JP2007315127A - Woody rigid-frame structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a woody rigid-frame structure for exhibiting high earthquake resistance with an inexpensive and simple constitution. <P>SOLUTION: This woody rigid-frame structure STR is formed by joining right-left column members 2A and 2B and a beam member 3 by a joining metal fitting 20. Right-left end parts of the beam member 3 are joined by using the same two joining metal fittings 20A to 20D arranged in the vertical direction. The right-left column members 2A and 2B are respectively fixed to a foundation 1 by the same two column bases 10A to 10D arranged in the lateral direction. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a wooden frame structure, and more particularly to a wooden frame structure having improved earthquake resistance by using two column bases and metal fittings having the same shape at the joint of the frame structure.

  In Japan, where the frequency of earthquakes is high, recently there has been a tendency to require sufficient seismic resistance especially for wooden buildings, but in general, in building design, (1) vertical force due to its own weight, (2) Horizontal forces due to earthquakes and typhoons are a problem.

  Here, (1) The vertical force due to its own weight is transmitted to the beam → joint hardware → column → foundation → ground. On the other hand, for (2) horizontal force, for example, a striation was provided and the horizontal force was transmitted to the ground by this streak, or a ramen method was adopted to receive energy by deformation of the building.

In this ramen method, bending force and shearing force become problems, but conventionally there is only an idea that a dedicated member that resists bending and a dedicated member that resists shearing force are necessary. There was only a premise analysis method (for example, Non-Patent Document 1).
Allowable stress level design of wooden frame construction method house (plan editing: Japan Housing and Wood Technology Center) (Supervision: Ministry of Land, Infrastructure, Transport and Tourism Housing Bureau Building Guidance Division, Ministry of Land, Infrastructure, Transport and Tourism Housing Bureau Wooden Housing Promotion Office), Chapter 1 Wooden frame construction method House stress calculation method and reference

  However, as long as such a conventional idea is assumed, there is a problem that individual costs for manufacturing each dedicated member increase. In addition, separate work is required for processing wood for building, installation work at the construction site, etc., so the overall construction cost increases, and an inexpensive building with excellent earthquake resistance is provided. There is a problem that can not be.

  In addition, although the earthquake resistance can be improved by the bearing wall, in this case, the space cannot be utilized for other applications, and in short, the degree of freedom in design is hindered.

  In this way, in particular, in the case of a ramen construction method for a wooden building, a wooden ramen frame having an appropriate structure that realizes a desired earthquake resistance without complicating the work procedure and increasing the construction cost is desired. It is where

  This invention is made | formed in view of said subject, Comprising: It aims at providing the wooden frame frame which exhibits excellent earthquake resistance, though it is an inexpensive and simple structure.

  In order to achieve the above object, the present inventor has made various studies. As a result, only two column bases that are fixed to the foundation or two metal fittings that join the column member and the beam member are arranged at the same joint location. The inventors have discovered that they can exhibit excellent earthquake resistance, and have completed the present invention.

  That is, the invention according to claim 1 is a wooden frame structure in which left and right column members and beam members are joined by joint fittings, and the left and right ends of the beam members are arranged in two in the vertical direction. They are joined using the same joint fitting. The invention according to claim 2 is a wooden frame structure in which left and right column members and beam members are joined by a joint fitting, and the left and right column members are two identical ones arranged in the left-right direction. Each column base is fixed to the foundation. Each of the above inventions requires two identical fittings arranged in the vertical direction and two identical column bases arranged in the left-right direction, but excludes the use of other fittings and column legs. However, it is not prohibited to use an additional member supplementarily, for example, to use three or more identical joint fittings or column bases.

  In general, a frame means a frame that loads a load by combining structural members that are the frame of a building. However, the wooden frame structure according to the present invention is a column member made of wood and a beam member, and a joining metal fitting. This means a configuration that is used and integrated.

