JP2002038591A - Joint construction between column and beam in wooden construction - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joint construction between a column and a beam in a wooden construction for enhancing an energy absorbing capacity during an earthquake. SOLUTION: In a joint construction in which a column member 1 and a beam member 2 of the lumber is jointed together by means of a steel plate 3 and drift pins or bolts, and an energy absorbing portion 5 having a cross sectional area smaller than other portions between a joint portion to the column member 1 of the steel plate 3 and a joint portion to the beam member 2 is formed which can be yielded prior to the other portions when an external force has been applied.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting structure for connecting columns and beams in a wooden structure.

[0002]

2. Description of the Related Art In recent years, attention has been paid to the construction of large-scale wooden buildings, and particularly to the construction of high-rise wooden structures in large-scale large-scale wooden structures. Technology has not yet been developed. A method of realizing such a ramen structure is a moment joining method using a general drift pin.
That is, as shown in FIG. 4, the column member 1 and the beam member 2 made of wood have a joint structure of a column and a beam connected by a steel plate 3 cross-linked therebetween and a drift pin 4 penetrating therethrough. Things. In many cases, the steel plate 3 is provided embedded in the wood, and the drift pins 4 are provided by driving so as to penetrate the steel plate 3 and the wood portions on both sides thereof together.

[0003]

However, when a tall building (for example, about 5 to 7 floors) is intended,
As a countermeasure against earthquakes, it is necessary that the joint structure between the beam and the column has the ability to absorb (attenuate) energy associated with the earthquake.
From this point of view, in the conventional connection structure of columns and beams,
Lack of energy absorption capacity makes it difficult to increase the height of wooden structures.

[0004] That is, the rotational deformation due to the moment at the beam end is caused by the sinking of the wood together with the yielding of the drift pin.
The hysteresis shape of the deformation δ with respect to the horizontal load Q becomes a thin slip shape as shown in FIG. 3A, and the energy absorbing ability is poor.

Accordingly, an object of the present invention is to solve the above-mentioned problems and to provide a joint structure between a column and a beam in a wooden structure having excellent energy absorbing ability.

[0006]

Means for Solving the Problems To achieve the above object, the invention described in claim 1 is a joint for connecting a column member and a beam member in a wooden structure with a metal plate cross-linked therebetween. In the structure, a small cross-section having a smaller cross-sectional area than other portions is provided between a connection portion of the metal plate to the pillar member and a connection portion to the beam member.

According to this configuration, a small cross-sectional area having a smaller cross-sectional area than the other part is provided between the connecting part of the metal plate to the column member and the connecting part to the beam member. Is applied, the yield of the small cross-section portion precedes the yield at the connection portion of the metal plate to the column member and the beam member, so that the energy absorption capability of the metal plate is improved. In other words, the presence of the small cross-section reduces the relative deformation at the connection between the metal plate and the wood, so that the connection strength between the column and the beam is improved.

[0008] Therefore, according to the joint structure of the wooden pillars and beams, it is possible to absorb (attenuate) the energy at the time of the earthquake only with the metal plate, thereby realizing a high-rise wooden building. be able to.

Further, as described in the second aspect, the small cross-section portion is, specifically, a notch portion in which the width of a metal plate is reduced,
It can be provided in any form of an opening provided in the metal plate or a thin portion of the metal plate.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on the illustrated embodiment. FIG. 1 is a perspective view showing a connecting portion in which a column member 1 and a beam member 2 are joined by a steel plate 3 in a wooden structure according to an embodiment of the present invention, and FIG.
It is a front view of the coupling part shown in FIG.

As shown in FIG. 1, a strip-shaped rectangular steel plate 3 is provided on a wooden pillar member 1 so as to penetrate it.
The portions of the steel plate 3 protruding from both sides of the column member 1 function as engaging portions 3A and 3B for the beam member 2. On both sides of the column member 1, a wooden beam member 2 is in contact, and the engaging portions 3 </ b> A and 3 </ b> B of the steel plate 3 projecting laterally from the column member 1 are embedded in the beam member 2. The beam member 2 is configured to be hidden from the outside. For this purpose, the beam member 2 is provided with a groove (not shown) for fitting the engaging portions 3A, 3B of the steel plate 3 from the lower surface side.

As described above, the steel plate 3 bridges the column member 1 and the beam members 2 on both sides thereof while being embedded in these members. The steel plate 3 is joined to the column member 1 and the beam member 2 by driving the drift pin 4 through the column member 1 and the beam member 2 (drift pin joining). For this purpose, the steel plate 3, the column member 1 and the beam member 2 are provided in advance with small holes for press-fitting the drift pins.

