JP7750720B2 - Shear wall structure - Google Patents

Description

The present invention relates to a structure including a plurality of earthquake-resistant panels arranged in parallel along the horizontal direction within the structural surface of a column-beam frame, with upper and lower ends joined to the upper and lower beams,
and tension members arranged between adjacent ones of the plurality of earthquake-resistant panels and connecting the upper and lower beams to each other.

A known conventional earthquake-resistant wall structure uses earthquake-resistant panels made of cross-laminated wooden boards (see, for example, Patent Document 1).
The shear wall structure of Patent Document 1 comprises multiple seismic panels arranged horizontally within the structural plane of a beam-column frame, and tension members disposed between adjacent seismic panels. In this shear wall structure, the upper and lower ends of the seismic panels are joined to the upper and lower beams, respectively, to transmit shear forces between the upper and lower beams and the seismic panels. Furthermore, non-shrinkage mortar or concrete is filled between the upper and lower beams and the seismic panels, thereby transmitting compressive forces from the seismic panels to the upper and lower beams. This constraining of the seismic panels by the upper and lower beams creates rotational resistance in the seismic panels, thereby increasing the horizontal rigidity of the frame. Furthermore, because the seismic panels do not have tension joints, diagonal compressive forces connecting the corners of the seismic panels are dominant in the stress state. Therefore, by connecting the upper and lower beams with tension members disposed between adjacent seismic panels, the overall stress state resembles that of a truss structure, with the seismic panels functioning as diagonal compression members and vertical tension members, allowing the structure to function as a seismic element.

Furthermore, in the earthquake-resistant wall structure of Patent Document 1, a pair of earthquake-resistant panels are arranged on either side of a tension member, spaced apart from each other with a space in which the tension member is placed, and in order to conceal the tension member from the spaces in front and behind it and enhance its aesthetic appeal, finishing materials are retrofitted to the front and rear of the tension member by fitting them into the side edges of the pair of earthquake-resistant panels.

Japanese Patent Application Laid-Open No. 2020-101052

In the earthquake-resistant wall structure of Patent Document 1, finishing materials must be retrofitted in front and behind the tension members to conceal them from the spaces in front and behind them in order to improve aesthetic appeal, which creates the problem of increased effort and cost for the finishing work.
In view of this situation, the main object of the present invention is to provide a technology for improving the aesthetic appearance of a seismic wall structure comprising a plurality of seismic panels arranged in parallel along the horizontal direction within the structural surface of a column-beam frame, with each upper and lower end joined to the respective upper and lower beams, and tension members arranged between adjacent pairs of the seismic panels to connect the respective upper and lower beams, by concealing the tension members from the spaces in front and behind them without incurring any effort or cost.

The first characteristic configuration of the present invention is a plurality of earthquake-resistant panels arranged side by side along the horizontal direction within the structural surface of a column-beam frame, with upper and lower ends joined to the upper and lower beams, respectively;
tension members arranged between adjacent ones of the plurality of earthquake-resistant panels and connecting the upper and lower beams to each other;
A shear wall structure comprising:
The seismic panel has a side end portion on the tension member side, and an extension piece portion is formed integrally with the surface layer, the extension piece portion being formed by extending a surface portion corresponding to the surface layer on one side of the seismic panel laterally beyond the other portion that is not the surface portion ,
In a pair of seismic panels, one side seismic panel and the other side seismic panel, which are arranged on both sides of one of the tension members,
The extension piece formed on the one-side earthquake-resistant panel covers the front side, which is the front side of the tension member in a front view along the thickness direction of the earthquake-resistant panel, and extends toward the side end of the other-side earthquake-resistant panel in a state separated from the side end of the other-side earthquake-resistant panel,
The extending piece formed on the other side earthquake-resistant panel covers the rear side, which is the back side of the tension member when viewed from the front , and extends toward the side end of the one side earthquake-resistant panel while being separated from the side end of the one side earthquake-resistant panel.

