JP2000204657A - Column-to-beam joint structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a column-to-beam joint structure capable of decreasing disadvantages of a beam in terms of strength at the time of short-term load application during an earthquake, while capable of restraining deflection of the beam under long-term load. SOLUTION: A beam 2 comprises a steel pipe 5 filled with concrete 6. In this case, adhesion between the concrete 6 and the steel pipe 5 is cut. Tension members 3 are passed through the filling concrete 6 and made to penetrate a column 1 and project out of a side face opposite to the beam 2 across the column 1, with end plates 9 attached to their projecting ends. Tensile forces applied to the tension members 3 introduce compressive prestresses into the concrete 6 filling the beam 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a joint structure between a column and a beam.

[0002]

2. Description of the Related Art Heretofore, there has been known a beam using a prestressed concrete structure as a beam to be joined to a column. The main purpose of the pre-stress in this case is to suppress the deflection of the beam under long-term load, but the existence of compressive stress in the beam is disadvantageous in terms of strength when a short-term load is applied such as during an earthquake. is there.

[0003] In view of the above problems, the present invention is capable of suppressing the deflection of a beam to a long-term load,
Moreover, an object of the present invention is to provide a joint structure between a column and a beam that can reduce the disadvantage of the strength of the beam when a short-term load is applied such as during an earthquake.

[0004]

An object of the present invention is to provide a concrete structure in which a beam is filled in a steel pipe, and a tension member is passed through the filled concrete. It is projected from the side opposite to the beam with the end sandwiched, and this projected end is provided with an end plate, and the compressive prestress is introduced into the concrete filled with the beam by the tensile force applied to this tendon It is solved by a joint structure of a column and a beam characterized by the following.

That is, in this structure, the beam is made of steel pipe filled with concrete, and the pre-stress of the conventional pre-stressed concrete structure is applied to the filled concrete because compressive pre-stress is introduced by the tendon. Similarly to the beam, it is possible to suppress the deflection of the beam against a long-term load.

In addition, since this concrete is filled in a steel pipe, it can be restrained by the steel pipe by introducing a compressive pre-stress and can be brought into a three-dimensional stress state. The compressive strength of concrete is increased. This allows the beam
It is possible to reduce a disadvantage in strength at the time of a short-term load action such as an earthquake. Also, the beam cross section can be reduced by the confined effect.

In addition, a tendon material penetrates the column, protrudes from the side opposite to the beam across the column, and is provided with an end plate at the protruding end. Because prestress is introduced,
The introduction of prestress can be easily performed in relation to the pillar.

In particular, when the filling concrete and the steel pipe are cut off from each other in the beam, the compressive pre-stress can be effectively introduced only into the filling concrete, and the beam can be subjected to a long-term load. Of the beam can be more effectively suppressed, and the disadvantage of the strength of the beam when a short-term load is applied, such as during an earthquake, can be reduced more effectively.

[0009] In addition, the tendon material passed through the filled concrete penetrates the column and projects from the side opposite to the beam across the column. When the column is sandwiched between the concrete and end plate of the beam and the beam and the column are joined by the applied tensile force, the prestress is introduced into the concrete by applying a tensile force to the tendon. And joining of the column and the beam can be performed at the same time, and the construction can be performed efficiently. In addition, when it is not sufficient in terms of strength to make the joining between the beam and the column dependent only on the tendon, it goes without saying that additional joining means may be provided.

[0010]

Next, embodiments of the present invention will be described with reference to the drawings. In the structure of the embodiment shown in FIGS. 1 and 2, 1 is a column, and 2 is a beam.

The column 1 has a reinforced concrete structure, and the column 1 has holes 4 through which tendon members 3 for introducing prestress are passed therethrough.

The beam 2 is a rectangular steel pipe 5 filled with concrete 6. An anti-adhesion agent 7 such as asphalt is applied to the inner peripheral surface of the steel pipe 5 so that the steel pipe 5 and the filled concrete 6 adhere to each other. Is cut off. Reference numeral 8 denotes a hole for filling concrete.

A sheath tube 14 is passed through the filled concrete 6 of the beam 2, and the sheath tube 14 projects outward from the end face of the column of the beam 2.
Are extended inward of the through holes 4. And beam 2
A first end plate 9 is installed on the end face of the column, and a second end plate 10 is installed on the side of the column opposite to the beam 2 with the column 1 interposed therebetween. Sheath tube 1 so as to penetrate
4 are passed through the tension members 3, and the female screw members 11 as fixing devices are screwed to the ends of the tension members 3 outside the end plates 9, 10, and tightened. Power has been imparted.

Due to the tensile force applied to the tendon 3, the concrete 6 filled in the beam 2 is sandwiched between the first end plate 9 and the column 1, and a compressive prestress is introduced. In addition, the end face of the steel pipe 5 constituting the beam 2 is separated from the column 1 by some distance so that the beam end collapses.

