JP2016223263A - Grooved lightweight section steel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a grooved lightweight section steel that improves flexural rigidity and buckling yield strength of a structural member formed by making a pair of grooved lightweight section steels into a back-to-back state, and can achieve rational and economical design based on the magnitude of stress generated.SOLUTION: A grooved lightweight section steel 1 applying the present invention extends in a depth direction at a predetermined cross-sectional shape, and includes: a pair of flanges 2 extending to a width direction X; a web 3 extending in a height direction Y at the side of one side edge 2a of the width direction X of the pair of flanges 2; and an erection part 4 erected from the web 3 to the flange 2. In the web 3, any one or both ends of the height direction Y are disposed at intervals S from the flange 2 proximal to the end of the web 3 to the height direction Y. The erection part 4 extends at a slant so as to be separated from one side edge 2a of the width direction X of the flange 2 from the end of the web 3 to the flange 2, and is joined to the flange 2 by welding.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a grooved lightweight steel having a predetermined cross-sectional shape and extending in the depth direction.

  Conventionally, a room box disclosed in Patent Document 1 has been proposed as providing a building in which a ceiling, a floor, and a wall are integrally combined in advance. In addition, by changing the wall thickness of the web and flange, the lightweight section steel disclosed in Patent Documents 2 to 4 is provided as a lightweight section steel having a light weight while maintaining the cross-sectional performance and the outer diameter. Has been proposed.

  In the room box disclosed in Patent Document 1, a ceiling frame is formed by joining a plurality of C-shaped cross-section steel bars in a rectangular frame shape, and bolts projecting downward from the joining plate on the outer surface of the ceiling frame are provided. The horizontal piece is placed on the upper chord member so as to be inserted into the upper chord member of the shaft frame, and the nut is tightened from the lower side.

  The lightweight section steel disclosed in Patent Document 2 has a U-shaped, L-shaped, or Z-shaped cross section formed by bending a steel strip in the width direction, and the width direction both ends of the steel strip or the section steel are widened. By pressing toward the center in the direction, the part of the flange of the section steel or the region corresponding to the entire area is thickened to a thickness greater than the thickness of the material steel strip, so that part or all of the flange is thicker than the web. It has become.

  The double flange lightweight steel disclosed in Patent Document 3 is formed by bending the width direction of a long steel plate into a substantially U-shaped cross-sectional shape, and bending the steel plate by bending 180 degrees from the front end of the flange having the substantially U-shaped cross-sectional shape. The double flange and the central part of the web are formed of a single plate.

  In the multilayer lightweight H-section steel disclosed in Patent Document 4, the width direction of the long steel plate is bent into a substantially H-shaped cross section, and the steel plate is bent by 180 degrees from the front end of the flange having the substantially H-shaped cross section. The overlapped flange and the central portion of the outer web are formed of a single plate.

JP 2001-055806 A JP 2003-147900 A JP 2011-106149 A JP 2011-162992 A

  However, since the room box disclosed in Patent Document 1 is not provided with an erection part that is erected from the web to the flange in the C-shaped cross section, the flange and the web are integrally formed from a steel plate or the like. As a result, it is necessary to increase the thickness of the web based on the magnitude of the stress generated in the flange, the relative moment of inertia per unit weight is relatively low, and the bending stiffness per unit weight is relative. Become smaller.

  Moreover, since the lightweight shape steel etc. which were disclosed by patent documents 2-4 are not provided with the erection part erected from a web to a flange, especially since the width-thickness ratio of a flange cannot be made small, it is a unit. High buckling strength per weight cannot be ensured. For example, in a structural member such as a beam or a column with a pair of channel steels back to back, the buckling strength per unit weight of the structural member can be improved. It will be impossible.

  Therefore, the present invention has been devised in view of the above-described problems, and its object is to improve the bending rigidity and buckling strength of a structural member made of a pair of grooved lightweight sections back to back. Thus, it is an object of the present invention to provide a grooved lightweight section steel that can realize a rational and economical design according to the magnitude of the generated stress.

  The grooved lightweight steel according to the first invention is a grooved lightweight steel having a predetermined cross-sectional shape and extending in the depth direction, and a pair of flanges extending in the width direction in the cross-sectional direction, and a width direction of the pair of flanges A web extending in the height direction on one side end side, and a erection part constructed from the web to the flange, wherein the web has one or both of the end portions in the height direction. The erected portion is disposed at a distance from the flange adjacent to the flange in the height direction, and the erection portion is arranged at one side end in the width direction of the flange from the end portion of the web to the flange adjacent to the end portion. It extends in a slanting manner so as to be separated from the flange, and is joined to the flange by welding.

  The grooved lightweight steel according to a second aspect of the present invention is characterized in that, in the first aspect, the web is formed with a plate thickness thinner than any one or both of the pair of flanges.

