Steel frame joint structure and steel frame structure

Abstract

The present invention provides a steel frame joint structure that does not generate stress that causes deformation or damage to the joint between the fixed structure and the steel beam, even if the steel beam expands or contracts due to temperature changes, or if the steel beam is displaced significantly in the horizontal direction during an earthquake. [Solution] A joining structure for joining one end of a horizontally arranged steel beam 12 to a fixed structure 6, comprising a first joining portion 13 provided on the fixed structure and a second joining portion 14 provided on one end of the steel beam, wherein the first joining portion allows displacement of one end of the steel beam in the longitudinal direction (X direction) and displacement in the horizontal direction (Y direction) perpendicular to the longitudinal direction of the steel beam, and supports the load of the steel beam and is joined to the second joining portion.

Description

Technical Field

[0005] , ,

[0001] The present invention relates to a steel frame joining structure and a steel frame structure for joining one end of a steel frame horizontally arranged with respect to a fixed structure.

Background Art

[0002] A planar and long steel frame structure is liable to be affected by temperature stress and temperature deformation associated with temperature changes between summer and winter. When the length direction of a steel frame structure exceeds 100 m, if the steel frame beam repeatedly expands and contracts with a large amount of expansion and contraction due to temperature changes, excessive stress is applied to the joint portion joining the steel frame beam and a fixed structure such as a steel frame column, and the joint portion may be deformed or damaged.

[0003] As a conventional steel frame joining structure, a structure in which one end of a steel frame beam is joined to a fixed structure via a deformation allowance plate is known (for example, Patent Document 1). When the steel frame joining structure of this Patent Document 1 is adopted for a planar and long steel frame structure, even if the steel frame beam repeatedly expands and contracts with a large amount of expansion and contraction due to temperature changes, the deformation allowance plate is bent and deformed in the longitudinal direction of the steel frame beam to absorb the expansion and contraction of the steel frame beam, so that deformation and damage of the joint portion can be prevented.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] When a planar and long steel frame structure is constructed with steel frame structures divided into a plurality of parts, the length of the steel frame beam of the divided steel frame structure becomes short, so that the amount of expansion and contraction of the steel frame beam due to temperature changes can be restricted. Incidentally, when a steel frame structure is divided into multiple sections, large displacements occur at the boundaries between the sections during an earthquake. If the steel frame joint structure described in Patent Document 1 is used at the joints at the boundaries of the divided steel frame structure, the deformation-allowing plate will absorb the longitudinal displacement of the steel beams during an earthquake. However, since the steel frame joint structure described in Patent Document 1 is rigidly connected in the direction perpendicular to the longitudinal direction of the steel beams, it cannot absorb displacement in the direction perpendicular to the longitudinal direction of the steel beams, and there is a risk of deformation or damage.

[0006] Therefore, the present invention has been made in view of the above circumstances, and aims to provide a steel joint structure and a steel structure that do not generate stress that causes deformation or damage to the joint between the fixed structure and the steel beam, even if the steel beam expands or contracts due to temperature changes, or if the steel beam is displaced significantly in the horizontal direction during an earthquake. [Means for solving the problem]

[0007] The steel frame joint structure according to the present invention is a joint structure for joining one end of a horizontally arranged steel beam to a fixed structure, comprising a first joint provided on the fixed structure and a second joint provided on one end of the steel beam, wherein the first joint allows longitudinal displacement of one end of the steel beam and horizontal displacement perpendicular to the longitudinal direction of the steel beam, and supports the load of the steel beam and is joined to the second joint. Furthermore, the steel frame structure according to the present invention has the steel frame joining structure described above. [Effects of the Invention]

[0008] According to the steel frame joint structure and steel frame structure of the present invention, deformation and damage to the joint between the fixed structure and the steel frame beam can be prevented even if the steel frame beam expands or contracts due to temperature changes, or if the steel frame beam is displaced significantly in the horizontal direction during an earthquake. [Brief explanation of the drawing]

[0009] [Figure 1] This is a schematic perspective view showing a long, planar steel frame structure according to the present invention. [Figure 2]This diagram shows the connection structure between the main beams and secondary beams at the boundary between the high roof section and the low roof section, which constitute a long, horizontal steel frame structure. [Figure 3] This is an enlarged view of the joint structure between a main beam and a secondary beam according to the first embodiment of the present invention. [Figure 4] This figure shows the connection structure between the main beam and the secondary beam in the first embodiment, viewed from the horizontal direction (X direction) where the secondary beam is positioned. [Figure 5] This figure shows the column-beam joint structure of the second embodiment of the present invention, viewed from the horizontal direction (Y direction). [Figure 6] This figure shows the column-beam joint structure of the second embodiment of the present invention, viewed from the vertical direction (Z direction). [Modes for carrying out the invention]

