JP2008138447A - Multi-layered light metal wall structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reinforcing structure formed of a light metal plate, which bears shear force in a plane of the plate, wherein the light metal plate is made of an aluminum alloy having a very thin thickness and a low strength, serves as a vibration control type earthquake resisting wall plate applicable to a small building, and exerts stable dynamic energy without degrading shear resistance even after yielding. <P>SOLUTION: The multi-layered light metal plate 1 is set up by arranging a casing frame 3 formed of band-shaped wide width planes shown in Fig. (a) along four peripheral sides, arranging a plate-like aluminum core, a paper core, a foamed body 5 of a different type, or the like, inside the frame to form an intermediate layer, and further attaching thin aluminum alloy plates 2 to front and rear surfaces of the intermediate layer. The multi-layered light metal plate functions to prevent propagation of diagonal wavy shear deformation occurring in the front and rear metal plates as shown in Fig. (b) after shear yielding, by means of peripheral casing frame members. Further the multi-layered light metal plate serves as a plate-shaped pipe body formed of the peripheral band plates and the front and rear plates, and therefore torsional rigidity is drastically enhanced, which contributes to prevention of degradation of the shear resistance even after yielding. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention is a vibration-damping type wall structure for small buildings, and avoids premature shear buckling in the elastic region for light metal plates mainly subjected to shear force to ensure shear yield load and deformation after yield. The present invention relates to a reinforced wall structure that is intended to prevent a decrease in load caused by the increase in the plastic deformation capacity of a light metal flat plate.

  In order to achieve its purpose, a substantially rectangular metal flat plate that receives shear force can maintain yield strength in the process of subsequent buckling deformation growth, even if the yield strength can be secured by increasing the shear buckling load. The shear buckling stress degree τcr must be 10 times or more than the shear yield stress degree τy and the width-thickness ratio of the flat plate must be considerably reduced. Must be arranged in a lattice pattern to subdivide the entire plate.

  In addition, in order to avoid the shear buckling of metal flat plate and the decrease in yield strength after buckling, by using a material with a very low yield point stress level, the metal flat plate has a lower yield point stress level than the required shear strength as a design. There is a method of increasing the plate thickness to increase the plate rigidity, avoiding buckling that occurs early, and increasing the plastic deformation ability after plasticization.

Other than this, as a seismic reinforcement wall for small-scale buildings such as wooden houses, light metal materials are used to suppress the shear strength of the reinforcement walls to a low level. There is a reinforcing wall or the like in which aluminum damping corrugated plates are stacked in layers by inserting the damping plate material.
Japanese Patent Laid-Open No. 11-247351 Japanese Patent Application Laid-Open No. 2002-67217 Japanese Patent Laid-Open No. 2002-235379 Japanese Patent Laid-Open No. 2003-314083 Japanese Patent Application Laid-Open No. 2004-124605

  The problem to be solved is to reduce the plate thickness as much as possible with respect to the metal flat plate subjected to shear force and to use metal materials such as aluminum alloy with low rigidity and strength so that early shear buckling occurs. In addition, it is intended to provide a thin and lightweight seismic reinforcement wall for small-scale buildings and the like with a simple and effective reinforcement structure by preventing a decrease in shear strength after shear yielding and increasing plastic deformation ability.

  As a light metal flat plate reinforcement structure that receives a shearing force in the flat plate surface, a frame-shaped metal frame is formed on the four sides of the metal strip to give a width, and a flat aluminum core, paper core, A multi-layer metal flat plate in which various foams are inserted and a thin metal flat plate is attached to the front and back surfaces of the reinforcing structure and is intended to be stable against shear load as a whole flat plate. .

  The multi-layer light metal flat plate of the present invention comprises a thin metal plate on the front and back surfaces and a thin rectangular tube having both sides of the peripheral frame material, and the flat surfaces on the front and back surfaces are held in parallel by the filler. The St. Bunnan torsional rigidity is increased, the plate rigidity of the multilayer metal flat plate as a whole is extremely increased, and the shear strength can be stably maintained even after the shear yield.

