Inorganic load-bearing surface material and load-bearing wall

Abstract

The invention provides an inorganic bearing surface material and a bearing wall provided with the inorganic bearing surface material, which can increase the ultimate bearing capacity correction value as much as possible by increasing the plastic modulus, thereby improving the wall multiplying power. The bearing surface material 50 is an inorganic bearing surface material 50, and the surface material width of the bearing surface material 50 is less than 910 mm when observed from the front side. Preferably, the bearing capacity value used when the wall multiplying power of the bearing surface material is calculated is determined by an ultimate bearing capacity correction value obtained by correcting the ultimate bearing capacity of the bearing surface material based on the plastic modulus among the following four bearing capacities: (1) yield bearing capacity Py; (2) an ultimate bearing capacity correction value Pu 'obtained after the ultimate bearing capacity Pu is corrected based on the plastic modulus mu (wherein mu = delta u / delta v, delta u is the ultimate displacement, and delta v is the yield point displacement); (3) the maximum bearing capacity Pmax is 2 / 3; and (4) the bearing capacity when the apparent shear deformation angle is 1 / 120 rad or the bearing capacity when the real shear deformation angle is 1 / 300 rad.

Description

Technical Field

[0001] The invention relates to an inorganic load-bearing surface material and a load-bearing wall. Background Art

[0002] In order to make walls such as exterior walls and partition walls have a high wall ratio, it is necessary to increase the shear strength (or stiffness) of the load-bearing surface materials that form the wall. Here, the load-bearing surface materials mainly include wooden load-bearing surface materials and inorganic load-bearing surface materials. Wooden load-bearing surface materials include structural plywood, medium density fiberboard (MDF: Medium Density Fiberboard) and oriented strand board (OSB: Oriented Strand Board). On the other hand, inorganic load-bearing surface materials include cement board, calcium silicate board and gypsum board (including gypsum board). Compared with wooden load-bearing surface materials, inorganic load-bearing surface materials are widely used in wooden structure building walls due to their better fire resistance, moisture permeability and dimensional stability.

[0003] Therefore, in order to improve rigidity, high-density inorganic load-bearing surface materials (boards) with a specific gravity of 1.0 or more were used in previous wooden buildings. However, since high-density inorganic load-bearing surface materials are heavy, they have problems such as poor handling and easy cracking when fasteners such as nails are driven into columns and studs.

[0004] In addition, in order to achieve a high wall ratio, it is not used to increase the maximum bearing capacity P of inorganic load-bearing surface materials. max It is a hard load-bearing surface material, but has a longer residual strength like wood (limit displacement δ u However, for example, for a gypsum board with a density of 1.0 (an example of an inorganic load-bearing surface material, i.e., a gypsum surface material with a gypsum board base paper covered on the outside of the gypsum board core (core material)), when the maximum load-bearing capacity P is reached, max At the stage of deformation, the gypsum core is destroyed and the remaining strength disappears. -3 rad, the intensity will decrease in advance, and the intensity will decrease to 0.8P max Below. Here, 0.8P max It means that the load-bearing surface material reaches the limit displacement δ u The carrying capacity of time.

[0005] Therefore, if the specific gravity of the gypsum board is reduced, the side resistance of the nail is reduced and the maximum bearing capacity P maxHere, "nail side resistance" refers to the shear bearing capacity or shear strength of the nailed portion of the load-bearing surface material measured by the nail side resistance test specified in JIS A 6901. Although the toughness of the gypsum board is improved to some extent by reducing the specific gravity, the strength of the gypsum board itself is reduced, which leads to problems such as reduced rigidity and inability to obtain sufficient load-bearing performance.

[0006] The width of a general inorganic load-bearing surface material is 910 mm or more, more specifically, in the range of 910 mm to 1820 mm. Inorganic load-bearing surface materials with such a general width generally have high rigidity, but tend to have low toughness and thus low load-bearing performance as a load-bearing surface material. Here, in this specification, "surface material width" refers to the length of the short side when viewed from the front, and "low toughness" refers to the limit displacement δ u 30×10 -3 Up to 35×10 -3 rad shear deformation angle.

