JP2009197570A - Direct-connected bent reinforced brace dispensing with connector of earthquake-resisting wall and portal rigid frame of wooden framework building, and construction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve points that a wooden building collapses because connectors and constituent members come apart and that the wooden building is destroyed because a frame becomes a parallelogram. <P>SOLUTION: A joint function of a direct-connected bent reinforced brace and a wood part includes two functions which are a drawing function of a washer resisting so that a connection does not come apart, and a shearing function of plate steel resisting so that the frame does not become the parallelogram. Consequently, a nail, a screw, a bolt and a drawing hardware of the connector are not required. When a horizontal seismic force acts on an earthquake-resisting wall and a portal rigid frame of the direct-connected bent reinforced brace, the bent reinforced brace bears tensile stress, and only compressive stress is generated to the mutual contact surface of wood parts of the connection. The drawing hardware is thereby unnecessary. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a reinforcing bar brace used for a wooden frame building.

  Conventional seismic walls are wooden braces, reinforcing braces, earthen walls, and S56 Construction Ministry Notification No. 1100 face materials, earthen walls, and lattices. The joint to the wooden shaft is a nail. Screw. It is a volt | bolt, and the joining method and the number of joining tools are in H12 Construction Ministry Notification No. 1460. This force transmission of the connector is a shear resistance. There is also a minister-approved earthquake-resistant wall.

  There was not.   Fully compliant with the Building Standards Act, “Amendment” of Building Knowledge / Exnerium Gym. [Wooden house] Perfect and manual resistant to earthquakes. p-120.2003. Taisho Ono, Japan Housing and Wood Technology Center Extension Department

  The conventional failure mode of the shear wall is shearing in the fiber direction in bolt joint, splitting in the direction perpendicular to the fiber, and missing in nail screw joint. In addition, the fittings for attracting hardware such as hole-down hardware and pillars are nails. Screw. It is a bolt and the form of destruction is the same.

  In addition, during a large earthquake, the joint is first destroyed while no large seismic force is input to the wooden pillars and wooden horizontal members of the shaft. The strength of the shaft member alone can counteract large earthquake forces. However, it collapses without showing its ability. The cause is in the joint.

  The cause of the collapse of wooden buildings is that the joints and components are separated. The cause of the collapse is that the shaft becomes a parallelogram. It is a problem to solve these points.

  The joining function of the directly connected bending rebar brace and the wood part of the present invention is the pulling function of the washer 11 that resists the joints from breaking apart and the shear of the flat steel 12 that resists the shaft part from becoming a parallelogram. It has two functions. Therefore, the nail of the connector. Screw. Bolts and attracting hardware are unnecessary.

  In addition, the vertical component of the stress of the directly-coupled bending rebar brace is transmitted to the xylem by the surface of the washer 11 and the horizontal component is transmitted by the surface of the flat steel plate 12. Therefore, by increasing the surface, that is, by increasing the contact area with the xylem, the indentation rigidity is increased. Therefore, the horizontal rigidity of the shaft portion can be changed by making the surface area large and small, which is convenient.

  In addition, when a horizontal seismic force acts on the shear wall and portal ramen of a directly-bending reinforcing bar brace, the directly-bending reinforcing bar brace bears a tensile stress and only compressive stress is generated at the contact surface between the wood parts of the joint. . Therefore, the attracting hardware is unnecessary.

  Further, the transmission of force to the wood part of the directly connected bending rebar brace acts on one point of the bent part 4A or 4B of the brace shaft part and is not eccentric. Therefore, the horizontal load deformation rigidity is high.

  Further, the pulling-out of the wooden pillar due to the overturning moment resists the bending strength of the wooden horizontal member 7, so that the attracting metal is not necessary. In addition, the seismic wall on the first floor is solved by connecting directly to anchor bolts that are buried obliquely based on the turnbuckles of directly connected bending rebar braces.

  In the case of the load-bearing wall of the upper and lower floors, the directly connected bending reinforcement braces are connected to each other, and the upper and lower floors become a continuous body. In terms of inclination, it is also easy to calculate the interlaminar deformation angle and estimate the building behavior during an earthquake.