  The light metal flat plate of the present invention can be used as an anti-vibration or anti-seismic reinforcement wall for small and medium-sized buildings without the need for special processing for reinforcement. is there. In addition, various materials to be inserted into the frame may be generally used and can be easily procured, and since they are thin and light as wallboards, they are easy to handle in the construction of small buildings.

  The light metal flat plate of the present invention is a metal flat plate which mainly receives a shearing force Q in a plane as shown in FIG. 1 (a), and FIG. The frame-shaped frame 3 is further provided with an internal reinforcing material 4 as necessary, and a flat aluminum core, paper core, various foams, etc. 5 are inserted in substantially the entire area surrounded by the band plate, and both front and back surfaces thereof are inserted. A light metal thin plate 2 is attached to form a multilayer light metal flat plate 1, which may be divided into parts and then integrated as shown by a broken line in the figure.

  FIG. 2 is an analysis example for confirming the mechanical performance of the frame-like frame, which is a structural feature of the present invention. FIG. 2A is a diagram of the front and back metal flat plate 2 having a size of 1,800 mm × 900 mm and the peripheral frame 3. (B) is a conceptual diagram of the tension field formed on the front and back metal plates after shear yielding, where the shearing force along the peripheral frame and the diagonal tensile force are in truss balance. It is considered that the compressive force acts in the ⇒ direction so as to cross and intersect with it, which accelerates the growth of the wavy shear deformation occurring in the oblique direction and affects the decrease in shear strength after yielding.

FIG. 3 shows an elastic Young's modulus E = a multi-layered light metal flat plate having the above-mentioned size, with a peripheral band plate of 6063-T6 material having a thickness of 8 mm, a front and back light metal flat plate of 1050-O material of 0.5 mm each, and an internal filler. The mechanical behavior after shear yielding was observed by changing the width of the peripheral strip to 3 kN / cm ² . In the figure, the increase in yield strength depends on the size of the frame width as shown by ●, so it is necessary to set an appropriate width. Even if the rigidity of the material is greatly increased, this tendency does not change, and it is considered that the frame widths b1 and b2 are required to be approximately 5% or more of the flat plate short side width B1.

FIG. 4 is an explanatory diagram for examining the torsional rigidity of a multilayer light metal flat plate. (A) The figure is a multilayer light metal having a size of 1,800 mm × 900 mm, a peripheral strip 90 mm × 8 mm, and both front and back plates having a thickness of 0.5 mm. A torsional moment T is applied to the flat plate from the end of the material. (B) The figure shows shear stress flow as a narrow tubular body composed of thin flat plates on both front and back sides with both side frame members sandwiched, and (c) front and back metal flat plate 2 and frame member 3 and E = 3 kN shown in the center of FIG. FIG. 5 is a cross-sectional view of a filler 5 having a thickness of / cm ² and a 9 mm thick aluminum alloy plate sandwiched between the filler 5 and a flat plate in which a space is formed between the front and back thin plates.

  Fig. 5 shows the analysis result diagram with torsional moment T and torsional angle Φ. The solid line marked with ● is when the internal filler is inserted, and the dotted line shows the same strip on both sides in the long side direction. In addition to the aluminum flat plate results indicated by □, it is 40 to 50%, and it can be seen that a very large torsional rigidity is obtained by forming a thin flat plate as a multilayer. The circles indicate that the inside is hollow and there is no multi-layer effect, and it is considered to be the torsional rigidity of the strips on both sides. The torsional rigidity of these flat plates greatly affects the buckling load and greatly affects the mechanical behavior of the flat plates after plasticization.

