JP2014037705A - Structure for fixing load bearing wall of thin-plate lightweight shape steel construction - Google Patents

Abstract

PROBLEM TO BE SOLVED: To further uniformize mutual axial forces when a vertical frame material is erected on a concrete foundation via two anchor bolts.SOLUTION: A rising part of a hold-down fastener 54 is fixed to a central face plate 61 of thin-plate lightweight shape steel of only either of load bearing walls 5 in which a column body is configured by assembling two pieces of thin-plate lightweight shape steel together. Two or more anchor bolts 144 rising from a foundation are inserted through a lower frame material of the load bearing wall 5 and a horizontal part 16 of the hold-down fastener, and a nut 76 is subsequently screwed and fixed to a protruding screw part thereof.

Description

  The present invention relates to a steel house (a steel house is usually a steel-based panel constructed by combining a frame material made of a thin lightweight steel with a plate thickness of 0.4 mm or more and less than 2.3 mm, and a structural surface material to the frame material. Of thin-walled lightweight steel structures used in building structures such as houses) or non-residential building structures that use thin-walled lightweight steel-bearing walls. It relates to a fixed structure.

  Conventionally, as shown in FIGS. 15 and 16, a vertical frame member 208 in a load-bearing wall (panel) 210 is drilled into a vertical portion 223 in a hole-down hardware 220 as a joining structure of a thin-walled lightweight steel structure bearing wall and foundation. In the state where the hole down hardware 220 is floated from the lower frame material 209, the upper part of the anchor bolt 221 is inserted into the lower horizontal portion 225 and the lower frame material 209 of the hole down hardware 220, and the washer and the spring washer are attached. A joint structure is also known in which the nut 216 is tightened and fixed to the concrete foundation 202 via the anchor bolt 221 (see, for example, Patent Document 1).

  By the way, the number of anchor bolts 221 is usually composed of one, but the number of anchor bolts 221 is increased from the viewpoint of increasing the proof stress, especially when this thin and light steel structure (steel house) is four stories or more. There is a need to configure the two. When two anchor bolts are arranged, two vertical frame members 208b are provided on both sides of the central vertical frame member 208a. Then, by attaching the hole down hardware 220 to each vertical frame member 208b, the center vertical frame member 208a is disposed on both sides, and the anchor bolts located on both sides with the vertical frame member 208a as the center as described above. The lower end of 221 is embedded in the concrete foundation 202.

  Thereby, when a horizontal force or wind load (design external force) at the time of an earthquake as shown in FIG. 17 acts on the building, it is possible to have a structure that transmits the axial force of the vertical frame member 208 to the concrete foundation 202. . At this time, a bending moment is applied to the vertical frame member 208. However, since the vertical vertical frame member 208a is fixed with the anchor bolts 221 from both sides with the center vertical frame member 208a as the center, rotation constraint due to the bending moment is applied. It becomes. As a result, as shown in FIG. 17, non-uniform axial forces are applied to the anchor bolts 221-1 and 221-2 provided on both sides with the center vertical frame member 208a as the center.

  In particular, when a horizontal force or wind load during an earthquake is applied to a thin steel lightweight steel structure (steel house) that is 4 stories or more in height, the bending moment applied to the vertical frame member 208 becomes larger. There is a problem that the non-uniformity of the axial force between 221-1 and 221-2 becomes larger. In the first place, the purpose of arranging the two anchor bolts 221 is to cause each anchor bolt 221 to bear a large axial force acting in the vertical direction. When a horizontal force due to such an earthquake is applied, the anchor bolt Since the tensile force is applied to 221-1 and the compressive force is applied to the anchor bolt 221-2, the load is borne by only one anchor bolt 221 after all. That is, in the above-described embodiment, a non-uniform load is applied to the two anchor bolts 221, and thus there has been a problem that the effect of providing two anchor bolts is not fully utilized. In addition, when a non-uniform load is applied between the anchor bolts 221, the anchor bolt 221 to which a large tensile force is applied cannot withstand this, and as a result, the resistance to earthquake cannot be improved. there were.

JP 2005-248529 A

  Therefore, the present invention has been devised in view of the above-mentioned problems, and the object of the present invention is to use a vertical frame material as a concrete material when constructing a thin steel plate of 4 stories or more, for example. It is an object of the present invention to provide a structure for fixing a load-bearing wall of a thin and lightweight steel structure capable of making the axial force of each other more uniform when standing on a foundation through two anchor bolts.

