Ceiling structure and design method for ceiling structure

Abstract

To increase rigidity and strength of a ceiling in an in-plane direction.SOLUTION: A ceiling structure comprises: a suspension material hanging from a superstructure; a ceiling base material suspended from the suspension material and comprising a grid; and a reinforcing wire rod fixed to the ceiling base material. The reinforcing wire rod forms a reference compartment and a continuous compartment provided in succession to the reference compartment in 2 or 3 or 4 directions among front, back, right and left of the reference compartment, which are the compartments having one or more grids.SELECTED DRAWING: Figure 1

Description

Technical Field

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[0001] The present invention relates to a ceiling structure and a method for designing the ceiling structure.

Background Art

[0002] As a ceiling structure, there is known a ceiling (so-called suspended ceiling) in which T-bars suspended by suspension bolts are connected in a grid (lattice) pattern, and ceiling boards and equipment are incorporated within the frame of the grid. For example, Patent Document 1 discloses a suspended ceiling in which equipment and suspension bolts are connected by a reinforcing material to avoid collisions caused by differences in shaking between the two.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a suspended ceiling, since the T-bars are not fastened to the ceiling board or the like, there is a problem that the in-plane rigidity and strength are low. Even in the ceiling structure of Patent Document 1 described above, there is a possibility that the in-plane rigidity and strength of the ceiling alone cannot be increased.

[0005] The present invention has been made in view of such problems, and an object thereof is to increase the in-plane rigidity and strength of the ceiling.

Means for Solving the Problems

[0006] The main invention for achieving the above objective is a ceiling structure comprising: a suspension member hanging from a superstructure; a ceiling base material suspended from the suspension member and constituting a grid; and a reinforcing wire fixed to the ceiling base material, wherein the reinforcing wire forms a section having one or more of the grids, a reference section, and a continuous section provided continuously with respect to the reference section in two, three, or four directions from the front, back, left, and right of the reference section.

[0007] Other features of the present invention will be made clearer by description in this specification and the accompanying drawings. [Effects of the Invention]

[0008] According to the present invention, the rigidity and strength of the ceiling in the in-plane direction can be increased. [Brief explanation of the drawing]

[0009] [Figure 1] This is a schematic plan view of the ceiling structure of this embodiment. [Figure 2] This is a schematic cross-sectional view of the ceiling structure of this embodiment. [Figure 3] This is an explanatory diagram of the T-bar 10 and ceiling board 100. [Figure 4] This is an explanatory diagram of the joint between the T-bar 10 and the reinforcing wire 20. [Figure 5] This is a flowchart illustrating an example of a ceiling structure design method. [Figure 6] Figure 6A shows an example of an extraction point in the ceiling structure. Figure 6B shows the analysis model of the extraction point. Figure 6C shows the analysis results. [Figure 7] Figure 7A shows an analysis model that represents the T-bar 10. Figure 7B shows the analysis results. [Modes for carrying out the invention]

[0010] This specification and the accompanying drawings make it clear at least the following:

[0011] A ceiling structure comprising a suspension member hanging down from an upper structure, a ceiling base material suspended by the suspension member and forming a grid, and a reinforcing wire member fixed to the ceiling base material, wherein the reinforcing wire member forms one or more compartments having the grid, including a reference compartment and continuous compartments provided continuously with the reference compartment in two, three or four directions of the front, rear, left and right of the reference compartment.

[0012] According to such a ceiling structure, the in-plane rigidity and strength of the ceiling can be increased.

[0013] In such a ceiling structure, it is desirable that the compartment is composed of a plurality of the grids.

[0014] According to such a ceiling structure, reinforcement can be efficiently performed.

[0015] In such a ceiling structure, it is desirable that the reinforcing wire member is disposed above the ceiling base material.

[0016] According to such a ceiling structure, the ceiling base material can support the reinforcing wire member.

[0017] In such a ceiling structure, a vertical gap is provided between the reinforcing wire member and the ceiling base material, and it is desirable that the gap is larger than the thickness of the ceiling material attached to the grid.

[0018] According to such a ceiling structure, since the ceiling material can be disposed in the gap portion, the work becomes easy during maintenance etc.

[0019] In such a ceiling structure, it is desirable that diagonal members are provided inside the continuous compartment.

[0020] According to such a ceiling structure, the in-plane rigidity and strength of the ceiling can be further increased.

[0021] In such a ceiling structure, it is desirable that the diagonal members be positioned above the reinforcing wires.

[0022] This type of ceiling structure allows lighting fixtures, air conditioning equipment, and other components to be placed in continuous sections without interfering with the diagonal bracing.