According to this configuration, the tension member provided between the adjacent one-side seismic panel and the other-side seismic panel can be concealed from the front and rear spaces by the extension piece of the one-side seismic panel that extends laterally from the front surface portion of the side end of the one-side seismic panel and extends toward the side end of the other-side seismic panel, and the extension piece of the other-side seismic panel that extends laterally from the rear surface portion of the side end of the other-side seismic panel and extends toward the side end of the one-side seismic panel. Furthermore, the extension pieces of the one-side seismic panel and the other-side seismic panel that are arranged on both sides of the tension member can be arranged in front of and behind the tension member simultaneously with the installation of these seismic panels, without requiring any additional work.
Furthermore, since the front side of the tension member is covered by the extending piece of the one-side earthquake-resistant panel and the rear side of the tension member is covered by the extending piece of the other-side earthquake-resistant panel arranged on the opposite side from the one-side earthquake-resistant panel, the one-side earthquake-resistant panel, the tension member and the other-side earthquake-resistant panel can be installed sequentially from only one side within the structural surface of the column-beam frame without interference, thereby improving the installation work.
Therefore, the present invention provides a technology that can improve the aesthetic appearance of a seismic wall structure that includes a plurality of seismic panels that are arranged horizontally within the structural surface of a column-beam frame, with each upper and lower end joined to the respective upper and lower beams, and tension members that are arranged between adjacent pairs of the seismic panels and connect the respective upper and lower beams, by covering the tension members from the spaces in front and behind them without incurring any effort or cost.

A second characteristic feature of the present invention is that the earthquake-resistant panel is made of cross-laminated timber, which is made by stacking and bonding multiple lamina materials so that the fiber directions are perpendicular to each other.

With this configuration, the extension piece that conceals the tension member from the front and rear spaces is formed as a section that extends from an earthquake-resistant panel made of cross-laminated wooden boards that is positioned adjacent to the tension member. This allows for the construction of a wall with a continuous cross-laminated wooden board structure without the extension piece being exposed when viewed from the front and rear spaces on the structural surface of the column-beam frame, improving the design of the wall.

A third characteristic feature of the present invention is that the extension piece is formed such that the lamina material of the surface layer corresponding to the surface portion extends further to the side than the lamina material of the other layers.

With this configuration, when an earthquake-resistant panel is constructed from cross-laminated wooden boards, extending pieces can be easily formed on the side edges of the earthquake-resistant panel by simply extending the lamina material of the surface layer corresponding to the surface portion further to the side than the lamina material of the other layers.

The fourth characteristic configuration of the present invention is that the earthquake-resistant panel is configured to have the extending piece portion on the front surface portion at one side end, and to have the extending piece portion on the rear surface portion at the other side end.

According to this configuration, when tension members are arranged on both side ends of an earthquake-resistant panel, the front side of the tension member arranged on one side can be obscured by the extension piece formed on the front surface portion of one side end of the earthquake-resistant panel, and the rear side of the tension member arranged on the other side can be obscured by the extension piece formed on the rear surface portion of the other side end of the earthquake-resistant panel. Furthermore, with respect to the extension pieces formed on both side ends of the earthquake-resistant panel, one extension piece is formed on the front surface portion of the one side end and the other extension piece is formed on the rear surface portion opposite to the one side. Therefore, the earthquake-resistant panel and the pair of tension members arranged on both sides can be sequentially installed without interference within the structural plane of the column-beam frame in the order of installing the earthquake-resistant panel on one side before installing the tension member on one side, and then installing the tension member on the other side after installing the earthquake-resistant panel.
Furthermore, if the earthquake-resistant panel is made up of wooden cross-laminated boards and the extension piece portion is formed in a state in which the lamina material of the surface layer corresponding to the surface portion extends further to the side than the lamina material of the other layers, the same size lamina material can be used for the surface layers at the front and rear of the earthquake-resistant panel.

(a) is a front view showing the state after the first earthquake-resistant panel is installed, and (b) is a cross-sectional view taken along the line A-A. FIG. 1A is a front view showing a state after the first tension member is attached, and FIG. 1B is a cross-sectional view taken along the line A-A of the front view. (a) Front view showing the state after the second earthquake-resistant panel is installed, and (b) its A-A cross-sectional view FIG. 1A is a front view showing a state after the second tension member is attached, and FIG. 1B is a cross-sectional view taken along the line A-A of the front view. (a) Front view showing the state after the third earthquake-resistant panel is installed, and (b) its A-A cross section. FIG. 1A is a front view showing the completed state of the earthquake-resistant wall structure of this embodiment, and FIG. 1B is a cross-sectional view taken along the line A-A of the front view. Partially enlarged view of FIG.