  In order to solve the above-mentioned problems, the present inventor has a rise of a hole down hardware on the web of only one of the thin plate lightweight sections in the load-bearing wall that constitutes the column body by combining two thin plate lightweight sections. Fixed structure of thin plate lightweight steel bearing wall with two or more anchor bolts rising from the foundation inserted through the horizontal part of the hole down hardware and nuts screwed into the protruding threaded part Was invented.

  That is, the thin light weight steel structure bearing wall fixing structure according to claim 1 is a thin light weight steel web of only one of the load bearing walls constituting a column by combining two thin light weight steels. The rising part of the hole-down hardware is fixed, and two or more anchor bolts rising from the foundation are inserted through the horizontal part of the hole-down metal and the nut is screwed and fixed to the protruding thread part. Features.

  For example, when an earthquake occurs, a large horizontal force is applied to a thin and lightweight steel structure. In such a case, the axial force based on the shearing force is transmitted from the upper floor side to the lower floor side as the upper floor side is deformed in the horizontal direction larger than the lower floor side. And that axial force will be added to a volt | bolt. Since the volt | bolt is comprised by two, it becomes possible to fully bear this axial force.

  In addition, a bending moment is added to the column made of the vertical frame material and the shape steel, but this connection bolt is only arranged on the vertical frame material side and is arranged on the shape steel side. It is set to not be. For this reason, when the bearing wall is viewed from the front, the column body made of the vertical frame member and the shape steel is fixed from one side via the connecting bolt. For this reason, when a bending moment as described above is applied, rotation is relatively free from the attachment position of the connecting bolt as a base point without being restricted by rotation through the connecting bolt. Further, since the connecting bolt is disposed only on the vertical frame member 52 side, almost the same axial force is applied, and non-uniform axial forces are not applied to each other.

  In particular, when horizontal force or wind load during an earthquake is applied to a thin steel lightweight steel structure (steel house) that has four stories or more, the bending moment applied to the columnar frame made of the vertical frame material and shape steel is greater. However, according to the present invention, it is possible to eliminate the non-uniformity of the axial force between the connecting bolts. In addition, since it is possible to bear a uniform load on the two connecting bolts, a large tensile load is not applied to any one of the connecting bolts, and the local buckling strength is improved. Is also possible.

It is a perspective view of the fixation structure of the load-bearing wall of the thin plate lightweight shape steel structure to which this invention is applied. It is a front view of the fixation structure of the load-bearing wall of the thin plate lightweight shape steel structure to which this invention is applied. It is a top view of the fixation structure of the load-bearing wall of the thin plate lightweight shape steel structure to which this invention is applied. It is a figure which shows the attachment structure to the vertical frame material in a hole down metal fitting. It is another figure which shows the attachment structure to the vertical frame material in a hole down metal fitting. It is a figure for demonstrating operation | movement of the fixed structure of a load-bearing wall in the thin plate lightweight shape steel structure to which this invention is applied. It is an example which applies this invention to the fixed structure to the load-bearing wall with respect to a concrete foundation. It is a perspective view of the connection structure of the upper and lower floors in the thin plate lightweight shape steel construction to which this invention is applied. It is a front view of the connection structure of the upper and lower floors in the thin plate lightweight shape steel construction to which this invention is applied. It is a figure for demonstrating operation | movement of the connection structure of the upper and lower floors in the thin plate lightweight shape steel structure to which this invention is applied. It is the figure which modeled the dispersion | distribution degree of the axial force from an upper floor to a lower floor for every connection bolt. It is a figure for demonstrating the example which provided the reinforcement member between the upper flange and lower flange which were separated via the intermediate | middle web in a connection member. It is a figure for demonstrating the example which applied this invention also to the three-dimensional mixed structure. It is a figure which shows other embodiment in the connection structure which employ | adopts a three-dimensional mixed structure. It is a figure which shows the example of the joining structure of the load-bearing wall and foundation | foundation of the conventional thin plate light-weight steel structure. It is a figure which shows the detailed structure of the joining structure of the load-bearing wall and foundation | foundation of the conventional thin plate light-weight shaped steel structure. It is a figure for demonstrating transmission of the axial force when the horizontal force at the time of an earthquake acts on a building.

