JP4688238B1 - Box-shaped metal wall plate with square tube reinforcement - Google Patents

Abstract

The present invention relates to a box-shaped metal wall plate that is subjected to in-plane shear and supports a compressive load as needed, to secure a yield shear load on the metal wall plate whose front and back metal flat plates are thin and to progress shear deformation after yielding. In order to maintain stable shear strength.
A perspective view of a typical reinforcing structure of the present invention in which a box-shaped metal wall plate is formed of a rectangular tubular member is shown, but a rectangular tubular member 2 is arranged in layers at regular intervals in the longitudinal direction of the wall plate. A metal plate 1 is attached to both front and back surfaces of the frame and reinforced with a peripheral frame 4 to form a box-shaped metal wall plate, and the inner reinforcing material is a rectangular tubular member. In addition to the box-shaped wall plate, it is determined by the front and back metal flat plates by overlapping the closed cross section and greatly increasing the torsional rigidity and suppressing the added strength by the above-mentioned framework accompanying the progress of shear deformation of the metal wall plate. The yield shear load is stably maintained, and the axial compression force applied to the box-shaped metal wall plate is supported by a rectangular tubular member inside the wall plate as necessary.
[Selection] Figure 1

Description

  The present invention is a reinforcing structure of a box-shaped metal wall plate that receives in-plane shear and supports a compressive load as necessary, and includes all or a part of various structural walls of metal-based buildings and shear panels for vibration suppression or earthquake resistance. It is a structured body. A box-shaped metal wall plate with a closed cross-section can greatly increase torsional rigidity, that is, shear rigidity, and by inserting and configuring a thin rectangular tube member inside, the mechanical effect is doubled, and it is thin and lightweight. It becomes a metal wall board.

  The metal wall plate subjected to shear force maintains shear strength in the process of shear deformation after shear yielding even if the shear buckling load exceeds the shear yield load, and is stable against repeated shear load. Therefore, it is necessary to reduce the width-thickness ratio of the flat plate subjected to the shearing force. As a result, a large number of stiffeners are arranged in a lattice shape to subdivide and reinforce the entire area of the flat plate. This has been the typical method so far.

  In order to secure the yield shear load of the metal wall plate and maintain the shear strength after yielding, the thickness of the metal plate is increased by using a material with a lower yield point stress than the shear strength required by the design. There is a method to avoid early shear buckling and increase the plastic deformation ability after yielding. In addition to this, various proposals have been made such as those in which shear panels are corrugated or folded for the purpose of vibration suppression or earthquake resistance, and those in which the method of joining the wall plate and the building part is devised.

Japanese Patent Laid-Open No. 2006-037586 Japanese Patent Laid-Open No. 2006-342622 JP 2008-008364 A Patent Publication JP2009-161984 Published Patent Gazette JP 2009-293254 A Patent Publication

Tomomi Kihara / Shingo Torii “Design of damping structure using steel plate wall with extremely low yield point” Architectural Technology November 1998 Toshio Suzuki “Shear stiffness mainly composed of torsional stiffness and shear buckling of flat plate” Architectural Institute of Japan, September 2008

  The problem to be solved is a powerful method to ensure the yield shear load of the front and back metal plates by significantly increasing the shear rigidity of the box-shaped metal wall plate that receives in-plane shear and supports the compressive load as necessary. Although it is a structure, in order to further reduce the plastic shear load determined by the front and back metal flat plates, that is, to reduce the plate thickness, the reinforcing material disposed inside the box-shaped metal wall plate does not affect the yield shear load. There is a need.

  For a box-shaped metal wall plate that receives in-plane shear and supports a compressive load as necessary, the inner structural member of the wall plate that has a closed cross section buckles and stiffens the front and back metal plates and increases the rigidity of the entire wall plate. In addition, in order to lower the strength added by the inner structural member as the shear deformation progresses and to suppress the increase in yield strength after yielding, all the structural members inside the metal wall plate are made of thin plates in principle. A rectangular tubular member.

