Truss structure

Abstract

To provide a truss structure allowing a connection structure between steel chord members and steel columns to be simplified while suppressing lateral buckling of the steel chord members.SOLUTION: A truss structure 10 is provided with a steel column 20; and a steel chord member 40 having: an end part of a chord member 44 formed of H-shaped steel of which a strong axis direction is oriented vertically; and a chord intermediate section 42 formed of H-shaped steel of which a strong axis direction is oriented laterally and connected to the steel column 20 through the end part of the chord member 44.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a truss structure.

Background Art

[0002] There is known a truss structure including a steel truss chord member formed of an H-shaped steel with the strong axis direction being the lateral direction (see, for example, Patent Documents 1 and 2).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the truss structures disclosed in Patent Documents 1 and 2, by setting the strong axis direction of the steel truss chord member to the lateral direction, lateral buckling of the steel truss chord member is suppressed.

[0005] However, when the strong axis direction of the H-shaped steel steel truss chord member is set to the lateral direction, the joining structure between the steel column and the steel truss chord member becomes complicated.

[0006] As a countermeasure, for example, it is conceivable to form the end portion of the steel truss chord member in a bracket form and weld the end bracket to the steel column in advance at a factory or the like.

[0007] However, when the end bracket is welded to the steel column in advance at a factory or the like, the transportability of the steel column is reduced.

[0008] In consideration of the above facts, an object of the present invention is to simplify the joining structure between the steel truss chord member and the steel column while suppressing lateral buckling of the steel truss chord member.

Means for Solving the Problems

[0009] The truss structure according to claim 1 comprises a steel column, a chord end formed by an H-shaped steel with the strong axis direction being the vertical direction, and a chord middle part formed by an H-shaped steel with the strong axis direction being the horizontal direction and joined to the steel column through the chord end, and a steel chord having the same.

[0010] According to the truss structure according to claim 1, the steel chord has a chord end and a chord middle part. The chord end is formed by an H-shaped steel with the strong axis direction being the vertical direction. Further, the chord middle part is formed by an H-shaped steel with the strong axis direction being the horizontal direction and joined to the steel column through the chord end.

[0011] Here, by forming the chord middle part of the steel chord with an H-shaped steel with the strong axis direction being the horizontal direction, lateral buckling of the chord middle part is suppressed. Further, by forming the chord end of the steel chord with an H-shaped steel with the strong axis direction being the vertical direction, the joining structure between the steel column and the chord end is simplified.

[0012] Thus, in the present invention, it is possible to simplify the joining structure between the steel chord and the steel column while suppressing lateral buckling of the steel chord.

[0013] The truss structure according to claim 2 is the truss structure according to claim 1, wherein the steel column has a pair of diaphragms facing each other in the vertical direction, and upper and lower flange portions of the chord end are welded to the pair of diaphragms respectively.

[0014] According to the truss structure according to claim 2, the steel column has a pair of diaphragms facing each other in the vertical direction. And upper and lower flange portions of the chord end are welded to the pair of diaphragms respectively.

[0015] Thus, by forming the chord end with an H-shaped steel with the strong axis direction being the vertical direction, upper and lower flange portions of the chord end can be welded to the pair of diaphragms of the steel column. Therefore, the joining structure between the steel chord and the steel column can be simplified.

[0016] The truss structure according to claim 3 is the truss structure according to claim 1 or claim 2, wherein the chord end and the chord middle part are joined via a joining plate.

[0017] According to the truss structure according to claim 3, the chord end and the chord middle part are joined via a joining plate. Thereby, while transmitting the axial force between the chord end and the chord middle part, the chord end and the chord middle part can be easily joined.

Advantages of the Invention

[0018] As described above, according to the present invention, it is possible to simplify the joining structure between the steel frame chord member and the steel frame column while suppressing the lateral buckling of the steel frame chord member.

Brief Description of the Drawings

[0019]

Figure 1

Figure 2

Figure 3

Figure 4

Modes for Carrying Out the Invention

[0020] Hereinafter, an embodiment will be described with reference to the drawings.

[0021] (Truss Structure) FIG. 1 shows a part of a truss structure 10 according to the present embodiment. The truss structure 10 constitutes, for example, the structure (building) of a structure. This truss structure 10 has a steel frame column 20 and a steel frame truss 30.