  Hereinafter, as an embodiment of the present invention, a thin-walled lightweight steel structure bearing wall fixing structure applied to a building structure such as a steel house of four stories or more will be described in detail with reference to the drawings. .

  The thin and light weight steel structure to which the bearing wall fixing structure to which the present invention is applied is applied. The frame material made of the thin and light weight steel is used as the main frame element of the entire building, and the wooden frame material and structure are partially used as necessary. It is constructed by combining a face material with a frame material made of thin lightweight steel. This thin lightweight steel frame material is composed of a grooved steel with a web and a flange integrally connected to both ends by bending a thin steel plate with a thickness of 0.4 mm or more and less than 2.3 mm. Has been.

  FIG. 1 is a perspective view of a thin-walled lightweight steel structure bearing wall fixing structure 10 to which the present invention is applied, and FIG. 2 is a front view thereof.

  The bearing wall fixing structure 10 includes a vertical frame member 52 and a steel frame 11 made of a thin lightweight steel forming the load bearing wall 5a of the upper floor, and a vertical frame made of a thin lightweight metal steel constituting the load bearing wall 5b of the lower floor. The material 53 and the shaped steel 12 are connected to each other through bolts 71 and 72 made of, for example, a normal bolt or a high-strength bolt.

  The load bearing wall 5a on the upper floor has a structural surface material 51a, a vertical frame material 52, and a shape steel 11. Each of the vertical frame member 52 and the shape steel 11 is made of a thin and lightweight shape steel. That is, the bearing wall 5a is a columnar body formed by combining two thin and light steel shapes. The vertical frame member 52 is formed of a frame member having a U-shaped cross section formed by bending side plates 62 and 63 on both sides of the central face plate 61. Incidentally, although not shown, a lip may be formed by bending the front ends of the side plates 62 and 63 inward. A structural surface material 51 a is attached to one side plate 62 or the shaped steel 11 in the vertical frame material 52. The structural frame member 51a is attached to the vertical frame member 52 and the shaped steel 11 through a screw fixing tool (not shown) such as a bolt or a drill screw. Although not shown, a lower frame material having a U-shaped cross section is provided along the lower edge portion of the structural surface material 51a, and the vertical frame material 52 and the shape are inserted into the lower frame material. In general, the steel 11 is configured to be erected at a predetermined interval. The section steel 11 is not limited to a rectangular cross section, and may be formed of a U-shaped frame material or any other shape.

  The structural face material 51 is formed of a steel folded plate or flat plate. As shown in the plan view of FIG. 3, the vertical frame member 52 is fixed by contacting another structural steel 11 through a center face plate 61.

  Further, a hole-down hardware 54 is attached to the vertical frame member 52. As shown in FIG. 4, the hole-down hardware 54 is attached to the central face plate 61 of the vertical frame member 52 via a screwing fixture 14 or the like, and the attachment plate 15 as a so-called rising portion. And a horizontal portion 16 projecting substantially horizontally from the lower end of the contact plate 15. The horizontal portion 16 has an insertion hole 16a through which the connecting bolt 71 (72) is inserted.

  That is, two connecting bolts 71 and 72 are attached and fixed to the hole-down hardware 54. Among these, the connection bolt 71 is closer to the structural surface material 51a, and the connection bolt 72 is more separated from the structural surface material 51a. In this way, one connecting bolt 71 and 72 is provided on each of the side closer to the structural surface material 51a and the side separated from the structural face material 51a.

  The hole-down hardware 55 is provided only on the vertical frame member 52 and is not provided on the other shape steel 11.

  The bearing wall 5b on the lower floor has a structural surface material 51b, a vertical frame material 53, and a shape steel 12. The vertical frame member 53 and the shape steel 12 are each composed of a thin and light weight shape steel. That is, the bearing wall 5b is a columnar body formed by combining two thin and light steel shapes. The vertical frame member 53 is formed of a frame member having a U-shaped cross section formed by bending side plates 65 and 66 on both sides of the central face plate 64. Incidentally, although not shown, a lip may be formed by bending the front ends of the side plates 65 and 66 inward. A structural surface material 51 b is attached to one side plate 64 or the shaped steel 12 in the vertical frame material 53. The structural frame member 51b is attached to the vertical frame member 53 and the shaped steel 12 through a screw fixing fixture (not shown) such as a bolt or a drill screw. Although not shown, a lower frame material having a U-shaped cross section is provided along the lower edge portion of the structural surface material 51b, and the vertical frame material 53 and the shape are inserted into the lower frame material. In general, the steel 12 is configured to be erected at a predetermined interval. The section steel 12 is not limited to a rectangular cross-section, and may be formed of a U-shaped frame material or any other shape.