  Moreover, in the safety limit calculation, the fracture of the directly connected bending rebar brace is the destruction of the building. Therefore, it is easy to estimate the safety limit interlayer deformation angle from the estimation of the building failure and the amount of elongation of the plastic range of the directly connected bending rebar brace.

  In addition, when the washer 11 has the cross-sectional size of the wooden pillar, the rigidity of the joint of the wooden pillar is equal to the rigidity of the fitting of the wooden washer, and the rigidity of each joint becomes the same. Deformation angle calculation is simple.

  In addition, it is easy to change the rigidity of the shear wall by adjusting the turnbuckle tightening amount. Therefore, changing the rigidity of the entire building is also easy. The amount of input to each component member by tightening is within the long-term allowable proof stress of each component member.

  As shown in FIG. 9, the pretension is increased by turnbuckles in the direction of 15C and 15D from the directly connected bending brace braces 15A and 15B, and a compression load is generated at the joint portion 16 of the wooden horizontal member. You don't need any attracted hardware. Note that even if the interlayer deformation angle of the shaft changes due to the horizontal force of the earthquake, the compression load of the butt does not change. Naturally, no tensile stress is generated in the mouth.

  Even in the seismic reinforcement of existing buildings, it is easy to cut the wooden frame material to which the directly connected bending rebar braces are attached by drilling and chiseling, and correcting the falling of the wooden pole can be done by tightening the turnbuckle. is there.

  In addition, the directly connected bent steel brace is easy to install and remove, and considering the case where the existing building is demolished and transferred, the work efficiency is good, and it can be reused and the cost is reduced.

The constituent members of the present invention are a flat steel, a washer, a triangular washer and a nut in addition to a directly-coupled bending rebar brace. Since the number of members is small, the member cost is reduced and the working efficiency is improved.

  Embodiments of the present invention will be described below.

  In the case of a new construction, attach it to a wooden horizontal member on the ground.

  Assuming that the length of the wooden horizontal member is 270 mm and the inclination of the brace is 1/3, how to install the bent reinforcing bar brace of FIG. 1 and the calculation method of the size of the insertion space of the wooden horizontal member will be described.

Calculation of the size of the insertion space (7C) Wood horizontal member 270mm x 1/2 x 1/3 x 1/2 + brace M16mm = 38.5mm
38.5 mm <drill hole 30 mm + flat steel plate thickness 9 mm = 39 mm ... ok

  Drill a 30 mm diameter drill hole in the wooden cross member 7, flat plate size (thickness 9 mm, width 30 mm, depth 40 mm) with a chisel, then remove the brace shaft 4 from the turnbuckle, and a washer 11 Into 5A,

  Next, 5A of the brace shaft portion is inserted through the drill hole in the lower end portion (7B) of the wooden horizontal member, and the flat steel plate 12 is installed. If the brace shaft part is bent and does not buffer and enter into the flat steel plate, the brace shaft part is rotated 90 degrees and shifted downward to install the flat steel plate.

  next. The washer 11 is attached to 5A, the triangular washer 13 is fastened, and the screw nut 14 is turned clockwise.

  By attaching the turnbuckle 3 and the brace shaft portion 1 when assembling the shaft assembly, it is possible to omit the temporary bracing of the wood.

  Since the force is applied in the bending direction of 4 of the brace shaft portion and the method of attaching the directly connected bending reinforcing bar braces of FIGS. 2 and 3, flat steel is installed on the inner corner side of the bent portion. Therefore, the portion of the wooden horizontal member that engages with the portion is processed.

  The difference in the processed part of the wooden horizontal member is the number and direction of the bent parts.

