JP5097886B1 - Circular ring reinforced metal flat plate - Google Patents

Abstract

A metal flat plate subjected to in-plane shear is secured with a shear yield load of the flat plate and maintained in a proof stress after the shear yield, thereby imparting a plastic deformation ability required for design.
A metal plate subjected to in-plane shear is reinforced by attaching a substantially circular ring to both front and back surfaces or one side of the metal plate, and a tension field is formed on the metal plate inside the substantially circular ring to achieve mechanical stability. (a) is a typical example of this reinforcing structure, (b) is a schematic representation of the state where shear deformation has progressed in response to the applied shear load, and the circular ring is a 45 degree diagonal tension in the flat plate. Deforms into an elliptical shape with the major axis in the principal stress + σ direction. The compressive principal stress -σ due to in-plane shear balances with the member axial force σ _c due to the arch effect of the circular ring, and becomes the tension field governed by the tensile principal stress from the initial stage of receiving the shear force, so the shear yield load of the metal plate The yield strength can be maintained after yielding. The substantially circular ring is a generic name of a pseudo-circular shape including a straight line other than a circular shape, a regular dodecagon, and the like.

[Selection] Figure 1

Description

  The present invention is a reinforcing structure of a metal flat plate that receives in-plane shear and supports a compressive load as necessary. It is a wall-forming panel of a metal building, a pillar-type to beam-type shear panel or a structural wall for vibration suppression and earthquake resistance. It covers all or part of it. The shear panel is to secure the shear yield load and maintain the yield shear strength until it reaches the large deformation region after yielding, and intends the reinforcement structure to achieve this, and proposes a method as simple as possible To do.

  A flat metal plate subjected to in-plane shear maintains its shear strength in the process of shear deformation after yielding even if the shear buckling load exceeds the shear yield load, and has a stable history against repeated shear loads. Therefore, it is difficult to achieve the properties, and therefore it is necessary to reduce the width-thickness ratio of the metal flat plate. As a result, many stiffeners are arranged in a lattice shape to subdivide and reinforce the entire area of the flat plate so far. It was a representative method.

  In order to secure the yield shear load of the metal flat plate and maintain the shear strength after yielding, increase the plate thickness of the metal flat plate by using a material with a lower yield point stress than the shear strength required by the design. There are methods to avoid early shear buckling and increase the plastic deformation capacity after yielding. In addition, various reinforcement structures for vibration suppression and earthquake resistance have been proposed, such as those in which the shear panel is a corrugated plate or a folded plate, and those in which a stiffener is stacked on a flat plate surface.

Patent No. 3852192 Patent Publication Japanese Patent Laid-Open No. 2005-042423 Japanese Patent Laid-Open No. 2006-037586 Patent No. 4688234 Patent Publication Patent No. 4829384 Patent Publication

Toshiro Suzuki “Shear stiffness mainly composed of torsional stiffness and shear buckling of flat plate” Architectural Institute of Japan, September 2008 Toshiro Suzuki, 1 other "Four-corner reinforcement structure of metal flat plate subjected to in-plane shear" Architectural Institute of Japan August 2010

  The problem to be solved is to secure a flat plate shear yield load for a flat metal plate subjected to in-plane shear or a flat metal plate that supports compressive load in addition to in-plane shear. It is intended to provide the plastic deformation ability required in the design without reducing the proof stress, and to ensure the performance on the assumption that the reinforcing structure is as simple as possible.

  When the metal flat plate is subjected to a shearing force, the compressive principal stress component gradually disappears from the initial pure shear field and shifts to a tension field governed by the tensile principal stress. From this change in stress, it is considered that the decrease in shear strength of the metal plate is due to the compressive principal stress in the initial stage. After that, the tensile main stress shifts to a state governed by shear deformation, so that a stable mechanical balance can be secured by blocking the influence of the compressive main stress on the metal flat plate.