  The grooved lightweight steel according to a third aspect of the present invention is the first aspect or the second aspect of the present invention, wherein the erection part is configured to separate a joint portion to be joined to the flange from one side end in the width direction of the flange. The separation distance Wf satisfies the relationship defined by the following equation (1). Here, B: The width dimension of the flange (B> 20 mm).

[Equation 1]
20 mm ≦ Wf ≦ 1.0 × B (1)

  In the lightweight lightweight steel according to a fourth aspect of the present invention, in any one of the first to third aspects of the present invention, the erection portion is connected to the flange from the one side end in the width direction of the flange. The separated separation distance Wf satisfies the relationship defined by the following equation (2). Here, B: the width of the flange.

[Equation 2]
0.2 × B ≦ Wf ≦ 1.0 × B (2)

  The grooved lightweight steel according to a fifth invention is any one of the first invention to the fourth invention, wherein the erection portion has a width of the flange from the end portion of the web to the flange adjacent to the end portion. It extends substantially linearly or curvedly so as to be separated from one side end in the direction.

  The grooved lightweight steel according to a sixth aspect of the present invention is any one of the first to fifth aspects, wherein the pair of flanges has a width dimension of one of the flanges and a width dimension of the other flange. It is characterized by being larger than.

  In the lightweight lightweight steel according to a seventh aspect of the present invention, in any one of the first to sixth aspects, the pair of flanges are opposed to the other side end in the width direction of the flanges in the height direction. A pair of protruding lip portions is formed.

  According to 1st invention-7th invention, it is high by constructing an erection part from either one or both ends of a web to either one or both of a pair of flanges close to the end of a web. Bending rigidity and buckling strength can be ensured. In particular, a structural member such as a beam or a column can be obtained by bringing a pair of grooved light-weight steels into contact with or apart from each other and making each web back to back. It becomes possible to improve the bending rigidity and buckling strength of the whole.

  In particular, according to the second invention, the cross-sectional secondary moment (bending rigidity) per unit weight of the grooved lightweight section steel is 10 as compared with the conventional grooved lightweight section steel formed in substantially the same sectional shape. Since it can be improved by about 20% to 20%, it is possible to provide a rational and economical groove-shaped lightweight steel according to the magnitude of the generated stress.

  In particular, according to the third aspect of the invention, the separation distance obtained by separating the joining portion of the erection part joined to the flange from one side end in the width direction of the flange satisfies the relationship defined by the above equation (1). By doing so, it becomes possible to ensure the installation space of the electrode when joining by resistance welding.

  In particular, according to the fourth aspect of the invention, the separation distance obtained by separating the joining portion of the erection portion joined to the flange from one side end in the width direction of the flange satisfies the relationship defined by the above expression (2). By doing so, it becomes possible to ensure a high buckling strength.

It is a perspective view which shows structural members, such as a beam or a column, using the groove-shaped lightweight shape steel to which this invention is applied. (A) is sectional drawing which shows the groove-shaped lightweight shape steel to which this invention is applied, (b) is the side view. It is a front view which shows the groove-shaped lightweight shape steel to which this invention is applied. It is a front view which shows the construction part curved with the groove-shaped lightweight shape steel to which this invention is applied. It is a front view which shows the web formed with the plate | board thickness thinner than a flange with the grooved lightweight shape steel to which this invention is applied. It is a front view which shows a pair of flange from which the width dimension mutually differs in the grooved lightweight shape steel to which this invention is applied. (A) is a front view which shows the flange by which the lip | rip part was formed with the grooved lightweight shape steel to which this invention is applied, (b) is a front view which shows the construction part provided only in the upper end part of the web It is. It is a front view which shows what made the separation distance to the junction location of a construction part, and the space | interval to the edge part of a web substantially the same or different by the grooved lightweight shape steel to which this invention is applied. It is a front view which shows the manufacturing process of the grooved light weight shape steel by the steel plate for web bent by the grooved light weight shape steel to which this invention is applied. It is a front view which shows the manufacturing process of the grooved lightweight section steel by the substantially straight-shaped steel plate for webs with the grooved lightweight section steel to which this invention is applied. (A) is a front view which shows the conventional grooved lightweight steel, (b) is a front view which shows the grooved lightweight steel to which this invention is applied, (c) is both ends of a depth direction It is a side view which shows the equal bending load loaded on. It is a graph which shows the relationship between the moment at the time of elastic buckling, and Wf / B in the grooved lightweight steel to which this invention is applied. (A) is a front view which shows the elastic buckling mode of the conventional grooved lightweight section steel, (b) is the grooved lightweight section steel to which this invention is applied, and is Wf / B = 0.5. It is a front view which shows an elastic buckling mode, (c) is a front view which shows the elastic buckling mode in case of Wf / B = 0.7. It is a front view which shows structural members, such as a beam or a column, using the groove-shaped lightweight shape steel to which this invention is applied.

