JP2007262716A - T-shaped sectional member for truss or buckling stiffening structure of cross-shaped sectional member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a buckling stiffening structure for stiffening against buckling by assembling two buckling stiffening members having a substantially U-shaped section to a T-shaped sectional member for a truss or a cross-shaped sectional member in a circumscribed state. <P>SOLUTION: To two right-angled sides of the T-shaped sectional member 20, between two large and small buckling stiffening members 5, 6 having a substantially U-shaped cross section, one stiffening member 6 is disposed with a web 6a right-angled to a T-shaped leg part 20a, and the other stiffening member 5 is disposed with a web 5a parallel to a T-shaped head part 20b. They are combined to surround in a circumscribed state, and the flange parts 5b, 6b of the buckling stiffening members 5, 6, overlaid one on the other inside and outside are joined and assembled to the T-shaped sectional member 20 to achieve stiffening against buckling. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention provides a buckling stiffening structure in which two buckling stiffening members having a substantially U-shaped cross section are assembled to a T-shaped cross-section member for a truss or a cross-shaped cross-section member in a circumscribing state. It belongs to the technical field.

A low-rise steel building constructed with a truss beam with a T-shaped cross-section member or a cross-shaped cross-section member, which was built before the implementation of the new seismic design method in 1981, was constructed. In some cases, the seismic performance of the entire building does not satisfy the required performance due to insufficient buckling strength. When a horizontal force such as an earthquake acts on this low-rise steel frame building, it receives a compressive force in the axial direction of the truss beam, causing a deflection due to a buckling phenomenon, and there is a risk that the proof stress is rapidly reduced.
Conventionally, a buckling stiffening structure in which a buckling stiffening member is attached in an arrangement surrounding a brace material in a circumscribed state has already been disclosed (see Patent Documents 1, 2, and 3 below). However, the truss beam of the T-shaped cross-section member or the cross-shaped cross-section member is still difficult to buckle, and the buckling-stiffening structure of the T-shaped cross-section member or the cross-shaped cross-section member cannot be observed.

JP 2001-132112 A JP 2000-328669 A Japanese Patent No. 3451327

  An object of the present invention is to circumscribe two buckling stiffening members having a substantially U-shaped cross-section to an existing truss-shaped cross-section member or cross-shaped cross-section member assembled into a T-shaped cross-section or a cross-shaped cross-section. Buckling of T-shaped cross-section members for trusses or cross-shaped cross-section members that are assembled and joined with combined bolts to be assembled and stiffened and buckled, and have excellent workability and safety, and can be easily and quickly buckled and stiffened. It is to provide a stiffening structure.

As means for solving the above problems, a buckling stiffening structure for a T-shaped cross-sectional member for a truss according to the invention described in claim 1 is:
Of the two large and small buckling stiffening members 5 and 6 having a substantially U-shaped cross section with respect to two perpendicular sides of the T-shaped cross-section member 20, one stiffener 6 has its web 6a attached to T The other stiffener 5 is combined in an arrangement surrounding the web 5a parallel to the T-shaped head 20b so as to be circumscribed, and overlapped inside and outside. The flange portions 5b and 6b of the buckling stiffening members 5 and 6 are joined with bolts 7 and assembled to the T-shaped cross-section member 20 to be buckled and stiffened.

The invention described in claim 2 is the buckling stiffening structure of the T-shaped cross-section member for truss described in claim 1,
The gap adjusting material 10 is provided between the flange portions 5b and 6b of the two large and small buckling stiffening members 5 and 6 that overlap inside and outside, and the flange portions 5b and 6b are joined by the bolt 7 It is characterized by.

The invention described in claim 3 is the buckling stiffening structure of the T-shaped cross-sectional member for truss described in claim 1 or 2,
Between the inner surface of the web 5a of the buckling stiffening member 5 having a substantially U-shaped cross section and the T-shaped cross-section member 20, a plate-shaped buckling stiffening member 11 is provided to fill the gap between the two. It is characterized by being.

The invention described in claim 4 is a buckling stiffening structure for a T-shaped cross-sectional member for a truss according to any one of claims 1 to 3,
Angle-shaped positioning members 9 and 9 are provided so as to sandwich the T-shaped leg portion 20a of the T-shaped cross-section member 20 on the inner surface of the web 6a of the buckling stiffening member 6 having a substantially U-shaped cross section. It is characterized by being.

The invention described in claim 5 is the buckling stiffening structure of the T-shaped cross-sectional member for truss described in any one of claims 1 to 4,
The T-shaped cross-section member 20 is a chevron steel assembly member obtained by combining two angle steels back to back and assembled into a T-shaped cross section, or a cut T-shaped steel member.