  It is important that the compressive principal stress component of the metal flat plate accompanying in-plane shear does not lead to a decrease in the proof stress of the flat plate, and an appropriate reinforcing structure for this is proposed. A circular ring reinforcing material is attached to both the front and back sides or one side of a metal flat plate, the compression main stress in the flat plate surface is handled by the axial force of the reinforcing material by the arch effect, and the tensile main stress is dominated by the flat plate region surrounded by the circular ring. Keep a stable mechanical balance as a tension field.

  FIG. 16 is a schematic diagram showing the balance of in-plane stress when a circular ring frame is provided on the outer periphery of a circular metal flat plate. (a) The figure shows a case where a shearing force is applied from the top, bottom, left, and right of the circular ring frame. As the shear deformation progresses, the circular metal flat plate is deformed into an ellipse having an angle of 45 degrees as an axis. The compressive principal stress indicated by the dotted arrow accompanying in-plane shear is balanced with the axial force of the circular ring member, so there is no effect on the flat plate, and the tension indicated by the solid arrow from the initial stage of the applied force to the start of yielding to the plastic deformation region. The tension field is dominated by the main stress.

  FIG. 16 (b) shows a case where a compressive force is applied from the upper and lower parts of the circular ring frame. Since the compressive force balances with the member axial force of the circular ring frame, the flat plate surface constitutes a tension field and spreads in the lateral direction. A circular metal flat plate is crushed by a compressive force and becomes an elliptical shape. Although the load applied to Fig. (a) and Fig. (b) is different, it is considered to be the same state from the balance of in-plane stress and deformation of the circular metal flat plate, and the main axis direction of the ellipse is only different due to the difference in tensile principal stress direction. It is.

  FIG. 17 shows the result of nonlinear analysis when the load applied from the periphery of the circular metal flat plate is shear, compression, or any combination of these. The circular metal flat plate has a diameter of 1,200 mm and a plate thickness of 3.2 mm, and the circular ring frame has a strip plate of 150 mm x 25 mm. = 60kN / cm2 to eliminate the effect of plasticizing the frame material. The vertical axis represents compressive force, shear force, and combined force, and the horizontal axis represents shear deformation angle except for compressive strain.

  (a) The case where the shearing force shown in the figure acts is the lower solid line, and the yield shear load Qy = 670 kN converted in terms of the diameter of the circle. The upper broken line is the case where the compressive force in FIG. 5B is applied, and the yield start time is substantially the same as the shear yield load indicated by the solid line. The result shown by the dotted line is the result of the ratio of compressive force and shear force being 1.0: 1.0, 0.6: 1.0, 0.3: 1.0. If the value of the vertical axis is the resultant vector sum of the two, it is almost the same as the shear yield load. Become. This means that the yield load of the circular metal flat plate is substantially the same value only in the direction in which the circular metal flat plate is deformed from a circular shape to an elliptical shape.

It is a typical figure of the circular ring reinforcement structure with respect to the rectangular metal flat plate of a protrusion flange frame. It is explanatory drawing of the analysis result regarding the cross-sectional shape of a circular ring reinforcement, and its reinforcement effect. It is a block diagram of regular polygon ring reinforcement with respect to the rectangular metal flat plate of a protrusion flange frame. It is explanatory drawing of the analysis result regarding the reinforcement effect of an octagonal ring or a dodecagonal ring. It is a block diagram of the rectangular metal flat plate of flat plate single-sided circular ring reinforcement and other side cross rib reinforcement. It is explanatory drawing of the analysis result regarding the combination reinforcement effect of a circular ring and a cross rib. It is a single to double circular ring configuration diagram for a rectangular metal plate of a frame-shaped frame. It is explanatory drawing of the analysis result of the rectangular metal flat plate which makes a square tube the both-sides side frame. It is two typical block diagrams of the circular ring reinforcement structure with respect to a rectangular metal flat plate. It is explanatory drawing of the analysis result of the circular ring reinforcement of a flange frame rectangular metal flat plate. It is explanatory drawing of the analysis result of the rectangular metal flat plate which uses a longitudinal both-sides side frame as a square tube. It is a typical figure which shows the structure with respect to the circular metal flat plate which uses a circular ring as an outer periphery frame. It is explanatory drawing regarding the mechanical balance of the circular metal flat plate which receives in-plane shear. It is a typical figure of the wall board comprised by the circular metal flat plate four sides enclosed by the circular ring frame. It is explanatory drawing regarding the mechanical balance of the circular metal wall board which receives in-plane shear. It is a schematic diagram explaining the deformation | transformation transition with respect to the circular metal flat plate of a circular ring frame. It is explanatory drawing of the analysis result regarding the circular metal flat plate on which arbitrary in-plane force acts.