FIG. 2A is a perspective view when a rectangular tubular member (hereinafter referred to as a square tube member) is twisted, and the product of the distance between the shear stress flowing through the flat plate and the torsion center corresponds to the torsion force, and the square tube. The torsional strength of the member is determined by the outline dimensions of the cross section, and is an extremely large value compared to the torsional strength of a rectangular flat plate whose center line is the torsion center. (b) from the position shear force Q to the rectangular angle pipe member away from it ie sectional act as shown in FIG. it is the same as that acts twisting force M _T, Plates under in-plane shear of the torsional dynamics This is also the structural advantage of being a box-like metal wall plate.

  Formula (1) is a plastic torsion load of a square tube member having a square cross section, and Formula (2) for comparison is a plastic torsion load of one plate element constituting the cross section. The plastic torsional load ratio of the square tube member to the four constituent plate elements is expressed by Equation (3), and it can be seen that the plastic torsional load of the cross section of the square square tube is approximately twice as large as the numerical value of the plate element width / thickness ratio. . If the cross section of the square tube has the same external dimensions, the plastic torsional load increases proportionally as the width-thickness ratio of the component plate elements increases, and it is possible to pursue mechanical stability even for extremely thin plate thicknesses. Become.

Figure 3 shows almost all square tube cross-sections from the construction steel material list, and the ratio of the plastic torsional load Q _y / q _y between the square tube members and the component plate elements is plotted vertically with the width-thickness ratio B / t of the cross-section plate elements as the horizontal axis. It is shown on the axis. The ● mark distributed in an oblique straight line is for a square cross section, and the numerical value approximately 2.0 times the plate element width / thickness ratio corresponds to the plastic torsional load as indicated by ← from the ↑ on the x-axis to the y-axis connected by the dotted line . The circle indicates that the numerical value of about 1.5 times is dispersed in the relation between the long side width-thickness ratio of the arbitrary rectangular cross section and the plastic torsional load.

FIG. 4 shows the results of numerical analysis showing the relationship between the shear load and the shear deformation angle when the shear load is applied to the rectangular tube member and when the shear load is applied to the rectangular cross-section member. The vertical axis represents the shear stress ratio τ / τ _y , and the horizontal axis represents the dimensionless amount of the shear deformation angle ratio γ / γ _y . The rectangular rectangular tube member subjected to shearing has three curves shown by solid lines. From left to right, the square tube thickness is 6mm, 9mm, 12mm, and the width-thickness ratio is 50, 33, 25. The plastic deformation capacity is substantially the same as in the case of the rectangular cross-section plate thicknesses of 36 mm, 54 mm, and 72 mm shown in FIG.

  The reinforcing structure of the metal wall plate of the present invention is intended to secure and stably maintain the yield shear load even when the front and back metal flat plates are thin plates, and the metal wall plate is shaped like a box and has a rectangular tube member inside. The front and back metal plates are made by inserting a closed cross section that is strong against torsion into the entire flat plate and the inner reinforcing material in an overlapping manner to greatly increase the torsional rigidity and making the internal reinforcing material a thin square tube member. The strength addition to the yield shear load determined by can be minimized.