  The effect | action of this invention is considered as follows. First, in the invention according to claim 1, since the joining bracket is separated into two in the upper and lower directions, as shown in FIG. 17A, when horizontal force is applied from the left to the right, While the upper member UP is opposed, the lower member DN is opposed to the shearing force. Conversely, as shown in FIG. 17B, when the horizontal force is applied from the right to the left, the lower member DN opposes the bending, while the upper member UP counters the shearing force. Oppose. In the event of an earthquake, the states of FIG. 17 (a) and FIG. 17 (b) are alternately repeated. However, the desired earthquake resistance can be realized based on the above-described action by simply arranging the same members vertically. This point has been experimentally verified.

  In the invention according to claim 2, since the column base is separated into the left and right, when the horizontal force is applied from the left to the right as shown in FIG. On the other hand, the right side member R counters the shearing force. Conversely, as shown in FIG. 17D, when the horizontal force is applied from the right to the left, the right member R counters the bending, while the left member L counters the shearing force. To do. In the event of an earthquake, the states of FIG. 17C and FIG. 17D are alternately repeated, but the desired earthquake resistance can be realized based on the above-described action by simply arranging the same members on the left and right. This point has also been experimentally verified.

  According to the above-described present invention, it is possible to realize a wooden ramen frame that exhibits excellent earthquake resistance while being inexpensive and simple.

  Hereinafter, the present invention will be described in more detail based on examples.

  FIG. 1 is a diagram illustrating the principle of a wooden frame frame STR according to an embodiment. As shown in the drawing, this frame structure STR includes four column bases 10 (10A to 10D) fixed to the concrete foundation 1, and left and right columns 2 (2A, 2B) connected to the column base 10 and standing. And the beam 3 spanned between the left and right columns 2 </ b> A and 2 </ b> B, and four joint fittings 20 (20 </ b> A to 20 </ b> A) that join the column 2 and the beam 3.

  The column bases 10a to 10d are fastened and fixed to the anchor bolts BT protruding from the concrete foundation 1 by using nuts NT (FIG. 2). In addition, each of the fittings 20a to 20d is coupled to the beam 3 with a coupling pin PIN passing through the distal end portion with the base end portion being fixed to the pillars 2A and 2B (FIG. 1B). . A bolt BT is inserted into the base end portion of the joint fitting 20 and penetrates the column 2, and a nut NT is fastened to the tip of the penetrated bolt BT via a disk-shaped washer (FIG. 1 ( a)).

  In addition, when actually building a building, it is usual that the base 4 is arranged on the foundation 1 and another beam 3 is arranged outside the left and right columns 2A and 2B. And when fixing another beam 3 to the outer side of the pillar 2, two each of the joint metal fittings 20 of the same shape are arrange | positioned on both sides of the pillar 2, and the whole is integrated with a volt | bolt and a nut.

  According to the wood frame frame STR of the present embodiment configured as described above, when a load is received in the horizontal direction due to an earthquake, the joint fittings 20A and 20D are against the stress in the left direction indicated by the arrow. The bending moment due to the horizontal load is borne, and the joining brackets 20B and 20C bear the shearing force of the beam 3. On the other hand, for the stress in the right direction, the opposite is true: the joint fittings 20C and 20B bear the bending moment due to the horizontal load, and the joint fittings 20D and 20A bear the shearing force of the beam 3 and have excellent earthquake resistance. Demonstrate performance.

  The same applies to the column base 10, and the pair of column bases 10A, 10B and 10C, 10D of each joint function complementarily with respect to the left and right vibrations and exhibit excellent seismic performance. It has been experimentally confirmed that the pair of column bases 10 or the pair of fittings 20 exhibits excellent earthquake resistance.

  The same applies to the vibrations in the vertical direction, and each pair of joint fittings 20A, 20B and 20C, 20D and each pair of column bases 10A, 10B, 10C, 10D function in a complementary manner, thereby providing seismic performance. Demonstrate. However, in the Building Standard Law and others, vertical vibrations are not particularly problematic.

  FIG. 2 is a perspective view showing a mounting state of the column base 10, and FIG. 3 shows the configuration of the single column base 10. This column base 10 is a cast steel product, and as shown in FIG. 3, a substantially box-shaped main body portion 10A fixed to the concrete foundation 1 and a joint portion 10B standing upright from the main body portion 10A are integrally formed. Yes.

