JP2005320745A - Beam stiffening unit and beam stiffening structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a beam stiffening unit and a beam stiffening structure, which can adapt even to a change in design and the extension and alteration of a building by enhancing structural resistance of a beam-column joint, in a steel frame which makes a column and a beam rigidly joined together in such a manner that the beam predominates over the column. <P>SOLUTION: In the beam stiffening unit 1, a unit body 10 is groovily formed of upper and lower horizontal stiffening plates 121 which are joined to the insides of upper and lower flanges of the beam, respectively, and a vertical stiffening plate 122 which connects the plates 121 together so as to make them abut on a side surface of a web of the beam. In the inside of the unit body 10, two ribs 14 are erected in positions corresponding to the widths of the respective columns which are provided at least in the upper and lower positions of the beam. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a beam stiffening unit and a beam stiffening structure in a steel frame in which a column and a beam are rigidly joined to each other.

  In buildings such as steel-framed houses that use steel frames for the main structural parts, stiffeners on both sides of the web are used to prevent web crushing and buckling in areas where concentrated loads of beams made of H-shaped steel or I-shaped steel act. In general, the web is divided into small panels to increase the buckling strength of the web.

For example, in Patent Document 1, a pair of stiffeners are joined by fillet welding between the upper and lower flanges of the beam at the portion where the steel beam and the stud are joined, and these stiffeners and the upper and lower flanges of the beam. In the web portion (panel zone) surrounded by, a structure of a large beam in which a panel made of extremely mild steel is incorporated is disclosed. Patent Document 2 discloses a column beam joint structure in which a beam is reinforced by fixing a reinforcing bracket having a substantially U-shaped cross section between an upper flange and a lower flange of a beam.
JP-A-10-184070 JP-A-8-120784

  However, as in Patent Document 1, in order to join the stiffener to the beam, processes such as steel processing and welding, as well as steps such as beam distortion removal and flaw detection inspection are required. The number of man-hours in the process will increase, which will also increase costs. In addition, since beams with such a structure are manufactured at the factory with the stiffener integrated with the beams, it is not possible to respond to design changes such as adding columns or changing column positions, and expansion / reconstruction after construction. There is also.

  In addition, the joint structure described in Patent Document 2 can be implemented only when the column is joined to the outer surface of the flange of the beam by welding, and in the joint where the column and the beam are fastened by bolts / nuts or the like. Not applicable.

  Therefore, the present invention has been made in view of the above-described problems. In a steel frame in which a column and a beam are rigidly connected to each other, the structural strength of the column connection part of the beam is increased and the number of parts is increased. Therefore, the present invention provides a beam stiffening unit and a beam stiffening structure that are simple in structure, have excellent productivity and workability, and can be adapted to design changes and expansions and modifications.

  In order to achieve the above-described object, the present invention provides a beam stiffening unit provided in a column joint portion of a beam having a vertical flange and a web in a steel frame in which a column and a beam are rigidly joined to each other. The main body is formed into a groove shape by upper and lower horizontal stiffening plates that are joined to the inside of the upper and lower flanges of the beam, and a vertical stiffening plate that can be brought into contact with the web side surface of the beam by connecting these horizontal stiffening plates. On the inside of the unit body, at least two ribs are erected at positions corresponding to the widths of the columns joined to the upper and lower sides of the beam, and the unit body is connected to the upper flange and the lower flange of the beam. In addition, the upper and lower horizontal stiffening plates are respectively joined to the upper and lower flanges of the beam to reinforce the column joint portion of the beam.

  According to this configuration, the upper and lower horizontal stiffening plates reinforce the upper and lower flanges of the beam, and the vertical stiffening plates that connect these horizontal stiffening plates and the ribs inside the unit body reinforce the beam web. Therefore, the rigidity of the beam at the column joint can be increased. In addition, since the beam stiffening unit can stiffen the beam simply by fitting between the upper and lower flanges of the beam and joining them at the construction site, it can cope with design changes and extension / renovation.