[0007] In addition, the axis length of the load-bearing wall (the length of the wall in the building plan) is often used as an indicator of the strength of a wooden building to resist short-term horizontal loads (earthquake force, wind pressure, etc.). The axis length is calculated using the wall ratio corresponding to the structure of the load-bearing wall. The "wall ratio" here refers to an indicator of the seismic performance or load-bearing performance of the load-bearing wall. The larger the value, the greater the seismic strength.

[0008] The calculation method of the wall ratio is summarized. In principle, the minimum bearing capacity value among the following four bearing capacity values ​​(1) to (4) is determined as the short-term reference shear bearing capacity P o , the short-term reference shear bearing capacity P o The value obtained by multiplying by a predetermined reduction coefficient (α) (a coefficient for evaluating the main cause of reduction in bearing capacity) is defined as the wall ratio:

[0009] (1) Yield bearing capacity P y ;

[0010] (2) Ultimate bearing capacity P u Corrected value P of the ultimate bearing capacity based on the plastic modulus μ u ';

[0011] (3) Maximum load capacity P max 2 / 3;

[0012] (4) Bearing capacity when the shear deformation angle is 1 / 120 rad.

[0013] For wooden load-bearing surface materials with high toughness, the bearing capacity value is usually determined by the above (1), while for inorganic load-bearing surface materials with low toughness, the bearing capacity value is usually determined by the above (2). That is, as mentioned above, in general inorganic load-bearing surface materials with a surface width of more than 910 mm, the ultimate bearing capacity P u Small, plastic modulus μ is small, so the ultimate bearing capacity correction value P u 'The bearing capacity value is determined, and the wall ratio is specified based on the bearing capacity value. Therefore, there is room for improvement in the wall ratio calculated based on the low bearing capacity value.

[0014] Therefore, an inorganic load-bearing surface material is desired, wherein, for the inorganic load-bearing surface material, by increasing the plastic modulus μ, the ultimate bearing capacity correction value P is increased as much as possible. u ', thereby being able to increase the wall ratio.

[0015] Here, Patent Document 1 proposes a wooden exterior wall structure having a structure in which a surface material is constructed on the outdoor side surface of a wooden frame or a wooden shaft group. The wooden exterior wall structure has a gypsum board fixed as a load-bearing surface material on the outdoor side surface of a wooden frame member or a wooden shaft group member, and the gypsum core portion of the gypsum board contains an organic polysiloxane compound as a load-bearing capacity deterioration prevention agent to prevent the deterioration of the load-bearing capacity, and the wall body formed by fixing the gypsum board as a load-bearing surface material to the frame or the shaft group has a wall ratio of 2.0 or more as the strength of the wooden exterior wall against short-term horizontal loads.

[0016] Patent Document 1: Japanese Patent Application Publication No. 2015-165087 Summary of the invention

[0017] <Problems to be Solved by the Invention>

[0018] According to the wooden exterior wall structure described in Patent Document 1, the strength of the wooden exterior wall against short-term horizontal loads can maintain a wall ratio of 2.0 or more. However, regarding the above-mentioned problem, i.e., regarding inorganic load-bearing surface materials, there is no disclosure of a method for increasing the wall ratio by increasing the ultimate bearing capacity correction value as much as possible by increasing the plastic modulus.

[0019] The present invention provides an inorganic load-bearing surface material and a load-bearing wall having the inorganic load-bearing surface material, which can increase the ultimate bearing capacity correction value as much as possible by increasing the plastic modulus, thereby improving the wall ratio.

[0020] <Methods used to solve the problem>

[0021] In the inorganic load-bearing surface material according to one embodiment of the present invention,

[0022] The width of the load-bearing surface material when viewed from the front is less than 910 mm.