A metal plate that is subjected to in-plane shear is reinforced by attaching a substantially circular ring to the front and back surfaces of the metal plate, and a mechanical field is formed by constructing a tension field for the metal plate inside the circular ring. Fig. 1 (a) is a typical example of this reinforcing structure, and Fig. 1 (b) schematically shows a state in which shear deformation progresses according to the applied shear load. The circular ring is elliptical due to the tensile principal stress + σ. It transforms into a shape. The compressive principal stress -σ associated with the in-plane shear is balanced with the compressive force σ _c of the circular ring reinforcing material due to the arch effect, and a stable tension field in which the tensile principal stress dominates from the initial stage of receiving the shearing force.

  FIG. 5 (a) is an example in which a circular ring reinforcing material is attached to the side surface of the flat plate piece, and a protruding rib passing through the center of the circular ring is provided on the opposite side surface in parallel with the peripheral frame. As shown in FIG. 5 (b), the circular ring reinforcing material is deformed into an elliptical shape with an angle of 45 degrees as an axis, and the influence on the yield shear load of the metal plate is as follows. Absent. In addition to ensuring a rigid balance between the front and back of the flat plate, this reinforcing structure can be used even when the diameter of the circular ring is small while maintaining the cooperation between the peripheral frame material and the circular ring reinforcing material, and a thin plate that serves as a tension field The mechanical stability of the metal flat plate can be ensured.

  7 (a) and 7 (b) show that, in a thin metal flat plate, in order to avoid buckling in a region sandwiched between a circular ring reinforcing member and a peripheral frame member, a band plate or a square tube is used as the peripheral frame member. The frame is framed to join. It is important to place the circular ring reinforcement close to the peripheral frame material, but the circular ring on one side of the flat plate is close to the frame material, and the circular ring on the other side is placed inside so that it is concentric. It can also be considered as a ring. It should be noted that in the frame-like frame structure in which the band plate or the like is configured with a wide surface, it is necessary to consider so as not to restrain the angular deformation accompanying the shear deformation of the metal flat plate at the peripheral four corners.

  FIG. 12 shows a typical example of this structure in which the outer peripheral portion of a circular metal flat plate is surrounded by a circular ring and a shearing force is applied from the top, bottom, left and right portions. The stress in the flat plate surface due to the shearing force is expressed by a tensile principal stress + σ in the direction of 45 ° obliquely indicated by a solid line arrow and a compression principal stress −σ indicated by an orthogonal dotted line arrow. This compressive principal stress balances with the axial force of the frame material due to the arch effect of the circular ring, and the tensile surface is constructed in an oblique direction without affecting the circular metal flat plate. In the circular ring frame structure, the initial stage of applied force, shear The tension field occurs during the entire process of mechanical balance after yielding and after shear yielding.

FIG. 1 (a) shows a typical embodiment, in which a metal plate 1.1 of 900 mm × 900 mm and a plate thickness of 6.0 mm is surrounded by a projecting flange 1.2 of a strip plate 150 mm × 16 mm, and a circular ring 1.5 having a diameter of 750 mm is attached to both sides of the plate. Because of the circular ring and the plate thickness is 50mmx12mm, 32mmx19mm, 25mmx25mm and 50mmx16mm, 32mmx25mm, in 25Mmx32mm, approximately 12cm ² the former as the cross-sectional area, the latter is approximately 16cm ^2. In the examples herein, the metallic material yield stress of σ _y = 30kN / cm ^2, and the Young's modulus = 20,500kN / cm ² of the steel material.

