JPS60250146A - Connection structure of iron wire for construction - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a joint structure of steel frames for structures, such as columns and beam steel frames constituting a rigid frame frame.

Problems to be Solved by the Invention Some of the columns and beam steel frames constituting conventional rigid frame structures are rigidly joined using T-shaped hardware such as split tees.

Since the joint member yield strength of this T-shaped metal fitting is high, the strength and deformation capacity required of the structure, that is, the energy absorption capacity, is expected from the strength and deformation capacity of the column and beam members. For this reason, it is necessary to use pillar and beam members with high deformability. However, some shaped steel, such as lightweight shaped steel, have poor deformability, and if the middle of the member is deformed, it will be necessary to devise ways to attach the wall.

In order to solve the above-mentioned problems, the present invention aims to provide a T-shaped joint with both proof strength and deformability.

Structure and Examples of the Invention The gist of the present invention is the structure described in the claims section, and its main part is that the substrate of the T-shaped metal fitting has a gap between it and the member. The board is attached to the board so that it deforms and hangs under a load exceeding a predetermined value.

The details of the configuration will be explained below with reference to illustrated embodiments.
.

In the figure, 1 is a T-shaped hardware, 2 is a column, and 3 is a beam. The T-shaped hardware 1 consists of a base plate 4 and a flange 5, and on the outer surface of the base plate 4, a gap holding portion 6 in the form of a protrusion or a washer is formed either integrally or separately.

Various modifications of this gap holding part 60 are shown in FIGS. 10 to 13.
As shown in the figure, they are formed continuously or intermittently near both sides or at both ends.

When in use, place the base plate 4 of the T-shaped hardware 1 on the pillar 2, secure the gap W, and connect with the bolt 7.
The flange 5 of the shaped hardware 1 is fixed to the beam 3 by bolts or welding.

FIG. 3 shows a case where the T-shaped metal fitting 1 having the deformability described above is used for the lower flange of the beam 3 and the column 2, and the ordinary T-shaped metal fitting 8 is used for the upper flange and the column. The deformability of the frame is controlled by the amount of deformation δ of the T-shaped hardware 1 on which tensile stress acts, and the interlayer deformation angle r of the frame is expressed as r=δ/H when the columns and beams are rigid bodies. If the possible deformation amount δ of the T-shaped hardware is constant, the interlayer deformation angle of the frame becomes smaller as the beam height H becomes larger.

Figure 4 shows the use of T-shaped metal fittings 1 that have the ability to deform both the upper and lower flanges of the beam, and the amount of deformation δ of the upper T-shaped metal fittings 1 on which compressive stress acts is utilized as the deformation capacity of the frame. The interlayer deformation angle of the frame r l”r, r −
This is expressed as (δ1+δ2)/H, and the deformability of the frame can be made much stronger than in the previous case. Therefore, by selecting the above two types of structures corresponding to the beam height H, the necessary deformation ability can be ensured.

In the present invention, when a web plate for transmitting shear force is used between the webs of a column and a beam, it is necessary to have a structure that does not inhibit the deformation ability of the T-shaped hardware. Therefore, in FIG. 5.6, the bolt holes 10 of the web plate 9 are made into horizontally long slit holes to provide deformation followability. In addition, in Figures 7 to 9, the L engraving 11 is used.
Deformation followability is brought about by the deformation of the engraving 11, and FIG. 8 shows a case where a compressive force is applied, and FIG. 9 shows a case where a tensile force acts.

The T-shaped hardware 1 has a plate thickness and a thickness that satisfies the yield strength and deformability.
By adjusting the material such as strength, it is possible to produce a cut T-shaped steel manufactured from rolled H-shaped steel, an assembled shaped steel made into an I) T-shaped steel by welding, and a T-shaped steel manufactured by casting.

Effects of the Invention First, in the conventional split tee type joint structure, the split tee, that is, the T-shaped hardware, is designed with the assumption that a tensile force equal to the bending moment acting on the beam divided by the beam force h is applied. The yield strength of the T-shaped hardware should exceed the total plastic tensile force obtained by dividing the total plastic moment of the beam by the beam weight h. For this reason, when a horizontal force due to a large earthquake acts on the frame, the υ frame is required to undergo deformation of the beam as shown in Figure 16 after the beam reaches its full plastic strength as shown schematically in Figure 14. The required amount of deformation is secured. Therefore, the beam member is required to be highly deformable.

When a member with poor deformability is used, the rigidity decreases rapidly after the maximum proof stress, as shown in FIG.

On the other hand, in this invention, the beam yields below the yield strength,
In addition, since we used T-shaped joints that can secure the necessary deformation capacity before the beam reaches its total plastic moment, the joints deform as shown schematically in Figure 19, and the structure caused by this deformation deforms. If the increase in the yield strength of the joint hardware is less than the total plastic strength of the beam until the amount of deformation reaches the required deformation capacity, the strength and deformation capacity of the joint metal will be utilized as the strength and deformation capacity of the frame. In turn, it becomes possible to use a member with poor deformability as the beam member. So [7
FIG. 17 shows the case where the ultimate yield strength of the joint metal exceeds the total plastic yield strength of the beam, and FIG. 18 shows the case where the ultimate yield strength of the joint metal is less than the total plastic yield strength of the beam.

By using a material whose strength exceeds that of the beam, it is possible to create a joint that satisfies both proof stress and deformability.

Further, in the present invention, since there is a gap between the column 2 and the joint metal fitting 1, the generation of the elbow reaction force that occurs when a tensile force is applied is suppressed, and therefore the axial force borne by the bolt is reduced.

The above explanation assumes that the pillars are sufficiently strong compared to the beams and is based on the business entity, but the same can be said if the positions of the pillars and beams are swapped.

[Brief explanation of the drawing]

Figure 1'4-i is a perspective view of the joint metal fitting, Figure 2 is a detailed view of its usage, Figures 3 and 4 are explanatory diagrams of deformation of the frame, Figure 5
Figure 6 is an elevational view and a cross-sectional view of the installed state of the beam web,
Figures 7, 8 and 9 are elevational views and cross-sectional views of other beam webs installed, Figures 10A and B, Figure 11A,
B, FIGS. 12A and B, and FIGS. 13A and B are front and side views showing modified examples of the joining metal fittings, FIGS. 14, 15, and 16 are explanatory diagrams of the conventional example, and FIGS. 17 18 and 19 are explanatory diagrams of the present invention. ■...T-shaped hardware, 2...column, 3...beam, 4...board, 5
...Flange, 6.Gap holding part, 7.Bolt, 8.
・T-shaped hardware, 9..web plate, 10..bolt hole, 11..L
Shape hardware. Figure 5 Figure 7 Figure 8 Figure 10 A Figure 10 B Figure 11 A Figure 11 B Figure 12 A #; 12 1. A iB Figure 13 A
No. 13 Giant IB

Claims (1)

[Claims] One member is joined to the other member using a T-shaped metal fitting), and the substrate of the T-shaped metal fitting has a gap between the one member and the other member by a gap holding part, and A joint structure for a steel frame for a structure, characterized in that the substrate deforms when a load is applied to absorb energy due to the load.