Structural steel plate and method of manufacturing the steel plate

Abstract

To suppress fracture of a steel plate without increasing material cost.SOLUTION: A steel plate 5 of a structural material is provided with a body 11 which can be incorporated into the structure. The body 11 can be surrounded by a stiffener 6 made of a wood material. The body 11 includes a center plate 12 having a predetermined length and width and a joining plate 13 having a width larger than the center plate 12. The joint plate 13 is welded to both ends of the center plate 12 in the longitudinal direction. According to this configuration, since there is no portion to be cut off when forming the body 11, the material cost in manufacturing the steel plate 5 does not become high. In addition, since both side surfaces of the body 11 in the width direction of the center plate 12 are not cut surfaces, both side surfaces are not damaged by cutting, and as a result, when a force is repeatedly applied in the longitudinal direction of the steel plate 5, the steel plate 5 is prevented from being broken due to the damage.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a steel plate for a structural material and a method for manufacturing the steel plate. [Background technology]

[0002] Structural materials are incorporated into structures such as buildings. Structural materials include structural members such as columns and beams. Structural materials also include braces that reinforce structures. Braces are placed between structural members, i.e., between columns and beams.

[0003] Patent Document 1 discloses a buckling-restrained brace as one type of brace. By incorporating this buckling-restrained brace into a structure such as a building, the strength and rigidity of the structure can be increased. The buckling-restrained brace is formed by surrounding a steel plate of a specified length with a stiffener made of wood material. The stiffener is intended to prevent the steel plate from buckling when compressed in the longitudinal direction.

[0004] Furthermore, the steel plate described in Patent Document 1 has a main body that can be incorporated into a structure, and the main body is surrounded by the stiffener. The main body of the steel plate has a central plate of a specified length and width and connecting plates that are wider than the central plate. The connecting plates are arranged on both longitudinal ends of the central plate and are integral with the central plate. When the buckling restrained brace is incorporated into a structure such as a building, the connecting plates of the steel plate are joined to the structure.

[0005] When manufacturing the steel plate, the main body of the steel plate is formed by cutting off a portion of a rectangular metal blank of a predetermined length as follows: That is, the central plate and the connecting plates of the main body are formed by cutting off a portion of the blank so that the width of the blank at locations other than both longitudinal ends is smaller than the width of both ends. The reason why the width of the central plate of the main body of the steel plate is made smaller than the width of the connecting plates is that when a force acts on the steel plate in its longitudinal direction and the steel plate yields, the yield occurs at the central plate, not at the connecting plates connected to the structure. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 6942279 Summary of the Invention [Problem to be solved by the invention]

[0007] When forming the main body of a steel plate for a structural material by cutting off a portion of a rectangular metal blank of a predetermined length as described above, the blank must be made larger to allow for such cutting. This increases the material cost of the blank and increases the labor required to transport the blank. Furthermore, if scratches are created on the cut surface when cutting off the blank, repeated force acting in the longitudinal direction of the steel plate may cause the steel plate to break. [Means for solving the problem]

[0008] The means for solving the above problems and their effects will be described below. The structural steel plate that solves the above problem includes a main body that can be incorporated into a structure. The main body can be surrounded by stiffeners made of wood. The main body also includes a center plate of a specified length and width and connecting plates that are wider than the center plate. The connecting plates are welded to both ends of the center plate in the longitudinal direction.

[0009] According to the above configuration, by welding the joining plates to both longitudinal ends of the center plate, a main body is formed with joining plates having a width greater than that of the center plate. In this case, there are no areas that need to be cut off when forming the main body from the steel plate, so the material costs for manufacturing the steel plate are not high. Furthermore, since both side surfaces of the center plate in the width direction of the main body are not cut surfaces, scratches due to cutting do not occur on these side surfaces. As a result, when repeated forces are applied to the steel plate in the longitudinal direction, breakage of the steel plate due to the scratches is suppressed.

[0010] The steel plates of the structural material include end plates that extend across the boundaries between the longitudinal ends of the center plate and the joining plates, and are arranged perpendicular to and welded to the longitudinal ends of the center plate and the joining plates.