It is a perspective view which shows the structure which arranges a square tube in parallel inside a box-shaped metal wall board. It is a force action figure of the twist and shear of a square tube member explaining the fundamental dynamic concept. It is a correlation diagram of the width thickness ratio of the plate element which comprises a square tube cross section, and a plastic torsion load. It is a plastic shear deformation | transformation figure which compares and shows a rectangular tube member and a solid cross-section member. It is a structural diagram of a typical box-shaped metal wall plate reinforced with a rectangular tube member. Example 1 It is an analysis result figure regarding the box-shaped metal wall board from which the plate | board thickness of a front and back metal flat plate differs. It is a structural diagram of the box-shaped metal wall board with respect to a thin front and back metal flat plate. (Example 2) It is an analysis result figure about the yield shear load ensuring decided by the front and back metal plates. It is a reinforcement figure of the inner side part and outer side surface of a rectangular box-shaped metal wall board. (Example 3) It is a cross-sectional detail drawing which shows the structure of the inner side square tube member corresponding to the length in a long side direction. It is an analysis result figure regarding the plastic deformation of the box-shaped metal wall board according to a square tube section. It is an analysis result figure of the rectangular box-shaped metal wall board which receives a shear under fixed axial force. It is a perspective view which shows the deformation | transformation accompanying the twist of the rectangular box-shaped metal wall board of this invention. It is a cross-sectional structure and explanatory drawing which show the plate | board thickness change of the front and back metal flat plate by which the reinforcement was carried out. It is a perspective view which shows the simple assembly-type wall board by the front and back metal flat plate by which separation reinforcement was carried out.

  FIG. 1 is a perspective view showing a typical structure of the present invention. It is a framework in which square tube members 2 are arranged in parallel at regular intervals over substantially the entire length of the wall plate. The metal plate 1 is attached to both the front and back surfaces of the framework as an intermediate layer, and a U-shaped frame 4 is covered. The box-shaped metal wall plate is constructed, and the torsional rigidity is greatly increased by incorporating the closed section in an overlapping manner, and the strength addition from the square tube member is kept low to stably maintain the yield shear strength. Further, when a compressive load is applied to the wall surface, it is an anisotropic structure in which a plurality of rectangular tube members constituting the inside bear the burden.

  As a rectangular metal wall plate that receives in-plane shear and supports a compressive load as necessary, a rectangular tube member is arranged in parallel in the longitudinal direction of the flat plate, so that the portion where the member is attached and the other portion are substantially Since the shear yield region is limited to a strip-like region with a thin plate thickness at the initial stage of yielding after the plate thickness difference is born, the elastic shear buckling load of the strip-like region is not reduced below the yield shear load. The width-to-thickness ratio in the hand direction is set, and even a metal wall plate composed of thin front and back metal flat plates is left in a layered area to have stable elastic-plastic mechanical properties.

  FIG. 5 shows the basic structure of the box-shaped metal wall plate of the present invention. FIG. 5 (a) shows the arrangement of the square tube members 2 constituting the inner side of the metal wall plate that is a multilayer, and FIG. The shear strain distribution of the front and back metal flat plates 1 subjected to in-plane shear, that is, the state in which the oblique tension proceeds, is schematically shown. The square tube members constituting the intermediate layer are arranged in parallel over substantially the entire length in the longitudinal direction, and the upper and lower ends of the box-shaped metal wall plate sandwich the front and back metal flat plates from the outside in order to protect and reinforce the applied portion. A U-shaped frame 4 is provided.

In this example, a box-shaped metal wall plate of 2,250 mm x 900 mm is composed of 5 pieces with a square tube cross-section of 100 mm x 50 mm x 3.2 mm arranged at 100 mm intervals over the width of 900 mm on the short side of the wall plate. The plate thickness is selected from 1.6 mm, 1.9 mm, 2.3 mm, 3.2 mm, 4.5 mm, and 6.0 mm, but all the square tube members have the same cross section with a thickness of 3.2 mm. In this numerical analysis, the yield stress is σ _y = 30 kN / cm ² and mild steel equivalent to SS400, and the following analysis is performed in accordance with this.

FIG. 6 is a relational diagram showing all nonlinear analysis results with different plate thicknesses, the ratio of the yield shear load Q _y and the shear deformation δ as the ratio of the wall plate length H. The feature of this result is that the plastic deformation ability after yielding is substantially the same even if reinforcement is performed by the same square tube member, although the plate thickness, that is, the shear strength, of the front and back metal flat plates is greatly different. Wall plates with a width-thickness ratio of 62.5 to 43.5 in the strip-shaped region sandwiched between parallel square tube members have a gradual decrease in yield strength as shown by the three solid lines, whereas a width-thickness ratio of 31.3 As shown by the three dotted lines, the proof stress of ˜16.7 is steep.