  Hereinafter, an embodiment for carrying out the grooved lightweight section steel 1 to which the present invention is applied will be described in detail with reference to the drawings.

  As shown in FIG. 1, the grooved lightweight steel 1 to which the present invention is applied is used as a structural member 8 such as a beam or a pillar in a building such as a house, a school, an office, or a hospital facility.

  The structural member 8 such as a beam or a column is formed in, for example, a substantially H-shaped cross-section, and at the stage of being manufactured in a factory or the like, at the approximate center of the width direction X of the substantially H-shaped cross-section A position extending in Y is defined as a member core C in the cross-sectional direction, and is divided along the member core C in the depth direction Z.

  The structural member 8 such as a beam or a column is carried into the building site in a state of being divided along the member core C in the depth direction Z. On the other hand, beams and floors, columns and walls, and members such as beams, columns, floors and walls are manufactured by being integrated in a factory or the like and then carried into a building site. At the building site, the structural member 8 such as a beam or a column is assembled along the member core C in the depth direction Z, so that a wall or a floor is formed and a building is constructed.

  Since the structural member 8 such as a beam or a column is assembled by back-to-backing a pair of C-shaped steels and the like divided along the member core C in the depth direction Z at the building site, assembly work at the building site is performed. As an easy thing, it is possible to shorten the construction period at the construction site and simplify the construction management.

  The grooved lightweight steel 1 to which the present invention is applied is formed in a substantially C-shaped cross section. A grooved lightweight section steel 1 to which the present invention is applied is a structural member 8 such as a beam or a column divided along a member core C in a depth direction Z, and is used as each of a pair of C-section steels. And extends in the depth direction Z.

  As shown in FIG. 2, the grooved lightweight steel 1 to which the present invention is applied has a predetermined cross-sectional shape in a cross-sectional direction substantially orthogonal to the depth direction Z. The grooved lightweight steel 1 to which the present invention is applied includes a pair of flanges 2 extending in the width direction X, a web 3 extending in the height direction Y, and an erected portion 4 extending incline in the width direction X.

  The grooved lightweight steel 1 to which the present invention is applied has a height dimension H of about 80 mm to 450 mm in the height direction Y of the grooved lightweight steel 1 as shown in FIG. As shown in FIG. 2 (b), in the depth direction Z of the grooved lightweight section steel 1, the extension L in the depth direction Z is set to about 1 m to 20 m.

  As shown in FIG. 3, the pair of flanges 2 are provided on each of the upper side and the lower side in the height direction Y, and are disposed so as to extend substantially parallel to each other. The pair of flanges 2 are arranged on the upper side and the lower side in the height direction Y so that the positions in the width direction X overlap each other.

  In the pair of flanges 2, the flange 2 disposed on the upper side in the height direction Y is defined as an upper flange 21, and the flange 2 disposed on the lower side in the height direction Y is defined as a lower flange 22. Each of the upper flange 21 and the lower flange 22 has a plate thickness dimension tf and a width dimension B that are substantially the same or different from each other.

  Each flange 2 is made of, for example, a steel plate or the like in which both surfaces in the height direction Y are formed substantially flat, and the thickness tf is about 2.3 mm to 12.0 mm. Each flange 2 extends in the width direction X, and the width dimension B is about 40 mm to 200 mm.

  When each flange 2 has the right end in the width direction X as one side end 2a, the left end in the width direction X becomes the other side end 2b. Each flange 2 is formed to extend substantially linearly in the width direction X from one side end 2a in the width direction X to the other side end 2b, for example.

  The web 3 is made of, for example, a steel plate or the like in which both sides in the width direction X are formed substantially flat, and has a thickness dimension tw of about 2.3 mm to 6 mm. The web 3 extends in the height direction Y, and the height dimension h is about 55 mm to 445 mm.

  The web 3 is disposed on one side end 2 a side in the width direction X of the pair of flanges 2. When one side end 2a in the width direction X of the flange 2 is the right end, the web 3 is separated from the left end, which is the other side end 2b in the width direction X of the flange 2, and the width direction X of the flange 2 It is arranged close to the right end side.

  The web 3 is formed so as to extend substantially linearly in the height direction Y from the upper end portion 3a in the height direction Y to the lower end portion 3b. The web 3 has one of the upper end 3a and the lower end 3b in the height direction Y as one end in the height direction Y, and the upper end 3a and the lower end 3b in the height direction Y. Both become both ends in the height direction Y.

  The web 3 is arranged such that the upper end 3 a in the height direction Y is spaced apart from the upper flange 21 adjacent to the upper end 3 a of the web 3 with a predetermined interval S in the height direction Y. The web 3 is arranged such that the lower end 3b in the height direction Y is spaced apart from the lower flange 22 adjacent to the lower end 3b of the web 3 with a predetermined interval S in the height direction Y.