  In addition, a hole down hardware 55 is attached to the vertical frame member 53. As shown in FIG. 5, the hole-down hardware 55 includes an attachment plate 25 that is attached to the central face plate 64 of the vertical frame member 53 via a screwing fixture 14 and the like. And a horizontal portion 26 projecting substantially horizontally from the upper end of the contact plate 25. The horizontal portion 26 has an insertion hole 26a through which the connecting bolt 73 (74) is inserted. A nut 77 is fixed to the upper end of the connecting bolt 73 (74).

  That is, two connecting bolts 71 and 72 are attached and fixed to the hole-down hardware 55. Among these, the connection bolt 71 is closer to the structural surface material 51b, and the connection bolt 72 is further away from the structural surface material 51b. In this way, one connecting bolt 71 and 72 is provided on each of the side close to and the side away from the structural face material 51b.

  The hole-down hardware 55 is provided only on the vertical frame 53 and is not provided on the other structural steel 12.

  Thus, the hole-down hardware 54 and 55 is provided only on the vertical frame members 52 and 53 side, and is not provided on the shape steel 11 and 12 side. For this reason, the connecting bolts 71 and 72 attached to the hole-down hardware 55 are also arranged only on the vertical frame members 52 and 53 side, and are not arranged on the section steels 11 and 12 side.

  Next, the operation of the bearing wall fixing structure 10 in the thin and lightweight steel structure to which the present invention is applied will be described with reference to FIG.

  For example, when an earthquake occurs, a large horizontal force is applied to a thin and lightweight steel structure. In such a case, the axial force based on the shearing force is transmitted from the upper floor side to the lower floor side as the upper floor side is deformed in the horizontal direction larger than the lower floor side. Then, the axial force is applied to the bolt 71 (72). Since the bolt 71 is composed of the two bolts 71 and 72, this axial force can be sufficiently carried.

  In addition, a bending moment is applied to the columnar body made of the vertical frame member 52 and the shape steel 11, but the connecting bolts 71 and 72 are provided only on the vertical frame member 52 side, It is set as the structure which is not arrange | positioned at the steel 11 side. For this reason, as shown in FIG. 6, when the load bearing wall 5 a is viewed from the front, the column body made of the vertical frame member 52 and the shaped steel 11 is fixed from one side via the connecting bolts 71 and 72. . For this reason, when a bending moment as described above is applied, rotation is relatively free from the mounting position of the connecting bolts 71 and 72 as a starting point without being restricted by rotation via the connecting bolts 71 and 72. It becomes possible. Further, since the connecting bolts 71 and 72 are disposed only on the vertical frame member 52 side, almost the same axial force is applied, and non-uniform axial forces are not applied to each other. .

  In particular, when a horizontal force or wind load is applied to a thin steel lightweight steel structure (steel house) with four or more stories, the bending moment applied to the vertical frame member 52 and the column made of the structural steel 11 However, according to the present invention, it is possible to eliminate the non-uniformity of the axial force between the connecting bolts 71 and 72. In addition, since it is possible to bear a uniform load on the two connecting bolts 71 and 72, a large tensile load is not applied to any one of the connecting bolts 71 and 72, and the local seat It is also possible to improve the yield strength.

  Furthermore, according to the present invention, the effective cross-sectional area may be adjusted to be larger on the thin lightweight section steel side to which the hole down hardware 54 is fixed, that is, on the vertical frame member 52 side. For example, as shown in FIG. 3, it can be seen that the hole-down hardware 54 is provided only on the vertical frame member 52 side, so that the effective cross-sectional area on the vertical frame member 52 side is larger than the shape steel 11 side. . For this reason, it is possible to bring the center of gravity of the column formed by the shape steel 11 and the vertical frame member 52 closer to the vertical frame member 52 side, and as a result, the axis of the connecting bolts 71 and 72 and the center of gravity of the column body. It is possible to further reduce the amount of eccentricity. If this amount of eccentricity can be reduced, it becomes possible to reduce the amount of eccentric bending when a bending moment due to an earthquake or the like is added to the column body constituted by the shape steel 11 and the vertical frame member 52, It becomes possible to further improve the local buckling strength.