  FIG. 7 is a case where the front and back metal flat plates 1 are further thinned with respect to the box-shaped metal wall plate of the present invention. FIG. 7A is a diagram in which square tube members 2 constituting the inner side of the metal wall plate are arranged at a small interval. This is a structure in which square tube members 3 are arranged at the upper and lower ends of the wall plate to harden the peripheral portion. (B) The figure schematically shows the state of the shear stress and distortion of the front and back metal plates of the box-shaped metal wall plate that undergoes in-plane shearing. The frame 4 is reinforced. This is effective when the front and back metal flat plates are thin and the inner square tube member plate is thin.

  As an analysis example, a square tube cross section of 100 mm x 50 mm x 1.6 mm is placed 60 mm wide across the entire width of 900 mm on a 2,250 mm x 900 mm box-shaped metal wall plate, and square tube members are also placed on the upper and lower sides of the flat plate and This structure corresponds to the case where the front and back metal flat plates are provided with a slight gap so as not to inhibit the progress of shear deformation. The thicknesses of the front and back metal flat plates are 0.3 mm, 0.4 mm, 0.6 mm, 0.8 mm, 1.0 mm, and 1.2 mm. All the square tube members have the same cross section with a thickness of 1.6 mm, and the outer frame material on the longitudinal side is the plate. It is a strip-like flat plate with a thickness of 100mmx6mm, and is attached to the inner square tube member on the side.

   FIG. 8 shows a nonlinear analysis result for a thin plate thickness, which corresponds to an increase in the number of square tube members and a reduction in the square tube cross-sectional plate thickness. However, the shear yield load determined by the front and back metal plates is secured and the plasticity after yielding The deformation capacity is the same as or higher than that of the plank. When the width-thickness ratio in the short-side direction of the strip-shaped region sandwiched between the parallel square tube members is 160-50, the yield shear strength is maintained as shown by the four solid lines, and in the case of the width-thickness ratio 150-200 As shown by the two dotted lines, the shear yield strength is maintained, although the shear yield load is slightly reduced.

  Fig. 9 verifies the mechanical properties of the box-shaped metal wall plate when the transverse width is 900mm and the longitudinal length is 3,600mm, 3,000mm, 2,250mm and subjected to in-plane shear. (A) The figure shows the arrangement of the square tube members on the inner side of the wall plate. The upper and lower end portions of the wall plate, which is the position where the shear load is applied, are slightly shorter than the square tube member 2 in the longitudinal direction. The force jig 3 having a square tube cross section is installed in the hand direction. (B) The figure shows the reinforcement of the front and back metal flat plate 1 and the outer surface of the rectangular metal wall plate, and the strip-shaped flat plate 5 is attached to both sides in the longitudinal direction so that the out-of-plane deformation on both sides of the wall plate is free.

FIG. 10 is a detailed cross-sectional view of a box-shaped metal wall plate, which is a square tube member 2 having a cross section of 100 mm × 100 mm × 3.2 mm, 100 mm × 75 mm × 3.2 mm, 100 mm × 50 mm × 3.2 mm from top to bottom depending on the length of the flat plate. Each plate thickness of the front and back metal flat plate 1 is 3.2 mm, and the yield shear load determined by the two flat plates is approximately Q _y = 900 kN / cm ² . The strip-shaped flat plate 5 having a cross section of 100 mm × 6 mm, which is attached to the longitudinal side edges of the front and back metal flat plates, is reinforced by fillet welding, and the flat plate and each of the reinforcing members arranged inside are mainly bolted with metal adhesive. Is considered as a deputy.