[0022] (Steel Frame Column) The steel column 20 is formed of a square steel pipe as an example and is arranged to face another steel column (not shown). Note that the steel column 20 is not limited to a square steel pipe and may be formed of, for example, a round steel pipe, an H-shaped steel, a cross H-shaped steel, or the like.

[0023] The steel column 20 has upper and lower connection parts 20S. The upper and lower connection parts 20S are arranged at intervals in the material axis direction (arrow Z direction) of the steel column 20. The upper and lower steel chords 40 of the steel truss 30 described later are joined to the upper and lower connection parts 20S, respectively. A gusset plate 22 and a pair of diaphragms 24 are provided at each connection part 20S.

[0024] The gusset plate 22 is formed of a steel plate or the like. This gusset plate 22 is arranged along the material axis direction of the steel column 20, and ribs are provided on the outer surface of the gusset plate 22. A pair of diaphragms 24 are provided above and below this gusset plate 22.

[0025] The pair of diaphragms 24 serve as reinforcing members for reinforcing (stiffening) the connection part 20S of the steel column 20. The pair of diaphragms 24 are arranged to face each other in the vertical direction. Further, the pair of diaphragms 24 are a continuous diaphragm as an example, and the outer peripheral part thereof projects outward from the steel column 20.

[0026] Note that the pair of diaphragms 24 are not limited to a continuous diaphragm and may be, for example, an outer diaphragm or an inner diaphragm.

[0027] (Steel truss) The steel truss 30 has upper and lower steel chords 40, a plurality of bundled members 32, and a plurality of diagonal members 34. The upper and lower steel chords 40 are installed between the steel column 20 and a steel column (not shown) at intervals in the vertical direction. A plurality of bundled members 32 and a plurality of diagonal members 34 are installed on the upper and lower steel chords 40.

[0028] The plurality of bundled members 32 are formed of, for example, shaped steel such as C-shaped steel. Each bundled member 32 is arranged along the vertical direction and is spaced apart in the material axis direction (arrow X direction) of the steel frame chord member 40. Further, the upper and lower ends of each bundled member 32 are respectively joined to the upper and lower steel frame chord members 40 via gusset plates 36.

[0029] The plurality of diagonal members 34 are formed of, for example, shaped steel such as C-shaped steel. Each diagonal member 34 is obliquely arranged between the steel frame column 20 and the bundled member 32 or between adjacent bundled members 32. The upper and lower ends of each diagonal member 34 are respectively joined to the upper and lower steel frame chord members 40 via gusset plates 36.

[0030] (Steel frame chord member) Next, the configuration of the upper and lower steel frame chord members 40 will be described in detail. The upper and lower steel frame chord members 40 have a chord member middle portion 42 and chord member end portions 44 on both sides.

[0031] Note that the configurations of the upper and lower steel frame chord members 40 are the same. Therefore, hereinafter, the configuration of the lower steel frame chord member 40 will be described in detail, and the description of the configuration of the upper steel frame chord member 40 will be omitted.

[0032] (Chord member middle portion) As shown in FIG. 2, the chord member middle portion 42 constitutes the middle portion in the material axis direction of the steel frame chord member 40. This chord member middle portion 42 is formed of H-shaped steel with the strong axis direction as the horizontal direction. In other words, the chord member middle portion 42 is formed of horizontally used H-shaped steel.

[0033] As shown in FIGS. 2 and 3, the chord member middle portion 42 has a pair of flange portions 42A and a web portion 42B. The pair of flange portions 42A face each other in the width direction (horizontal direction, arrow Y direction) of the steel frame chord member 40. The pair of flange portions 42A are connected by the web portion 42B.

[0034] The web portion 42B is arranged with the thickness direction as the vertical direction, and connects the central portions in the vertical direction of the pair of flange portions 42A. At both ends of the chord member intermediate portion 42, chord member end portions 44 are respectively joined via joining plates 50.

[0035] The joining plate 50 is formed of a steel plate or the like. As an example, the plate thickness of the joining plate 50 is made thicker than the plate thicknesses of the pair of flange portions 42A, 44A of the chord member intermediate portion 42 and the chord member end portion 44. Further, the joining plate 50 is arranged with the thickness direction as the material axis direction of the steel frame chord member 40. The end face of the chord member intermediate portion 42 is joined to the surface of this joining plate 50 in a butted state.

