JPH04128460A - Reinforcing structural member - Google Patents

Abstract

PURPOSE:To obtain a structural member whose torsional rigidity is high by projecting a plurality of anchoring members on the side face of a structural member main body at regular intervals in the longitudinal direction of the member, and connecting the anchoring members together by means of bar-shaped members disposed diagonally or horizontally. CONSTITUTION:Longitudinal stiffeners 4 are provided at predetermined intervals between the upper and lower flanges 3a, 3b of a beam 1 of I-shaped cross section made by an H-steel. Adjacent longitudinal stiffeners 4 are used as anchoring members and connected together by steel bars 5 which cross each other in the form X. Thereby the rigidity of a structural member is increased so as to restrain deformation of the member.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a supplementary structure for structural members such as beams or columns used in architecture, civil engineering structures, etc., and is mainly used for large span beams and rigid frame frames. Used as beams, columns, etc.

[Conventional technology and issues]

For example, as an adjunct structure for a ■-shaped cross-section porcelain using shaped steel,
Stiffeners welded between the upper and lower flanges and horizontal auxiliary ribs welded to the web are common, and these auxiliary members increase the rigidity of the rice cake and prevent plate buckling.

However, for example, in structures with large spans, supplementary rules such as stiffeners may not be sufficient, and it becomes difficult to design against lateral buckling and twisting.

The present invention aims to solve the above-mentioned problems.

[Means to solve the problem]

The present invention involves protruding a plurality of fixing members at intervals in the longitudinal direction from the side surface of a structure main body that constitutes a beam or column of a structure, and connecting the fixing members with diagonally or horizontally arranged rod-shaped members. By doing so, the pillars or scallops, which are structural members, are supplemented.

By supplementing in this way, it is effective against lateral buckling,
In addition, a structural member with high torsional rigidity can be obtained.

More specifically, for example, in the case of an I-shaped cross-section beam made of section steel, a plurality of vertical stiffeners are provided at predetermined intervals, and the vertical stiffeners are used as fixing members, and the steel is connected as a rod-shaped member between adjacent vertical stiffeners. They can be connected using diagonal members such as rods. In this case, the -1-F flange of the section steel is used as the upper and lower chord members, and the vertical stiffener and steel rod form a truss parallel to the web surface, increasing the member rigidity against the bending that the beam is originally subjected to.
Deformation can be reduced. Moreover, - the upper and lower flanges and the left and right side trusses form a box-shaped cross section, increasing torsional rigidity and making it possible to design a large span beam that is effective against lateral buckling.

The steel rod that connects the vertical stiffeners is not only used as the #1 member of the truss, but may also be arranged parallel to the flange surface for part or all of the longitudinal direction of the beam.

In addition, only the vertical stiffeners can be connected with steel rods at the ends of the frame, which suppresses the elastic deformation to a small level when bending the ends during an earthquake. ) can be raised.

In the case of an r-shaped cross-section beam for the structural part of the shrine body, boat fishing ■1
In addition to shaped steel, honeycomb beams, lattice beams, truss beams, etc. may be used, and the members constituting the flange may be angle assembled, cut l-'r, steel pipes, etc. Moreover, a member having a cross section such as a channel or a rectangle may be used as the structural member main body, and the material is not limited to steel such as section steel, but may also be light metal, wood, etc.

In addition to the above-mentioned vertical stiffener, the fixing member may be a rib provided at the corner of the flange and the web. Further, when the structural member main body is made of wood with a rectangular cross section, a metal fitting or the like that is attached to the top of the wooden beam 1/' and has rib-like projecting portions on the left and right sides can also be used as the fixing member.

The rod-shaped member that connects the fixing members is not limited to a steel rod, but may also be a shaped steel such as an angle, various types of PC steel, or the like.

〔Example〕

The illustrated embodiment will be described below.

FIG. 1 shows an embodiment in which the present invention is applied to an I-shaped cross-section.