Example of structural calculation ・ Beige wood sfc150kgf / cm ² , sfm50kgf / cm ²
Flat steel surface 30mm × 40mm horizontal input short-term allowable strength
3 cm × 4 cm × 150 kgf / cm ² = 1800 kgf
Vertical input short-term allowable strength of 100 mm square washer surface 10 cm × 10 cm × 50 kgf / cm ² = 5000 kgf
Converted to horizontal force 5000kgf × 1/3 = 1666kgf
min (1800 kgf, 1666 kgf) = 1666 kgf
1666kgf × 1 / 200kgf ≒ 8 ・ ・ ・ Equivalent to a wall magnification of 8

Front view of the shaft part of a directly-coupled bending rebar brace connected in the vertical direction bent in two directions in the same direction Front view of the shaft part of a directly connected bending rebar brace connected in the horizontal direction bent in two different directions Front view of a straight bending bend rebar brace that is not connected in the vertical and horizontal directions. Side view of FIGS. The top view of the wooden crosspiece processed to insert the directly-connected bending rebar brace of Fig. 1 Vertical section of FIG. Fig. 6 shows the direct-bending rebar brace, flat steel plate, and washer of Fig. 1 attached to Fig. 6. Fig. 7 shows a washer and a triangular washer attached and tightly attached with a nut. Overall view of the building frame with the directly connected bending braces of Figs.

Explanation of symbols

1. Shaft part of directly connected bending rebar brace
2. Directly bent rebar brace battledore
3. Turnbuckle
4). Shaft part of a directly connected bending reinforcing steel brace inserted through a wooden horizontal member
4A. The part where the shaft part of the directly connected bending rebar brace inserted into the wooden horizontal member engages with the upper end of the wooden horizontal member
4B. The part where the shaft part of the directly connected bending rebar brace inserted into the wooden horizontal member engages with the lower end of the wooden horizontal member
5A. Right turn screw part of directly connected bending rebar brace
5B. Left turn screw part of directly connected bending rebar brace
6). High strength bolt hole
7). Wooden horizontal material
7A. Top end of wooden horizontal member
7B. Lower end of horizontal wooden member
7C. Insertion of wooden timber
8A. Right side of wooden pole
8B. Left side of wooden pole
9. 9. Drill hole for inserting the shaft part (4) of a directly connected bending rebar brace into a wooden horizontal member. 10. Empty space for installing flat steel (12) on wooden horizontal members Washer 12. Flat steel 13. Triangular washer 14. Right turn screw nut 15A. Directly connected bending steel brace 15B. Directly connected bending steel brace 15C. Directly connected bending steel brace 15D. Directly connected bending rebar brace 16. 16. Joints for wooden horizontal members Anchor bolt 18. Concrete foundation

Claims (7)

  The shaft part (4) of the reinforcing bar brace having the battledore (2) and the turnbuckle (3) is inserted into the wooden horizontal member (7), and the upper part (7A) and the lower end part (7B) of the wooden horizontal member are axial parts. Directly connected bent steel brace that is bent at two locations (4A, 4B) in (4).   The shaft part (4) of the reinforcing bar brace having the battledore (2) and the turnbuckle (3) is inserted into the wooden horizontal member (7), and the shaft part (4) is engaged with the lower end part (7B) of the wooden horizontal member. Directly-bonded rebar brace with one part bent (4B)   A flat plate steel or a cylindrical steel is used to prevent the shaft portion (4) from being sunk into the wooden horizontal member in the bent portion (4A, 4B) of the shaft portion (4) of the directly-bending rebar brace of claims 1 and 2. Directly connected bending rebar brace   The shaft portion (4) of the reinforcing bar brace having the battledore (2) and the turnbuckle (3) is inserted into the wooden pole, and the shaft portion (4) is engaged with the right side surface (8A) and the left side surface (8B) of the wooden column. Directly connected bent steel brace with two bent parts (4A, 4B)   The shaft part (4) of the reinforcing bar brace having the battledore (2) and the turnbuckle (3) is inserted into the wooden pole, and the left side surface (8B) of the wooden pole is engaged with the part (4B) where the shaft part (4) is engaged. Directly-bending rebar brace with one point bent   Direct connection where the shaft portion (4) has a flat steel plate or a tubular steel for preventing the shaft portion (4A) from being dented into the wooden pole to the bent portion (4A, 4B) of the shaft portion (4) of the directly connected bent rebar brace according to claims 4 and 5. Bending rebar brace   A construction method in which the shaft assembly becomes a continuous body by directly connecting the directly-bending rebar braces of claims 1, 2, 3, 4, 5, and 6 vertically or laterally.

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