[0023] In such a ceiling structure, it is desirable that a damping member be provided in the reference section.

[0024] This type of ceiling structure allows for improved vibration damping performance in the standard compartment and suppression of deformation.

[0025] In such a ceiling structure, it is desirable that a reinforcing frame is provided below the superstructure in the reference section, and that the damping member is provided between the reinforcing frame and the reinforcing wire.

[0026] This type of ceiling structure can further suppress deformation.

[0027] A ceiling structure design method comprising: a suspension member hanging from a superstructure; a ceiling base material suspended by the suspension member and constituting a grid; and a section having one or more grids, wherein a reference section and a continuous section provided continuously with the reference section in two, three, or four directions from the front, back, left, and right of the reference section, the method comprising: performing a static analysis of the reinforcing wire using an analytical model that models the reinforcing wire to derive the stress and deformation occurring at the joint between the ceiling base material and the reinforcing wire when a horizontal force is applied to the ceiling; and confirming whether the results of the static analysis satisfy the target performance.

[0028] This ceiling structure design method allows for, for example, determining the deformation of reinforcing wires and the forces generated at joints during an earthquake, and confirming whether or not conditions are met.

[0029] In the design method for such a ceiling structure, it is desirable that the horizontal force be derived from the ceiling acceleration determined based on the time history response analysis of the ceiling or a notification or the like.

[0030] This ceiling structure design method allows for the application of horizontal forces appropriate to the ceiling structure.

[0031] A ceiling structure design method that further includes the step of performing an analysis modeling the ceiling substrate material in areas other than the reference section and the continuous section, and confirming the effectiveness of the reinforcing wires.

[0032] This ceiling structure design method allows us to confirm that in-plane rigidity and strength are improved by the reinforcing wires, even in areas far from the partitions (reinforcing wires).

[0033] The following describes one embodiment of the present invention with reference to the drawings.

[0034] ===Execution=== <Regarding the ceiling structure> Figure 1 is a schematic plan view of the ceiling structure of this embodiment, which corresponds to a so-called floor plan. Figure 2 is a schematic cross-sectional view of the ceiling structure of this embodiment. In this embodiment, as shown in Figures 1 and 2, three mutually orthogonal directions (up / down, front / back, and left / right directions) are defined. The up / down direction is the vertical direction, with the upper side in the vertical direction being referred to as "up" and the lower side in the vertical direction being referred to as "down". The front / back and left / right directions are the horizontal directions. Figure 3 is an explanatory diagram of the T-bar 10 and the ceiling board 100. In Figure 3, for convenience, the illustration of reinforcing wires 20, etc., is omitted.

[0035] The ceiling structure of this embodiment is a type of suspended ceiling (specifically, a system ceiling) and is equipped with suspension bolts 4, T-bars 10, reinforcing wires 20, turnbuckles 30, reinforcing frames 40, and dampers 50.

[0036] The suspension bolts 4 (corresponding to the suspension members) are made of steel rod-shaped members and hang down from the upper structure 2, which is the upper frame, as shown in Figure 2. Although not shown in Figure 1, the suspension bolts 4 are also provided at the vertical and horizontal joints of the grid 12 and are arranged at equal intervals in the front-to-back and left-to-right directions. Specifically, the suspension bolts 4 are provided every two grids (2 grids) of the grid 12 formed by the T-bars 10, which will be described later.

[0037] Therefore, if the length of one side of grid 12 in Figure 1 is a (for example, 640 mm), the spacing of the suspension bolts 4 will be 2a (for example, 1280 mm), as shown in Figure 2. Note that the relationship between grid 12 and suspension bolts 4 is not limited to the above. For example, the length of one side a of grid 12 may be 600 mm. In this case, the spacing of the suspension bolts 4 will be 1200 mm. Also, suspension bolts 4 may be provided every 3 grids.

[0038] The T-bars 10 (corresponding to the ceiling base material) are metal members (for example, made of aluminum alloy) suspended by suspension bolts 4, and are arranged along the front-to-back and left-to-right directions, respectively, forming multiple grids 12. As shown in Figure 3, the cross-section of the T-bars 10 is inverted T-shape, and in each grid 12, ceiling boards 100 and equipment (lighting fixtures, air conditioning equipment, sound equipment, etc.) are placed on top of the lower ends of the T-bars 10.

[0039] More specifically, the ceiling board 100 has its upper part in the thickness direction (here, the vertical direction) protruding outwards on its perimeter (side), and this protruding part is positioned above the lower end (inverted T-shape) of the T-bar 10. Therefore, for example, if the ceiling board 100 is pushed upwards from below, the ceiling board 100 will lift up.