The invention described in claim 6 is a buckling stiffening structure of a cross-shaped cross-sectional member for a truss.
The web 6a of two buckling stiffening members 6 and 6 having approximately the same size and having a substantially U-shaped cross section with respect to two symmetrically arranged sides among the four orthogonal sides intersecting the cross-shaped cross-sectional member 21; 6a is arranged in a right angle arrangement so as to be circumscribed, and a common joining plate 13 is installed on the flange portions 6b and 6b of the buckling stiffening members 6 and 6, and the flange of each buckling stiffening member 6 is provided. The parts 6b and 6b are joined with a common joining plate 13 and a bolt 7 and assembled to the cross-shaped cross-section member 21 to be buckled and stiffened.

The invention described in claim 7 is the buckling stiffening structure of the cross-shaped cross-sectional member for truss described in claim 6,
Flange portions 6b and 6b of two substantially equal buckling stiffening members 6 and 6 combined in an arrangement surrounding the cross-shaped cross-section member 21 in a circumscribed state, and a common joint installed on the flange portions 6b and 6b The gap adjusting material 10 is provided between the plate 13 and the flanges 6b and 6b of the buckling stiffening members 6 are joined to each other by a common joining plate 13 and bolts 7.

The invention described in claim 8 is the buckling stiffening structure of the cross-shaped cross-sectional member for truss described in claim 6 or 7,
Angle-shaped positioning members 9 and 9 are provided on the inner surface of the web 6a of the buckling stiffening member 6 having a substantially U-shaped cross section so as to sandwich the opposing portion 21a of the cross-shaped cross-section member 21. It is characterized by.

The invention described in claim 9 is the buckling stiffening structure of the cross-shaped cross-sectional member for truss described in any one of claims 6 to 8,
The cross-shaped cross-section member 21 is a chevron steel assembly member in which four angle steels 3 are combined back to back and assembled into a cross-shaped cross section.

The invention described in claim 10 is a buckling stiffening structure of a T-shaped cross-sectional member for a truss or a cross-shaped cross-sectional member according to any one of claims 1 to 9,
As the buckling stiffening members 5, 6 (or 6, 6) to be assembled to the T-shaped cross-section member 20 or the cross-shaped cross-section member 21, a light-section steel or a lip-shaped steel is used. It is characterized by.

  The buckling stiffening structure of the T-shaped cross-section member or the cross-shaped cross-section member for the truss according to the present invention includes two buckling stiffening members 5, 6 (or 6, 6) to the T-shaped cross-section member 20 or the cross-shaped cross-section member 21. ) Is a simple structure that is assembled to the T-shaped cross-section member 20 or the cross-shaped cross-section member 21 by simply joining with bolts 7 and enclosing it in a circumscribing state, and does not require any troublesome work such as welding. Therefore, it is excellent in workability and safety, and can be buckled and stiffened easily and quickly.

  Further, since it is possible to use the existing light-weight shaped steel, such as the grooved steel 5 or the grooved steel 6 with a lip, a plate-shaped buckling stiffening to fill the gap or to provide a hole for passing the bolt 7 is possible. It can be carried out with simple processing to the extent that the member 11, the gap adjusting material 10 and the positioning member 9 are installed, and yet the lightweight steel is light and strong, so it can be constructed with a simple scaffold or work vehicle. Excellent and can greatly contribute to cost reduction.

  Of the two large and small bending stiffeners 5 and 6 having a substantially U-shaped cross section with respect to two perpendicular sides of the T-shaped cross-section member 20, one stiffener 6 has its web 6a in a T-shape. The buckling is arranged at right angles to the legs 20a, and the other stiffener 5 is combined with the arrangement surrounding the web 5a in a circumscribed state in parallel with the T-shaped head 20b. The flange portions 5b and 6b of the stiffening members 5 and 6 are joined to each other with a bolt 7 and assembled to the T-shaped cross-section member 20 to be buckled and stiffened.

  The web 6a of two buckling stiffening members 6 and 6 having approximately the same size and having a substantially U-shaped cross section with respect to two symmetrically arranged sides among the four orthogonal sides intersecting the cross-shaped cross-sectional member 21; 6a is arranged in a right angle arrangement so as to be circumscribed, and a common joining plate 13 is installed on the flange portions 6b and 6b of the buckling stiffening members 6 and 6, and the flange of each buckling stiffening member 6 is provided. The parts 6b and 6b are joined with the common joining plate 13 and the bolt 7 and assembled to the cross-shaped cross-section member 21 for stiffening buckling.