[0011] According to the above configuration, the end plates strengthen the connection between the central plate and the connecting plate in the main body. The steel plates of the structural material include reinforcing plates disposed at corners formed by longitudinal ends of the center plate and the joining plates, and the reinforcing plates are welded to the center plate and the joining plates, respectively.

[0012] According to the above configuration, the strength of the vicinity of the joint portion between the center plate and the joint plate in the main body can be increased by the reinforcing plate. The method for manufacturing a steel plate that solves the above-mentioned problems is applied to a structural steel plate having a body that can be incorporated into a structure and surrounded by stiffeners made of wood material. The body of the steel plate is formed by welding connecting plates, each having a width greater than that of the central plate, to both longitudinal ends of the central plate of a predetermined length and width.

[0013] According to the above method, a steel plate body is formed with joining plates each having a width greater than that of the center plate by welding joining plates to both longitudinal ends of the center plate. In this case, there are no areas that need to be cut off when forming the steel plate body, so the material costs for manufacturing the steel plate are not high. Furthermore, since both side surfaces of the center plate in the width direction of the body are not cut surfaces, scratches due to cutting do not occur on these side surfaces. As a result, when repeated forces are applied to the steel plate in the longitudinal direction, breakage of the steel plate due to the scratches is suppressed.

[0014] In the above-described method for manufacturing a steel plate, after welding the joining plates to both longitudinal ends of the center plate, end plates are arranged perpendicular to and straddling the longitudinal ends of the center plate and the joining plates, and the steel plate is formed by welding the end plates to the longitudinal ends of the center plate and the joining plates.

[0015] According to the above method, the connection between the center plate and the connecting plate in the steel body is strengthened by the end plates. In the above-mentioned steel plate manufacturing method, after welding the joining plates to both longitudinal ends of the center plate, a reinforcing plate welding process is performed in which a reinforcing plate is placed at the corner formed by the longitudinal end of the center plate and the joining plate, and the reinforcing plate is welded to the center plate and the joining plate. Then, after the reinforcing plate welding process, an end plate is placed so as to be perpendicular to and straddle the longitudinal end of the center plate and the joining plate, and the end plate welding process is performed in which the steel plate is formed.

[0016] According to the above method, the strength of the vicinity of the joint between the center plate and the joint plate in the main body can be increased by the reinforcing plate. [Brief explanation of the drawings]

[0017] [Figure 1] FIG. 1 is a side view showing a buckling restraint brace incorporated into a structure such as a building. [Figure 2] FIG. 2 is an exploded perspective view showing the buckling restraint brace. [Figure 3] FIG. 2 is a side view showing the main body of the steel plate in the buckling restraint brace. [Figure 4] FIG. 2 is a plan view showing the main body of the steel plate in the buckling restrained brace. [Figure 5] 10 is a plan view showing how a reinforcing plate is attached to the main body of the steel plate. FIG. [Figure 6] FIG. 10 is a plan view showing how the end plate is attached to the main body of the steel plate. [Figure 7] FIG. 10 is a side view showing how the end plate is attached to the main body of the steel plate. [Figure 8] FIG. 2 is a side view showing the steel plate. [Figure 9] FIG. 2 is a plan view showing the steel plate. DETAILED DESCRIPTION OF THE INVENTION

[0018] Hereinafter, one embodiment of a steel plate for a structural material and a method for manufacturing the steel plate will be described with reference to FIGS. As shown in Figure 1, a structure such as a building incorporates structural members such as columns 1 and beams 2. A plurality of gusset plates 3 are attached to the structural members at predetermined distances. Buckling restraint braces 4 are incorporated between the gusset plates 3 as structural members. The buckling restraint braces 4 are intended to increase the strength and rigidity of the structure.

[0019] As shown in Figure 2, a buckling-restrained brace 4 is formed by surrounding a steel plate 5 of a specified length with stiffeners 6 made of wood. The stiffeners 6 are intended to prevent the steel plate 5 from buckling when compressed in the longitudinal direction. For example, laminated timber, in which plate materials are stacked in the width direction of the steel plate 5, is used as the stiffener 6. Note that cross-laminated timber (CLT) or laminated veneer lumber (LVL) can also be used as the stiffener 6.

