JP2000352153A - Steel pipe column structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To curb significantly costs by increasing the thickness of a spot on which the strut stress of a steel pipe column acts in a steel pipe column structure having an earthquake resistant wall. SOLUTION: A steel pipe structure having earthquake resistant walls is formed by thickening the connection between a concrete-filled steel pipe column 1 and a beam 2 and a spot 3 on which the strut stress due to a compression strut F acts. Subsequently, a pair of guide plates corresponding to the thickness of the earthquake resistant wall is suspended in the connection between the column 1 and the earthquake resistant wall and many headed studs are planted between the guide plates. At this occasion, the tips of the guide plates are made higher than the stud heads, and even if a crack occurs along the stud heads in the earthquake resistant wall, the crack is covered with the guide plates to prevent concrete from separating, whereby the steel pipe connection can be reinforced without using a diaphragm, and as the conveyability and fillability of concrete can be improved, cost can be reduced significantly and the stiffness of the connection can be secured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a steel pipe column structure. More specifically, the present invention relates to a steel pipe column structure having a desired seismic resistance despite its simplified structure.

[0002]

2. Description of the Related Art Conventionally, there has been known a construction method of constructing a structure such as a building by combining steel pipe columns and earthquake-resistant walls, that is, a so-called earthquake-resistant wall construction method.

[0003] In a structure constituted by using the earthquake-resistant wall w, as shown in FIG. 8, a compressive strut f is formed in the wall w by a horizontal load at the time of an earthquake, whereby a compressive force or a tensile force ( Hereinafter, referred to as strut stress) occurs in the wall surface w. This strut stress acts on the joint between the steel pipe column a and the beam (built-in beam) b and its vicinity.

[0004] The joint of the steel pipe column a is generally reinforced by a diaphragm c as shown in FIG. When the steel pipe column a is reinforced by the diaphragm c, operations such as cutting of the steel pipe column a, setting of the diaphragm c, and joining of the steel pipe column a and the diaphragm c by welding are required. However, there is a problem that the cost of the steel pipe column a is increased.

When the steel pipe column a is a concrete-filled column, that is, a so-called CFT column, the concrete is filled through the hole e provided in the diaphragm c. In order to prevent plugging of the concrete by the diaphragm c, high-quality filled concrete is required, and it is necessary to pay close attention to quality control (for example, voids under the diaphragm). Therefore, concrete cost and construction cost increase.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-mentioned problems of the prior art, and has as its object to provide a steel pipe column structure which can obtain a desired earthquake resistance without using a diaphragm. I have.

[0007]

A first embodiment of a steel pipe column structure according to the present invention is a steel pipe column structure having an earthquake-resistant wall, the steel pipe column having a thickened portion where a strut stress acts. , And is characterized by comprising:

In the first embodiment of the steel pipe column structure of the present invention, it is preferable that a guide member corresponding to the above-mentioned earthquake-resistant wall is disposed on a joint surface of the steel pipe column with the earthquake-resistant wall. More preferably, the tip is located forward of a head of a stud provided on the steel pipe column.

A second embodiment of the steel pipe column structure according to the present invention is a so-called ramen braced structure having a brace, in which a portion where a stress from the brace acts acts to increase the wall thickness. It is characterized by being constituted using a steel pipe column.

[0010]

Since the present invention is constructed as described above, the production of the steel pipe column is simplified and the production cost is significantly reduced. Also, since there are no protrusions inside the steel pipe column,
When the CFT column is used, the pumpability and the filling property of the concrete are improved and the quality control of the concrete is simplified, so that the cost of the steel pipe column structure using the CFT column is significantly reduced.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described based on embodiments with reference to the accompanying drawings, but the present invention is not limited to only such embodiments.

Embodiment 1 A steel pipe column structure K1 according to Embodiment 1 of the present invention is shown in a front view in FIG. 1 and in a plan view in FIG. In the steel pipe column structure K1, the thickness of the joint 3 of the steel pipe column (CFT column) 1 with the beam (built-in beam) 2 and the portion 3 where the strut stress is exerted by the compression strut F is increased by thickening. The steel pipe column 1 is reinforced by the above. Various conventionally known methods can be applied to this thickening process, and the method is not particularly limited.

In order to simplify the construction of the steel pipe column 1, as shown in FIG. 3, a pair of guide plates 5 and 5 are provided on the joint surface of the steel pipe column 1 with the earthquake-resistant wall 4 so that the thickness of the wall 4 is increased. And the guide plates 5
A large number of headed studs 6 are implanted between the five at a predetermined pitch (see FIG. 1). The guide plate 5 also has a function of preventing rainwater and noise from entering the room from the boundary between the steel pipe column 1 and the earthquake-resistant wall 4.

In the drawings, reference symbol C indicates concrete.