  In the above-described embodiment, the case where the two connecting bolts 71 and 72 are disposed has been described as an example. However, the present invention is not limited to this. Even if there are three or more connecting bolts, they may be attached to the hole-down hardware 54 provided only on the vertical frame member 52 side.

  The present invention can be applied not only to a structure for fixing a load bearing wall on the second and higher floors of a thin and light steel structure, but also to a case where the load bearing wall 5a is fixed to a concrete foundation 147 as shown in FIG. is there.

  In such a case, an anchor bolt 144 is provided as an alternative to the connecting bolts 71 and 72 described above. The lower end of the anchor bolt 144 is embedded in the concrete foundation 147. Similarly, in the first floor portion, the hole-down hardware 54 is provided only on the vertical frame member 52 side and is not provided on the shape steel 11 side. For this reason, the anchor bolt 144 is also disposed only on the vertical frame member 52 side, and is not disposed on the structural steel 11 side. In addition, although a lower frame material is provided along the lower edge of the structural surface material 51a, illustration is abbreviate | omitted. The anchor bolt 144 is embedded in the concrete foundation 147 by inserting a lower frame material (not shown). Even if there are three or more anchor bolts 144, the same effect can be obtained.

  Further, when the bearing wall 5a is fixed to the concrete foundation 147, the above-described operation can be performed in the same manner. That is, when an earthquake occurs, an axial force based on the shearing force is transmitted from the upper floor side to the lower floor side. The axial force is applied to the anchor bolt 144, which is disposed only on the vertical frame member 52 side, so that rotation restraint is not applied, and the anchor bolt 144 Relatively free rotation is possible with the mounting position as a base point. Further, since the anchor bolt 144 is disposed only on the vertical frame member 52 side, substantially the same axial force is applied, and non-uniform axial forces are not applied to each other. That is, since it is possible to bear a uniform load on the two anchor bolts 144, a large tensile load is not applied to any one of the anchor bolts 144, and the local buckling strength is improved. It is also possible to make it.

  In addition, this invention is not limited to embodiment mentioned above, Furthermore, the following technical thought may be reflected.

  FIG. 8 is a perspective view of the connection structure 1 of the upper and lower floors in the thin and light weight steel structure to which the present invention is applied, and FIG.

  In the connecting structure 1 on the upper and lower floors, the same components and members as those of the load-bearing wall fixing structure 10 described above are denoted by the same reference numerals, and the following description is omitted.

  The connection structure 1 on the upper and lower floors includes a first vertical frame member 52 made of a thin lightweight steel forming the load bearing wall 5a of the upper floor, and a second lightweight frame steel made of a thin lightweight light steel constituting the load bearing wall 5b of the lower floor. The vertical frame member 53 is connected via the connecting member 8.

  Further, a hole-down hardware 54 is attached to the vertical frame member 52. Two connecting bolts 71 and 72 are attached and fixed to the hole-down hardware 54. Among these, the connection bolt 71 is closer to the structural surface material 51a, and the connection bolt 72 is more separated from the structural surface material 51a. In this way, one connecting bolt 71 and 72 is provided on each of the side closer to the structural surface material 51a and the side separated from the structural face material 51a.

  A hole-down hardware 55 is attached to the vertical frame member 53. Two connecting bolts 73 and 74 are attached and fixed to the hole-down hardware 54. Among these, the connection bolt 73 is closer to the structural surface material 51b, and the connection bolt 74 is further away from the structural surface material 51b. Thus, one connecting bolt 73, 74 is provided on each of the side close to the structural face material 51b and the side away from it.