In this embodiment, vertical stiffeners 4 are provided at predetermined intervals between the lower flanges 3a and 3b of the ■-shaped cross-sectional beam 1 made of H-shaped steel, and the adjacent vertical stiffeners 4 intersect in an X shape when viewed from the side. They are connected by steel rods 5.

The end of the steel rod 5 may be fixed, for example, by passing through a vertical stiffener 4 and being fixed with a bolt and nut, thereby introducing tension depending on the design.

The supplementary portion formed by the vertical stiffener 4 and the steel rod 5 constitutes a truss parallel to the web 2, with the upper and lower flanges 3a and 3b of the main body of the beam 1 being regarded as upper and lower crescent moons.

In the case of this example, the upper and lower flanges 3a and 3b of the rope 1 and the trusses on both sides of the web 2 form a box-shaped cross section, which greatly increases the torsional rigidity, making it possible to design a beam with a large span that is effective against lateral buckling. . Note that the steel rod 5 is
It is also possible to use only diagonal members in the ■ direction without using a mold.

Also, even if only one side of the web 2 is made into a truss shape,
A box-shaped cross section is formed with the web 2 of the rice cake 1, and a certain effect can be expected.

FIG. 2 shows another embodiment of the present invention, in which a through hole 6 is provided in the center of a web 2 partitioned by vertical stiffeners 4 of an I-shaped cross-section beam 1, and vertical stiffeners 4 on both sides of the web 2 are provided. are connected by crossing steel rods 5 in an X shape to form a three-dimensional truss. In this case as well, it is possible to design a large span girder that has high torsional rigidity and is effective against lateral buckling. In particular, the effect can be enhanced by expanding and protruding the vertical stiffeners 4 laterally as shown in the figure.

In the embodiments shown in FIGS. 1 and 2, if the steel rod 5 is tensioned to some extent as a whole, it is advantageous to ensure rigidity by 1'1. In order to make the steel rod 5 effective against the compressive force of 1 lath, it is necessary to tighten it to the design stress level.

FIG. 3 shows an embodiment in which the structure of the present invention is applied only to one end of the beam of the frame. A pair of vertical stiffeners 4 are provided at the end of the beam 1, and the two vertical stiffeners 4 are connected in an X-shape with a steel rod 5. Furthermore, a parallel steel rod 5a is arranged below, and these are tightened. ]Gedeiru. In this case, the elastic deformation due to the bending of the shed edge during an earthquake can be suppressed to a small level, and the above-mentioned plastic modulus can be increased. Further, one end of the upper and lower parallel steel rods 5a may be fixed to the flange 9 of the column 7 constituting the frame instead of the vertical stiffener 4.

In the embodiment shown in FIG. 4, flat steel bars 5b are stretched on both sides of a large span beam 1 to prevent horizontal buckling of the beam j. Stick out the stiffener 4 on both sides of the beam 1,
Tensioning is effective in preventing lateral buckling.

The embodiment shown in FIG. 5 is designed to prevent lateral buckling of the I-shaped cross-section beam 1.
A steel rod 5c is stretched near the flange 3a on the bending compression side. In this case, as the fixing member, a rib-shaped simple fixing fitting 4a may be used instead of the vertical stiffener 4 of each of the above embodiments. The steel rod 5c may be stretched parallel to the flange 3a, or the width may be expanded at the end of the rice bran 1 as shown in the figure. In this example, an overhanging fixing section 10 is formed at the flange 9 portion of the column 7 of the column-beam frame, and the end of the steel rod 5c is fixed to this fixing section 10.

In the embodiments shown in FIGS. 4 and 5 above, the steel bars 5b, 5
c may be provided for each section separated by the adjacent stiffeners 4 or metal fittings 4a, or may be provided across multiple sections.When tensioning the steel bars 5b and 5c, the reaction force will be applied to the beam. 1, but as shown in the figure, it may be poured into the columns 7 on both sides of the beam 1, or the steel rods 5b and 5c may be poured into the columns 7 on both sides of the beam 1.
If it is fastened so as to straddle the threads 1 on both sides, it will be more advantageous to prevent lateral buckling.