  When the web 3 is arranged such that the upper end 3a and the lower end 3b in the height direction Y are spaced apart from each of the upper flange 21 and the lower flange 22 in the height direction Y, Both end portions are arranged with an interval S in the height direction Y from both the pair of flanges 2. In addition, the space | interval S may be set with the mutually substantially same magnitude | size with each of the upper end part 3a and the lower end part 3b of the web 3, and may be set with a mutually different magnitude | size.

  The erection part 4 has an upper erection part 41 extending obliquely from the upper end part 3 a of the web 3 up to the upper flange 21 that is brought close to the upper end part 3 a of the web 3, and close to the lower end part 3 b of the web 3. The lower construction part 42 is extended to the lower flange 22 that is inclined from the lower end part 3b of the web 3.

  The erection part 4 includes an upper erection part 41 and a lower erection part 42 extending from the web 3 to each of the pair of flanges 2, and from the upper end part 3 a and the lower end part 3 b serving as both end parts of the web 3, The upper flange 21 and the lower flange 22 that are both the pair of flanges 2 are continuously installed.

  The erection part 4 is configured so that the upper erection part 41 and the lower erection part 42 are separated from one side end 2a of each flange 2 in the width direction X. Inclined and extends toward the side end 2b. For example, when the web 3 is disposed on the right end side in the width direction X of the flange 2, the erection portion 4 extends while being inclined toward the left end side in the width direction X of the flange 2.

  The erection part 4 includes an upper erection part 41 and a lower erection part 42 that are separated from one side end 2a in the width direction X of the flange 2 and welded to each of the upper flange 21 and the lower flange 22 by welding. Be joined. The erection part 4 is obtained by separating the joint portion W joined to the flange 2 by welding from the one side end 2a of the flange 2 in the width direction X in the width direction X by a predetermined separation distance Wf.

  The installation part 4 has a predetermined separation distance Wf from one side end 2a of the flange 2 to the joining point W joined to the flange 2. The width dimension b for examining the elastic buckling of the flange 2 is a larger one of the difference (B−Wf) between the separation distance Wf and the width dimension B of the flange 2 and the separation distance Wf.

  The erection part 4 extends in a substantially linear manner so that each of the upper erection part 41 and the lower erection part 42 is separated from one side end 2a of the flange 2 in the width direction X. The erection part 4 is not limited to this, and as shown in FIG. 4, each of the upper erection part 41 and the lower erection part 42 may be curved and inclined.

  The erection part 4 is curved so as to approach one side end 2a of the flange 2 as shown in FIG. 4A when each of the upper erection part 41 and the lower erection part 42 is curved and inclined. Alternatively, as shown in FIG. 4B, the flange 2 may be curved so as to be separated from one side end 2a.

  The erection part 4 is configured so that either the upper erection part 41 or the lower erection part 42 extends substantially linearly and either the upper erection part 41 or the lower erection part 42 is curved and extends. Good. At this time, the erection part 4 extends from both ends of the web 3 to both of the pair of flanges 2 in a substantially linear manner or in a curved manner.

  In the grooved lightweight steel 1 to which the present invention is applied, the plate thickness dimension tf of the upper flange 21 and the lower flange 22 and the plate thickness dimension tw of the web 3 can be made substantially the same. The grooved lightweight steel 1 to which the present invention is applied is not limited to this, and as shown in FIG. 5A, the plate thickness dimension tf of the upper flange 21 and the lower flange 22 is set to the plate thickness dimension tw of the web 3. Can be larger.

  Further, as shown in FIG. 5 (b), the grooved lightweight section steel 1 to which the present invention is applied has only the plate thickness dimension tf of either the upper flange 21 or the lower flange 22 as the plate thickness of the web 3. It can also be larger than the dimension tw. At this time, the grooved lightweight section steel 1 to which the present invention is applied is such that the web 3 is formed with a plate thickness thinner than either one or both of the pair of flanges 2.

  As shown in FIG. 3, the grooved lightweight steel 1 to which the present invention is applied can have the upper flange 21 and the lower flange 22 having substantially the same width B. The grooved lightweight steel 1 to which the present invention is applied is not limited to this, and the width dimension B1 of the upper flange 21 is made larger than the width dimension B2 of the lower flange 22 as shown in FIG. Can do.

  Moreover, the grooved lightweight steel 1 to which the present invention is applied can make the width dimension B2 of the lower flange 22 larger than the width dimension B1 of the upper flange 21, as shown in FIG. At this time, in the lightweight lightweight steel 1 to which the present invention is applied, the width dimension B of one of the pair of flanges 2 is larger than the width dimension B of the other flange 2.

