JPH0643709B2 - Column-beam joint structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a column-beam joint structure including a steel beam and a concrete column.

[Problems to be Solved by the Invention] Although bolt joints are generally used to join steel beams and columns, in conventional split tees, end plate joints, etc., since bolts are attached to the upper and lower positions of the steel beam flanges, flanges When tension is applied to the bolt, bending occurs in the beam forming direction between the bolt and the flange, and in order to cope with this, the number of bolts inevitably increases, which makes the joint and construction complicated.

The present invention was made based on the actual situation of a joint structure using steel beams, and is intended to newly propose a joint structure having a simple structure.

[Means for solving problems]

In the present invention, the end plate is formed to be larger than the cross-sectional area of the steel beam flange, the bolt holes are arranged on both outer sides of the flange, and the center of the bolt hole is located on or near the center line of the flange to join the concrete column. The structure will be simplified and the construction will be simplified.

The end plate is longer than the flange width, and the distance between the bolt holes formed on each side of the end plate is also larger than the flange width, and is joined to the upper and lower flange end surfaces of the steel beam.

The center of the bolt hole of the end plate is located on or near the center line on the cross section of the flange, and on the elevation, the axis of the bolt coincides with the direction of the force acting on the flange. Since the axis of the bolt that passes through the end plate is located on the center line of the flange, there is no bending in the beam forming direction on the end plate, the force transmission from the steel beam to the column is smooth, and the number of bolts used Is reduced and the connection is simplified.

The steel beam to which the end plates are joined is placed against the side surface of the concrete column, and two bolts are inserted between the two end plates facing each other at a distance, and the end plates are connected to each other. By doing so, it is joined to the concrete pillar.

〔Example〕

 The present invention will be described below with reference to the drawings illustrating an embodiment.

The column-beam joint A of the present invention is constructed by connecting end plates 3 and 3 joined to a flange 1a of a steel beam 1 to each other with bolts 4 and joining the steel beams 1 and 1 to a concrete column 2. Is.

As shown in FIG. 1-I, the end plate 3 is joined to the upper and lower flanges 1a, 1a of the steel frame beam 1, and bolt holes 3a, 3a are opened at two positions on both sides thereof. The end plate 3 is formed in such a size that the bolt holes 3a, 3a are located on both outer sides of the flange 1a.

The center of the bolt hole 3a is located on or near the center line of the cross section of the flange 1a as shown in the drawing, and the axis of the bolt 4 is located in the same plane as the flange 1a. Bolt 4
As a result of the fact that the axis line of is located in the plane of the flange 1a, the occurrence of bending in the beam forming direction with respect to the end plate 3 is avoided, and the force transmission from the steel frame beam 1 to the columns 2 and the opposing steel frame beam 1 is performed smoothly. Be seen.

As shown in FIG. 1-I, the steel frame beams 1 and 1 in which the end plates 3 and 3 are joined to the flanges 1a and 1a are arranged to face the side surface of the concrete column 2, and the facing end plates 3 and 3 are connected to each other. It is joined to the concrete column 2 by connecting with bolts 4 and 4.

FIG. 1 shows an embodiment in which the concrete pillar 2 is cast-in-place concrete.

In this case, the steel beams 1 and 1 are installed so that the end plates 3 and 3 bite into the concrete pillar 2, and the bolts 4 and 4 are inserted between the end plates 3 and 3 facing each other, and the nuts 5 and 5 are tightened. Concrete is poured after the end plates 3 and 3 are connected. At this time, the nuts 5 and 5 are additionally tightened if necessary.

By the way, when a large tensile force acts on the flange 1a and a large bending occurs in the width direction of the flange 1a between the position of the bolt hole 3a of the end plate 3 and the side surface of the flange 1a, as shown in FIG. Ribs 3 at the top and bottom of
By projecting b and 3b, the end plate 3 can be stiffened against bending, and an increase in its thickness can be suppressed.

In this case, as shown in FIGS. 2 and 3, the end plate 3 is provided with flanges 3c and 3c which are continuous with the ribs 3b and 3b on the flange 1a side of the bolt holes 3a and 3a. 3 is joined to the end face so as to sandwich the flange 1a in the width direction.

FIG. 3 shows an example of use of the end plate 3 in which ribs 3b, 3b and a flange 3c are provided around the bolt hole 3a, and the concrete column 2 is precast concrete.

For precast concrete columns, concrete columns 2
A sheath 6 that previously forms a bolt insertion hole is embedded in the insertion position of the bolt 4 inside, and the bolt 4 is inside the sheath 6 after the end plate 3 joined to each steel frame beam 1 is abutted against the side surface of the concrete column 2. Inserted into the nuts 5, 5
The end plates 3 and 3 are crimped to the concrete column 2 by tightening, and the steel beams 1 and 1 are joined to the concrete column 2.

FIG. 4 and FIG. 5 particularly show a structural example of the column-beam joint portion A in the outer peripheral portion of the building. Fig. 4 shows the case of cast-in-place concrete columns, and Fig. 5 shows the case of precast concrete columns.

In the case of cast-in-place concrete pillars, concrete pillar 2
The end plate 3 of the steel beam 1 facing the surface to which the steel beam 1 is not connected is embedded in the concrete column 2 together with the nut 5 as shown in FIGS. The fixing plate 7 having the same shape as the end plate 3 is connected by bolts 4 and nuts 5.

In the case of a precast concrete pillar, as shown in FIG. 5, it is connected by a bolt 4 and a nut 5 to a fixing plate 7 which is abutted against the side surface of the concrete pillar 2.

〔The invention's effect〕

The present invention is as described above, the end plates that are formed to be larger than the cross-sectional area of the steel beam flange, the bolt holes are located on both outer sides of the flange, and the centers of which are located on or near the center line of the flange are bolted to each other. Since the steel beam is joined to the concrete column by connecting with, the occurrence of bending in the beam forming direction to the end plate is avoided, and the force transmission from the steel beam to the column becomes smooth. The number of bolts can be reduced, and the joint structure can be simplified.

Further, since the steel frame beam is installed so as to face the pillar and is joined by simply connecting the end plates with bolts, the workability is improved and the construction period can be shortened.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of the present invention, in which I is a sectional view showing a state where an end plate is joined to a steel beam, II is a transverse sectional view of a joint, and III is Fig. 3 is a longitudinal sectional view, Fig. 2 is a perspective view showing a part of an end plate having ribs projecting, Fig. 3-
I and II are cross sectional views and longitudinal cross sectional views showing other embodiments, respectively, and FIGS. 4 and 5 show the embodiment in the outer peripheral column. FIGS. A plan view and FIG. 4-II are longitudinal sectional views. A: Column-beam connection, 1 ... Steel beam, 1a ... Flange, 2 ... Concrete column, 3 ... End plate, 3
a: Bolt hole, 3b: Rib, 3c: Flange, 4
...... Bolt, 5 ... Nut, 6 ... Sheath, 7 ... Fixing plate

Claims (1)

[Claims] 1. A steel frame beam having a flange width that is longer than the flange width, one bolt hole is provided on each side, the distance between the bolt holes is greater than the flange width, and the center of the bolt hole is located on or near the center line of the flange. The steel beams whose end plates are joined to the end faces of the upper and lower flanges are placed in abutment with the sides of the concrete column, and bolts are inserted between the bolt holes of the end plates facing each other at a distance to connect the end plates to each other. A column-beam joint structure made by joining steel beams to concrete columns.