It is general that the concrete of the column 1 and the concrete 6 of the beam 2 are integrally cast in terms of construction, economy and the like. However, for the reinforced concrete column 1 formed by concrete casting, the steel pipe 5
The steel pipe 5 is filled with concrete 6, and a tensile force is applied to the tension members 3.
May be sandwiched between the filled concrete 6 and the second end plate 10, thereby joining the beam 2 and the column 1. In this case, applying tension to the tendon material 3 to introduce prestress into the filled concrete 6,
The advantage of joining the beam 2 and the column 1 is obtained.

In the above-mentioned structure, the beam 2 is made of steel pipe 5 filled with concrete 6 and the pre-stress of compression is introduced into the filled concrete 6 by the tendon material 3. Like the beam of the prestressed concrete structure, the deflection of the beam 2 against a long-term load can be suppressed. Moreover, the filled concrete 6 is restrained by the steel pipe 5 by introducing a compressive prestress, and
Since the compressive strength is increased by the confined effect due to the dimensional stress state, the beam 2 can effectively and effectively withstand a short-term load action such as an earthquake.
In particular, since the adhesion between the filled concrete 6 and the steel pipe 5 is cut off by the adhesion preventing agent 7, the compressive prestress can be effectively introduced only into the filled concrete 6. In addition, the tension member 3 penetrates the column 1 and protrudes from the side opposite to the beam 2 with the column 1 interposed therebetween. At that portion, the female screw member 11 is tightened to fill the concrete 6 in the steel pipe 5.
Since the construction is such that a compressive prestress can be introduced into the concrete, the prestress can be easily introduced into the filled concrete 6 in relation to the column 1.

Further, the beam 2 is provided with concrete 6 in the steel pipe 5.
, The refractory coating on the beam 2 can be omitted, and the cost can be reduced and the construction period can be shortened. In addition, the steel pipe 5 can be used as a mold, which can reduce the cost of the mold and further shorten the construction period. In addition, steel pipe 5
Can reduce the amount of shear reinforcement of beam 2, and even if the reinforced concrete beam is sheared,
The beam does not collapse.

An embodiment of the present invention has been described above.
The present invention is not limited to this, and various modifications can be made without departing from the spirit of the invention. For example, in the above embodiment, the column 1 is a column having a reinforced concrete structure, but may be a so-called concrete-filled steel tube (CFT) column in which concrete is filled inside a steel tube. It may be composed of pillars having the following structure. Also, in the drawing, the state where the beam 2 is joined to the column 1 in a cantilever state is drawn, but it goes without saying that the reinforced concrete beam may be integrally extended from the free end of the beam 2 or may be extended. Nor. In addition, as shown in the drawing, reinforcing concrete 13
May be made, or the reinforcing bar 13 may not be made in some cases. Further, as the steel pipe 5 of the beam 2, steel pipes having various cross-sectional shapes may be used.

[0019]

As described above, since the joint structure between a column and a beam according to the present invention has the above-described structure, it is possible to suppress the deflection of the beam to a long-term load, and furthermore, It is possible to reduce the disadvantage of the strength of the beam when a short-term load is applied.

[Brief description of the drawings]

FIG. 1 is a sectional front view showing the structure of an embodiment.

2A is a cross-sectional view taken along the line II of FIG. 1, FIG. 2B is a view taken along the line II-II of FIG. 1, and FIG.
FIG. 3 is a view taken along line III.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Column 2 ... Beam 3 ... Tensile material 4 ... Through-hole 5 ... Steel pipe 6 ... Filled concrete 7 ... Anti-adhesion agent 10 ... 2nd end plate 11 ... Female screw member (fixing tool)

Continued on front page F term (reference) 2E125 AA04 AA14 AB12 AC01 AC05 AC07 AC16 AC29 AG02 AG04 AG12 AG31 AG43 AG60 BA02 BA22 BB02 BB08 BB21 BB30 BD01 BE02 BE07 BE08 BF04 CA04 CA09 CA13 CA14 CA80 EA01 EA16 EA17 EA35 EB01

Claims (3)

[Claims] 1. A beam is made of a steel pipe filled with concrete, and a tension material is passed through the filled concrete. The tension material penetrates a column, and is inserted from a side opposite to the beam across the column. The projecting end is provided with an end plate, and a compressive prestress is introduced into the concrete filling of the beam by a tensile force applied to the tendon material. Construction. 2. The joint structure between a column and a beam according to claim 1, wherein the filled concrete and the steel pipe are cut off from each other in the beam. 3. The column according to claim 1, wherein the column is sandwiched between the concrete filling of the beam and the end plate by the tensile force applied to the tendon, and the beam and the column are joined. And beam joint structure.