  The main body 10A includes a top portion 12 provided with four working holes WR, a bottom portion 13 provided with a mounting hole HO through which an anchor bolt BT protruding from the foundation 1 is passed, and a pair of sides orthogonal to the top portion 12 and the bottom portion 13 The portions 14 and 15 are orthogonal to the four portions 12 to 15, and are provided with a central wall 16 that bisects the internal space of the main body portion 10 </ b> A in the front-rear direction.

  In the center of the top portion 12, a plate-like joint portion 10B is erected so as to bisect the four work holes WR. Each work hole WR is a round hole penetrating the top portion 12 and is preferably as large as possible within a range that does not impair the strength of the column base 10, but in this embodiment, four round holes are uniformly arranged. Is formed.

  The bottom portion 13 has four mounting holes HO concentric with the work holes WR corresponding to the four work holes WR. The mounting hole HO is a through hole for allowing the anchor bolt BT protruding from the concrete foundation 1 to pass therethrough. Then, the column base 10 is securely fixed to the foundation by tightening the nut NT into the anchor bolt BT that has passed through the mounting hole HO (FIG. 2).

  Thus, since the outer peripheral surface 13a (FIG. 5) of the bottom portion 13 is fixed in contact with the concrete foundation 1, it is formed flat and parallel to the top portion 12. Since the column base 10 is a cast product, it is extremely easy to realize a flat outer peripheral surface that is exactly parallel to the top portion 12.

  The left and right side portions 14 and 15 are configured to be orthogonal to the top portion 12 and the bottom portion 13. The vertical heights of the side portions 14 and 15 are determined in accordance with the heads of the anchor bolts BT protruding from the concrete foundation, and are set to a minimum necessary height for accommodating the heads of the anchor bolts BT. Has been. Moreover, since the bases 4 and 4 are normally arrange | positioned on the right and left of the column base 10, the outer peripheral surface of the left-right side parts 14 and 15 is formed flat.

  By the way, the central wall 16 is provided in connection with each inner surface of the right side part 14, the left side part 15, the top part 12, and the bottom part 13, and the central wall 16 is orthogonal to each inner surface. Since the central wall 16 is provided at a position continuous with the joint portion 10B provided upright on the top portion 12, a load in the vertical direction can be reliably received. In addition, insects and small animals can be reliably prevented from entering.

  Further, triangular plate-shaped reinforcing ribs 17 are provided so as to be connected to the inner surfaces of the central wall 16 and the top portion 12 (FIG. 6). Therefore, the main body portion 10A divided into two by the central wall 16 is further divided into two by the reinforcing ribs 17, each having one working hole WR and one mounting hole HO.

  On the other hand, the joint portion 10B has four passage holes 18 formed in the upper portion thereof (FIG. 5). The passage hole 18 is formed with an outer passage hole 18A and an inner passage hole 18B at symmetrical positions with respect to the virtual center line in the vertical direction of the joint portion 10B. The through hole 18 is a through hole through which the connecting pin PIN is passed when the column base 10 and the column are joined. In addition, although the opening hole 19 larger than the passage hole 18 is formed in the lower part of a junction part, this is provided for weight reduction.

  Then, the usage method of the column base 10 of an Example is demonstrated confirmingly. As shown in FIG. 2, a work groove 50 a that receives the joint portion 10 </ b> B and a pin hole 50 b corresponding to the passage hole 18 of the joint portion 10 </ b> B are formed in advance on the pillar 2 to be joined. The pin holes 50b of the pillar 2 are not necessarily provided as shown in the illustrated example, and may be two in some cases.

  On the other hand, four anchor bolts BT protrude from the concrete foundation 1 corresponding to the position of the mounting hole HO of the main body 10A. Therefore, first, the anchor bolt BT is passed through the mounting hole HO, and the column base 10 is disposed on the concrete foundation 1. Thereafter, the nut NT is fastened to the head of the anchor bolt BT by using the rectangular openings provided at the front and rear of the main body 10A and the work hole WR provided at the top 12, and the foundation 1 The column base 10 is firmly fixed to the top.