  Further, in the beam stiffening structure of the present invention, the upper and lower horizontal stiffening plates joined by the vertical stiffening plates that can abut against the web side surface of the beam are joined to the inside of the upper and lower flanges of the beam, respectively. Between the upper and lower horizontal stiffening plates, at least two ribs are erected at positions corresponding to the width of the columns to be joined to the upper and lower sides of the beam, respectively, and the column joints of the beam are reinforced. To do. Thereby, it is possible to prevent local buckling at the column joint portion of the beam with a simple structure, and it is possible to improve load resistance against external force.

  According to the beam stiffening unit of the present invention configured as described above, the unit main body with the ribs on the inside is fitted and joined between the upper and lower flanges of the beam, thereby increasing the number of steps in the beam manufacturing process. Without stiffening, the column joint of the beam can be easily stiffened. In addition, these beam stiffening units can be attached not only to the beam in advance at the factory, but also to be retrofitted to the beam. Can also be easily accommodated.

  Further, according to the beam stiffening structure of the present invention, the upper and lower horizontal stiffening plates reinforce the upper and lower flanges of the beam, respectively, and the vertical stiffening plate connecting these horizontal stiffening plates and the inner side of the unit main body. Since the rib is configured to reinforce the web of the beam, the structural yield strength at the column beam joint can be improved.

  Hereinafter, the best mode for carrying out a beam stiffening unit according to the present invention will be described with reference to the drawings. 1 is a perspective view showing an embodiment of a beam stiffening unit according to the present invention, FIG. 2 is a side view showing a beam stiffening structure using the beam stiffening unit of FIG. 1, and FIG. 3 is an axial sectional view of the beam in FIG. It is.

  This beam stiffening unit 1 is provided at the joint portion of the beam 2 made of H-shaped steel with the column 3 in a steel frame in which the column 3 and the beam 2 are rigidly joined to each other. As shown in FIG. 1, the unit body 10 is formed in a groove shape by upper and lower horizontal stiffening plates 121 and a vertical stiffening plate 122 that couples these horizontal stiffening plates 121. Two ribs 14 are erected on the inside of the unit body 10. Further, the upper and lower horizontal stiffening plates 121 are respectively provided with bolt holes 16 on both sides of the rib 14.

  In such a beam stiffening unit 1, as shown in FIG. 2, the upper and lower horizontal stiffening plates 121 are joined to the inside of the upper and lower flanges 22 a and 22 b of the beam 2, and the vertical stiffening plate 122 is connected to the web of the beam 2. It can come into contact with the side surface of the.

  The ribs 14 of the beam stiffening unit 1 are provided at least at positions corresponding to the column widths of the columns 3 joined to the top and bottom of the beam 2. In other words, as illustrated, the two ribs 14 are arranged at intervals corresponding to the width of the flange 31 of the column 3 having an H-shaped cross section, and are provided in the unit body 10 so as to be continuous with the flange 31 of the column 3. It is preferable.

  And the beam stiffening unit 1 formed in this way is fitted between the upper flange 22a and the lower flange 22b of the beam 2, and through the bolt holes 16 formed in the upper and lower horizontal stiffening plates 121, The upper and lower flanges 22a and 22b of the beam 2 are fastened with bolts and nuts.

  At the end of the column 3 joined to the top and bottom of the beam 2, an end plate 32 is provided to be attached to the flanges 22a and 22b. At the same time as joining the horizontal stiffening plate 121 of the unit body 10 to the flanges 22a and 22b, The end plate 32 can also be fastened to the flanges 22a and 22b with bolts. Thereby, the operation | work which equips the beam 2 with the beam stiffening unit 1 and the operation | work which joins the pillar 3 to the beam 2 can be performed together, and it becomes possible to rationalize a construction process.