   In the analysis result of FIG. 2, the case where the circular ring is 50 mm is indicated by a solid line, and the case where the circular ring is 32 mm is indicated by a dotted line. Even if the circular ring member is different from 50mm and 32mm, the shear yield load can be secured to Qy = 900kN, and the plastic deformation ability is about the same if the cross-sectional area of the circular ring is almost the same. When the circular ring member indicated by the broken line is 25 mm, the plastic deformation ability is slightly inferior even if the cross-sectional area is the same. In maintaining the yield strength after yielding, the relationship between the tensile force in the flat plate surface and the cross-sectional area of the circular ring is strong, and the relationship between bending rigidity and torsional rigidity is weak.

  3A is an example of an octagonal shape, and FIG. 3B is an example of a dodecagonal regular polygonal ring 1.6. The vertices of the regular polygon are aligned on both diagonals of the square metal plate 1.1 subjected to in-plane shearing, which is effective in terms of force balance against compressive principal stress in the direction of 45 degrees obliquely due to in-plane shearing. Because I thought. For the metal flat plate 1.1 with the same configuration as the previous embodiment, it is a regular polygon circumscribing the circumference with a diameter of 750 mm. It is a seed.

  In the analysis result of FIG. 4, the regular polygonal ring is indicated by a solid line for 50 mm and a dotted line for 32 mm. As a comparison, the result of a circular ring is also included. However, the plastic deformation capacity of a regular dodecagonal ring is almost the same as that of a circular ring, but the regular octagonal ring is inferior to both results of anterior tilt even if the member cross section is raised. . In the polygonal ring, local bending generated according to the length of a member on one side is considered to be greatly involved, and when the reinforcing material is a polygon, it is desirable that the polygonal ring has a substantially regular dodecagon or more.

  The embodiment of FIG. 5 (a) is a metal plate 1.1 having a thickness of 900 mm × 900 mm and a thickness of 6.0 mm, a peripheral frame 1.2 having a strip 150 mm × 16 mm as a protruding flange, and the circular ring reinforcement 1.5 and the cross rib reinforcement 1.7 are the same strip 50 mm × 16 mm. As a result, it is attached to the front and back surfaces of the flat plate to balance the rigidity. The attachment portion of the rib reinforcing material shown in the figure does not constrain the deformation of the circular ring into an ellipse having both the long and short axes in the oblique 45 degree direction. The diameter of the circular ring is 750 mm, 700 mm, and 650 mm, but a certain amount of width is allowed for the size of the circular ring by combining the circular ring and the cross rib.

   In the analysis result of FIG. 6, there is not much difference between the three results shown by the dotted lines, and the mechanical behavior is hardly influenced by the size of the circular ring due to the cross rib reinforcement. The solid line is the case where the circular rings are arranged overlapping both front and back surfaces, but the reinforcing structure shown by the dotted line is slightly lower than the plastic deformation capability. The broken line at the bottom of the figure is the result of doubling the thickness of the circular ring only from the side of the flat plate, but the bending stiffness bias on both sides of the flat metal plate ensures the yield load of the flat metal plate and yields. It is difficult to maintain the shear strength later.

  In the embodiment of FIG. 7, a metal plate 1.1 having a thickness of 900 mm × 900 mm and a thickness of 3.2 mm is attached to a plate plate 75 mm × 12 mm as the upper and lower force applied portion frame material 1.3 on both sides of the flat plate with its wide surface. Is attached so that a flat plate surface is covered with a C-shaped cross-section member of 75 mm × 45 mm × 2.3 mm. By adopting a tubular body with cavities in the left and right side frames, the torsional rigidity is greatly increased to achieve mechanical stability. (a) The figure shows the case where steel bars 25 mm x 25 mm are overlapped from both front and back surfaces as a circular ring reinforcing material, and (b) the figure shows the case where the circular ring diameter is changed on the front and back surfaces of the flat plate to form a double ring.