An embodiment of the present invention will be described with reference to the drawings.
1 to 6, the front side of the paper surface within the structural plane 18 of the beam-column structure 10 is called the front side F, and the back side of the paper surface is called the rear side B. In addition, in the A-A cross-sectional views (b) and 7 shown in FIGS. 1 to 6, the upper side of the paper surface is called the front side F, and the lower side of the paper surface is called the rear side B.

As shown in Figures 6 and 7, the shear wall structure 50 of this embodiment is configured to include a plurality of seismic panels 20 arranged side by side in the horizontal direction (left-right direction in Figures 6 and 7) within the structural face 18 of a beam-column frame 10, which is composed of a pair of upper and lower beams 11 and a pair of left and right columns 16. The plurality of seismic panels 20 have their upper and lower ends joined to the respective beams 11, and tension members 30 are disposed in the gaps between adjacent seismic panels 20 to connect the upper and lower beams 11. Specifically, in this embodiment, three seismic panels 20, namely, a first seismic panel 20A, a second seismic panel 20B, and a third seismic panel 20C, are arranged side by side in this order within the structural face 18. A first tension member 30A is provided in the gap between the first seismic panel 20A and the second seismic panel 20B, and a second tension member 30B is provided in the gap between the second seismic panel 20B and the third seismic panel 20C.

In this type of shear wall structure 50, the upper and lower ends of the seismic panels 20 are joined to the upper and lower beams 11 via gusset plates 13 and 23 (described below), thereby transmitting shear forces between the upper and lower beams 11 and the seismic panels 20. Additionally, by filling the spaces between the upper and lower beams 11 and the seismic panels 20 with filler 19, such as non-shrink mortar or concrete, compressive forces are transmitted from the seismic panels 20 to the upper and lower beams 11. Restraining the seismic panels 20 by the upper and lower beams 11 in this manner creates rotational resistance in the seismic panels 20, thereby increasing the horizontal rigidity of the frame. Furthermore, because the seismic panels 20 do not have tensile joints, diagonal compressive forces connecting the corners of the seismic panels 20 form a predominant stress state. Therefore, by connecting the upper and lower beams 11 with tension members 30 placed between adjacent seismic panels 20, the overall stress state is similar to that of a truss structure, with the seismic panels 20 functioning as diagonal compression members and the vertical tension members 30, and they function as seismic elements.

1, gusset plates 23 are fixed to the upper and lower ends of the seismic panel 20 along the in-plane direction of the seismic panel 20, with their base ends embedded in approximately the center of the seismic panel 20 in the thickness direction and their tip ends protruding toward the upper and lower beams 11. The base ends of the gusset plates 23 embedded in the seismic panel 20 are fixed to the seismic panel 20 by a plurality of drift pins 24 that penetrate the seismic panel 20 in the thickness direction.
On the other hand, gusset plates 13 extending along the in-plane direction of the structural face 18 are joined to the upper and lower beams 11 by welding, for example, in a form in which they protrude toward the earthquake-resistant panels 20 .
The gusset plates 23 fixed to the earthquake-resistant panels 20 are then aligned from the front side F along the gusset plates 13 provided on the beams 11, and these are joined with the panel fixing bolts 14, thereby fixing the earthquake-resistant panels 20 within the structural face 18 of the beam-column structure 10. In this way, the gusset plates 23, 13 joined with the panel fixing bolts 14 join the earthquake-resistant panels 20 to the upper and lower beams 11 in a manner that allows shear forces to be transmitted between them.

Similarly, the upper and lower ends of the tension member 30 are joined by tension member joining bolts 35 to gusset plates 32, which are joined to the upper and lower beams 11, for example, by welding. This allows the gusset plates 32 to join the tension member 30 to the upper and lower beams 11 so that tensile force can be transmitted. In this embodiment, the tension member 30 is composed of a pair of channel steels 33, with the gusset plate 32 sandwiched between their webs; however, the tension member 30 may also be composed of other structural steel or steel bars.