  The connecting member 8 is made of a so-called H-shaped steel having an upper flange 82, an intermediate web 81 extending downward from the upper flange 82, and a lower flange 83 attached to the lower end of the intermediate web 81. . The upper flange 82 is formed with an insertion hole 101 for inserting the connection bolts 71 and 72, and the lower flange 83 is formed with an insertion hole 102 for inserting the connection bolts 73 and 74. Yes. A nut 76 is screwed and fixed to the lower ends of the connection bolts 71 and 72 protruding downward from the insertion hole 101, and the lower ends of the connection bolts 73 and 74 protruding downward from the insertion hole 102. The nut 77 is fixed by screwing.

  The intermediate web 81 is attached so as to separate the insertion positions of the connecting bolts 71 and 72 in the upper flange 82. Similarly, the intermediate web 81 is attached so as to separate the insertion positions of the connecting bolts 73 and 74 in the lower flange 83.

  Incidentally, the connecting member 8 may be provided with a reinforcing member 68 as shown in FIG. For example, the reinforcing member 68 may be a metal frame member bent in a U-shaped cross section. The reinforcing member 68 may be provided, for example, on the side separated from the structural face material 51 among the upper flange 82 and the lower flange 83 separated by the intermediate web 81.

  Further, the connecting member 8 itself may be provided with a locking member 69 made of channel steel as shown in FIG. 8 between the flanges.

  Next, operation | movement of the connection structure 1 of the upper and lower floors in the thin plate lightweight shape steel construction to which this invention is applied is demonstrated using FIG.

  For example, when an earthquake occurs, a large horizontal force is applied to a thin and lightweight steel structure. In such a case, the axial force based on the shearing force is transmitted from the upper floor side to the lower floor side as the upper floor side is deformed in the horizontal direction larger than the lower floor side. Incidentally, the arrows shown in FIG. 10 indicate stress transmission paths. The axial force generated on the upper floor is transmitted along the structural floor material 51a on the upper floor side. The transmitted axial force is transmitted to the lower floor via the connecting bolts 71 and 72, but a large amount of axial force flows especially to the connecting bolt 71 near the structural surface material 51a, so that it is separated from the structural surface material 51a. The connecting bolt 72 has a phenomenon that not much axial force flows. That is, the non-uniformity of the axial force to be transmitted between the connecting bolts 71 and 72 is large. However, the axial force transmitted to the connecting bolts 71 and 72 is transmitted downward through the intermediate web 81. For this reason, the axial force transmitted from each connecting bolt 71, 72 is combined in the intermediate web 81. Then, the axial force combined in the intermediate web 81 is transmitted in the downward direction as it is, and is almost equally separated at the lower flange 83 or the connecting bolts 73 and 74. Then, the separated axial force is transmitted downward as it is.

FIG. 11 shows a case where the upper and lower floors are connected with continuous connection bolts 71 and 72 as in the bearing wall fixing structure 10 to which the present invention is applied, and a connection member 8 is newly provided as in the upper and lower floor connection structure 1. In this case, the degree of dispersion of the axial force from the upper floor to the lower floor is modeled for each connecting bolt. In FIG. 11, N ₄ is an axial force applied from the fourth floor to the lower floor, N ₃ is an axial force applied from the third floor to the lower floor, N ₂ is an axial force applied from the second floor to the lower floor, N ₁ is an axial force applied from the first floor to the foundation.

In this model, in the method of connecting the upper and lower floors with the connecting bolt 71 (72) shown on the left side, first, in the fourth floor portion, the connecting bolt 28a close to the structural face material 41 is 0.8N ₄ , far from the structural face material 41. 0.2N ₄ is added to the connecting bolt 28b. Similarly, in the third floor part, 0.8N in connecting bolt 28a close to the structure surface member 41 _3, is 0.2 N ₃ distant connecting bolt 28b from the structured surface material 41 is newly added, has been transferred from the fourth floor Since force is added, in the process of transmitting force from the third floor to the second floor, 0.8N ₄ + 0.8N ₃ is applied to the connecting bolt 28a, and 0.2N ₄ + 0.2N is applied to the connecting bolt 28b. ₃ will be added. By repeating such a mechanism, 0.8N ₄ + 0.8N ₃ + 0.8N ₂ + 0.8N ₁ is connected to the connecting bolt 28a in the process of finally transmitting the force from the first floor to the foundation. 0.2N ₄ + 0.2N ₃ + 0.2N ₂ + 0.2N ₁ is transmitted to the bolt 28b. That is, in the method of connecting the upper and lower floors with the connecting bolts 71 (72) shown on the left side, the axial force applied between the connecting bolts 28a and 28b connecting the first floor portion and the foundation is not uniform.