[0023] Furthermore, in the inorganic load-bearing surface material according to another embodiment of the present invention,

[0024] The bearing capacity value used in calculating the wall ratio of the yield surface material is determined by the ultimate bearing capacity correction value of the load-bearing surface material corrected based on the plastic modulus among the following four bearing capacities:

[0025] (1) Yield bearing capacity P y ;

[0026] (2) Ultimate bearing capacity P u Corrected value P of the ultimate bearing capacity based on the plastic modulus μ u '(where μ = δ u / δ v , δ u is the limit displacement, δ v is the yield point displacement);

[0027] (3) Maximum load capacity P max 2 / 3;

[0028] (4) The bearing capacity when the apparent shear deformation angle is 1 / 120 rad or the bearing capacity when the true shear deformation angle is 1 / 300 rad.

[0029] <Effects of the Invention>

[0030] According to the present invention, an inorganic load-bearing surface material and a load-bearing wall having the inorganic load-bearing surface material can be provided, which can increase the ultimate bearing capacity correction value as much as possible by increasing the plastic modulus and thus improve the wall ratio. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a front view of an example of a load-bearing wall including an inorganic load-bearing surface material according to an embodiment.

[0032] Figure 2 The diagram shows both the envelope of the load-deformation angle curve obtained by the in-plane shear test of the wooden building and a line graph of the load-deformation angle characteristics after the envelope is converted into a completely elastic-plastic model. DETAILED DESCRIPTION

[0033] Hereinafter, an inorganic load-bearing surface material and a load-bearing wall according to an embodiment will be described with reference to the drawings. In addition, in this specification and the drawings, overlapping descriptions may be omitted by assigning the same reference numerals to substantially the same components.

[0034] [Inorganic load-bearing surface material and load-bearing wall according to embodiment]

[0035] Reference Figure 1 and Figure 2 , an example of an inorganic load-bearing surface material and a load-bearing wall according to an embodiment is described. In addition, although gypsum board is described below as an inorganic load-bearing surface material, cement board or calcium silicate board can also be applied to the inorganic load-bearing surface material according to the embodiment. Here, Figure 1 This is a front view of an example of a load-bearing wall provided with an inorganic load-bearing surface material according to an embodiment. Figure 2 The diagram shows both the envelope of the load-deformation angle curve obtained by the in-plane shear test of the wooden building and a line graph of the load-deformation angle characteristics after the envelope is converted into a completely elastic-plastic model.

[0036] Figure 1 The load-bearing wall 70 shown is a load-bearing wall of a wooden shaft group construction method formed by fixing a wooden shaft group to a reinforced concrete belt-shaped foundation 10 .

[0037] On the strip foundation 10, a base 22 (an example of a lower beam) extending in the transverse direction (e.g., in the horizontal direction) is fixed via anchor bolts 11. On the base 22, two columns 31 (an example of a longitudinal beam) and a plurality of (three in the figure) intermediate columns 32 (another example of a longitudinal beam) arranged at predetermined intervals therebetween are fixed, and a beam 21 (an example of an upper beam) extending in the transverse direction (e.g., in the horizontal direction) is fixed to the upper ends of these plurality of longitudinal beams 30. Thus, a frame 40 is formed by the base 22, the beam 21, and the plurality of longitudinal beams 30. Here, the load-bearing wall 70 illustrated in the figure is shown as an example formed in the structural plane of the first floor, but in the load-bearing wall formed in the structural plane of the upper floor of the second floor or more, the lower beam and the upper beam are beams of the upper floor.

[0038] The base 22, the longitudinal beams 30, and the beams 21 are all formed of wood (square timber) suitable for ordinary wooden buildings.

[0039] The inorganic load-bearing surface material 50 fixed to the frame 40 is a gypsum board. Gypsum boards include structural gypsum boards and reinforced gypsum boards specified in JIS A 6901, ordinary gypsum boards, etc., but structural gypsum boards and reinforced gypsum boards are preferably used as load-bearing surface materials. Gypsum boards are gypsum-based surface materials in which the front and back surfaces of a plate-shaped core material composed of a gypsum core (hardened gypsum) are covered with gypsum board base paper.

[0040] The dimensions of the gypsum board 50 used are: the surface material width t1 is 600 mm, the surface material height t2 is about 2800 mm (in the range of about 2730 mm to 3030 mm), and the thickness of the gypsum board 50 is 9.5 mm or 12.5 mm.