The earthquake-resistant wall structure 50 of this embodiment has the feature of concealing the tension members 30 from the front side F and rear side B spaces without incurring additional time or cost, thereby improving aesthetic appeal, and details of this are explained below.

6 and 7 , the seismic panel 20 has an extending piece 22 at the side end 20a on the tension member 30 side, where the surface portion on one side extends further to the side than the other portion. In a pair of seismic panels 20 arranged on both sides of one tension member 30, the extending piece 22 of the seismic panel 20 on one side (the first seismic panel) extends toward the side end 20a of the seismic panel 20 on the other side (the second seismic panel) while covering the front side F of the tension member 30, and the extending piece 22 of the seismic panel 20 on the other side (the second seismic panel) extends toward the side end 20a of the seismic panel 20 on one side (the first seismic panel) while covering the rear side B of the tension member 30.
With this configuration, the extension piece 22 of the earthquake-resistant panel 20 on one side and the extension piece 22 of the earthquake-resistant panel 20 on the other side conceal the tension member 30 provided between adjacent earthquake-resistant panels 20 from the spaces on the front side F and rear side B. Furthermore, the extension piece portions 22 of the earthquake-resistant panels 20 arranged on both sides of the tension member 30 in this manner are arranged on the front side F and rear side B of the tension member 30 simultaneously with the installation of these earthquake-resistant panels 20 without requiring any additional work. In this embodiment, a slight gap is provided between the extension piece 22 extending from the side end portion 20a of the earthquake-resistant panel 20 on one side and the side end portion 20a of the earthquake-resistant panel 20 on the other side toward which the extension piece 22 extends, but the width and presence of such a gap can be changed as appropriate.

For example, in the first seismic panel 20A on the left side and the second seismic panel 20B on the right side, which are arranged on either side of the first tension member 30A, the extension piece 22 extending to the right from the right side end 20a of the first seismic panel 20A extends toward the left side end 20a of the second seismic panel 20B, covering the rear side B of the first tension member 30A, and the extension piece 22 extending to the left from the left side end 20a of the second seismic panel 20B extends toward the right side end 20a of the first seismic panel 20A, covering the front side F of the first tension member 30A. The right extension piece 22 of the first seismic panel 20A and the left extension piece 22 of the second seismic panel 20B thus obscure the first tension member 30A from the spaces on the front side F and rear side B.

Meanwhile, in the second seismic panel 20B on the left side and the third seismic panel 20C on the right side, which are arranged on either side of the second tension member 30B, the extension piece 22 extending rightward from the right side end 20a of the second seismic panel 20B extends toward the left side end 20a of the third seismic panel 20C, covering the rear side B of the second tension member 30B, and the extension piece 22 extending leftward from the left side end 20a of the third seismic panel 20C extends toward the side end 20a of the second seismic panel 20B, covering the front side F of the second tension member 30B. The right extension piece 22 of the second seismic panel 20B and the left extension piece 22 of the third seismic panel 20C thus obscure the second tension member 30B from the spaces on the front side F and rear side B.

That is, for the first seismic panel 20A arranged adjacent to the left side of the first tension member 30A, an extension piece 22 is formed on the surface portion of the rear side B of the right side end 20a to conceal the rear side B of the first tension member 30A, and the left side end 20a is formed as a flat surface. Similarly, for the third seismic panel 20C arranged adjacent to the right side of the second tension member 30B, an extension piece 22 is formed on the surface portion of the front side F of the left side end 20a to conceal the front side F of the second tension member 30B, and the right side end 20a is formed as a flat surface.

On the other hand, for the second earthquake-resistant panel 20B, in which the first tension member 30A and the second tension member 30B are arranged adjacent to each other on both the left and right sides, an extension piece 22 is formed on the surface portion of the front side F of the left side end portion 20a to cover the front side F of the first tension member 30A, and an extension piece 22 is formed on the surface portion of the rear side B of the right side end portion 20a to cover the rear side B of the second tension member 30B.