[0020] <Detailed structure of steel plate 5> The steel plate 5 has a main body 11 of a predetermined length that can be incorporated into a structure. The main body 11 has a central plate 12 of a predetermined length and width, and connecting plates 13 of a width greater than the width of the central plate 12. The connecting plates 13 are welded to both longitudinal end faces of the central plate 12 by full penetration welding or the like. At this time, both widthwise side faces of the connecting plates 13 extend outward in the width direction from both widthwise side faces of the central plate 12.

[0021] In addition to the main body 11, the steel plate 5 also includes an end plate 7 and a reinforcing plate 14. The end plate 7 extends across the boundary between the longitudinal end of the center plate 12 and the connecting plate 13. The end plate 7 is arranged perpendicular to the longitudinal end of the center plate 12 and the widthwise center of the connecting plate 13. The end plate 7 is welded to the longitudinal end of the center plate 12 and the widthwise center of the connecting plate 13 by fillet welding or the like. The reinforcing plate 14 is formed in the shape of a right triangle. The reinforcing plate 14 is arranged at the corner formed by the longitudinal end of the center plate 12 and the connecting plate 13. The reinforcing plate 14 is welded to the center plate 12 and the connecting plate 13 by full penetration welding or the like.

[0022] <Relationship between steel plate 5 and stiffener 6> The stiffeners 6 are arranged on both sides of the central plate 12 in the thickness direction. By fastening these stiffeners 6 to each other with bolts or the like, the central plate 12 of the main body 11 of the steel plate 5 is surrounded by the stiffeners 6. In this case, all but the longitudinal ends of the central plate 12 of the main body 11 of the steel plate 5 are located inside the stiffeners 6, and the joining plates 13 of the main body 11 are exposed from the stiffeners 6. In addition, only a portion of each of the end plates 7 and reinforcing plates 14 of the steel plate 5 and the longitudinal ends of the central plate 12 of the main body 11 are exposed from the stiffeners 6.

[0023] <Incorporating buckling restraint braces 4 into structures> As shown in Figure 1, the end of the steel plate 5 and the gusset plate 3 are fixed by splice plates 16 and 17. More specifically, the splice plate 16 is bolted to the gusset plate 3 and the connecting plate 13 of the main body 11 of the steel plate 5. Furthermore, the splice plate 17 is bolted to the gusset plate 3 and the end plate 7 of the steel plate 5. As a result, both end portions of the steel plate 5 are fixed to the gusset plate 3. As a result, the steel plate 5 is incorporated into the structure.

[0024] Next, a method for manufacturing the steel plate 5 will be described with reference to FIGS. When manufacturing the steel plate 5, first, as shown in Figures 3 and 4, joining plates 13 are placed near both longitudinal ends of the center plate 12. Then, the joining plates 13 are welded to both longitudinal ends of the center plate 12 as shown by the arrows in Figures 3 and 4, thereby forming the main body 11 of the steel plate 5. After the main body 11 is formed in this way, the following reinforcing plate welding process and end plate welding process are carried out in order.

[0025] <Reinforcing plate welding process> In this process, after welding the joining plates 13 to both longitudinal ends of the center plate 12, as shown in Fig. 5, the reinforcing plates 14 are placed in the corners formed by the longitudinal ends of the center plate 12 and the joining plates 13. Then, as shown by the arrows in Fig. 5, the reinforcing plates 14 are welded to the center plate 12 and the joining plates 13, respectively.

[0026] <End plate welding process> In this step, after the reinforcing plate welding step is performed, the end plate 7 is positioned so as to be perpendicular to the longitudinal end of the center plate 12 and the joining plate 13 and straddle both of them, as shown by the arrows in Fig. 6. Then, as shown by the arrows in Fig. 7, the end plate 7 is welded to the longitudinal end of the center plate 12 and the joining plate 13. In this way, the steel plate 5 is formed as shown in Figs. 8 and 9.

[0027] According to the present embodiment described above in detail, the following advantageous effects can be obtained. (1) The main body 11 of the steel plate 5 is provided with joining plates 13 that are wider than the central plate 12 by welding the joining plates 13 to both longitudinal ends of the central plate 12. In this case, there are no areas that need to be cut off when forming the main body 11 of the steel plate 5, so the material costs for manufacturing the steel plate 5 do not increase. Furthermore, since both side surfaces of the main body 11 in the width direction of the central plate 12 are not cut surfaces, scratches due to cutting do not occur on these both sides. As a result, when repeated forces act on the steel plate 5 in the longitudinal direction, the steel plate 5 is prevented from breaking due to the scratches.