  FIG. 11 shows the result of nonlinear analysis of a rectangular box-shaped metal wall plate, in which the vertical axis indicates the shear load Q and the horizontal axis indicates the shear deformation angle δ / H. The length H is 2,250mm, 3,000mm, 3,600mm and the ratio is 0.75: 1.0: 1.2 with respect to the width of 900mm in the short side direction of the wallboard, and the ratio of the cross section width in the direction of wallboard thickness is 0.67: 1.0: The ratio is 1.33. The load deformation relationship after shear yielding is almost the same, and the process from the maximum load point to the decrease in yield strength is similar. The dotted line at the bottom of the figure is the bending deformation to the outside of the wall plate surface, but the deformation at the center of the box-shaped metal wall plate is less than 1/2 at the time of maximum load in comparison with the total thickness T of the wall plate.

  Fig. 12 shows an example of analysis when a certain in-plane axial force is applied from the upper and lower ends of the box-shaped metal wall plate. The axial force P = 50ton is indicated by a solid line, and the axial force P = 100ton is indicated by a dotted line. ing. There is almost no difference compared to the case without the axial force described above. The former of the set axial force corresponds to 35%, 30%, 26% of the yield axial force converted by the total cross-sectional area of the square tube reinforcement, and the latter is twice the above value and averages about 60%. The inner square tube member functions effectively to support the box-shaped metal wall plate even when a compression axial force acts on it.

  FIG. 13 is a perspective view showing the deformation of the entire wall plate in the large deformation region by the analysis simulation of the box-shaped metal wall plate of the present invention. The shear force is applied in the horizontal direction along the upper and lower sides of the wall plate and the wall plate is Twisting is in the same dynamic system, which can be seen from the fact that the entire wall plate is bent and twisted. The square tube member that forms the inside of the wall plate does not bear any force other than contributing to the torsional rigidity and torsional strength of the wall plate, and functions as a member that supports the compressive load acting on the metal wall plate surface. In addition, it is possible to deal with without restraining out-of-plane deformation on both sides in the long side direction.

  Shear buckling of a semi-infinite edge flat plate A plate strip whose elastic shear buckling stress is the yield shear stress with the elastic shear buckling stress of Equation (4) as the buckling coefficient k = 8.98. The width / thickness ratio in the short side direction of the region is shown in Equation (5). Considering that plasticization proceeds at the start of shear yielding in a long and narrow strip region sandwiched between square tube members, the above condition must be satisfied when rectangular metal wall plates are subjected to in-plane shear. The width-thickness ratio in the short side direction of the flat plate-like region will be one guide for design.

FIG. 14 (a) shows the arrangement of the box-shaped metal wall plate and the square tube member constituting the inside, and FIG. 14 (b) is an enlarged cross-sectional view showing the plate thickness change of the front and back metal flat plates, which become thin plates in layers. The thickness t of the front and back metal flat plates and t + t ′ including the square tube cross-sectional thickness are 1.5 to 3.5 times. Yield stress of σ _y = 30kN / cm ² as a steel material, Young's modulus is E = 20,500kN / cm ^2, yield stress as a light metal material of σ _y = 20kN / cm ^2, Young's modulus is E = 7,200kN / cm ² Therefore, the standard width-thickness ratio is about b / t = 100 for steel materials and about b / t = 70 for light metal materials.

  The typical structure of the present invention is shown in the perspective view of FIG. 1, and is mainly composed of front and back metal flat plates that are subject to in-plane shear and square tube members arranged at substantially equal intervals inside the metal flat plates. The square tube member and the square tube member are integrated by metal adhesive or fillet welding as a standard, but spot welding or screwing may be used together. The method of assembling the tubular metal flat plate by reinforcing the rectangular tube member is relatively simple and the entire wall plate is lightweight, and the ease of design and the ease of manufacture are notable advantages.