As shown in Figure 7, the earthquake-resistant panel 20 is made of a cross-laminated timber structure, which is made by laminating and gluing multiple lamina members 27 together so that their fiber directions are perpendicular to each other. The Japanese Agricultural Standards define cross-laminated timber as "a general material made of three or more layers of sawn boards or small square timbers (including those prepared by joining and gluing them lengthwise with their fiber directions approximately parallel to each other) arranged or glued widthwise with their fiber directions approximately parallel to each other, and then laminated and glued together, primarily with their fiber directions approximately perpendicular to each other." Here, the lamina members 27 refer to the sawn boards that make up the cross-laminated timber structure.
In this embodiment, the "number of plies," which is the number of lamina materials 27 stacked in the thickness direction, is 7, and the "number of layers," which is the number of layers in the thickness direction with different fiber directions, is 5. In other words, the cross-laminated timber that makes up the seismic panel 20 of this embodiment is 5 layers and 7 plies. Note that the number of lamina and layers of the cross-laminated timber that makes up the seismic panel 20 can be changed as appropriate.

In the seismic panel 20 constructed from cross-laminated timber in this manner, the extension pieces 22 that conceal the tension members 30 from the spaces on the front side F and rear side B are formed as parts that extend from the seismic panel 20 positioned adjacent to the tension members 30. As a result, a wall made of continuous wooden cross-laminated timber is constructed without the extension pieces 22 being exposed when viewed from the spaces on the front side F and rear side B on the structural surface 18 of the column-beam structure 10, improving the design of the wall.

Furthermore, in the seismic panel 20 constructed from cross-laminated timber, the extension piece 22 is formed by extending the lamina material 27A of the surface layer corresponding to the surface portion of the front side F or rear side B further to the side than the lamina material 27 of the other layers. With this configuration, the extension piece 22 can be easily formed on the seismic panel 20 constructed from cross-laminated timber, for example, by simply changing the size of the lamina material 27A of the surface layer from the lamina material 27 of the other layers. Note that in this embodiment, the extension piece 22 is formed from one ply of lamina material 27A, but the number of plies forming the extension piece 22 can be changed as appropriate.

In the earthquake-resistant wall structure 50 of this embodiment, each earthquake-resistant panel 20 and each tension member 30 arranged between adjacent panels can be installed sequentially without interference from only one front side F within the structural face 18 of the column-beam frame 10.
The following provides a detailed explanation of the installation work of the earthquake-resistant panels 20 and tension members 30 within the structural face 18 of the beam-column frame 10.

First, as shown in Figure 1, after the slab 40 is formed on the lower beam 11, the first earthquake-resistant panel 20A is attached to the left part of the structural face 18 from the front side F and joined to each of the upper and lower beams 11.
2, the first tension member 30A is attached adjacent to the right side of the first seismic panel 20A within the structural face 18 and joined to each of the upper and lower beams 11. At this time, the attachment position of the first tension member 30A is on the near side (front side F) of the extension piece 22 formed on the rear side B of the right side end portion 20a of the already attached first seismic panel 20A, so the first tension member 30A can be smoothly attached from the front side F without interfering with the extension piece 22 of the first seismic panel 20A.

Next, as shown in Figure 3, the second seismic panel 20B is attached to the center of the structural face 18 from the front side F, adjacent to the right side of the first tension member 30A within the structural face 18, and joined to both the upper and lower beams 11. At this time, the attachment position of the extension piece 22 formed on the front side F of the left side end 20a of the second seismic panel 20B is in front of the already attached first tension member 30A (front side F). Therefore, the second seismic panel 20B with the extension piece 22 formed thereon can be smoothly attached from the front side F without interfering with the first tension member 30A.

Next, as shown in Figure 4, the second tension member 30B is attached adjacent to the right side of the second seismic panel 20B within the structural face 18 and joined to the upper and lower beams 11. At this time, the attachment position of the second tension member 30B is on the near side (front side F) of the extension piece 22 formed on the rear side B of the right side end portion 20a of the already attached second seismic panel 20B, so the second tension member 30B can be attached smoothly from the front side F without interfering with the extension piece 22 of the second seismic panel 20B.

Next, as shown in Figure 5, the third seismic panel 20C is attached to the right portion of the structural face 18 from the front side F, adjacent to the right side of the second tension member 30B within the structural face 18, and joined to both the upper and lower beams 11. At this time, the attachment position of the extension piece 22 formed on the front side F of the left side end 20a of the third seismic panel 20C is in front of the already attached second tension member 30B (front side F). Therefore, the third seismic panel 20C with the extension piece 22 formed thereon can be smoothly attached from the front side F without interfering with the second tension member 30B.