[0041] That is, the surface material width t1 of the gypsum board 50 is set to a width narrower than the conventional range of 910 mm to 1820 mm. Here, the plurality of gypsum boards 50 illustrated in the figure are in a form having the same surface material width t1, but for example, three or more gypsum boards may all have different surface material widths, or a plurality of gypsum boards having the same surface material width and other gypsum boards having different surface material widths may be provided.

[0042] Here, the surface material width t1 may be set to 225 mm, 250 mm, 300 mm, 455 mm, 500 mm, 800 mm, etc., in addition to 600 mm, as a width smaller than 910 mm.

[0043] The gypsum board 50 is fixed to each longitudinal beam 30 by a plurality of nails 60 (an example of fasteners). Here, the nails 60 may be, for example, electroplated iron round nails (NZ nails: JIS A 5508), or NZ50 nails (length 50 mm, head diameter of about 6.6 mm, shaft diameter of about 2.75 mm). Here, the fasteners 60 may be screws (including bolts) or the like in addition to nails.

[0044] The fixed interval t3 of the nails 60 may be set within a range of 50 mm to 300 mm, for example, 150 mm.

[0045] The load-bearing wall 70 is formed by fixing two gypsum boards 50 having the same surface material width t1 to the frame 40, but three or more gypsum boards 50 may be fixed, or a plurality of gypsum boards having different surface material widths may be fixed.

[0046] By setting the surface material width t1 of the gypsum board 50 forming the load-bearing wall 70 to be less than 910 mm, the toughness of the gypsum board 50 and the load-bearing wall 70 is improved, and the wall ratio of the load-bearing wall 70 can be increased. Figure 2 Explain your reasons in detail.

[0047] Figure 2 The diagram shows both the envelope of the load-deformation angle curve obtained by the in-plane shear test of the wooden building and a line graph of the load-deformation angle characteristics after the envelope is converted into a completely elastic-plastic model.

[0048] The fully elastic-plastic model consists of a linear function straight line in the linear elastic region (elastic region) and a linear function straight line from the yield point σ s The straight line extending parallel to the X-axis forms the plastic deformation zone (plastic zone). Yield point σ s Here, the method of converting the envelope into a completely elastic-plastic model is described in documents such as "Wooden Load-bearing Wall and Its Ratio Performance Test / Evaluation Business Method Book" and is a well-known method.

[0049] Figure 2 The maximum load capacity P is shown max , 0.8P max Load drop area, ultimate bearing capacity P u , yield bearing capacity P y , limit displacement δ u , yield point displacement δ v and yield displacement δ y . Limit displacement δ u and yield point displacement δ v They are respectively at 0.8P max Load drop zone and yield point σ s In addition, the yield displacement δ y is the yield bearing capacity P y The shear deformation angle during the performance. In addition, the plastic modulus μ is δ u / δ v The value of .

[0050] As stated in the Allowable Stress Design of Wooden Axis Construction Method Houses[1] (2017 edition) on pages 63 and 300, Figure 2 The bearing capacity P determined by the fully elastic-plastic model shown max , P u , P y and displacement δ u ,δ v ,δ y , calculate the short-term allowable shear bearing capacity P a and the short-term allowable shear bearing capacity P a Divide by the specified bearing capacity (wall length L (m) × 1.96 (kN / m)) to calculate the wall ratio.

[0051] In the calculation of the wall ratio, in principle, the minimum bearing capacity value among the following four bearing capacity values ​​(1) to (4) is determined as the short-term reference shear bearing capacity P o , the short-term reference shear bearing capacity P o The value obtained by multiplying the predetermined reduction coefficient (α) (a coefficient for evaluating the cause of the reduction in bearing capacity) is set as the short-term allowable shear bearing capacity P a Here, the ultimate bearing capacity correction value P u 'Through 0.2P u / Ds=0.2P u ×(2μ-1) 1 / 2 Calculation, structural characteristic coefficient Ds = 1 / (2μ-1) 1 / 2 :

[0052] (1) Yield bearing capacity P y ;

[0053] (2) Ultimate bearing capacity P u Corrected value P of the ultimate bearing capacity based on the plastic modulus μ u ';

[0054] (3) Maximum load capacity P max 2 / 3;

[0055] (4) The bearing capacity at a specific deformation and the bearing capacity when the apparent shear deformation angle is 1 / 120 rad (no-load type or load type).