[0036] Specifically, on the surface of the joining plate 50, the end faces of the pair of flange portions 42A of the chord member intermediate portion 42 and the end face of the web portion 42B are welded in a butted state. Further, reinforcing ribs 42C are provided at the ends of the web portion 42B of the chord member intermediate portion 42.

[0037] The reinforcing ribs 42C are formed of a steel plate or the like. Further, the reinforcing ribs 42C are arranged along the material axis direction of the chord member intermediate portion 42, and are respectively provided in a rib shape on the upper and lower surfaces of the web portion 42B. The end faces of these reinforcing ribs 42C are welded in a butted state to the surface of the joining plate 50.

[0038] Note that the plate thickness of the joining plate 50 may be the same as the plate thicknesses of the pair of flange portions 42A, 44A of the chord member intermediate portion 42 and the chord member end portion 44, or may be thinner than the plate thicknesses of the flange portions 42A, 44A.

[0039] (Chord member end portion) The chord member end portion 44 constitutes the end portion in the material axis direction of the steel frame chord member 40. This chord member end portion 44 is formed of an H-shaped steel with the strong axis direction as the vertical direction. In other words, the chord member end portion 44 is formed of a vertically used H-shaped steel.

[0040] As shown in FIGS. 2 and 4, the chord end portion 44 has a pair of flange portions 44A and a web portion 44B. The pair of flange portions 44A face each other in the vertical direction of the steel chord 40. The pair of flange portions 44A are connected by the web portion 44B.

[0041] The web portion 44B is arranged with the thickness direction as the width direction (lateral direction) of the steel chord 40, and connects the central portions in the width direction of the pair of flange portions 44A. One end of the chord end portion 44 is joined to the chord intermediate portion 42 via a joining plate 50.

[0042] Specifically, the end faces of the pair of flange portions 44A of the chord end portion 44 and the end face of the web portion 44B are welded in a state of being abutted against the surface of the joining plate 50. In addition, a reinforcing rib 44C is provided at the end of the web portion 44B of the chord end portion 44.

[0043] The reinforcing rib 44C is formed of a steel plate or the like. The reinforcing rib 44C is arranged along the material axis direction of the chord end portion 44 and is provided in a rib shape on both side surfaces of the web portion 44B, respectively. The end faces of these reinforcing ribs 44C are welded in a state of being abutted against the surface of the joining plate 50.

[0044] As shown in FIG. 2, the other end of the chord end portion 44 is joined to the joint portion 20S of the steel column 20. Specifically, the end faces of the pair of flange portions 44A of the chord end portion 44 are joined by welding or the like in a state of being abutted against the end faces of a pair of diaphragms 24 provided in the joint portion 20S of the steel column 20.

[0045] In addition, the web portion 44B of the chord end portion 44 is bolted in a state of being overlapped with a gusset plate 36 provided in the joint portion 20S of the steel column 20. Thereby, both ends in the material axis direction of the chord intermediate portion 42 are joined to the steel column 20 via the chord end portion 44.

[0046] (Function) Next, the function of the present embodiment will be described.

[0047] As shown in FIG. 2, according to the present embodiment, the steel truss chord member 40 has a chord member intermediate portion 42 and a chord member end portion 44. The chord member end portion 44 is formed of an H-shaped steel with the strong axis direction being the vertical direction. Further, the chord member intermediate portion 42 is formed of an H-shaped steel with the strong axis direction being the horizontal direction, and is joined to the joint portion 20S of the steel column 20 via the chord member end portion 44.

[0048] Here, by forming the chord member intermediate portion 42 of the steel truss chord member 40 with an H-shaped steel having the strong axis direction as the horizontal direction, lateral buckling (buckling in the direction of arrow Y) of the chord member intermediate portion 42 is suppressed. Thereby, for example, a buckling bracing member or the like of the chord member intermediate portion 42 can be omitted. Therefore, cost reduction can be achieved.

[0049] Further, by forming the chord member end portion 44 of the steel truss chord member 40 with an H-shaped steel having the strong axis direction as the vertical direction, the joining structure between the joint portion 20S of the steel column 20 and the chord member end portion 44 is simplified. Therefore, for example, at the construction site, the chord member end portion 44 can be easily joined to the joint portion 20S of the steel column 20. Further, in the present embodiment, since it is not necessary to form the end portion of the steel truss chord member 40 in a bracket form, for example, the transportability and hoisting property of the steel column 20 are improved.