Hereinafter, the present invention will be described based on illustrated embodiments.
FIG. 1 shows a part of a truss beam 1 used to construct a large span roof. As shown in FIG. 2, the diagonal member and the chord member of the truss beam 1 are two angle-shaped steel assembly members 20 in which two angle-shaped steels 3 and 3 are combined back to back with a spelling material 4 interposed therebetween and assembled into a T-shaped cross section. It is configured as. Incidentally, the angle steel assembly member 20 is composed of a T-shaped leg portion 20a of a vertical portion and a T-shaped head portion 20b of a horizontal portion. In the present embodiment, the existing angle steel assembly member 20 is buckled and stiffened using a buckling stiffening member made of a grooved steel 5 and a grooved steel 6 with a lip, which are existing lightweight steels.

  Specifically, as shown in FIG. 2, of the two large and small buckling stiffening members 5 and 6 having a substantially U-shaped cross section with respect to two perpendicular sides of the angle steel assembly member 20, The grooved steel 6 with the lip has its web 6 a disposed at a right angle on the T-shaped leg portion 20 a of the angle steel assembly member 20, and the groove steel 5 has the web 5 a with the T-shaped head 20 b of the angle steel assembly member 20. Are arranged in parallel to each other so as to be surrounded by a circumscribed state. The bolts 7 are passed through the common bolt holes provided in the flange portions 5b and 6b of the buckling stiffening members 5 and 6 that overlap in advance with the inside and outside, and the inner surface of the flange portion 6b of the lip-shaped grooved steel 6 is previously passed. The flanges 5b and 6b are fastened and joined to each other by bolts 7 and joined to the angle steel assembling member 20 to be buckled and stiffened. It should be noted that machining the bolt hole through which the bolt 7 is passed and welding the nut 8 into which the bolt 5 is screwed are performed in advance in a factory or the like in order to smoothly perform the work on site.

  Incidentally, the T-shaped cross-section member is not limited to the angle steel assembly member 20 in which the two angle steels 3 and 3 are assembled into a combined T-shaped cross section. Although not shown, two large and small buckling stiffening members 5 and 6 having a substantially U-shaped cross section are formed on the diagonal member and the chord member made of the cut T-shaped steel member. It can also be assembled and buckled and stiffened in the same configuration (the inventions of claims 1, 5 and 10).

  Between the flange portions 5b and 6b of the two large and small buckling stiffening members 5 and 6 that overlap on the inside and outside, a gap between the flange portions 5b and 6b is filled and an appropriate interval (for example, about 1 mm to 2 mm). A gap adjusting material 10 is provided to ensure the above. Also in the case of providing the gap adjusting material 10, in consideration of workability at the site, it is welded and joined to the outer surface of the flange portion 6b of the grooved steel 6 with a lip in advance at a factory or the like. Incidentally, the gap adjusting member 10 may be implemented with a configuration provided over the entire length of the buckling stiffening members 5, 6, or may be implemented with a configuration provided partially only at the bolt joint 7. Good (invention of claim 2).

  Further, between the web 5a of the grooved steel 5 and the horizontal portion 20b of the angle steel assembly member 20, a plate-shaped buckling that fills the gap between the two and ensures an appropriate distance (for example, about 1 mm to 2 mm). A stiffening member 11 is provided. This buckling stiffening member 11 may also be implemented with a configuration provided over the entire length of the channel steel 5 and the channel steel 6 with a lip, or may be implemented with a configuration provided only at a partial location. Good (invention of claim 3).

  Further, in order to prevent the angled steel assembly member 20 from shaking, the angle-shaped positioning member 9 is arranged such that the T-shaped leg portion 20a of the angled steel assembly member 20 is sandwiched between the inner surfaces of the webs 6a of the grooved steel 6 with lips. , 9 are provided at intervals of, for example, about 1 mm to 2 mm from the T-shaped leg portion 20 a of the angle steel assembly member 20. This positioning member 9 may also be implemented with a configuration provided over the entire length of the channel steel 5 and the channel steel 6 with a lip, or may be implemented with a configuration provided only at a partial location ( Invention of Claim 4).