  As shown in FIG. 7A, the grooved lightweight steel 1 to which the present invention is applied has a left side in the width direction X of the flange 2 when the web 3 is disposed on the right end side in the width direction X of the flange 2. A lip portion 20 that is bent at a substantially right angle from the end and protrudes in the height direction Y may be formed on each of the pair of flanges 2.

  At this time, the grooved lightweight section steel 1 to which the present invention is applied has the web 3 disposed at one side end 2a in the width direction X of the pair of flanges 2 and the other of the pair of flanges 2 in the width direction X. A pair of lip portions 20 projecting opposite to each other in the height direction Y are formed on the side end 2b of the rim, thereby forming a lip-shaped grooved lightweight section steel.

  As shown in FIG. 7B, the grooved lightweight steel 1 to which the present invention is applied is such that only the upper end 3 a of the web 3 is separated from the upper flange 21 and the lower end 3 b of the web 3 is the lower flange 22. Only the upper erection part 41 extending from the upper end part 3a of the web 3 may be provided as the erection part 4 by being connected without being separated from each other.

  At this time, in the grooved lightweight steel 1 to which the present invention is applied, only one end portion in the height direction Y of the web 3 is from the one flange 2 adjacent to the end portion of the web 3 in the height direction. While being arranged with an interval S in Y, the erection part 4 extends at an angle from one end part in the height direction Y of the web 3 to one flange 2 adjacent to the end part of the web 3. It will be a thing.

  As shown in FIG. 8A, the grooved lightweight steel 1 to which the present invention is applied has a separation distance Wf in the width direction X from one side end 2 a of the flange 2 to the joining point W of the erection part 4. The distance S in the height direction Y from the flange 2 to the end portion of the web 3 is formed to have substantially the same size. At this time, in the grooved lightweight section steel 1 to which the present invention is applied, the angle θ of the outer angle formed by the virtual extension line extending in the height direction Y of the web 3 and the erection part 4 is about 45 °.

  The grooved lightweight section steel 1 to which the present invention is applied is not limited to this, and the separation distance Wf from one side end 2a of the flange 2 to the joining point W is from the flange 2 as shown in FIG. It may be formed smaller than the interval S to the end portion of the web 3 or may be formed larger than the interval S from the flange 2 to the end portion of the web 3 as shown in FIG. .

  The grooved lightweight steel 1 to which the present invention is applied has an outer angle θ formed by a virtual extension line of the web 3 and the erection part 4 of 10 ° or more when the separation distance Wf is smaller than the distance S. , Less than 45 °, and when the separation distance Wf is larger than the interval S, it is more than 45 ° and not more than 80 °. Further, in the grooved lightweight steel 1 to which the present invention is applied, it is particularly desirable that the external angle θ formed by the virtual extension line of the web 3 and the erection part 4 is 15 ° or more and 75 ° or less.

  As shown in FIGS. 9 and 10, the grooved lightweight steel 1 to which the present invention is applied includes a pair of flanges 2 extending in the width direction X and a web extending in the height direction Y through a predetermined manufacturing process. 3 are connected to each other by an erection part 4 erected from the web 3 to the flange 2.

  In the manufacturing process of the grooved lightweight section steel 1, when each of the upper erection part 41 and the lower erection part 42 is joined to each of the upper flange 21 and the lower flange 22 by welding, for example, high-frequency resistance welding is performed. For example, the joining portion W of the installation part 4 is joined.

  In the manufacturing process of the grooved lightweight section 1, first, as shown in FIG. 9A, a pair of flange steel plates 82 extending in the width direction X and a web steel plate 83 extending in the height direction Y are prepared. To do. The steel plate 83 for the web is a pair of inclined pieces that become each of the upper erection part 41 and the lower erection part 42 by being inclined and bent in the width direction X from each of the upper end part 3 a and the lower end part 3 b of the web 3. 84 is formed.

  At this time, the web steel plate 83 is arranged such that the tip end portion 84 a of the inclined piece 84 protrudes toward each of the pair of flange steel plates 82, and the base end portion 84 b of the inclined piece 84 is the upper end of the web 3. It is connected to each of the part 3a and the lower end part 3b. In the web steel plate 83, the base end portion 84b of the inclined piece 84 may be joined to each of the upper end portion 3a and the lower end portion 3b of the web 3 by welding.

  Next, in the manufacturing process of the grooved lightweight section 1, as shown in FIG. 9B, each of the pair of inclined pieces 84 or each of the upper end 3a side and the lower end 3b side of the steel plate 83 for web. The electrode 81 is also attached to a range from the one side end 2a of the flange steel plate 82 to the joining point W.