[0010] Next, embodiments of the present invention will be described with reference to the drawings. In the following drawings, identical or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic, and the relationship between thickness and planar dimensions, the ratio of the thickness of each layer, etc., may differ from reality. Therefore, specific thicknesses and dimensions should be determined by referring to the following explanation. Furthermore, it should be noted that there are parts where the relationships and ratios of dimensions differ between drawings.

[0011] Furthermore, the embodiments described below illustrate devices and methods for realizing the technical concept of the present invention, and the technical concept of the present invention does not limit the materials, shapes, structures, arrangements, etc. of the components to those described below. The technical concept of the present invention can be modified in various ways within the technical scope defined by the claims described in the patent claims. In Figures 1 to 5, the X and Y directions are mutually orthogonal and extend horizontally, while the Z direction is a vertical direction perpendicular to the horizontal plane containing the X and Y directions. Figure 1 shows a long, rectangular steel frame structure 1, which consists of a high roof section 2 and a low roof section 3. The length X1 in the longitudinal direction (X) of the steel frame structure 1 is approximately 300m, and the length X2 in the X direction of the high roof section 2 is approximately half the length X3 in the X direction of the low roof section 3. Furthermore, the length Y1 in the short direction (Y) of the steel frame structure 1 is approximately the same as the length X2 in the X direction of the high roof section 2.

[0012] [Steel frame joint structure of the first embodiment] Figure 2 is a schematic diagram showing the structure of the boundary 5 between the high roof section 2 and the low roof section 3 of the steel frame structure 1. The end of the main beam 7 of the high roof section 2, which extends in the X direction, is fixed to the upper end of the column 6 erected at the boundary section 5, and the end of the main beam 8 of the low roof section 3, which extends in the X direction, is fixed to the column 6 located below the main beam 7 of the high roof section 2. In addition, a main beam 10 extending in the Y direction is fixed to the column 6, and one end of a secondary beam 12 extending in the X direction is joined to this main beam 10 via a movable joint 11. The movable joint 11 consists of a first joint 13 fixed to the main beam 10 and a second joint 14 installed on the secondary beam 12. The column 6 and main beams 7, 8, and 10 are H-shaped steel of approximately the same size, and the secondary beam 12 is an H-shaped steel of a smaller size than the main beams 7, 8, and 10. Here, the fixed structure described in the present invention corresponds to the main beam 10, and the steel beam described in the present invention corresponds to the secondary beam 12.

[0013] As shown in Figures 3 and 4, the first joint 13 of the movable joint 11 includes a pair of guide plates 15, 15, a pair of elongated holes 16, 16, a support plate 17, and a support rib 18. A pair of guide plates 15, 15 are spaced apart from each other in the Y direction and extend parallel to the X direction, with one end fixed to the web 10a and lower flange 10b of the main beam 10. Elongated holes 16, 16 are formed in the pair of guide plates 15, 15 such that their long axes extend in the X direction. The support plate 17 is fixed to the lower side between the pair of guide plates 15, 15, and the lower flange 12b of the secondary beam 12 rests on the upper surface of the support plate 17. Here, the upper surface of the support plate 17 is provided with a sliding material made of polished stainless steel or Teflon® sheet, etc., which can reduce the coefficient of friction with the lower flange 12b of the secondary beam 12. Support ribs 18 are fixed to the lower part of the support plate 17, the web 10a and lower flange 10b of the main beam 10, and the load of the secondary beam 12 is supported by the main beam 10 via the support plate 17 and support ribs 18.