As described above, in the first embodiment, the steel pipe column 1
Is strengthened by using a thickening process without using a diaphragm, so that the manufacturing period of the steel pipe column 1 is shortened and the cost is significantly reduced. Also,
Since there are no protrusions inside the steel pipe column 1, the pumpability and filling property of the concrete are improved. This simplifies the quality control of concrete and significantly reduces construction costs. Furthermore, the rigidity of the joint is ensured,
Even if the shear failure occurs in the earthquake-resistant wall 4 and the tensile stress of the built-in beam 2 rapidly increases, the joint does not protrude.

Embodiment 2 FIG. 4 shows a main part of a steel pipe column structure K2 according to Embodiment 2 of the present invention. The second embodiment is a modification of the first embodiment, in which the tip 5a of the guide plate 5 is positioned forward of the head 6a of the stud 6, as shown in FIG. This is done for the following reasons. According to the horizontal loading test of the present inventors, FIG.
As shown in FIG. 5, it has been found that when a horizontal force of a certain degree or more is applied, a crack V along the head 6a of the stud 6 occurs on the earthquake-resistant wall 4. If a horizontal load is repeatedly applied in this state, the concrete around the stud 6 is peeled off due to the crack V, and the strength of the earthquake-resistant wall 4 is reduced. Therefore, the portion where the crack V is likely to occur is covered with the guide plate 5 so that the strength is not reduced by the peeling of the concrete.
In FIG. 5, reference symbol H indicates a shear crack generated in the earthquake-resistant wall 4.

The remaining configuration of the second embodiment is the same as that of the first embodiment.

As described above, in the second embodiment, since the tip 5a of the guide plate 5 is located ahead of the head 6a of the stud 6, the stud head 6a
Is formed, the crack V will be covered by the guide plate 5, so that the concrete (the hatched portion in FIG. 5) in this portion is prevented from peeling off. Therefore, a decrease in strength due to concrete peeling is also prevented.

Embodiment 3 FIGS. 6 and 7 show a steel tube column structure (ramen brace structure) K3 according to Embodiment 3 of the present invention. The third embodiment is a modification of the first embodiment, in which a steel pipe column 1 subjected to a wall-thickening process is applied to a structure having a brace structure. That is, in addition to the joint between the steel pipe column 1 and the beam 7, the thickness of the portion where the compressive stress or tensile stress from the brace 8 acts is also increased.

As described above, in the third embodiment, since the brace-joining portion of the steel pipe column 1 is also subjected to the thickening process,
There is no need to attach a reinforcing material to the brace joints of the steel pipe column 1, and the configuration of the steel pipe column 1 is simplified.

As described above, the present invention has been described based on the embodiments. However, the present invention is not limited to only such embodiments, and various modifications are possible. For example, the steel pipe column in the third embodiment may be a CFT column.

[0022]

As described above, according to the present invention, the following excellent effects can be obtained.

(1) The structure of the joint of the steel pipe column is simplified,
The production time of the steel column is shortened, and the cost of the steel column is significantly reduced.

(2) When CFT columns are used, the pumpability and filling property of concrete are improved, the quality control of concrete is simplified, and the construction cost is significantly reduced.

[Brief description of the drawings]

FIG. 1 is a front view of a steel pipe column structure according to Embodiment 1 of the present invention.

FIG. 2 is a plan view of the same.

3A and 3B are views showing a joint between the steel pipe column and the earthquake-resistant wall in the first embodiment, wherein FIG. 3A shows a front view and FIG. 3B shows a cross-sectional view.

FIG. 4 is a sectional view of a main part of a steel pipe column structure according to a second embodiment of the present invention.

FIG. 5 is a schematic diagram showing a state in which a shear crack and a crack along a head of a stud have occurred in an earthquake-resistant wall.

FIG. 6 is a front view of a steel pipe column structure according to Embodiment 3 of the present invention.

FIG. 7 is an enlarged view of a joint according to the third embodiment.

FIG. 8 is a front view of a conventional steel pipe column structure.

FIG. 9 is an enlarged view of a joint of a conventional steel pipe column structure.

[Explanation of symbols]

 Reference Signs List 1 steel pipe column, CFT column 2 beam (built-in beam) 3 place of strut stress 4 earthquake-resistant wall 5 guide plate 6 stud with head K steel pipe column structure C concrete

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) E04H 9/02 311 E04H 9/02 311 321 321B

Claims (4)

[Claims] 1. A steel pipe column structure having an earthquake-resistant wall, wherein the steel pipe column structure is constituted by using a steel pipe column whose wall thickness is increased at a position where a strut stress acts. 2. The steel pipe column structure according to claim 1, wherein a guide member corresponding to the earthquake-resistant wall is disposed on a joint surface of the steel pipe column with the earthquake-resistant wall. 3. The steel pipe column structure according to claim 2, wherein a tip end of the guide member is located forward of a head of a stud provided on the steel pipe column. 4. A steel pipe column structure having a brace, wherein the steel pipe column structure is constituted by using a steel pipe column having a wall-thickness-processed portion where a stress from the brace is applied. .