  In the manufacturing process of the grooved lightweight section steel 1, finally, a current is supplied from the high-frequency power source 80 to each electrode 81, and the flanged steel plate 82 and the inclined piece 84 are heated, whereby the inclined piece 84 is used for the flange. Joined to the steel plate 82, the flange steel plate 82 becomes the flange 2, the web steel plate 83 becomes the web 3, and the inclined piece 84 becomes the erection part 4. The

  As shown in FIG. 10 (a), the grooved lightweight section steel 1 to which the present invention is applied is provided with a pair of flange steel plates 82 and a web steel plate 83 extending substantially linearly in the height direction Y. The substantially straight web steel plate 83 may be joined to the flange steel plate 82.

  At this time, in the grooved lightweight steel 1 to which the present invention is applied, the electrodes 81 are first attached to both ends of the steel plate 83 for web, and the electrodes 81 are also provided on one side end 2a side of the steel plate 82 for flanges. In addition, a current is supplied from the high-frequency power source 80 to each electrode 81, and the flange steel plate 82 and the web steel plate 83 are heated and joined.

  As shown in FIG. 10 (b), the grooved lightweight section steel 1 to which the present invention is applied, after joining the substantially straight web steel plate 83 to the flange steel plate 82, for example, the height from the flange steel plate 82. By applying a pressing force P in the width direction X to both ends of the web steel plate 83 at a position separated by about 10 mm in the direction Y, the inclined pieces 84 that are inclined and bent in the width direction X are formed into the web steel plate. 83 are formed at both ends.

  The grooved lightweight section steel 1 to which the present invention is applied has a substantially straight web steel plate 83 joined to a flange steel plate 82, and a pressing force P is applied to both ends of the web steel plate 83 so that an inclined piece is obtained. By forming 84, the flange steel plate 82 becomes the flange 2, the web steel plate 83 becomes the web 3, and the inclined piece 84 becomes the installation part 4.

  In the lightweight lightweight steel 1 to which the present invention is applied, an electrode 81 having a width of about 20 mm, for example, is attached in a range from one side end 2a of the flange steel plate 82 to the joint location W. At this time, in the lightweight lightweight steel 1 to which the present invention is applied, the separation distance Wf obtained by separating the joining portion W of the erection portion 4 from the one side end 2a in the width direction X of the flange 2 is expressed by the following (1). By satisfying the relationship defined by the expression, it is possible to secure an installation space for the electrode 81 having a predetermined width dimension. Here, B: The width dimension of the flange 2 (B> 20 mm).

[Equation 3]
20 mm ≦ Wf ≦ 1.0 × B (1)

  Here, in order to verify the advantage of buckling strength in the grooved lightweight steel 1 to which the present invention is applied, as shown in FIG. 11, substantially the same cross section as the grooved lightweight steel 1 to which the present invention is applied. The conventional grooved lightweight steel 9 formed in the shape is compared, and the conventional grooved lightweight steel 9 shown in FIG. 11 (a) and the groove to which the present invention shown in FIG. 11 (b) is applied. As shown in Fig. 11 (c), by applying equal bending load M around the strong axis to both ends in the depth direction Z, compare the magnitude of the moment at the time of elastic buckling. consider.

  Here, as shown in FIG. 11, in each of the grooved lightweight section steel 1 and the conventional grooved lightweight section steel 9 to which the present invention is applied, the height dimension H is 400 mm, the width dimension B of the flange 2 is 100 mm, The strip plate element model was analyzed with the plate thickness dimension tf of the flange 2 being 4.5 mm and the plate thickness dimension tw of the web 3 being 3.2 mm. In this analysis, the length L in the depth direction Z is selected for each cross-sectional shape so that the moment during elastic buckling is minimized.

  The conventional grooved light weight steel 9 is provided with flanges 92 directly and continuously from both ends in the height direction Y of the web 93, and the erected portion 4 like the grooved light weight steel 1 to which the present invention is applied. Is not provided. In this analysis, the grooved lightweight steel 1 to which the present invention is applied matches the separation distance Wf of the joining portion W of the erection part 4 with the distance S to the upper end part 3a or the lower end part 3b of the web 3, The separation distance Wf is changed.

  In this analysis, the separation distance Wf of the joint location W is set as a ratio (= Wf / B) to the width dimension B of the flange 2, and the equal bending load M is within a range where Wf / B is changed to 0-1. The magnitude of the moment at the time of elastic buckling due to the load is obtained by analysis. In particular, when Wf / B = 0, the magnitude of moment at the time of elastic buckling of the conventional grooved lightweight steel 9 in which the erection part 4 is not provided is shown.

  As a result of this analysis, as shown in FIG. 12, when Wf / B = 0, the moment at the time of elastic buckling shows the minimum value, and the elasticity is within the range of 0.2 ≦ Wf / B ≦ 1.0. Since the moment at the time of buckling shows a relatively large value, the grooved lightweight section steel 1 to which the present invention is applied is provided with the erection part 4 so that the conventional grooved lightweight section steel 9 (Wf / B = 0). It can be seen that the buckling resistance is higher than

  Therefore, the grooved lightweight section steel 1 to which the present invention is applied, as shown in FIG. When the separation distance Wf separated from 2a satisfies the relationship defined by the following equation (2), it is possible to ensure high buckling strength.