[0040] Thus, in a system ceiling, the T-bar 10 is not tightly connected to the ceiling board 100. Therefore, the T-bar 10 alone has the problem of having low rigidity and strength in the in-plane direction. In this embodiment, however, as will be described later, reinforcing wires 20 and turnbuckles 30 are provided to improve the rigidity and strength of the ceiling in the in-plane direction. Rigidity (N / mm) is a value that indicates the resistance to deformation (hardness) against forces such as bending. Strength (N) is a value that indicates how much force can be withstood (strength).

[0041] The reinforcing wire 20 is a rod-shaped member made of metal (for example, aluminum alloy), fixed to the T-bar 10, and positioned along the T-bar 10 (grid 12). The reinforcing wire 20 and the T-bar 10 are joined at the structural plane of the suspension bolt 4. Details of the joint between the T-bar 10 and the reinforcing wire 20 will be described later.

[0042] Furthermore, the reinforcing wires 20 form sections (sections D1, D2) having multiple (in this case, four (or two)) grids 12.

[0043] Section D1 is a section equipped with a reinforcing frame 40 and a damper 50 (described later). Section D2 is a section that is continuous with section D1, starting from section D1 and extending in the front, back, left, and right directions. In this embodiment, section D2 is continuous with section D1 in the front, back, left, and right directions (four directions), but is not limited to this. For example, if section D1 is located at a corner of the ceiling, it is provided continuously in two of the front, back, left, and right directions. Also, if section D1 is located at an edge of the ceiling, it is provided continuously in three of the front, back, left, and right directions. In this embodiment, section D1 corresponds to a base section, and section D2 corresponds to a continuous section.

[0044] As shown in Figure 1, the turnbuckle 30 (corresponding to a diagonal member) is a member provided diagonally in the front-rear and left-right directions within the compartment D2 formed by the reinforcing wire 20. In this embodiment, the turnbuckle 30 is arranged (in an X shape) inside the compartment D2. The turnbuckle 30 is joined to the reinforcing wire 20 by bolts (not shown) or the like.

[0045] Furthermore, as shown in Figure 2, the turnbuckle 30 is positioned above the reinforcing wire 20. This makes it possible to suppress interference with the turnbuckle 30 when, for example, lighting equipment or air conditioning equipment is placed in section D2.

[0046] In this embodiment, the turnbuckle 30 is provided in an X shape in section D2, but only one of them may be provided (it does not have to be in an X shape). Also, the turnbuckle 30 may not be provided in section D2 at all. In these cases as well, the reinforcing wire 20 can increase the rigidity and strength of the ceiling in the in-plane direction. However, providing the turnbuckle 30 in an X shape in section D2, as in this embodiment, can further increase the rigidity and strength of the ceiling in the in-plane direction.

[0047] The reinforcing frame 40 is a highly rigid member made of steel and is attached to the lower end of the superstructure 2 in section D1. In plan view, the reinforcing frame 40 is arranged, for example, along each side of section D1 (in a rectangular shape).

[0048] The damper 50 (corresponding to a damping member) is a device that absorbs vibration energy and dampens vibrations. In this embodiment, a rotary damper that exerts a control force in the rotational direction is used as the damper 50. In section D1, multiple dampers 50 (rotary dampers) are provided around the reinforcing frame 40. As a result, section D1 has high vibration damping performance and is less susceptible to rotational deformation.

[0049] Furthermore, the damper 50 is provided between the reinforcing frame 40 and the reinforcing wire 20. More specifically, a damper lower plate (not shown) is provided on the reinforcing wire 20 of section D1, and the damper 50 is connected between the damper lower plate and the reinforcing frame 40.

[0050] Note that the damper 50 is not limited to a rotary damper. For example, an oil damper or a friction damper may be used, or a combination of these dampers may be used.

[0051] <Regarding the joining of the T-bar 10 and the reinforcing wire 20> FIG. 4 is an explanatory diagram showing an example of the joint portion between the T-bar 10 and the reinforcing wire 20. For the joint between the T-bar 10 and the reinforcing wire 20, a joining bracket 70 is used.

[0052] In the figure, a pair (here, a pair on the left and right) of joining brackets 70 is used. The pair of joining brackets 70 is joined to the T-bar 10 by bolts 72a and nuts 72b in a state of sandwiching the T-bar 10. Also, each of the pair of joining brackets 70 is joined to the reinforcing wire 20 by a bolt 74. Thereby, the reinforcing wire 20 is fixed to the T-bar 10. Note that in the present embodiment, a pair (two) of joining brackets 70 is provided, but it is not limited to this, and one on one side (for example, only the left side in FIG. 4) may be used. Also, as shown in FIG. 4 (and FIG. 2), the reinforcing wire 20 is provided above the T-bar 10, and the weight of the reinforcing wire 20 is supported by the T-bar 10.