[0014] As shown in Figures 3 and 4, the second joint 14 of the movable joint 11 includes a guide pin 19 and a pair of pin stoppers 20, 20. The guide pin 19 extends in the Y direction through a guide hole 12c formed in the web 12a at one end of the beam 12, and is installed on the web 12a of the beam 12 so that the web 12a of the beam 12 can move in the Y direction along the guide pin 19. The guide pin 19 passes through the elongated holes 16, 16 of a pair of guide plates 15, 15. Here, a reinforcing plate 21 is fixed to the web 12a to reinforce the periphery of the guide hole 12c through which the guide pin 19 passes. The length of the guide pin 19 is set to be longer than the distance in the Y direction between the pair of elongated holes 16, 16. Furthermore, by fixing a pair of pin stoppers 20, 20 to both ends of the guide pin 19 that protrudes outward from the pair of guide plates 15, 15, the guide pin 19, which passes through the elongated holes 16, 16 of the pair of guide plates 15, 15, becomes movable in the X direction, and the pair of pin stoppers 20, 20 abut against the periphery of the pair of elongated holes 16, 16, thereby preventing the guide pin 19 from coming out of the pair of elongated holes 16, 16.

[0015] Next, the effects and advantages of the steel frame joint structure of the first embodiment will be described. When the temperature of the cross beam 12 rises due to solar radiation, an increase in temperature, etc., one end of the cross beam 12 extends in the longitudinal direction (X direction). A sliding material such as a stainless steel polishing plate or a Teflon sheet is provided on the upper surface of the support plate 17 on which the lower flange 12b of the cross beam 12 is placed at the first joint portion 13 of the movable joint 11. Since the friction coefficient between the support plate 17 and the lower flange 12b is reduced, the resistance force when the cross beam 12 extends is suppressed. Then, the movable joint 11 absorbs the elongation deformation of the cross beam 12 as the guide pin 19 fixed to the cross beam 12 moves along the long axes of the long holes 16, 16 of the pair of guide plates 15, 15. Even when the cross beam 12 contracts in cold weather or the like, the contraction deformation of the cross beam 12 is absorbed as the guide pin 19 fixed to the cross beam 12 moves in the opposite direction along the long axes of the pair of long holes 16, 16.

[0016] Also, when an earthquake occurs, a relative displacement occurs horizontally at the boundary portion 5 between the high roof portion 2 and the low roof portion 3. As described above, the displacement of the cross beam 12 in the X direction is not restricted, and the cross beam 12 is capable of displacement in the X direction until the guide pin 19 abuts against the peripheral edges in the long axis direction of the pair of long holes 16, 16. Also, the web 12a of the cross beam 12 and the guide pin 19 are not restricted in displacement in the Y direction by the guide holes 12c formed in the cross beam 12, and the cross beam 12 is capable of displacement in the Y direction until the lower flange 12b of the cross beam 12 abuts against the inner surfaces of the pair of guide plates 15, 15. For this reason, no stress due to the occurrence of an earthquake is generated in the movable joint 11 (the first joint portion 13, the second joint portion 14) connecting the main beam 10 and the cross beam 12. Therefore, the steel frame joint structure of the first embodiment can prevent fatigue fracture when repeated stress acts due to thermal expansion and contraction on the movable joint 11 connecting the main beam 10 and the cross beam 12, and can prevent breakage when excessive stress acts due to the occurrence of an earthquake.

[0017] In addition, the downward load in the Z direction acting on the secondary beam 12 is supported by a support plate 17 fixed to the main beam 10 via a support rib 18, and the upward load in the Z direction acting on the secondary beam 12 is supported by a guide pin 19 installed on the secondary beam 12 passing through the long holes 16 of a pair of guide plates 15, 15. With this structure, there is no risk that the secondary beam 12 will disengage from the movable joint 11 due to external forces that cause the secondary beam 12 to be displaced upward and downward in the Z direction due to deformation of the high roof portion 2 where the secondary beam 12 is arranged. Also, even when a load such as the suspended load of a crane acts on the secondary beam 12, since the main beam 10 firmly supports it via the support plate 17 and the support rib 18, the secondary beam 12 can be used as a loading beam.

[0018] In addition, since the guide pin 19 installed on one end side of the secondary beam 12 passes through the long holes 16 of a pair of guide plates 15, 15 fixed to the main beam 10 and the guide holes 12c formed in the web 12a of the secondary beam 12, the secondary beam 12 is joined to the main beam 10 by a pin structure, and no bending moment acts on one end side of the secondary beam 12. As a result, no bending moment acts on the main beam 10 from the movable joint 11 either, and the generation of excessive stress due to the bending moment can be prevented. Therefore, in the steel frame structure 1, economical and safe structural members can be adopted at the design stage.