[Equation 4]
0.2 × B ≦ Wf ≦ 1.0 × B (2)

  As shown in FIG. 12, the grooved lightweight section steel 1 to which the present invention is applied further has a conventional grooved lightweight section steel 9 (Wf / B = in the range of 0.4 ≦ Wf / B ≦ 0.7). Compared with 0), the magnitude of the moment at the time of elastic buckling shows a value as large as three times or more. For this reason, as shown in FIG. 11, the grooved lightweight section steel 1 to which the present invention is applied satisfies the relationship defined by the following expression (3) in the separation distance Wf of the joining portion W of the erection part 4 In particular, it is possible to ensure a high buckling strength.

[Equation 5]
0.4 × B ≦ Wf ≦ 0.7 × B (3)

  The grooved lightweight steel 1 to which the present invention is applied has a distance of 20 mm ≦ Wf ≦ 100 mm when the width B of the flange 2 is set to 100 mm and the separation distance Wf is defined by the above equation (2). At the same time, the relationship defined by the formula is satisfied.

  The grooved lightweight steel 1 to which the present invention is applied has a width dimension b for examining the elastic buckling of the flange 2 as shown in FIG. 13 by gradually increasing Wf / B in the range of 0 to 1, The width-thickness ratio (b / tf) of the width dimension b of the flange 2 is smaller than that of the conventional grooved lightweight steel 9 shown in FIG. It will be a thing.

  As shown in FIG. 13 (b), the grooved lightweight section steel 1 to which the present invention is applied has a width-thickness ratio (b / tf) of the width dimension b of the flange 2 when Wf / B = 0.5. It becomes possible to ensure high buckling strength especially by becoming small. Note that the grooved lightweight section steel 1 to which the present invention is applied tends to buckle the side receiving the compressive force of the web 3 before and after elastic buckling when Wf / B = 0.5.

  Further, as shown in FIG. 13 (c), the grooved lightweight section steel 1 to which the present invention is applied has a larger interval S from the flange 2 to the web 3 when Wf / B = 0.7, and the web The height dimension h of 3 is smaller than the plate thickness dimension tw of the web 3. The grooved lightweight section steel 1 to which the present invention is applied has a tendency that the erected portion 4 buckles before and after elastic buckling when Wf / B = 0.7.

  At this time, the grooved lightweight section steel 1 to which the present invention is applied, when Wf / B = 0.5, the width-to-thickness ratio of the flange 2 is reduced, so that the deformation in the height direction Y of the flange 2 is reduced. When Wf / B = 0.7 is suppressed, the width / thickness ratio of the flange 2 becomes smaller, and the height dimension h of the web 3 becomes smaller than the plate thickness dimension tw of the web 3. Thus, the width-thickness ratio (h / tw) of the height dimension h of the web 3 becomes small, the deformation in the height direction Y of the flange 2 and the width direction X of the web 3 is suppressed, and a high buckling strength is achieved. It can be secured.

  The grooved lightweight section steel 1 to which the present invention is applied has the erection part 4 from either one or both ends of the web 3 to one or both of the pair of flanges 2 adjacent to the end of the web 3. By being installed, high bending rigidity and buckling strength can be ensured.

  The groove-shaped lightweight steel 1 to which the present invention is applied, in particular, as shown in FIG. 14, a pair of groove-shaped lightweight steel 1 is brought into contact with or separated from each other, and the respective webs 3 are back-to-back with each other. The shape is similar to the shape steel, and the overall bending rigidity and buckling strength of the structural member 8 such as a beam or a column can be improved.

  As shown in FIG. 14 (a), the grooved lightweight steel 1 to which the present invention is applied has one side end 2 a of the flange 2 and an upper end 3 a and a lower end 3 b of the web 3 in the width direction X. Arranged at approximately the same position. In addition, as shown in FIG. 14B, the grooved lightweight section steel 1 to which the present invention is applied has one side end 2a of the flange 2 and an upper end 3a and a lower end 3b of the web 3 in the width direction. X may be arranged at different positions.

  At this time, the structural member 8 such as a beam or a column has a groove-shaped lightweight steel 1 in which one side end 2a of the flange 2 is arranged closer to the joining portion W in the width direction X than the end of the web 3. And the groove-shaped lightweight section steel 1 in which one side end 2a of the flange 2 is arranged so as to protrude in the width direction X from the end of the web 3 and the webs 3 are back to back. Become.