  When the fixing work of the column base 10 is finished in this way, the column 2 is lowered on the column base 10 and the column 2 is arranged on the column base 10. In this case, the column 2 is lowered so that the joint portion 10B enters the work groove 50a. Then, the pillar 2 is fixed to the pillar base 10 by driving the connecting pin PIN into the pin hole 50b.

  FIG. 7 illustrates the joint fitting 20 that fixes the beam 3 to the left and right columns 2A and 2B. This joining metal fitting 20 is also a cast steel product, and is provided with a substantially rectangular plate-like main body portion 21 and a pair of substantially cylindrical portions 22 that are connected to one end side of the plate-like main body portion and project in opposite directions with respect to the main body portion. , 23 are integrally formed.

  An inlet groove 24 having a vertically symmetrical shape is formed on the distal end side of the plate-like main body portion 21. The introduction groove 24 is a groove for allowing the connecting pin PIN (FIG. 7A) inserted into the beam 3 to slide in the state. Further, three pin insertion holes 25 are formed in the vicinity of the introduction groove 24, and an opening 26 for reducing the weight is formed in the center of the plate-like main body 21.

  The pair of cylindrical portions 22 and 23 have substantially square mounting portions 22b and 23b and flange portions 22a and 23a that form arcuate outer peripheral edges above and below the mounting portions 22b and 23b, respectively. Since the joint fitting 20 has the thick flange portions 22a and 23a, the mounting strength is improved as compared with the case of a simple plate material.

  Each of the pair of cylindrical portions 22 and 23 is provided with a mounting hole HO, and the bolt BT is inserted through the column through the mounting hole HO. The cylindrical portion 23 is provided at a position where the uppermost surface of the flange portion 23 a coincides with the uppermost surface of the plate-like main body portion 21. On the other hand, the cylindrical portion 23 is provided at a position where the mounting hole HO substantially coincides with the vertical center of the plate-like main body portion 21. Therefore, if this joining bracket is turned upside down, the same joining bracket can be attached to the adjacent side surfaces of the same wood.

  When using this joining metal fitting 20, the pillar 2 is previously formed with a through hole penetrating the pillar 2 in the horizontal direction left and right, and large-diameter cylindrical holes provided at both ends in the length direction of the through hole. . In addition, a work groove 60 a for receiving the plate-like main body portion 21 and a pin hole (not shown) corresponding to the pin insertion hole 25 are formed in the beam 3 in advance. Further, a pin hole is formed at a position corresponding to (the bottom part of) the upper introduction groove 24 of the joint fittings 20A and 20C arranged on the upper side, and a connecting pin PIN is inserted into the pin hole.

And the cylindrical parts 22 and 23 of the joining metal fitting 20 are arrange | positioned in the cylindrical hole of the pillar 2, the bolt BT is passed through the mounting hole HO of the cylindrical parts 22 and 23, and the through hole of the pillar 2, and the tip of the bolt BT is a nut NT. Tighten with. In this state, the beam 3 is lowered and the working groove 60a is slid into the plate-like main body 21. Thereafter, when a connecting pin is driven into the pin insertion hole 25, the joining between the column and the beam is completed.
<Test example (see FIGS. 9 to 16)>
The contents of the shear test of the wooden frame frame STR shown in FIG. 1 are as described in FIGS. The test body is as shown in FIG. 9 and is exactly the same as the configuration of FIG.

  The test method is No. 1 in Chapter 2 “Testing and Evaluation Methods for Each Element of Wooden Shaft Construction Method Housing” in Japan Housing and Wood Technology Center (Planning Editing) “Allowable Stress Design of Wooden Shaft Construction Method Housing” Test method of wooden frame bearing wall based on Article 46, Paragraph 4, Table 1 (8), Evaluation method / 1.2 In-plane shear test method (1) Column base fixed type (no load type) 2) Force According to method (1) (see FIG. 10).

  The test results are as shown in FIG. 11, and the effectiveness of the present invention is confirmed by the yield strength, ultimate strength, maximum load, and specific deformation strength (1/120 rad, 1/150 rad).

According to the test as in Test Example 1, the spring constant of the column base 10 was calculated to be 1.36 × 10 ³ KN · m / rad. In addition, the spring constant of the joint fitting 20 was calculated to be 0.68 × 10 ³ KN · m / rad. When the analysis software is operated based on the numerical value, the horizontal proof stress is calculated (FIG. 16).