[0056] In addition, in all the test specimens, the yield displacement δ y When the actual shear deformation angle is less than 1 / 300 rad and there is no significant damage when the actual shear deformation angle is 1 / 300 rad, the bearing capacity at the specific deformation in (4) is not the bearing capacity when the apparent shear deformation angle is 1 / 120 rad, but the bearing capacity when the actual shear deformation angle is 1 / 300 rad. And, among the three bearing capacity values ​​in (2) to (4) above, the bearing capacity value representing the minimum value is determined as the short-term reference shear bearing capacity P o .

[0057] For wooden load-bearing surface materials with high toughness, the bearing capacity value is mostly determined by the above (1), while for gypsum boards 50 with low toughness, the bearing capacity value is mostly determined by the above (2). That is, in the conventional gypsum boards with a general surface material width of more than 910 mm, the ultimate bearing capacity P u Small, plastic modulus μ is small, so the ultimate bearing capacity correction value P u 'The bearing capacity value is determined, and the wall ratio is determined based on the bearing capacity value, so there is room for improvement in the wall ratio.

[0058] Therefore, the inventors of the present invention have focused on researching and improving the toughness of the gypsum board and increasing the ultimate bearing capacity correction value P by re-examining the size of the gypsum board instead of developing gypsum board materials. u ', which is the bearing capacity value used in calculating the wall ratio, thus making it possible to increase the wall ratio.

[0059] That is, by reducing the surface material width t1 of the gypsum board 50 from the conventional range of 910 mm to 1820 mm to a range less than 910 mm, the toughness of the gypsum board 50 and the load-bearing wall 70 equipped with the gypsum board 50 can be improved, thereby increasing the wall ratio. The content of the in-plane shear test will be described in detail below. u 30×10 -3 Up to 35×10 -3rad, the limit displacement δ of the gypsum board 50 shown in the figure u 40×10 - 3 rad or more, confirming the improvement of toughness.

[0060] More specifically, the limit displacement δ of the gypsum board 50 u Maximum is 66.7×10 -3 The shear deformation angle of rad has been verified to be about twice as tough as that of ordinary gypsum boards.

[0061] In addition, when the wall ratio of the load-bearing wall equipped with the gypsum board of the prior art is used as a benchmark, the wall ratio ratio (relative to the wall ratio of the previous load-bearing wall) of the load-bearing wall 70 having a plurality of gypsum boards 50 with a width of the surface material less than 910 mm (225mm, 300mm, 455mm, 600mm, 800mm, 847mm) is in the range of 1.16 to 1.98. It has been verified that the wall ratio of the load-bearing wall 70 is above 3.0.

[0062] [In-plane shear test and its results]

[0063] The present inventors prepared a test body related to a load-bearing wall according to the no-load or load-type test specifications (test body, test device and test method) described in the "Wooden load-bearing wall and its multiple performance test / evaluation business method book". The comparative example is a load-bearing wall with a wall width of 1820 mm, which is equipped with two gypsum boards containing glass fibers with a surface material width of 910 mm and a height of 2730 mm.

[0064] The test body has a frame formed by a base and two columns made of fir with a cross-section of 105×105 mm, a spacer with a cross-section of 45×105 mm located between the two columns, and a beam made of yellow fir with a cross-section of 180×105 mm supported by the columns. As a test fixture, a hardware press is set at the joint between the base and the column and at the joint between the beam and the column.

[0065] Here, for comparison with the comparative example, a test body was prepared in which particleboard (two pieces with a width of 910 mm) was used as the load-bearing surface material instead of the gypsum board as reference example 1. Reference example 1 had the same specifications as the comparative example except for the material of the load-bearing surface material.