[0050] Thus, in the present embodiment, it is possible to simplify the joining structure between the steel truss chord member 40 and the steel column while suppressing the lateral buckling of the steel truss chord member 40.

[0051] Further, in the present embodiment, the joint portion 20S of the steel column 20 has a pair of diaphragms facing each other in the vertical direction. The upper and lower flange portions 44A of the chord member end portion 44 are welded to the pair of diaphragms 24.

[0052] By forming the chord member end portion 44 with an H-shaped steel having the strong axis direction as the vertical direction in this way, a joining structure of a general steel column 20 and a steel truss chord member 40 can be adopted. Therefore, the workability of the joint portion of the steel column 20 and the steel truss chord member 40 is improved.

[0053] In addition, in the present embodiment, the intermediate portion 42 of the chord member and the end portion 44 of the chord member are joined via a joining plate 50. Thereby, while transmitting the axial force between the intermediate portion 42 of the chord member and the end portion 44 of the chord member, the intermediate portion 42 of the chord member and the end portion 44 of the chord member can be easily joined.

[0054] Furthermore, a plurality of reinforcing ribs 42C are provided on the intermediate portion 42 of the chord member. The plurality of reinforcing ribs 42C are provided in a rib shape on the web portion 42B of the intermediate portion 42 of the chord member, and are welded in a state where their end faces are abutted against the surface of the joining plate 50. By reinforcing the intermediate portion 42 of the chord member with these reinforcing ribs 42C, the transmission efficiency of the axial force between the intermediate portion 42 of the chord member and the end portion 44 of the chord member is improved.

[0055] Similarly, a plurality of reinforcing ribs 44C are provided on the end portion 44 of the chord member. The plurality of reinforcing ribs 44C are provided in a rib shape on the web portion 44B of the end portion 44 of the chord member, and are welded in a state where their end faces are abutted against the surface of the joining plate 50. By reinforcing the end portion 44 of the chord member with these reinforcing ribs 44C, the transmission efficiency of the axial force between the intermediate portion 42 of the chord member and the end portion 44 of the chord member is improved.

[0056] (Modification example) Next, a modification example of the above embodiment will be described.

[0057] In the above embodiment, the intermediate portion 42 of the chord member and the end portion 44 of the chord member of the steel frame chord member 40 are joined via a joining plate 50. However, the intermediate portion 42 of the chord member and the end portion 44 of the chord member may be directly joined without using the joining plate 50, for example. Also, the joining structure between the intermediate portion 42 of the chord member and the end portion 44 of the chord member can be changed as appropriate.

[0058] Also, in the above embodiment, the end portion 44 of the steel frame chord member 40 is joined to the gusset plate 22 and the pair of diaphragms 24 provided at the joint portion 20S of the steel frame column 20. However, the joining structure between the steel frame column 20 and the end portion 44 of the steel frame chord member 40 can be changed as appropriate.

[0059] In addition, the steel truss 30 in the above embodiment may be, for example, a Howe truss, a Pratt truss, a Warren truss, or a Fink truss.

[0060] As described above, one embodiment of the present invention has been described. However, the present invention is not limited to such an embodiment, and one embodiment and various modifications may be appropriately combined and used. Of course, the present invention can be implemented in various modes without departing from the gist of the present invention.

Explanation of Reference Numerals

[0061] 10 Truss structure 20 Steel column 24 Diaphragm 40 Steel chord 42 Middle part of chord 44 Chord end 44A Flange part 50 Joint plate

Claims

1. Steel columns and A steel chord member having a chord end portion formed by an H-shaped steel with its strong axis direction being a vertical direction, and a chord middle portion formed by an H-shaped steel with its strong axis direction being a horizontal direction and joined to the steel column via the chord end portion; A truss structure comprising:

2. The steel column has a pair of diaphragms facing each other in the vertical direction, The upper and lower flange portions of the chord end are welded to the pair of diaphragms, respectively. The truss structure according to claim 1.

3. The chord end portion and the chord middle portion are joined via a joining plate. The truss structure according to claim 1 or 2.

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