On the other hand, in the method using the connecting member 8 shown on the right side, first, in the fourth floor portion, the connecting bolt 71 near the structural surface material 51 is 0.8N ₄ and the connecting bolt 72 far from the structural surface material 51 is connected. 0.2N ₄ is added, but these are combined in the intermediate web 81 and separated substantially evenly, and axial force is transmitted to the connecting bolts 73 and 74 almost equally by 0.5N ₄ respectively. In 3 floor portion, 0.8N in connecting bolt 71 close to the structure surface member 51 _3, is 0.2 N ₃ distant connecting bolts 72 from the structural surface material 51 is newly added, the force is added which has been transmitted from the fourth floor However, since they are equally separated from each other, 0.5N ₄ + 0.8N ₃ is applied to the connecting bolt 71 and 0.5N ₄ + 0.8N ₃ is applied to the connecting bolt 72 in the process of transmitting force from the third floor to the second floor. , 0.5N ₄ + 0.2N ₃ is added. By repeating such a mechanism, 0.5N ₄ + 0.5N ₃ + 0.5N ₂ + 0.8N ₁ is connected to the connection bolt 71 in the process of finally transmitting the force from the first floor to the foundation. 0.5N ₄ + 0.5N ₃ + 0.5N ₂ + 0.2N ₁ is transmitted to the bolt 72. That is, in the method using the connecting member 8, it is possible to make the axial force applied between the connecting bolts 71 and 72 connecting the first floor portion and the foundation more uniform.

  As described above, the connecting structure 1 on the upper and lower floors adopts a configuration in which the two connecting bolts 71 and 72 are separated via the intermediate web 81 and the two connecting bolts 73 and 74 are separated via the intermediate web 81. By doing so, the non-uniform axial force transmitted from the upper floor can be combined in the intermediate web 81 and separated substantially evenly when this is transmitted to the lower floor.

  For this reason, in the connection structure 1 on the upper and lower floors, even when a high-rise building with four or more floors is used and a large earthquake occurs, the stress transmitted from the upper floor is separated almost evenly. Thus, the connection bolts 71 and 72 can be transmitted, and no large axial force (shearing force) is applied to any one of the connection bolts 71 and 72, thereby preventing the connection bolts 71 and 72 from being damaged. Therefore, it is possible to improve the earthquake resistance.

  In the above-described embodiment, the description is made by taking as an example a configuration in which the two connecting bolts 71 and 72 are separated through the intermediate web 81 and the two connecting bolts 73 and 74 are separated through the intermediate web 81. However, the present invention is not limited to this, and even if there are three or more connecting bolts, they may be separated by the intermediate web 81.

  Further, as described above, by providing the reinforcing member 68 on the side separated from the structural surface material 51 between the upper flange 82 and the lower flange 83 separated by the intermediate web 81, as shown in FIG. Even if the axial force transmitted from the upper floor is not uniform, the axial force can be concentrated on the side away from the structural face material 51. Further, by providing the connecting member 8 inside the anti-slip member 69, the anti-slip member 69 can counter the resistance moment generated by the non-uniform axial force transmitted from the upper floor. It becomes.

  The present invention may be applied to a so-called three-dimensional mixed structure rather than a thin steel plate having four or more stories. This three-dimensional mixed structure is a so-called piloti structure. In this three-dimensional mixed structure, the first floor portion is mainly composed of pillars, but FIG. 13 shows the connection structure of the upper floor and the lower floor. In the connection structure 6, the same components and members as those of the connection structure 1 described above are denoted by the same reference numerals, and the following description is omitted.

  The steel beam 180 constitutes the upper end of the first floor portion in the piloty structure. The steel beam 180 is made of H-shaped steel, and an upper flange 182 is provided at the upper end of the web 181 and a lower flange 183 is provided at the lower end.

  A connecting member 170 is attached to the upper surface of the steel beam 180. The connecting member 170 has an H-shaped cross section including an upper flange 172, an intermediate web 171, and a lower flange 173.