  FIG. 6 is an analysis example for observing the influence of the structure of the peripheral frame material and the internal reinforcing material of the multilayer light metal flat plate on the mechanical properties of the flat plate. The flat plate 1 having a size of 1,800 mm × 900 mm is shown in FIG. Is composed of a long side direction frame 3 of 75 mm x 8 mm and a short side direction frame 3 of 150 mm x 8 mm, (b) is composed of four sides of a strip of 75 mm x 8 mm and the reinforcing material 4 arranged in parallel at two locations inside. is there. The internal reinforcing material was 1050-O material so as not to increase the wall plate strength.

FIG. 7 shows the result of analysis of the above-mentioned multilayer light metal flat plate with the thin plate on the front and back sides being 1050-O material and the frame material being 6063-T6 material. Youngs modulus E = strength at E = 15 kN / cm ² compared to the case of 3 kN / cm ² is high, stable although yield strength is increased by small partitioning a plate in the example with internal reinforcement marks ●, filler The same tendency is observed with respect to the case where the Young's modulus is as low as E = 1 kN / cm ² .

  FIG. 8 shows the growth of the out-of-plane deformation of the wall plate in the large deformation region after the shear yield as the analysis result in the above example. Thus, the growth of deformation is fast regardless of the rigidity of the filler. (B) The results of the □ and ■ marks where the strip reinforcement is placed in the middle part of the figure do not depend on the rigidity of the filler compared to the former The out-of-plane deformation growth is slow and small. Suppressing the growth of these out-of-plane deformations is extremely important for the spindle-shaped hysteresis characteristics against the shearing force applied to the positive and negative alternations caused by earthquakes.

  Fig. 9 (a) shows the appearance of an existing wooden building with two wall plates combined as a seismic reinforcement wall and attached to the building, and a flat aluminum core, paper core, and various foams inside the peripheral frame 3 and the front and back metal plates 2 The structure of the intermediate layer is shown by arranging the body 5 and the like. (B) The figure shows that the shear force is parallel to the longitudinal direction of the wall plate and in the opposite direction only by being attached to the parallel column surfaces with nails or screws. It works. It is easy to manufacture a metal flat plate and handle it in construction, and it is effective to continuously and intermittently constrain deformation at a portion where both flat plates contact each other.

  In FIG. 10, two sheets of 900 mm width and 810 mm height are arranged vertically to form one wall plate, and the peripheral frame material is basically composed of 75 mm × 8 mm. Existing wooden buildings have low frame strength, and it is necessary to determine the shear strength of the reinforcing wall plate accordingly, and as shown by the ● mark, this can be dealt with by reducing the plate thickness. It is possible to maintain a stable proof strength even if the thickness is reduced, and to adjust the proof strength by narrowing the frame width within a range where it does not become unstable as shown by the dotted line with a circle.

FIG. 11 shows the result of a tensile test of an aluminum alloy material, and the seismic reinforcement wall of a small-scale building such as a wooden house needs to have a shear strength per 1,800 mm × 900 mm of about 10 to 20 kN, so that it is 1000 close to that of pure aluminum metal. It is considered that an aluminum alloy having a round house type nonlinear stress-strain relationship in the order of 3000s is optimal. The material properties of aluminum alloys are shown in comparison with structural aluminum alloys, but their elastic Young's modulus is approximately E = 6000-7500 kN / cm ² . This is the material selected in the analysis and is actually the recommended combination.

  The reinforced light metal wall plate of the present invention is a multi-layer metal flat plate formed by inserting a peripheral frame, two flat metal plates on the front and back sides, and a flat aluminum core, paper core, various foams, etc. into the inside, and light metal The flat plate is a flat metal plate that does not have to be specially processed or specially made of metal, and it does not need to be a special metal material. The shear strength of the thin light metal plate is increased after yielding by increasing the shear buckling load. Therefore, it is effective as a structural wall for vibration control or earthquake resistance for small buildings.