[0066] On the other hand, in the embodiments, the structures other than the gypsum board containing glass fiber used are the same as the specifications of the comparative example, and in Examples 1 to 6, the surface material widths of the gypsum board containing glass fiber are 225mm, 300mm, 455mm, 600mm, 800mm and 847mm, respectively. Example 4 was experimented with using three gypsum boards and setting the wall width of the load-bearing wall to 1820mm. In addition, in other embodiments, the calculated results were obtained by linear interpolation using the measured values ​​of the comparative example and Examples 4 and 6. In addition, as Reference Example 2, an experiment was also conducted on a test body using two particle boards with a surface material width of 600mm (a structure formed by connecting one in the width direction and two in the longitudinal direction).

[0067] The experimental results and the calculation results are shown in Table 1. Here, regarding the wall ratio ratio, the ratios calculated in Examples 1 to 6 are relative to the wall ratios in the comparative examples, and the ratios calculated in Reference Example 2 are relative to the wall ratios in Reference Example 1. In addition, the five bearing capacity values ​​of the comparative examples, Examples 4 and 6, and Reference Examples 1 and 2 are shown in Table 2.

[0068] [Table 1]

[0069]

[0070] [Table 2]

[0071]

[0072] As shown in Tables 1 and 2, in Reference Example 1 with particleboard (wooden load-bearing surface material), the load-bearing surface material and the load-bearing wall have high toughness, so the bearing capacity value is determined by the yield bearing capacity P y In reference example 2 where the width of the surface material is reduced, the bearing capacity value is determined by the ultimate bearing capacity correction value P u 'It was decided that, although the load-bearing value determination item would change by changing the width of the face material, there would not be a big difference in the wall ratio between the two.

[0073] In contrast, since the comparative example and embodiments 1 to 6 having glass fiber gypsum boards have lower toughness than the wood-based load-bearing surface materials, the bearing capacity values ​​are modified from the ultimate bearing capacity correction value P u 'It was determined that the wall ratio of the embodiment can be increased to 1.16 to 1.98 times relative to the wall ratio of the comparative example (the wall ratio of the inorganic reference load-bearing surface material with a reference width of 910 mm of the surface material width).

[0074] Here, in Example 6 in Table 2, although the yield bearing capacity P y The value is less than the ultimate bearing capacity correction value P u', but the bearing capacity value of Example 6 in Table 1 is corrected by the ultimate bearing capacity value P u 'Decision. This is based on the following reasons. That is, in the evaluation method standards of the designated performance evaluation agency, it is stated as follows: y When the true shear deformation angle is less than 1 / 300 rad and there is no significant damage when the true shear deformation angle is 1 / 300 rad, regardless of the test method, the bearing capacity when the shear deformation angle is 1 / 120 rad is used as the bearing capacity when the true shear deformation angle is 1 / 300 rad. In addition, it is stated as follows: Short-term reference shear bearing capacity P o From the ultimate bearing capacity correction value P u ', Maximum bearing capacity P max The bearing capacity is determined from the three bearing capacity values ​​of 2 / 3 of the actual shear deformation angle and the bearing capacity when the true shear deformation angle is 1 / 300rad. The comparative example and embodiment 6 in Table 2 both belong to the yield displacement δ of the test body. y When the true shear deformation angle is less than 1 / 300 rad and there is no significant damage when the true shear deformation angle is 1 / 300 rad, it is determined by the minimum value of the following three: (2) Ultimate bearing capacity P u Corrected value P of the ultimate bearing capacity based on the plastic modulus μ u ', (3) Maximum bearing capacity P max 2 / 3 of the actual shear deformation angle, (4) the bearing capacity when the actual shear deformation angle is 1 / 300 rad. That is to say, the experimental results of Example 6 are in line with the standard, and the short-term standard shear bearing capacity P o The ultimate bearing capacity correction value P u 'Decide.

[0075] In addition, it has been confirmed that the deformation performance (limit displacement δ u ) compared to 35.64×10 -3 rad, the maximum value increased to 66.7×10 -3 rad.