  A connecting bolt 191 is inserted through the upper flange 172 of the connecting member 170, and an upper end thereof is fixed to a hole-down hardware 54 attached to the vertical frame member 52 via a nut 76. A connecting bolt 192 is inserted into the lower flange 173 of the connecting member 170. The connection bolt 192 protrudes upward from the lower surface of the upper flange 182 of the steel beam 180 described above, and is inserted into the lower flange 173 of the connection member 170 and fixed at the upper end with the nut 76. As a result, the connecting member 170 is firmly fixed to the steel beam 180. At this time, the insertion position of the connecting bolt 192 is a position separated by the intermediate web 171 in the connecting member 170. Similarly, the insertion position of the connecting bolt 191 is a position separated by the intermediate web 171.

  Therefore, even in such a three-dimensional mixed structure, by adopting a configuration in which the two connecting bolts 191 are separated via the intermediate web 171 and the two connecting bolts 192 are separated via the intermediate web 171, The non-uniform axial force transmitted from the floor can be combined in the intermediate web 171 and separated substantially evenly when this is transmitted to the lower floor.

  For this reason, even in the connection structure 6 that adopts such a piloty structure, even if it is a high-rise building of four stories or more, and a large earthquake occurs, it is transmitted from the upper floor. It becomes possible to transmit the stress to the steel beam 180 by separating the stress almost evenly, and no large axial force (shearing force) is applied to any one of the connecting bolts 191, thereby improving the earthquake resistance. It becomes possible.

  FIG. 14 shows another embodiment of the connection structure 6 that employs this three-dimensional mixed structure. In this other embodiment, the configuration of the connecting member 170 and the steel beam 180 is the same as that described above, except that a connecting bolt 195 is used instead of the connecting bolts 191 and 192.

  A connecting bolt 195 is passed through the upper flange 182 in the steel beam 180 and the lower flange 173 and the upper flange 172 in the connecting member 170. An upper end of the connection bolt 195 protrudes from the upper flange 172, and a nut 76 is screwed to the upper end. The insertion position of the two connecting bolts 195 is a position separated by the intermediate web 171.

  The other embodiments in such a connection structure 6 also have the above-described effects.

  Further, a vertical rib 197 may be interposed between the upper flange 172 and the lower flange 173. The vertical rib 197 is made of, for example, a steel plate, and the upper end thereof is fixed to the upper flange 172 by welding or the like, and the lower end thereof is fixed to the lower flange 173 by welding or the like.

  By inserting such vertical ribs 197, the vertical ribs 197 themselves can bear the compressive force applied from the vertical direction.

DESCRIPTION OF SYMBOLS 1, 6 Connection structure 5 Bearing wall 8 Connection member 10 Fixation structure 11, 12 Shape steel 14 Fixture 15 Fixing plate 16 Horizontal part 28 Connection bolt 41, 51 Structure surface material 52, 53 Vertical frame material 54, 55 Hole down metal 61, 64 Center face plate 62, 63, 65, 66 Side face plate 68 Reinforcement member 69 Anti-roll member 71, 72, 73, 74 Connection bolt 76, 77 Nut 81, 171 Intermediate web 82, 172 Upper flange 83, 173 Lower flange 101 102 Insertion hole 144 Anchor bolt 147 Concrete foundation 170 Connection member 180 Steel beam 181 Web 182 Upper flange 183 Lower flange 191, 192, 195 Connection bolt 197 Vertical rib

Claims (3)

The rising part of the hole down hardware is fixed to the web of only one of the thin plate lightweight section steels in the bearing wall that composes the column by combining two thin sheet lightweight sections.
Two or more anchor bolts rising from the foundation are inserted through the horizontal part of the hole-down hardware, and a nut is screwed and fixed to the protruding thread part. Fixed structure. Applicable to thin steel lightweight section of 4 stories or more,
The rising portion of the hole down hardware is fixed to the thin lightweight steel web of only one of the load bearing walls arranged on the second floor or higher,
2. A thin lightweight plate according to claim 1, wherein two or more bolts rising from a lower floor are inserted through the horizontal portion of the hole-down hardware, and a nut is screwed and fixed to the protruding screw portion. Steel bearing wall fixed structure. The thin plate according to claim 1 or 2, wherein the effective cross-sectional area of the thin and light weight steel side to which the hole-down hardware is fixed is adjusted to be larger among the two thin and light weight steel shapes. Lightweight steel structure bearing wall fixing structure.

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