Another possible arrangement of the steel rods 5 is to arrange and tighten them so that the stress and deformation are opposite to those under which the designed force is applied. In this case, a truss is constructed on two sides of the web by vertical stiffeners 4 and diagonal members (steel rods 5) in the direction according to the stress, and a lower flange 31 is installed at the middle part of the rope 1.
Possible options include placing steel bars etc. in parallel to each other and raising them diagonally near both ends of beam 1, and placing all steel bars 5 parallel to flanges 3a and 3b of beam J, with the sides curved in the opposite direction from when they were installed. It will be done.

In the embodiment shown in FIGS. 6 and 7, metal fittings 11 for fixing steel rods are placed at predetermined intervals above and below a wooden beam 1a having a rectangular cross section, and the fittings 11 for fixing the steel rods are placed between the rib-shaped fixing portions 4b without protruding from the left and right. are connected in an X-shape with steel rods 5, and truss surfaces are formed on both sides of the beam 1a.

〔Effect of the invention〕

(2) By forming a truss on both sides or one side of the structural member main body using a fixing member and a rod-shaped member for supporting the structural member main body, the member rigidity of the structural member can be increased by 1-1, and deformation can be suppressed.

(2) Since the structural member main body and the supplementary surface formed by the fixing member and the rod-shaped member have a box-shaped cross section, torsional rigidity is increased, and a large span wire can be designed that is effective against lateral buckling.

■ The plasticity modulus can be increased by increasing the rigidity of the member and reducing the elastic deformation. In particular, by canceling the design stress near the joints of columns and beams, it is possible to delay the initial plasticization at the ends of the members during an earthquake.

■ By applying a reverse moment by tightening the steel bars, deformation after erection can be suppressed, and in structures with large spans, the beam structure can be lowered, making it more advantageous for structural planning.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing one embodiment of the present invention applied to an I-shaped cross section, Fig. 2 is a perspective view showing another embodiment, and Fig. 3 is a perspective view showing another embodiment.
The figure is a front view showing an embodiment in which the structure of the present invention is applied only to the end portion of the frame, FIGS. 4 and 5 are perspective views showing still other embodiments, and FIGS. 6 and 7 These are a front view and a cross-sectional view perpendicular to the beam axis direction, showing an embodiment in which the present invention is applied to a wooden tile having a rectangular cross section. DESCRIPTION OF SYMBOLS 1... Beam, 2... Web, 3a, 3b... Flange, 4... Diffener, 5... Net rod, 6... Through hole, 7 Column, 9... Flange, 10 ...Fusing part, 11
... Steel bar fixing fittings

Claims (5)

[Claims] (1) A plurality of fixing members are protruded from the side surface of a structural member main body constituting a beam or column of a structure at intervals in the longitudinal direction of the structural member main body, and the fixing members are arranged diagonally or horizontally. A stiffening structural member characterized by being connected by rod-shaped members. (2) The structural member main body has a through hole in a direction perpendicular to the longitudinal direction of the structural member main body, and a part or all of the rod-shaped member passes through the through hole and faces oppositely with the structural member main body sandwiched therebetween. Claim 1, wherein the fixing members at different positions are connected to each other.
The stiffening structural member described. (3) The stiffening structural member according to claim 1 or 2, wherein the rod-shaped member is provided only in sections at both ends of the structural member main body. (4) A plurality of stiffeners are provided between the upper and lower flanges of an I-shaped cross-sectional member that constitutes a column or beam of a structure, perpendicular to the axial direction of the I-shaped cross-sectional member, and rod-shaped connecting members are used to connect the stiffeners in a truss-like manner. A stiffening structural member characterized by being connected to. (5) The stiffening structural member according to claim 1, wherein a tension force is introduced into the rod-shaped member.