[0076] That is, by reducing the width of the surface material of the gypsum board containing glass fiber, the toughness is improved, although the bearing capacity value is corrected by the ultimate bearing capacity value P u 'The decision has not changed, but due to the ultimate load capacity correction value P u 'Increases, so the wall ratio is improved.

[0077] Here, the wall ratio of the comparative example was calculated to be about 2.7. Therefore, by multiplying the wall ratio ratio of each example by this value, it was confirmed that the wall ratio of each example was 3.0 or more.

[0078] This verification confirmed that by narrowing the surface width of the gypsum board compared to the conventional surface width, the toughness of the gypsum board and the load-bearing wall having the gypsum board can be improved, and the wall ratio can be improved.

[0079] In addition, it is also possible to combine other components into other embodiments of the structures listed in the above embodiments, and the present invention is not limited to the structures shown here. In this regard, without departing from the gist of the present invention, changes can be made and can be appropriately specified according to its application form.

[0080] This international application claims priority based on Japanese patent application No. 2022-118776 filed on July 26, 2022, the entire contents of which are incorporated herein by reference.

[0081] Description of Reference Numerals

[0082] 10: Strip foundation

[0083] 11: Anchor bolts

[0084] 21: Beam (upper beam)

[0085] 22: Base (lower beam)

[0086] 30: Stringer

[0087] 31: Column (longitudinal beam)

[0088] 32: Column (longitudinal beam)

[0089] 40: Framework

[0090] 50: Load-bearing surface materials (inorganic load-bearing surface materials, gypsum board)

[0091] 60: Nails (fasteners)

[0092] 70: Load-bearing wall.

Claims

1. An inorganic load-bearing surface material, wherein: The width of the load-bearing surface material when viewed from the front is less than 910 mm.

2. The inorganic load-bearing surface material according to claim 1, wherein: The bearing capacity value used when calculating the wall ratio of the load-bearing surface material is determined by the ultimate bearing capacity correction value of the load-bearing surface material corrected based on the plastic modulus among the following four bearing capacities: (1) Yield bearing capacity P y ; (2) Ultimate bearing capacity P u The corrected value of the ultimate bearing capacity based on the plastic modulus μ is P u '(where μ = δ u / δ v , δ u is the limit displacement, δ v is the yield point displacement); (3) Maximum load capacity P max 2 / 3; (4) The bearing capacity when the apparent shear deformation angle is 1 / 120 rad or the bearing capacity when the true shear deformation angle is 1 / 300 rad.

3. The inorganic load-bearing surface material according to claim 1 or 2, wherein: The limit displacement δ related to the shear deformation angle u The upper limit value is 66.7×10 -3 rad.

4. The inorganic load-bearing surface material according to any one of claims 1 to 3, wherein The wall ratio of the inorganic load-bearing surface material to the inorganic reference load-bearing surface material is in the range of 1.16 to 1.98, wherein the inorganic reference load-bearing surface material has a reference width of 910 mm when viewed from the front.

5. The inorganic load-bearing surface material according to any one of claims 1 to 4, wherein The wall ratio is 3.0 or more.

6. The inorganic load-bearing surface material according to any one of claims 1 to 5, wherein The width of the surface material is any one of 225mm, 300mm, 455mm, 600mm, 800mm, and 847mm.

7. The inorganic load-bearing surface material according to any one of claims 1 to 6, wherein The inorganic load-bearing surface material is formed by gypsum board.

8. A load-bearing wall comprising: A frame having a plurality of longitudinal beams, and an upper cross beam and a lower cross beam respectively connecting the upper ends and the lower ends of the plurality of longitudinal beams; as well as The inorganic load-bearing surface material according to any one of claims 1 to 7, which is fixed to the frame by a plurality of fasteners.

9. The load-bearing wall according to claim 8, wherein: The widths of the plurality of load-bearing surface materials are the same.

10. The load-bearing wall according to claim 8, wherein: The plurality of load-bearing surface materials include load-bearing surface materials with the same surface material width and load-bearing surface materials with different surface material widths.

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