[0013] Drift pin joining is a joining method in which a drift pin made of round steel is hammered into a tip hole of the same diameter or slightly smaller than this pin, and has an advantage that the initial slip can be reduced as compared with a bolt. is there.

Further, as described above, the steel plate 3 has a substantially band-like rectangular shape as a whole, and the steel plate 3 has a joint between the column member 1 and the beam member 2. According to the present invention, an energy absorbing portion 5 having a smaller sectional area than other portions of the steel plate 3 and yielding prior to other portions when an external force is applied is formed. In the case of the embodiment of FIG. 1, the energy absorbing portion 5
In the vicinity of the beam ends of A and 3B, a notch portion 6 is provided at both edges in the width direction of the steel plate 3 so as to narrow the width of the steel plate from both sides. Each is provided with a predetermined length.

In the above structure, notches 6 are provided at both ends in the width direction of the steel plate 3 at the beam ends to reduce the width of the steel plate, thereby forming a weak portion in the steel plate 3. In this case, the weak portion, that is, the narrow portion of the steel plate 3 acts as the energy absorbing portion 5. That is, the notch 6 of the steel plate 3 is more than the yield of the drift pin 4.
Since the yield of 先行 is earlier, the hysteresis shape of the deformation δ with respect to the repetitive force (horizontal load Q) during an earthquake becomes a spindle shape like S structure as shown in FIG. Therefore, the energy absorption ability is improved.

Therefore, according to the joint structure between the wooden pillar and the beam or the energy absorbing type wooden drift pin joining method,
It is possible to absorb (attenuate) the energy at the time of the earthquake only with the steel plate 3, and to realize a tall building of, for example, about 5 to 7 floors in a wooden building.

In addition, since the energy absorbing ability at the joint between the column member 1 and the beam member 2 is improved, the use of a diagonal member that absorbs energy due to breakage can be minimized. The use of diagonal materials causes design restrictions such as the inability to provide windows on the walls containing the diagonal materials.
In the present embodiment, such restrictions can be significantly reduced.

When the joining strength and rigidity of the drift pin portion are insufficient, as shown by reference numerals 3a, 3b and 3c in FIG. 2, the interface between the wood of the column member 1 and the beam member 2 and the steel plate 3 is formed. By injecting an adhesive such as epoxy or epoxy, the proof stress can be increased, and the hysteresis can be further improved.

In the above embodiment, the energy absorbing portion 5
Of the steel plate 3 was formed by a notch portion for reducing the width of the steel plate 3. However, the present invention is not limited to this. For example, a portion having a small cross-sectional area is formed by providing an opening portion in a plane in the steel plate 3 or providing a thin portion in the steel plate 3 to form an energy absorbing portion. 5 can also function.

In the above embodiment, the steel plate is connected to the column member and the beam member by the drift pin. However, the steel plate may be connected to the column member and the beam member by using bolts or other connecting means instead of the drift pin.

[0021]

As described above, according to the connection structure of the pillar and the beam in the wooden structure according to the present invention, the connection between the connection portion of the metal plate to the pillar member and the connection portion to the beam member is provided. The cross-sectional area is smaller than the other parts, so in the event of an earthquake, the cross-sectional area is smaller than the other parts and the strength is weaker than the yield of the joint of the metal plate to the column member and the bonding member. The yielding of the small cross section, which is the part, precedes. For this reason, the energy absorption capacity of the metal plate is improved, and a tall wooden building can be realized.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a joint structure between a column and a beam according to the present invention.

FIG. 2 is a front view showing a joint structure between a column and a beam according to the present invention.

FIGS. 3A and 3B are characteristic diagrams showing the energy absorption capacity of a joint structure of a column and a beam during an earthquake, wherein FIG. 3A shows a case where a steel plate has no cutout portion, and FIG. It is a figure showing the case where there is a part.

FIG. 4 is a front view showing a conventional joint structure between a column and a beam.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Column member 2 Beam member 3 Steel plate 3A, 3B Engagement part 4 Drift pin 5 Energy absorption part 6 Notch part

Claims (2)

[Claims] 1. A connecting structure in which a pillar member and a beam member in a wooden structure are connected by a metal plate cross-linked therebetween, wherein a connecting portion of the metal plate to the pillar member and the beam member are connected to each other. A small cross-section having a smaller cross-sectional area than the other portion is provided between the column and the beam. 2. The metal sheet according to claim 1, wherein the small cross-section comprises one of a cut-out portion having a reduced width of the steel plate, an opening provided in the metal plate, and a thin-walled portion of the metal plate. 2. A connection structure between the column and the beam according to 1.