After all of the seismic panels 20A, 20B, 20B and all of the tension members 30A, 30B have been installed within the structural face 18 as described above, filler material 19 such as non-shrink mortar or concrete is filled into the gaps between the upper and lower beams 11 and the seismic panels 20A, 20B, 20C, as shown in Figure 6, and the seismic wall structure 50 is completed as the filler material 19 hardens.

[Another embodiment]
Other embodiments of the present invention will be described below. Note that the configurations of the embodiments described below are not limited to being applied independently, but can also be applied in combination with the configurations of other embodiments.

(1) In the above embodiment, the earthquake-resistant panel 20 was constructed from wooden cross-laminated timber boards, but the present invention also allows for the use of earthquake-resistant panels constructed from other materials. Furthermore, when constructing the earthquake-resistant panel 20 from wooden cross-laminated timber boards, the extension piece 22 was formed by having the lamina material 27A of the surface layer corresponding to the surface portion extend further to the side than the lamina material 27 of the other layers. However, the extension piece 22 may be formed using a different method, such as by cutting the side end portion 20a of the earthquake-resistant panel 20 into a stepped shape to form the extension piece 22.

(2) In the above embodiment, the second earthquake-resistant panel 20B, which has extending pieces 22 formed on both the left and right side end portions 20a, has an extending piece 22 on the surface portion of the front side F at the left side end portion 20a, and an extending piece 22 on the surface portion of the rear side B at the right side end portion 20a. However, whether the extending piece 22 is formed on the front side F or the rear side B can be changed as appropriate, taking into consideration, for example, the efficiency of the installation work, etc.

10 Column-beam frame 11 Beam 16 Column 18 Structural face 20 Earthquake-resistant panel 20A First earthquake-resistant panel (earthquake-resistant panel)
20B Second earthquake-resistant panel (earthquake-resistant panel)
20C 3rd earthquake-resistant panel (earthquake-resistant panel)
20a: Side end portion 22: Extension piece portion 27: Lamina material 27A: Surface layer lamina material 30: Tensile member 30A: First tension member (tensile member)
30B Second tension member (tension member)
50 Shear wall structure F Front side B Rear side

Claims (4)

a plurality of earthquake-resistant panels arranged side by side along the horizontal direction within the structural plane of the column-beam frame, with upper and lower ends joined to the upper and lower beams, respectively;
tension members arranged between adjacent ones of the plurality of earthquake-resistant panels and connecting the upper and lower beams to each other;
A shear wall structure comprising:
The seismic panel has a side end portion on the tension member side, and an extension piece portion is formed integrally with the surface layer, the extension piece portion being formed by extending a surface portion corresponding to the surface layer on one side of the seismic panel laterally beyond the other portion that is not the surface portion ,
In a pair of seismic panels, one side seismic panel and the other side seismic panel, which are arranged on both sides of one of the tension members,
The extension piece formed on the one-side earthquake-resistant panel covers the front side, which is the front side of the tension member in a front view along the thickness direction of the earthquake-resistant panel, and extends toward the side end of the other-side earthquake-resistant panel in a state separated from the side end of the other-side earthquake-resistant panel,
An earthquake-resistant wall structure in which an extension piece portion formed on the other side earthquake-resistant panel covers the rear side , which is the back side of the tension member when viewed from the front , and extends toward the side end of the one side earthquake-resistant panel while being separated from the side end of the one side earthquake-resistant panel. The earthquake-resistant wall structure described in claim 1, wherein the earthquake-resistant panel is composed of cross-laminated timber panels formed by laminating and bonding multiple lamina materials so that their fiber directions are perpendicular to each other. The shear wall structure described in claim 2, wherein the extending piece portion is formed such that the lamina material of the surface layer corresponding to the surface portion extends further to the side than the lamina material of the other layers. The earthquake-resistant wall structure according to any one of claims 1 to 3, wherein the earthquake-resistant panel has the extending piece portion on the surface portion of the front side at one side end and the extending piece portion on the surface portion of the rear side at the other side end.