  Here, as for the conventional groove-shaped lightweight steel 9, the flange 92 and the web 93 are integrally formed from a steel plate or a coil by performing press work or roll forming. Therefore, in the conventional lightweight lightweight steel 9, the plate thickness of the flange 92 and the plate thickness of the web 93 are substantially the same, and the plate thickness of the web 93 can be matched to the plate thickness of the flange 92 where a large stress is generated. Since it is necessary, the thickness of the flange 92 and the web 93 cannot be made different depending on the magnitude of the generated stress, and the rational and economical groove-shaped lightweight steel 9 cannot be provided. .

  On the other hand, the grooved lightweight steel 1 to which the present invention is applied extends from one or both ends of the web 3 to one or both of the pair of flanges 2 adjacent to the end of the web 3. Since the erection part 4 is erected and the web 3 and the flange 2 are independently connected to each other by the erection part 4 by resistance welding or the like, the web 3 has a plate thickness thinner than that of the flange 2 as shown in FIG. Can be formed.

  At this time, the grooved lightweight steel 1 to which the present invention is applied causes a greater stress on the flange 2 than the web 3 due to the bending load around the strong axis acting on the grooved lightweight steel 1. Each of the flange 2 and the web 3 can be made independent and set to individual plate thicknesses according to the magnitude of the generated stress.

  As a result, as shown in Table 1, the grooved lightweight section steel 1 to which the present invention is applied has a smaller thickness tw of the web 3 of the present invention than the conventional grooved lightweight section steel 9 as a comparative example. Therefore, the cross-sectional secondary moment (bending rigidity) per unit weight of the grooved lightweight section steel 1 is 10% to 20% as compared with the conventional grooved lightweight section steel 9 having substantially the same sectional shape. Since it can be improved to some extent (see Table 1 “Conventional ratio” column), it is possible to provide a rational and economical groove-shaped lightweight steel 1 according to the magnitude of the generated stress.

  As shown in FIGS. 3 and 8C, the grooved lightweight steel 1 to which the present invention is applied has an interval S from the flange 2 to the end of the web 3 that is joined from one side end 2 a of the flange 2. By forming the web 3 so that the height dimension h of the web 3 is larger than the separation distance Wf to the location W, a through hole for piping of a predetermined size penetrating in the plate thickness direction is formed in the web 3. It can also be formed.

  As mentioned above, although the example of embodiment of this invention was demonstrated in detail, all the embodiment mentioned above showed only the example of actualization in implementing this invention, and these are the technical aspects of this invention. The range should not be construed as limiting.

DESCRIPTION OF SYMBOLS 1: Channel type lightweight shape steel 2: Flange 2a: One side end 2b: The other side end 20: Lip part 21: Upper side flange 22: Lower side flange 3: Web 3a: Upper end 3b: Lower end 4: Construction part 41: Upper erection part 42: Lower erection part 8: Structural member 80: High frequency power supply 81: Electrode 82: Steel plate for flange 83: Steel plate for web 84: Inclined piece 84a: Tip end 84b: Base end W: Joint location X: Width Direction Y: Height direction Z: Depth direction

Claims (7)

It is a grooved lightweight section steel that extends in the depth direction with a predetermined cross-sectional shape,
A pair of flanges extending in the width direction in the cross-sectional direction, a web extending in the height direction on one side end side in the width direction of the pair of flanges, and an erection part constructed from the web to the flange,
The web is arranged such that either one or both ends in the height direction are spaced apart in the height direction from the flange adjacent to the end.
The erected portion extends from the end portion of the web to the flange adjacent to the end portion so as to be separated from one side end in the width direction of the flange, and is joined to the flange by welding. A groove-shaped lightweight steel characterized by The grooved lightweight section steel according to claim 1, wherein the web is formed with a plate thickness thinner than any one or both of the pair of flanges. The installation portion satisfies a relation defined by the following expression (1), wherein a separation distance Wf obtained by separating a joining portion to be joined to the flange from one side end in the width direction of the flange. The grooved lightweight section steel according to claim 1 or 2.

20 mm ≦ Wf ≦ 1.0 × B (1)

Here, B: The width dimension of the flange (B> 20 mm). The installation portion satisfies a relation defined by the following expression (2), wherein a separation distance Wf obtained by separating a joining portion to be joined to the flange from one side end in the width direction of the flange. The grooved lightweight section steel according to any one of claims 1 to 3.

0.2 × B ≦ Wf ≦ 1.0 × B (2)

Here, B: the width of the flange. The erected portion extends from the end portion of the web to the flange adjacent to the end portion so as to be separated from one side end in the width direction of the flange so as to be substantially linear or curved. The grooved lightweight section steel according to any one of claims 1 to 4. 6. The grooved lightweight type according to claim 1, wherein the pair of flanges has a width dimension of one of the flanges larger than a width dimension of the other flange. steel. A pair of said flanges are formed with a pair of lip portions projecting in the height direction at the other side end in the width direction of each said flange. 1. The grooved lightweight section steel according to item 1.

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