  Examination based on this numerical value and the test results of the test example 1 (see FIG. 11) shows that even if the worst value is evaluated, the horizontal proof stress is 8.74 KN at an interlayer displacement angle of 1/120. At the angle 1/150, it becomes 7.00 KN.

  Further, when the wall magnification is examined in the case where the interlayer displacement angle is 1/120 or 1/150, the wall magnification is calculated to be 1.02 to 1.72 in the spans of 2700 mm and 3600 mm (see FIG. 16), which is And the bearing wall can be omitted.

  Although the embodiments have been specifically described above, the specific contents do not particularly limit the present invention. For example, the principle diagram of FIG. 1 shows the structure actually used for the evaluation test of the allowable shear strength as it is, and the size and shape of the wide columns and beams used there are limited. It is not a thing and it can change suitably. Similarly, it is needless to say that the material, shape, and size of the joint fitting and the column base can be appropriately changed.

It is drawing explaining the wooden frame frame concerning an Example. It is drawing which shows the attachment state of a column base. It is a perspective view explaining the structure of a column base. It is a plan view and a bottom view of the column base, It is a front view and a side view of the column base, They are AA sectional drawing and BB sectional drawing of a column base, It is drawing which shows the attachment state of a joining metal fitting. It is drawing which shows the structure of a joining metal fitting. It is drawing which shows the structure of a test example. It is drawing which shows the test method of a test example. It is drawing which shows the test result of a test example. It is drawing which shows the test result of a test example. It is drawing which shows the test result of a test example. It is drawing which shows the final destruction condition of a test example. It is drawing which shows the final destruction condition of a test example. It is drawing which shows the examination content of a test example. It is drawing explaining the effect | action of this invention.

Explanation of symbols

STR wooden ramen frame 2A, 2B Column member 3 Beam 20 Joint bracket 20A-20D Joint bracket 10A-10D Column base

That is, the invention according to claim 1 is a wooden frame structure in which left and right column members and beam members are joined by a joint fitting, and the left and right ends of the beam members are arranged in a vertical direction and the column members. and two identical metal joint which is fixed to and driven into the beam member, using a connecting pin passing through the pin insertion hole provided in the joint fitting, seismic in Rukoto joined to the pillar member Improves sex . The invention according to claim 2 is a wooden frame structure in which left and right column members and beam members are joined by a joint fitting, and the left and right column members are arranged in a left-right direction and fixed to a foundation. two of the same column base was, are driven into the pillar member, using a connecting pin passing through the passage hole provided in the column base, it is fixed to the base, respectively to improve the earthquake resistance in Rukoto Yes. Each of the above inventions requires two identical fittings arranged in the vertical direction and two identical column bases arranged in the left-right direction, but excludes the use of other fittings and column legs. However, it is not prohibited to use an additional member supplementarily, for example, to use three or more identical joint fittings or column bases.

In other words, the invention according to claim 1 is not limited to other dedicated members that resist bending and other dedicated members that resist shearing force, and the two continuous in the vertical direction are fixed to the left and right column members, respectively. A wooden frame structure in which the left and right column members and the left and right ends of the beam member are joined to each other with the same joining bracket to improve the earthquake resistance , the joining bracket is a first part formed in a plate shape And a second part projecting perpendicularly to the first part on the first part base end side, an introduction groove is formed on the tip part side of the first part, and a joining metal fitting is formed on the second part. A mounting hole for fixing to the column member is provided, and after the connecting pin driven into the beam member is slid into the introduction groove of the joint fitting fixed to the column member, another connecting pin is driven into the beam member. By passing through the pin insertion hole provided in the first part, column member and beam member It was to be joined to.
Further, the invention according to claim 2 includes a first part formed in a plate shape and a mounting hole without using another dedicated member that resists bending or another dedicated member that resists shearing force . by joining fittings and two parts are continuously provided, while joining the right and left end portions of the left and right of the column member and the beam member, the two identical column bases in the lateral direction are continuously fixed to the foundation, the left and right A wooden frame structure in which each column member is fixed to a foundation to improve earthquake resistance, and the column base includes a substantially box-shaped main body portion fixed to the foundation, and a joint portion standing upright from the top of the main body portion. Is an integrally formed cast steel product, and the main body portion includes a top portion, a bottom portion, a pair of side portions orthogonal to the top portion and the bottom portion, and an inner space of the main body portion orthogonal to these four portions. With a central wall that shields the front and rear, and driving the connecting pin into the pillar member In, by passing through the passage hole provided at the junction of the column base, and so as to join the said post member and said base.