In the multi-layer light metal flat plate of the present invention, the internal insertion material that constitutes the intermediate layer together with the peripheral frame is important. However, as the material, the deformation of the thin metal flat plates on both sides is constrained to each other, and the strength and rigidity are well very small, 10~30kN / cm ² in an aluminum core as the elastic Young's Modulus, 1~10kN / cm ² with a paper core, a 0.3~5kN / cm ² at various foam, these materials are commonly used The procurement is easy and inexpensive.

It is explanatory drawing which shows the structure details of the reinforced light metal wall board of this invention. It is a structural diagram which verifies the effect of the peripheral part frame of a multilayer light metal flat plate. Example 1 It is explanatory drawing of the analysis result which verifies the effect of the external periphery frame of the wall board of this invention. It is explanatory drawing for confirming the torsional rigidity of a multilayer light metal flat plate. (Example 2) It is explanatory drawing of the analysis result regarding the torsional rigidity of a multilayer light metal flat plate. It is an analysis object figure which sees the effect of the peripheral frame of a flat plate, and an internal reinforcement. (Example 3) It is explanatory drawing of the analysis result which sees transition of the shear strength of this reinforcement structure. It is a figure which shows progress of the shear deformation of this reinforcement structure, and the growth of the out-of-plane deformation of a flat plate. It is a figure which shows the attachment method to the existing wooden building of the said structural wall. Example 4 It is explanatory drawing of the analysis result to which a shear force is added from the column juxtaposed to this reinforcement wall. It is the stress-strain relationship figure of the light metal material handled by this numerical analysis.

Explanation of symbols

1 Multi-layer metal flat plate subject to shearing force 2 Metal flat plate constituting both front and back surfaces 3 Peripheral frame composed of strips, etc. 4 Frame internal reinforcement composed of strips, etc. 5 Flat plate elements inserted into the middle layer 6 Wooden building Column / beam structure

Claims (4)

  A light metal flat plate reinforcement structure that receives a shearing force in a plane, a thin light metal flat plate attached to both the front and back sides of a frame-shaped frame composed of a wide surface of a strip-shaped rectangular plate to form a multilayer metal flat plate. A pipe composed of a peripheral band plate and front and back flat plates, with an aluminum core, paper core, various foams, etc., of the same thickness as the frame placed on almost the entire interior so that thin metal plates on the front and back sides are restrained from deformation. Reinforcement structure that greatly enhances torsional rigidity as a body, increases the shear buckling load as a multi-layer light metal flat plate, and maintains the proof stress even in a large deformation region after shear yielding.   A light metal flat plate reinforcement structure that receives a shearing force in a plane, and one or more strips are arranged in parallel to the frame inside the frame-like frame made of strips, or the entire flat plate is A multi-layered light metal flat plate according to claim 1, which is divided into flat plates and then integrated, and suppresses the growth of out-of-plane bending deformation accompanying shear deformation after yielding, and shear is applied to positive and negative alternating in a large deformation region after shear yielding. Reinforcement structure that has a spindle-shaped hysteresis characteristic against force.   It is a light metal flat plate reinforcement structure that receives a shear force in a plane. The frame width of the frame frame by the strip is approximately 5% or more of the inner short side length of the two sides of the rectangular flat plate. The reinforcement according to any one of claims 1 and 2, wherein the flat plate suppresses a shearing wave deformation in an oblique direction accompanying a transition to a tensile field after shear yielding, and prevents a decrease in shear strength after shear yielding. Construction. A multi-layer with a thickness of 5 to 15 mm for the peripheral frame that constitutes the intermediate layer on a flat plate with a standard size of 1,800 mm x 900 mm, intended to suppress shear strength as a vibration-damping type seismic wall plate for small buildings A thin light metal flat plate with a thickness of 1 mm or less, the tensile strength of the material is about 10 kN / cm ² or less, and the stress-strain relationship is a round house type nonlinearity. The light metal flat plate reinforcing structure according to any one of claims 1 to 2, wherein the light metal plate is made of an alloy material.

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