   In the analysis result shown in FIG. 8, the solid line is the same circular ring as in (a) and the diameter is 700 mm, 650 mm, and 600 mm, and the dotted line is (b) 700 mm in diameter on the surface and close to the peripheral frame material. And on the back, the diameter is 600mm, 550mm, 500mm, and it is a case where it is a double wheel. In the solid line, if the diameter of the circular ring is small and away from the surrounding framework, the yield strength decreases at the initial stage of yielding. The dotted line shows a case where circular rings with different diameters are attached to form a double ring, but all reach the yield shear load and the shear strength is stably maintained after yielding.

   Fig. 9 (a) shows a columnar shear panel 1.1 with a rectangular metal plate of 2,700mm x 900mm with a thickness of 3.2mm. 1.7 is 50 mm x 12 mm, and the front and back surfaces of the plate in the longitudinal direction are alternately attached. In contrast to the case where horizontal shearing force is applied from the upper and lower ends of the rectangular flat plate and the case where shearing force is applied under a constant compression axial force, the frame material on both sides in the longitudinal direction is free to deform out of the flat plate surface, but the protruding flange frame material is In order to be weak against torsion, a lateral rib passing through the center of the circular ring is provided for reinforcement.

   9 (b) is also a rectangular metal flat plate 1.1 having the same thickness and shape, and both side frame members 1.4 in the longitudinal direction are attached with a strip 75mm x 19mm wide from one side of the flat plate and a square square tube 75mm x 3.2mm on the other side. The short direction frame member 1.3 is divided into two upper and lower stages by arranging a strip 150 mm × 19 mm on the side and the middle in the longitudinal direction. A circular ring reinforcing member 1.5 having a diameter of 700 mm is arranged at the center position of the upper and lower flat plate surfaces, and a band plate 50 mm × 25 mm is eccentrically attached from one flat plate surface so as to be within a deep pocket on the longitudinal side tube frame side. The applied load and boundary conditions are the same as in the above analysis example.

   FIG. 10 shows the analysis result of the previous figure (a), where the vertical axis indicates the shear force above and below the stud and the horizontal axis indicates the shear deformation angle with respect to the stud. A case where the circular ring reinforcing material is overlapped on both the front and back surfaces is indicated by a broken line, a case where the circular ring reinforcing material is constituted by a lateral rib is indicated by an upper solid line, and a case where the circular ring reinforcing material is constituted by a longitudinal rib is indicated by a lower solid line. The dotted line is the analysis result under a constant compression axial force where P = 300 kN, which is approximately 20% of the yield axial force converted by the cross-sectional area of both frame members in the longitudinal direction. From all these results, it can be seen that the rib reinforcement is more effective in the horizontal direction than in the vertical direction.

  Fig. 11 shows the analysis result of Fig. 11 (b). The solid line indicates the case where the circular ring reinforcement is eccentrically attached from one side of the flat plate, and the broken line indicates that the circular ring reinforcing material having the same cross-sectional area is attached with the rigidity balance from both sides of the flat plate. In the case of contact, the results of both are almost unchanged. The dotted line is the behavior under the constant compression axial force of P = 300 kN for the same example, and the axial force is about 20% of the yield axial force of the longitudinal cross-sectional areas of both frames. If the circular ring reinforcing material is brought close to the short-side direction frame member, disposition to some extent in the longitudinal direction is allowed, but it is assumed that there is no decrease in yield strength due to flat plate buckling outside the circular ring.