According to the wooden frame structure STR of the present embodiment configured as described above, when receiving a load in the horizontal direction due to an earthquake, the joining brackets 20A, 20B and 20C, 20D function in a complementary manner, Exhibits excellent seismic performance by bearing the bending moment and shear force due to horizontal load .

That is, the invention according to claim 1 is the same two joint fittings in which a substantially rectangular plate-like main body part and a substantially cylindrical part provided with a mounting hole for fixing itself to a column member are connected. The left and right column members and the left and right ends of the beam member are joined together, and the left and right column members are fixed to the foundation only by two identical column legs fixed to the foundation continuously in the left-right direction. This is a wooden frame structure with improved earthquake resistance, and the column base is a cast steel in which a substantially box-shaped main body portion fixed to the foundation and a joint portion standing upright from the top of the main body portion are integrally formed. The main body is a top wall, a bottom wall, a pair of left and right sides perpendicular to the top and the bottom, and a central wall that is perpendicular to these four parts and shields the internal space of the main body from front to back includes the door, is constituted by opening the front and rear, write out to the beam member After the inserted connecting pin is slid into the introduction groove of the joint fitting fixed to the column member, another connecting pin is driven into the beam member, and a pin insertion hole provided in the plate-like main body portion is inserted. by passing the medium, while bonding the beam member and the pillar member, by implanting coupling pin to said post member, by passing through the passage hole provided at the junction of the column base, The foundation and the column member are joined.

That is, the invention according to claim 1 is provided with a substantially rectangular plate-like main body portion having a vertically symmetrical introduction groove formed on the tip side, and an attachment hole for fixing itself to the column member, and is opposite to each other. together and a pair of generally cylindrical portion protruding direction is configured by consecutively provided by only two identical metal joint arranged in the vertical direction, to join the right and left end portions of the left and right of the column member and the beam member, It is a wooden frame structure that improves seismic resistance by fixing each of the left and right column members to the foundation only by two identical column bases that are continuously fixed to the foundation in the left-right direction. Is a cast steel product integrally formed with a substantially box-shaped main body fixed to the top and a joint standing upright from the top of the main body, and the main body is orthogonal to the top, bottom, top and bottom A pair of left and right side parts, and perpendicular to these four parts, the main body And a central wall of the inner space shield around the, is constructed by opening the front and rear, the central wall is connected to a triangular plate-like reinforcing rib provided in the front-rear direction, driven into the beam member the the connecting pin, after it slipped said introduction groove of fixed said connecting bracket to said post member, by implanting another connection pin to said beam member, the pin insertion hole provided in the plate-shaped body portion By passing through, the column member and the beam member are joined, while a connecting pin is driven into the column member and passed through a through hole provided in the joint of the column base. The foundation and the column member are joined together.

Claims (5)

A wooden frame structure in which left and right column members and beam members are joined by joint fittings, and the left and right ends of the beam members are joined by using two identical joint fittings arranged in the vertical direction. A wooden ramen frame characterized by A wooden frame structure in which left and right column members and beam members are joined by a joint fitting, and the left and right column members are fixed to a foundation by two identical column bases arranged in the left and right direction, respectively. A wooden ramen frame characterized by It is a wooden frame structure made by joining left and right column members and beam members with joint fittings,
The left and right end portions of the beam member are joined using two identical fittings arranged in the vertical direction, and the left and right column members are joined by two identical column legs arranged in the horizontal direction, A wooden ramen frame characterized by being fixed to each foundation. A column base used in the wooden ramen frame of any one of claims 1 to 3. The joining metal fitting used with the wooden ramen frame in any one of Claims 1-3.