[0019] [Steel Frame Joint Structure of the Second Embodiment] Next, FIGS. 5 and 6 show the steel frame joint structure of the second embodiment provided at the boundary portion 5 between the high roof portion 2 and the low roof portion 3 of the steel frame structure 1 shown in FIG. 2. One end of a secondary beam 27 extending in the X direction is joined via a movable joint 26 to a position at a predetermined height of a column 25 standing at the boundary portion 5. The movable joint 26 is composed of a first joint portion 28 fixed to the column 25 and a second joint portion 29 installed on the secondary beam 27. The column 25 is an H-shaped steel, and the secondary beam 27 is an H-shaped steel with a smaller size than the column 25. Here, the fixed structure described in the present invention corresponds to the column 25, and the steel frame beam described in the present invention corresponds to the secondary beam 27.

[0020] The first joint portion 28 of the movable joint 26 includes a pair of guide plates 30, 30, a pair of elongated holes 31, 31, a support plate 32, and a support rib 33. A pair of guide plates 30, 30 are spaced apart from each other in the Y direction and extend parallel to the X direction, with one end fixed to the first flange 25a of the column 25. Elongated holes 31, 31 are formed in the pair of guide plates 30, 30 such that their long axes extend in the X direction. The support plate 32 is fixed to the underside of a pair of guide plates 30, 30, and the lower flange 27b of the beam 27 rests on the upper surface of the support plate 32. Here, a sliding material is provided on the upper surface of the support plate 32 that can reduce the coefficient of friction with the lower flange 27b of the beam 27. In addition, a support rib 33 is fixed to the lower part of the support plate 32 and to the first flange 25a of the column 25, and the load of the beam 27 is supported by the column 25 via the support plate 32 and the support rib 33.

[0021] The second joint 29 of the movable joint 26 includes a guide pin 34 and a pair of pin stoppers 35, 35. The guide pin 34 extends in the Y direction through a guide hole 27c formed in the web 27a at one end of the beam 27, and is positioned so that the web 27a of the beam 27 can slide in the Y direction along the guide pin 34. The guide pin 34 passes through the elongated holes 31, 31 of a pair of guide plates 30, 30. The length of the guide pin 34 is set to be longer than the distance between the pair of elongated holes 31, 31 in the Y direction. Furthermore, by fixing a pair of pin stoppers 35, 35 to both ends of the guide pin 34 that protrudes outward from the pair of guide plates 30, 30, the guide pin 19 that passes through the elongated holes 31, 31 of the pair of guide plates 30, 30 becomes movable in the X direction, and the pair of pin stoppers 35, 35 abut against the periphery of the pair of elongated holes 31, 31, preventing the guide pin 34 from coming out of the pair of elongated holes 31, 31.

[0022] Next, the effects and advantages of the steel frame joint structure of the second embodiment will be described. When the temperature of the beam 27 rises due to sunlight or rising air temperature, one end of the beam 27 extends in the longitudinal direction (X direction). The first joint 28 of the movable joint 26 has a sliding material provided on the upper surface of the support plate 32 on which the lower flange 27b of the beam 27 rests, so that the coefficient of friction between the support plate 32 and the lower flange 27b is reduced, thereby suppressing the resistance force when the beam 27 extends. The movable joint 26 absorbs the elongation deformation of the beam 27 by having a guide pin 34 fixed to the beam 27 move along the long axis of the elongated holes 31, 31 of the pair of guide plates 30, 30. Furthermore, even when the beam 27 contracts in cold weather, the contraction deformation of the beam 27 is absorbed by having the guide pin 34 fixed to the beam 27 move in the opposite direction along the long axis of the pair of elongated holes 31, 31.

[0023] Furthermore, when an earthquake occurs and relative horizontal displacement occurs at the boundary 5 between the high roof section 2 and the low roof section 3, the joist 27 is not constrained in the X direction, and is allowed to move in the X direction until the guide pin 34 contacts the peripheral edge in the longitudinal direction of the pair of elongated holes 31, 31. Also, the web 27a of the joist 27 and the guide pin 34 are not constrained in the Y direction by the guide hole 27c formed in the joist 27, and is allowed to move in the Y direction until the lower flange 27b of the joist 27 contacts the inner surface of the pair of guide plates 30, 30. As a result, no stress is generated in the movable joint 26 (first joint 28, second joint 29) connecting the column 25 and the joist 27 due to the occurrence of an earthquake. Therefore, the steel frame joint structure of the second embodiment can prevent fatigue failure when repeated stress is applied to the movable joint 26 connecting the column 25 and the joist 27 due to thermal expansion and contraction, and can prevent damage when excessive stress is applied due to the occurrence of an earthquake.