  FIG. 12A shows a circular ring frame structure in which a circular metal flat plate 2.1 is surrounded by a circular ring 2.2 and a shearing force is applied from the upper, lower, left and right applied parts 2.3. The flat plate associated with the shearing force has a pure tensile surface in an oblique direction, and becomes a tension field from the initial stage of applying force to the point of shear yielding and all the steps after shearing yielding. As an example, the diameter of the circular metal plate is 1,200 mm, the plate thickness is 3.2 mm, 2.3 mm, 1.6 mm, and 1.2 mm, and the flange width of the circular ring frame is 150 mm, and the flange thickness is 25 mm, 22 mm, 19 mm, and 16 mm. The width-thickness ratio converted to the diameter of the circular metal plate is 375, 520, 750, 1,000.

  In FIG. 13, the vertical axis is the dimensionless value with the shear yield load Qy, the horizontal axis is the shear deformation angle, the analysis result of each plate thickness is a solid line, and the dotted line is the shear deformation angle expanded 10 times Expressed and scale corresponds to 1/10 value. As a result of the solid line, all of them reached the large deformation region after yielding, but they remained stable without decreasing the yield strength. In the mechanical behavior before and after the yield indicated by the dotted line, there is a linear load deformation relationship until the shear yield load, and after the shear yield, it changes substantially horizontally and the proof stress is maintained. The shear yield deformation angle of a circular metal plate is approximately 1.5 times that of a square metal plate.

  FIG. 14 shows a composite wall plate having four unit circular ring framed metal plates 2.1 as four sides, and adjacent circular ring frames 2.2 are connected to the upper, lower, left and right sides of the wall plate, and a partial frame member 2.3 is provided for shearing force. Furthermore, a cross-shaped reinforcing material 2.4 is arranged vertically and horizontally from both sides of the metal flat plate. In this embodiment, the unit circular metal plate constituting the wall plate has a diameter of 1,200 mm, a plate thickness of 2.3 mm, and a width-thickness ratio of 520, which are arranged in two rows and two columns, and T-shaped cross-section members are arranged vertically and horizontally. It is a force framework. Each circular ring frame material is a strip plate 150 mm x 19 mm, and the cross reinforcing member is a strip plate 50 mm x 12 mm.

  FIG. 15 shows an analysis result in which the vertical axis represents the shear force of the entire wall plate and the horizontal axis represents the shear deformation angle with respect to the wall plate of about 2,400 mm. The mechanical behavior when in-plane shear is applied from the upper, lower, left, and right force frames of the composite wall plate is shown by two solid lines. The solid line indicates the case where the rib reinforcements are stacked vertically on the front and back surfaces of the flat plate. From the viewpoint of plastic deformation capability, it is better to constrain the circular ring frame at the four plate loading positions with the cross reinforcing material, and it is considered that there was an effect in not breaking the local arc of the frame material.

  Further, FIG. 15 shows the result of in-plane shear under a constant compression axial force of about 15% of the yield axial force of the frame cross-sectional area and P = 400 kN. Even when a compression axial force is applied to the circular ring frame, it is more effective to constrain the circular ring frame at four locations by cross reinforcement. The analysis result indicated by the broken line in the figure is the case where all the rib reinforcing members of the circular metal flat plate are removed and the constant compression axial force is P = 200 kN, which is half of the above, but this is all axial force passes through the circular ring frame. This is due to the early yielding of the frame material.

  The present invention proposes a reinforcing structure for a rectangular metal flat plate subjected to in-plane shearing, and is a reinforcing structure in consideration of in-plane principal stress in order to ensure a stable balance of the flat plate. By attaching a circular ring to the flat plate surface, the influence of the compressive principal stress on the flat plate disappears and becomes a tension field, so it has a simple structure compared to the conventional grid reinforcement method, and it can be easily manufactured and the cost is expected to be low It is most suitable as a wall panel for metal buildings and as a shear panel for damping or earthquake resistance.