  Therefore, the buckling stiffening structure of the first embodiment has a grooved steel 5 and a grooved steel with a lip previously processed in a factory or the like into an existing angled steel assembly member 20 assembled in a T-shaped section with angled steels 3 and 3. It is a simple structure that is combined with the arrangement that surrounds 6 in the circumscribed state and is simply joined with the bolt 7 and assembled to the angle steel assembly member 20, and does not require any troublesome work such as welding at the site, so it is easy to install・ Excellent safety and can be easily and quickly buckled and stiffened. In addition, a plate-shaped buckling stiffening member 11 or a gap adjusting member 10 for positioning a hole for passing a bolt 7 in a grooved steel 5 or a grooved steel 6 with a lip, or a grooved steel 6 with a lip, or a positioning, and positioning. It can be carried out with simple processing to the extent that the member 9 is installed, and yet the lightweight steel is light and strong, so it can be constructed with simple scaffolds and work vehicles, and it is excellent in workability and greatly contributes to cost reduction. be able to.

  Means for fixing the buckling stiffening members 5, 6 to the angle steel assembly member 20 so that the buckling stiffening members 5, 6 assembled to the angle steel assembly member 20 do not slide (slid down). For example, as shown in FIGS. 3 and 4, the lower ends of the buckling stiffening members 5 and 6 are securely fastened by the fixture 12 attached to the horizontal portion 20 b of the angle steel assembly member 20. Since this fastening means does not require any contact with other members such as pillars, it is not necessary to replace or reinforce a joint such as a gusset plate, and is excellent in workability.

  The diagonal member 21 of the truss beam 1 according to the embodiment shown in FIG. 5 is configured as a chevron steel assembly member 21 in which four chevron steels 3... Yes. In this embodiment, the existing angle steel assembly member 21 is buckled and stiffened by using buckling stiffening members made of lip-shaped grooved steels 6 and 6, which are existing lightweight steels.

  Specifically, as shown in FIG. 5, two of the approximately the same size having a substantially U-shaped cross section with respect to two symmetrically arranged sides of four intersecting orthogonal sides of the angle steel assembly member 21. The webs 6a of the lip-shaped channel steels 6 and 6 are arranged at right angles to the top and bottom of the T-shaped leg portion 21a of the angle steel assembly member 21, and are combined in an arrangement so as to surround each circumscribed state. And the common joining plate 13 is installed in the flange part 6b of the grooved steel 6 and 6 with a lip | rip combined, and the flange part 6b and the joining plate 13 of the grooved steel 6 and 6 with a lip were previously provided. Bolts 7 are passed through the common bolt holes, and nuts 8 which are spot-welded or the like are screwed into the inner surface of the flange portion 6b of the lip groove steel 6 in advance so as to coincide with the bolt holes. The flange portions 6a and 6a are firmly fastened and joined with a common joining plate 13 and bolt 7 to be attached to the angle steel assembly member 21 and are buckled and stiffened. Processing the bolt hole through which the bolt 7 is passed and welding joining of the nut 8 into which the bolt 5 is screwed are processed in advance in a factory or the like in order to smoothly perform work on site (Claims 6 and 9 and 10).

  Further, between the flanges 6b and 6b of the lip-shaped grooved steels 6 and 6 and the common joining plate 13, a gap adjustment is performed to fill the gap between the two and ensure an appropriate distance (for example, about 1 mm to 2 mm). A material 10 is provided. Even when this gap adjusting material 10 is installed, it is welded and joined to the outer surface of the flange portion 6b of the grooved steel 6 with a lip in advance at a factory or the like in consideration of workability at the site. In addition, the said clearance gap adjustment material 10 may be implemented by the structure provided over the full length of the buckling stiffening members 6 and 6, and may be implemented by the structure provided partially only in the bolt joining location. (Invention of Claim 7).

  Further, in order to prevent the chevron of the angle steel assembly member 21, the inner surface of the web 6 a of the grooved steel 6 with the lip is disposed in an angle shape so as to sandwich the opposing portion of the angle steel assembly member 21 having a T-shaped cross section. The positioning members 9 and 9 are provided at intervals of, for example, about 1 mm to 2 mm from the T-shaped leg portion 21 a of the angle steel assembly member 21. This positioning member 9 may also be implemented with a configuration provided over the entire length of the lip-shaped channel steel 6, or may be implemented with a configuration provided only at a partial location (claim 8). invention).

  In the buckling stiffening structure of the second embodiment, two buckled stiffening stiffening members 6 and 6 that have been processed in advance in a factory or the like are added to the existing angle steel assembly member 21 that has been assembled in a cross-shaped cross section with angle steel. Since it is a simple structure that is simply combined with the bolt 7 and assembled with the angle steel surrounding member 21 in a circumscribed state, it does not require any troublesome work such as welding at the site.・ Excellent safety and can be easily and quickly buckled and stiffened.