[0024] Furthermore, downward loads in the Z direction acting on the beam 27 are supported by support plates 32 fixed to the column 25 via support ribs 33, and upward loads in the Z direction acting on the beam 27 are supported by guide pins 34 installed on the beam 27 that pass through elongated holes 31 in a pair of guide plates 30, 30. With this structure, there is no risk of the beam 27 detaching from the movable joint 26 due to external forces that displace the beam 27 upward and downward in the Z direction, such as deformation of the high roof section 2 on which the beam 27 is located. In addition, even when loads such as crane loads act on the beam 27, the column 25 firmly supports it via the support plates 32 and support ribs 33, so the beam 27 can be used as a load-bearing beam.

[0025] Furthermore, since the guide pin 34 fixed to one end of the secondary beam 27 penetrates the elongated holes 31 of the pair of guide plates 30, 30 fixed to the column 25 and the guide hole 27c formed in the web 27a of the secondary beam 27, the secondary beam 27 is connected to the column 25 in a pin structure, and no bending moment acts on one end of the secondary beam 27. As a result, the steel frame structure 1 can employ economical and safe components at the design stage.

[0026] In the first embodiment, the steel frame connection structure is a structure in which the main beam 10 and the secondary beam 12 are connected by a movable joint 11, and in the second embodiment, the steel frame connection structure is a structure in which the column 25 and the secondary beam 27 are connected by a movable joint 26. However, the steel frame connection structure of the present invention is not limited to these, and similar effects can be achieved by adopting, for example, a structure in which the corners of the column and main beam and the secondary beam are connected by a movable joint, or a structure in which the intersection of the column and main beam and the secondary beam are connected by a movable joint. [Explanation of Symbols]

[0027] 1. Steel frame structure 2. High roof section 3. Low roof section 5. Boundary 6,25 pillars 7 girder 8 girder 10 girder 10a Web 10b Lower flange 11,26 Movable joint 12, 27 small beam 12a,27a Web 12b, 27b Lower flange 12c, 27c guide holes 13,28 1st joint 14,29 Second joint 15,30 Guide plate 16,31 long hole 17,32 Support plate 18,33 Support Ribs 19,34 Guide pins 20,35 Pin stopper 21 Reinforcement plate

Claims

1. A joining structure for connecting one end of a horizontally positioned steel beam to a fixed structure, It comprises a first joint provided on the fixed structure and a second joint provided on one end of the steel beam, A steel frame joint structure characterized in that the first joint allows longitudinal displacement of one end of the steel beam and horizontal displacement perpendicular to the longitudinal direction of the steel beam, and is joined to the second joint while supporting the load of the steel beam.

2. The first joint comprises a pair of guide plates fixed to the fixed structure, extending horizontally from both sides of the steel beam, and elongated holes formed in the pair of guide plates, with their long axes extending horizontally. The steel frame joint structure according to claim 1, characterized in that the second joint portion comprises a guide pin that penetrates a guide hole formed on one end of the steel beam and extends in a direction perpendicular to the longitudinal direction of the steel beam, and penetrates the elongated holes formed in the pair of guide plates, and pin stoppers fixed to both ends of the guide pin that restrict the guide pin from coming out of the elongated holes due to displacement in a direction perpendicular to the longitudinal direction of the steel beam.

3. The steel frame joint structure according to claim 2, characterized in that the first joint portion has a support plate fixed to the fixed structure on which the lower part of one end of the steel beam rests and supports the load of the steel beam.

4. The steel frame joint structure according to claim 3, characterized in that a sliding material is provided on the surface of the support plate on which the steel beam is placed.

5. The support plate is fixed to the lower part of the pair of guide plates, The steel frame joint structure according to claim 3 or 4, characterized in that the lower part of the support plate is provided with support ribs that are fixed to the lower surface of the support plate and the fixing structure and receive the load acting on the support plate.

6. The steel frame joint structure according to any one of claims 1 to 4, characterized in that the fixed structure is one of a steel column, a steel main beam, and the joint between the steel beam and the steel main beam, and the steel beam is a steel secondary beam.

7. A steel frame structure having the steel frame joining structure described in any one of claims 1 to 4.

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