[0028] (2) The steel plate 5 is provided with end plates 7 that extend across the boundaries between the longitudinal ends of the central plate 12 and the joining plates 13. The end plates 7 are arranged perpendicular to and welded to the longitudinal ends of the central plate 12 and the joining plates 13. As a result, the end plates 7 strengthen the joints between the central plate 12 and the joining plates 13 in the main body 11 of the steel plate 5.

[0029] (3) The steel plate 5 includes a reinforcing plate 14 disposed at a corner formed by the longitudinal end of the central plate 12 of the main body 11 and the joining plate 13. The reinforcing plate 14 is welded to the central plate 12 and the joining plate 13. As a result, the reinforcing plate 14 can increase the strength of the main body 11 near the joining point between the central plate 12 and the joining plate 13.

[0030] The above embodiment can be modified as follows, for example: The above embodiment and the following modifications can be combined and implemented within the scope of technical compatibility. The reinforcing plate 14 of the steel plate 5 may be omitted. In this case, the reinforcing plate welding step during the production of the steel plate 5 is omitted.

[0031] The end plates 7 of the steel plate 5 may be omitted. In this case, the end plate welding step when manufacturing the steel plate 5 is omitted. Although the buckling restrained brace 4 is shown as an example of a structural member having a steel plate 5, the structural member may also be a frame member such as a column 1 and a beam 2. [Explanation of symbols]

[0032] 1... Pillar 2…Beam 3... Gusset plate 4...Buckling restraint brace 5...Steel plate 6...Stiffener 7...End plate 11...Main unit 12...Central plate 13...Joining plate 14...Reinforcing plate 16,17...Splinth

Claims

1. A structural steel plate having a main body that can be incorporated into a structure, and the main body can be surrounded by a stiffener made of wood material, The main body includes a rectangular central plate having a predetermined length and width, and a joining plate having a width greater than that of the central plate, The joining plates are fully welded to the longitudinal end faces of the central plate at their respective side surfaces, A structural steel plate in which right-angle corners are formed by the longitudinal ends of the center plate and the joining plates.

2. end plates extending across the boundaries between the longitudinal ends of the central plate and the joining plates; The end plates are arranged perpendicular to the longitudinal ends of the center plate and the joining plates and welded to them; 2. A structural steel plate according to claim 1, wherein the end plates have right-angled corners at points where the amount of protrusion from the central plate and the joining plate is changed.

3. a reinforcing plate disposed at a corner formed by an end portion of the center plate in the longitudinal direction and the joining plate; 3. The steel plate for a structural material according to claim 1, wherein the reinforcing plate is welded to the center plate and the joining plate, respectively.

4. It is applied to a steel plate of a structure having a body that can be incorporated into a structure and that can be surrounded by a stiffener made of wood material, The main body of the steel plate is formed by fully penetrating the end faces of both longitudinal ends of a rectangular central plate of a specified length and width, and the sides connecting the front and back surfaces of a joining plate of a width greater than that of the central plate, to form right-angle corners between the longitudinal ends of the central plate and the joining plate.

5. the joining plates are welded to both longitudinal ends of the center plate, and then end plates are arranged so as to be perpendicular to and straddle the longitudinal ends of the center plate and the joining plates, and the end plates are welded to the longitudinal ends of the center plate and the joining plates, thereby forming the steel plate; The method for manufacturing steel plates according to claim 4, wherein the end plates are formed with right-angled corners at the locations where the amount of protrusion from the center plate and the joining plate is changed.

6. a reinforcing plate welding step in which, after welding the joining plates to both longitudinal ends of the center plate, reinforcing plates are placed at corners formed by the longitudinal ends of the center plate and the joining plates, and the reinforcing plates are welded to the center plate and the joining plates, respectively; 5. A method for manufacturing a steel plate according to claim 4, wherein after the reinforcing plate welding process, an end plate is positioned so as to be perpendicular to and straddle the longitudinal end of the center plate and the joining plate, and the end plate is welded to the longitudinal end of the center plate and the joining plate, thereby forming a steel plate.

Images