  The embodiments have been described with reference to the drawings. However, the present invention is not limited to the illustrated embodiments, and design modifications and application variations that are usually made by those skilled in the art are within the scope of the technical idea of the invention. I will add a note to include the range.

It is an elevation view which shows a part of truss beam. It is sectional drawing which shows the buckling stiffening structure of a T-shaped cross-section member. It is the elements on larger scale which show the means to fasten a buckling stiffening member to a T-shaped section member. FIG. 4 is a cross-sectional view taken along line II in FIG. 3. It is sectional drawing which shows the buckling stiffening structure of a cross-shaped cross-section member.

Explanation of symbols

20 T-shaped cross-section member (mountain steel assembly member)
21 Cross-shaped cross-section member (mountain steel assembly member)
3 Angle steel 5 Channel steel (buckling stiffening member)
6 Channel steel with lip (buckling stiffening member)
5a, 6a Web of buckling stiffening member 5b, 6b Flange portion of buckling stiffening member 7 Bolt 9 Positioning member 10 Clearance adjusting material 11 Plate-shaped buckling stiffening member 13 Bonding plate

Claims (10)

  Of the two large and small buckling stiffening members whose transverse cross-section is substantially U-shaped with respect to two perpendicular sides of the T-shaped cross-section member, one stiffener has its web against the T-shaped leg portion. The flanges of the buckling stiffening members overlapped inside and outside are combined with each other so that the other stiffener is placed in parallel with the T-shaped head and the web is parallel to the T-shaped head. Is a buckling stiffening structure of a T-shaped cross-section member for a truss, characterized in that it is joined to a T-shaped cross-section member by bolting and is buckled and stiffened.   The gap adjusting material is provided between the flange portions of the two large and small buckling stiffening members overlapped inside and outside, and the flange portions are joined to each other by bolts. Buckling stiffening structure of T-shaped cross-section member for truss.   A plate-shaped buckling stiffening member that fills the gap between the inner surface of the web of the buckling stiffening member having a substantially U-shaped cross section and the T-shaped cross-section member is provided. The buckling stiffening structure for the T-shaped cross-section member for truss according to claim 1 or 2.   An angled positioning member is provided on the inner surface of the web of the buckling stiffening member having a substantially U-shaped cross section, with the T-shaped leg portion of the T-shaped cross-sectional member being sandwiched therebetween, The buckling stiffening structure of the T-shaped cross-sectional member for truss as described in any one of Claims 1-3.   The T-shaped cross-section member is a chevron steel assembly member obtained by combining two angle steels back to back and assembled into a T-shaped cross section, or a cut T-shaped steel member. The buckling stiffening structure of the T-shaped cross-section member for truss described in 1.   The web of two buckling stiffening members of approximately the same size whose transverse cross-section is substantially U-shaped with respect to two symmetrically-arranged sides of the four intersecting orthogonal sides of the cross-shaped cross-section member are arranged at right angles. In combination with the arrangement surrounding the state, a common joining plate is installed on the flange portion of the buckling stiffening member, and the flange portions of each buckling stiffening member are joined with a common joining plate and bolts. A buckling and stiffening structure for a cross-shaped cross-sectional member for a truss, wherein the buckling and stiffening is assembled to a letter-shaped cross-sectional member.   There is a gap adjusting material between the flange portions of two substantially equal buckling stiffening members combined in an arrangement surrounding the cross-shaped cross-section member in a circumscribed state and a common joining plate installed on the flange portion. The buckling stiffening structure for a cross-shaped cross-sectional member for a truss according to claim 6, wherein the flange portions of each buckling stiffening member are joined to each other by a common joining plate and a bolt. .   The angle-shaped positioning member is provided on the inner surface of the web of the buckling stiffening member having a substantially U-shaped cross-section so as to sandwich the opposing portion of the cross-shaped cross-section member. A buckling stiffening structure for a cross-shaped cross member for a truss as described in 6 or 7.   The cross-shaped cross section for a truss according to any one of claims 6 to 8, wherein the cross-shaped cross-section member is an angle-shaped steel assembly member in which four angle steels are combined back to back and assembled into a cross-shaped cross section. Buckling stiffening structure for members. The grooved steel that is a lightweight steel or the grooved steel with a lip is used as a buckling stiffening member to be assembled to the T-shaped cross-section member or the cross-shaped cross-section member. The buckling stiffening structure of the T-shaped cross-section member for truss or the cross-shaped cross-section member described in any one.

Images