JPH04143341A - Connecting part construction of beam and pillar - 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) The present invention relates to a column-beam joint structure in which a square steel pipe column and a steel beam are joined by passing the column through the joint.

(Problem to be Solved by the Invention) When constructing a joint between a square steel pipe column and a steel beam by penetrating the column, there are Because of the need for stress transmission, the diaphragm is inserted horizontally as shown in FIG.

The structure in which this diaphragm is arranged requires a great deal of manufacturing effort because the pillars are first cut at the position where the diaphragm is placed, and the pillars are welded and connected after the diaphragm is installed. Furthermore, when columns are made of steel pipe concrete, there are problems such as poor filling of concrete near the joints due to the diaphragm.

Furthermore, the stress transmission mechanism of the joints is structurally complex, and many parts remain unclear.

This invention was made based on the actual situation of the pillar-penetrating joint using such a diaphragm, and aims to propose a new structure that solves the above problems.

[Means to solve the problem]

In the present invention, instead of a diaphragm, a joining metal fitting is placed at the flange position of the steel beam so as to circumscribe the side surface of the column, and a gusset plate is installed at the web position and protrudes along the web to connect the column and the steel beam. This method eliminates the need for diaphragm placement and solves problems associated with construction workability and construction accuracy.At the same time, the bending moment from the steel beam is transferred to the column via the band plate of the joining metal that goes around the column. By transmitting it as a bearing force to the tension side, stress concentration on the tension side is avoided.

The joining hardware consists of a band plate that goes around the outer periphery of the column, and a mounting plate that is integrated with this band plate and extends out to the steel beam side, overlapping the flange of the band plate. bolted together.

The tensile force (bending moment) from the steel beam is borne by the metal joints connected to the flanges, and the shear force is borne by the gusset plates connected to the webs, and transmitted to the columns. By dividing the resistance mechanism in this way, the stress transmission mechanism of the joint becomes clear.

〔Example〕

The present invention will be explained below based on the drawings showing one embodiment.

As shown in FIG. 1, this invention connects a rectangular steel pipe column 1 and a steel beam 2 using a joining metal fitting 3 circumscribing the column 1 and a gusset plate 4 protruding from the outer peripheral surface of the column 1. It is.

As shown in FIG. 1, the joining hardware 3 includes a band plate 3a that circumscribes and circumscribes the side surface of the column 1, and this band plate 3.
a, and then extend horizontally to the steel beam 2 side.
The mounting plate 3b has bolt holes and is arranged at the upper and lower flanges of the steel beam 2.

After the joint hardware 3 is installed in a predetermined position, a filler 5 is filled in the gap between the inner peripheral surface of the band play 3a of the joint hardware 3 and the outer peripheral surface of the column 1 as necessary to prevent rattling. and the two are connected by this filler 5. A highly fluid resin adhesive is used for the filler 5, and is determined by taking into account the stress determined by the load and pressure-bearing area at the joint, but it only needs to have compressive strength. Therefore, there is a wide range of choices.

Since this joining hardware 3 is not structurally joined to the column 1, it bears only the tensile force and bending moment from the steel beam 2, but not the shearing force.

Gusset plate 4 connects steel beam 2 between joint metal fittings 3 and 3.
It is placed along the web of the column 1 and protrudes by welding directly to the column 1, or by penetrating the side surface and welding it as shown by the broken line in FIG. Bolt holes are also formed in the gusset plate 4.

The steel beam 2 is bolted to a mounting plate 3b of a metal joint 3 and a gusset plate 4, and its tensile force (bending moment) is transmitted to the column 1 only by the metal joint 3, and the shear force is transmitted only by the gusset plate 4.

Figure 5 shows the stress transmission mechanism at the joint, where the tensile force from the flange of the steel beam 2 flows to the opposite side via the band play (3a) surrounding the column 1; It is transmitted as bearing force.

As a result, stress is not concentrated on the side surface (flange) of the column 1, no local deformation is caused thereto, and the stress transmission mechanism becomes clear.

By this stress transmission mechanism, when the inside of column 1 is filled with concrete to make it a steel pipe concrete structure and is subjected to high axial force (compressive force), local tensile stress is generated in the rectangular steel pipe of column 1. It becomes possible to transmit the stress from the steel beam 2 to the column 1 without causing any damage, and the strength of both the square steel pipe and the concrete of the column 1 can be fully demonstrated.

Figure 2 shows how it will fit when Column 1 is the center column, but when it is a corner column it will fit as shown in Figure 3, and when it is a side column it will fit as shown in Figure 4. The mounting plate 3b of the hardware 3 is provided in a protruding manner on the side to which the steel beam 2 is connected.

FIG. 6 shows an example of the construction procedure for the joint.

For convenience of transportation, the pillar 1 of one unit needs to have fewer protrusions, so it is delivered to the site with only the gusset plate 4 attached (1), and the joining metal fittings 3 are temporarily attached before it is erected (ff). .

After the column 1 is erected, connect the steel beam 2 to the gusset plate 4 [II], then insert the joining hardware 3 on the upper flange side of the steel beam 2, and connect the upper and lower joining hardware 3°3 to the flange of the steel beam 2. Joint IV), filler 5 between joint hardware 3 and pillar 1
The construction of the joint is completed.

〔Effect of the invention〕

The present invention is as described above, and the bending moment of a steel beam is transmitted to the column by the joint metal fittings circumscribing the column, and the shear force is transmitted to the column by the gusset plate. In particular, tensile force and bending moment are transmitted to the column as bearing force. Therefore, stress is not locally applied to the side of the column, and the stress transmission is reliable and the mechanism becomes clear.

In addition, since the joint hardware does not penetrate the column, the structure of the joint is simplified and the construction is also simplified. At the same time, when the column is made of steel pipe concrete, the filling properties of the concrete and the workability are good.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an embodiment of the present invention, Fig. 2 is a plan view thereof, Figs. The figure is a plan view showing the stress transmission mechanism, Figure 6-1 to ■ are schematic diagrams showing the construction procedure,
FIG. 7 is a perspective view showing a conventional structure. 1... Column, 2... Steel beam, 3...
...Joining hardware, 3a...Band plate, 3b
...Mounting plate, 4...Gusset plate, 5...Filler. 6th

Claims (1)

[Claims] (1) Connecting a square steel pipe column and a steel beam, a joining hardware is placed at the flange position of the steel beam and circumscribed on the side of the column, and a gusset is installed at the web position of the steel beam along the web. The joint structure consists of a band plate that goes around the outer periphery of the column, and a mounting plate that is integrated with this band plate and extends to the steel beam side, and overlaps the flange of the band plate. This is a column-beam joint structure characterized in that the steel beam is bolted to the mounting plate and gusset plate of the joint hardware.