steel frames 1 and beam steel frames 2 are joined by high-strength bolts 3 via brackets 7 welded to the column steel frames 1. , a plurality of deformed reinforcing bars 8 for stress transmission are arranged on the outside of the beam steel frame flange 2f.

According to the above-mentioned joint structure of the present invention, the following effects can be obtained.

(1) Because the protrusions of the steel flange can be expected to provide a sufficiently large adhesion force between the steel frame and concrete, the stress of the steel flange can be easily transmitted to the reinforcing bars through the concrete. In other words, the stress in the beam steel flange is easily transmitted to the column through the following route. Beam steel flange → concrete →
Stress transmission reinforcement → concrete → column steel flange This eliminates the need for full penetration butt welding, which requires advanced manufacturing technology and quality control.

(2) Since only the beam steel webs need to be connected using high-strength bolts, assembly and construction on site is extremely easy, and the construction period can be significantly shortened. In addition, the column steel frame only needs to transmit stress from the beam steel web, so it can be small, which improves concrete filling properties and improves workability.

(3) Since stiffeners are not attached to the column steel frame, the labor of processing and manufacturing is saved and the filling properties of concrete are improved.

(4) Steel-framed reinforced concrete structures, which originally had excellent earthquake resistance but were often avoided because they required advanced processing and construction techniques, can now be generalized to the same level as reinforced concrete structures.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram of the structure of a conventional joint section, and Figure a
is a plan view, and Figure b is a front view. FIG. 2 is an explanatory view of the joint structure of the present invention, in which figure a is a plan view and figure b is a front view. Figures 3, 4, and 5 are views showing one embodiment of the joint structure of the present invention, where Figure 3 is a perspective view, Figure 4 is a side view, and Figure 5 is a front view. . 1: Column steel frame, 1f: Column steel flange, 2: Beam steel frame, 2f: Beam steel flange, 2w: Beam steel web, W: Full penetration butt weld, 3: High strength bolt, 4: Concrete part, 5: End tab ,
6: Stiffener, 7: Bracket, 8: Deformed reinforcing bar for stress transmission, 9: Column main reinforcement, 10: Beam main reinforcement, 11:
Stirrups, 12: Stirrups.

Claims (1)

[Scope of utility model registration request] Using steel material with protrusions as the flange part of the steel frame,
A structure of a steel-framed reinforced concrete joint section characterized by connecting a column steel frame and a beam steel web with high-strength bolts via a bracket welded to the column steel frame, and arranging deformed reinforcing bars for stress transmission on the outside of the beam steel flange.