  The present invention is a reinforcing structure of a box-shaped metal wall plate having a closed cross section, and solving the problem in constructing and manufacturing this is an indispensable problem for practical use. FIG. 15 shows a box-shaped metal wall plate by a simple assembling method, in which two sets of wall plate elements having the same configuration are overlapped so that the peripheral frame member and the internal reinforcing material face each other and form a pseudo closed cross section. Assemble the wallboard. According to this construction method, a majority of the mechanical performance required for each of the front and back metal wall plates is secured in advance, so that when the layers are stacked to form a multilayer, the joint between the peripheral frame and the flat plate is limited. Allowed at multiple locations.

  The present invention proposes a reinforcement structure for a box-shaped metal wall plate that receives in-plane shear and supports a compressive load as necessary. As a mechanical countermeasure mainly based on torsion, a box-shaped wall plate is used and an internal reinforcement is further provided. The square tube member is built in with a closed cross section, and the torsional rigidity, that is, shear rigidity, of the wall plate is greatly increased, and the addition of strength by the internal reinforcing material is suppressed to reduce the thickness of the front and back metal plates, thereby reducing the weight. As a box-shaped metal wall plate, it can be used for a wide variety of applications such as wall panels for metal buildings and structural wall plates for vibration control or earthquake resistance.

DESCRIPTION OF SYMBOLS 1 Metal flat plate which receives in-plane shear 2 The rectangular tubular member parallel to a long side direction 3 The rectangular tubular member along a short side side 4 A U-shaped reinforcement which protects a wall-plate periphery 5 Along a long side direction both sides Strip

Claims (4)

  As a box-shaped metal wall plate that receives in-plane shear and supports a compressive load as necessary, it is a framework in which rectangular tubular members are arranged in parallel at regular intervals over the entire length of the wall plate in the longitudinal direction. It consists of a metal flat plate attached to both sides, and the wall plate has a closed cross section made up of a front and back metal flat plate and both sides of the rectangular tubular member, thereby increasing the torsional rigidity of the entire wall plate and configuring the wall plate. Damping or seismic structure wall plate that secures the yield shear load determined by the front and back metal plates and improves the plastic deformation capacity.   As a box-shaped metal wall plate that receives in-plane shear and supports a compressive load as necessary, square tubular members are arranged in parallel at regular intervals in the longitudinal direction of the wall plate and perpendicular to the members in the short side direction at both ends of the wall plate. It is a framework in which a rectangular tubular member is arranged, and is constructed by attaching a metal flat plate to both the front and back surfaces of the framework as an intermediate layer, surrounding the peripheral portion of the box-shaped metal wall plate with a rectangular tubular member, A damping or seismic structure wall plate that secures the yield shear load determined by the front and back metal plates and improves the plastic deformation capacity.   As a box-shaped metal wall plate that receives in-plane shear and supports a compressive load as necessary, it constitutes two sets of wall plate elements in which the same rectangular tubular members are arranged in the longitudinal direction for each metal plate on the front and back of the wall plate. In addition, the metal flat plate of each other is used as the outer surface, the surfaces to which the rectangular tubular members are attached are overlapped face to face, joined at the peripheral side portions, and joined at a plurality of locations inside the wall plate to form a closed cross section, A vibration-damping or earthquake-resistant structural wall plate for securing a yield shear load determined by the front and back metal flat plates constituting the wall plate and improving plastic deformation ability.   As a box-shaped metal wall plate that receives in-plane shear and supports a compressive load as necessary, a U-shaped cross-section member is placed along the side of the wall plate or along the four sides of the wall plate and on the side of the wall plate. , Or by attaching strips in the thickness direction inside the front and back metal plates, or by attaching the strips with wide surfaces from both sides or one side of the front and back metal plates, yield shear load determined by the front and back metal plates constituting the wall plate 4. A vibration-damping or earthquake-resistant structural wall plate according to claim 1, which is intended to ensure and improve plastic deformation capacity.