  With this configuration, the beam stiffening unit 1 includes a vertical stiffening plate in which the upper and lower horizontal stiffening plates 121 reinforce the upper and lower flanges 22 a and 22 b of the beam 2 and connect the horizontal stiffening plates 121. 122 and ribs 14 erected between the upper and lower horizontal stiffening plates 121 reinforce the web 21 of the beam 2. Further, as shown in FIG. 3, a stiffening structure in which a beam stiffening unit 1 is similarly provided on the opposite side of the side of the web 21 of the beam 2 to reinforce the joint with the column 3 and to increase the rigidity of the beam 2. Is formed. Such a stiffening structure prevents local buckling at the column joint portion of the beam 2 and can improve the load resistance against external force.

  Further, the stiffening structure of the beam stiffening unit 1 and the beam 2 according to the present invention is, for example, as shown in FIG. 4, when the column 3 is provided close to the beam 2, the length spans the upper and lower columns 3. Thus, the unit body 10 may be formed and the ribs 14 may be disposed at the positions of the flanges 31 of the columns 3. By forming the beam stiffening unit 1 in this way, the beam 2 to which the plurality of columns 3 are joined can be simultaneously reinforced with one beam stiffening unit 1, and the columns can be easily processed without many steps. A stiffening structure of the joint can be formed.

  In addition, according to the stiffening structure of the beam stiffening unit 1 and the beam 2 of the present invention, as shown in FIG. The beam stiffening unit 1 having a sufficient length is disposed on the beam 2 so as to extend over the mounting position 3, and the structural strength of the beam can be increased while taking advantage of the steel frame type that has won the beam. .

  The beam stiffening unit 1 according to the present invention is not limited to the above two examples. For example, the unit body 10 is provided with two ribs 14 according to the flange width of the column 3, and between these ribs 14. Another rib 14 may be provided to increase the proof stress.

  Further, the beam stiffening unit 1 and the upper and lower flanges 22a and 22b of the beam 2 may be joined by bolt / nut fastening or by welding. Moreover, although what consists of H-section steel was illustrated as the beam 2 and the pillar 3, these may be type steel materials, such as I-section steel and a channel-shaped steel, respectively.

  INDUSTRIAL APPLICABILITY The present invention can be effectively used to increase the supplementary rigidity of a column beam joint in a building such as a steel framed house that uses a steel frame as a main structure.

It is a perspective view of a beam stiffening unit according to the present invention. It is a side view which shows the stiffening structure of the beam of this invention. It is an axial sectional view showing a stiffening structure of a beam according to the present invention. It is a side view which shows the stiffening structure of the beam of this invention. It is a side view which shows the stiffening structure of the beam of this invention.

Explanation of symbols

Beam stiffening unit 1
Unit body 10
Horizontal stiffening plate 121
Vertical stiffening plate 122
Rib 14
Bolt hole 16
Beam 2
Web 21
Upper flange 22a
Lower flange 22b
Pillar 3
Flange 31
End plate 32

Claims (2)

In a steel frame in which a column and a beam are rigidly joined to win the beam, a beam stiffening unit provided in a column joint of a beam having an upper and lower flange and a web,
The unit body is formed into a groove shape by upper and lower horizontal stiffening plates that are joined to the inside of the upper and lower flanges of the beam, and a vertical stiffening plate that can join these horizontal stiffening plates and abut against the web side of the beam Formed, and at least two ribs are erected on the inside of the unit body at positions corresponding to the widths of the columns joined to the upper and lower sides of the beam,
The unit body is fitted between the upper flange and the lower flange of the beam, and the upper and lower horizontal stiffening plates are respectively joined to the upper and lower flanges of the beam to reinforce the column joint portion of the beam. Beam stiffening unit. In a steel frame in which a column and a beam are rigidly joined to win the beam, a beam stiffening structure having an upper and lower flange and a web,
Upper and lower horizontal stiffening plates joined by vertical stiffening plates that can abut against the web side of the beam are joined to the inside of the upper and lower flanges of the beam, respectively. A beam stiffening structure characterized in that at least two ribs are erected at positions corresponding to the widths of the columns to be joined to each other to reinforce the column joint portion of the beam.

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