  For an extremely thin metal plate subjected to in-plane shear, an ideal oblique tension field can be constructed by using a circular metal plate surrounded by a circular ring framework, resulting in an ideal elastic gradient up to the shear yield load. Even after yielding, the shear strength is stably maintained without decreasing to the large shear deformation region. This simple structure is particularly suitable for a thin metal plate and may be a metal foil, and it can be considered to be a powerful reinforcement structure for metal materials as well as various steel materials and light metal materials.

  In the present invention, as a reinforcing structure for a rectangular metal flat plate subjected to in-plane shear, an initial shear yield load can be ensured by attaching a plurality of circular ring reinforcing members in the flat plate surface. Maintaining the shear strength after yielding can be achieved by attaching a square tube etc. to both sides of the metal plate in the longitudinal direction and increasing the plastic torsional load. It is considered to be an advantageous structure from the viewpoint of construction work.

  The circular ring reinforcing material and the circular ring frame member of the present invention can be considered to be a pseudo-circular shape including a straight other straight portion, a regular twelve polygonal shape, etc., and these are collectively referred to as a substantially circular ring. Since the same function as a circular ring can be expected by grasping the mechanical difference between the circular arc portion and the straight line portion constituting the shape, it is possible to freely select a shape that is advantageous in design, manufacture, assembly, and the like.

1.1 Metal plate subjected to in-plane shear
1.2 Peripheral flange type peripheral frame material
1.3 Peripheral frame material joined with wide strip
1.4 Frame material that forms a closed cross-section such as a square tube
1.5 Circular ring reinforcement attached to a metal flat plate
1.6 Polygonal ring reinforcement attached to a metal plate
1.7 Straight rib reinforcement through the center of the circular ring
2.1 Circular metal plate subjected to in-plane shear
2.2 Frame material around protruding flange type circular ring
2.3 Partial frame material for circular ring force
2.4 Straight rib reinforcement through the center of the circular ring

Claims (4)

  It is a reinforcing structure of a metal flat plate mainly subjected to in-plane shear, which is formed by attaching a substantially circular ring to both the front and back surfaces or one side of the metal flat plate, and the peripheral circular frame member is formed on a rectangular metal flat plate having a protruding flange as a frame. Placed in close proximity to each other, with the plate's four corners as a substantially triangular region to suppress plate buckling and to create a tension field for the circular metal plate inside the substantially circular ring, ensuring shear yield load and plastic deformation Reinforced structure of a metal flat plate to improve performance.   Reinforcement structure of a metal flat plate, which is mainly subjected to in-plane shear, with a substantially circular ring attached to both the front and back sides or one side of the metal flat plate. About a metal flat plate, arrange a nearly circular ring in close proximity without contacting the surrounding frame material, reinforce it widely along the side of the periphery of the flat plate, construct a tension field for the circular metal plate inside the substantially circular ring, and shear yield load Reinforcement structure of a metal flat plate that secures and improves plastic deformation capacity.   Reinforcement structure of a metal flat plate mainly subjected to in-plane shear, which is formed by attaching a substantially circular ring to both the front and back surfaces or one side of the metal flat plate, and is configured as a circular metal flat plate having a majority of the substantially circular ring as an outer peripheral frame; A member for applying force is provided in a part of the substantially circular ring in accordance with the direction of action of the shear load, and a tension field is configured in the balance between the substantially circular ring frame and the stress in the plane of the flat plate. Reinforcement structure of metal flat plate to ensure shear yield load and improve plastic deformation capacity.   A reinforcing structure of a metal flat plate mainly subjected to in-plane shear, which is formed by attaching a substantially circular ring to both the front and back surfaces or one side of the metal flat plate, wherein the metal flat plate is surrounded by a substantially circular ring and is formed on a metal flat plate inside the circular ring. Although it constitutes a tension field, rib reinforcement is provided in all or part of the cross direction passing through the center of the substantially circular ring in accordance with the direction in which the shear load acts, ensuring the shear yield load and improving the plastic deformation capacity. The reinforcing structure for a metal flat plate according to any one of claims 1, 2, and 3.

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