[0053] Note that the dashed line shown for the reinforcing wire 20 in FIG. 3 indicates a reinforcing wire 20 orthogonal to the reinforcing wire 20 shown by the solid line (the reinforcing wire 20 parallel to the T-bar 10 sandwiched by the joining bracket 70 in the same figure). As shown in the figure, the reinforcing wire 20 is provided at a position slightly deviated from the T-bar 10 (for example, inside the grid 12). For example, when one side a of the grid 12 is 640 mm and it is shifted 45 mm inward on one side, the center-to-center distance between the two parallel reinforcing wires 20 is 1280 - (45×2) = 1190 mm. Thus, by shifting the position of the reinforcing wire 20 from the T-bar 10, the reinforcing wire 20 can be arranged avoiding the suspension bolt 4 connected to the T-bar 10.

[0054] Furthermore, as shown in Figure 4, a gap s is formed in the vertical direction between the upper end of the T-bar 10 and the lower end of the reinforcing wire 20. It is desirable that this gap s be larger than the thickness d of the ceiling board 100. In this embodiment, the gap s is 20 mm and the thickness d of the ceiling board 100 is 15 mm. This makes it possible to lift the ceiling board 100 and move it into the gap s, which facilitates work, for example, when performing maintenance.

[0055] As described above, in this embodiment, reinforcing wires 20 are provided on the T-bar 10, and the reinforcing wires 20 form sections (sections D1, D2) having four (or two) grids 12. This increases the rigidity and strength of the system ceiling in the in-plane direction and suppresses deformation. In particular, in this embodiment, as shown in Figure 1, sections D2 that are continuous with section D1 are provided in the four directions (front, back, left, and right) of section D1, where the reinforcing frame 40 and dampers 50 are provided, so the rigidity and strength of the system ceiling in the in-plane direction can be efficiently increased.

[0056] <Ceiling Structure Design Method> Next, the design method for the ceiling structure of this embodiment will be described. Figure 5 is a flowchart showing an example of a ceiling structure design method. In the following explanation, the left-right direction is also referred to as the x-direction, the front-back direction as the y-direction, and the up-down direction as the z-direction.

[0057] First, assumptions are made regarding the specifications of the ceiling (S01). For example, settings are made for the ceiling specifications (length of each part, center of gravity, area, etc.), clearance from the walls, and placement of air conditioners.

[0058] Next, the reinforcing frame 40 is analyzed (S02). Here, the suspension strength, horizontal stiffness, and horizontal load-bearing capacity of the reinforcing frame 40 are confirmed. The suspension strength is calculated by applying a load to the lower end of the reinforcing frame 40 and calculating the force acting on the suspension point. Regarding horizontal stiffness, for example, an arbitrary nodal load is applied to the lower end of the reinforcing frame 40 and the average value of the displacement of the frame 40 is calculated.

[0059] Next, the displacement, acceleration, damper force, etc., are derived by time history response analysis of the ceiling (S03). While a detailed explanation is omitted here, the time history response analysis of the "vibration-damping ceiling" is performed by solving the equations of motion for the "ceiling," "air conditioner," and "damper." Note that, as will be discussed later, in the case of earthquake-resistant ceilings, the ceiling acceleration specified by official notices, etc., may be used.

[0060] Next, static analysis of the ceiling reinforcement members (reinforcement wires 20, turnbuckles 30) is performed to derive the stresses and deformations acting on the various components of the ceiling reinforcement members (S04). This analysis is performed by fixing the reinforcement frame 40 section (section D1) and applying the maximum value of the horizontal force acting on the "ceiling" obtained by time history response analysis, etc. The analysis is performed in both the left-right direction (x direction) and the front-back direction (y direction). However, it is not necessary to model all of the ceiling reinforcement members, and for reasons such as symmetry, parts where the stress state is similar or parts that are clearly on the safe side may be omitted and only a part may be extracted. For example, if the configuration in the x direction and the y direction are the same, a part of either the x direction or the y direction may be extracted. Below, an example of extracting a part along the x direction and performing an analysis of excitation in the y direction will be described.

[0061] Figure 6A shows an example of an extracted section in the ceiling structure. Here, the area (enclosed by the dashed line) containing section D1, where the reinforcing frame 40 is provided, and section D2, which is continuous in the x-direction, is extracted from the ceiling structure of Figure 1. The rounded corners of each section in the figure indicate the joints between the reinforcing wires 20 and the T-bars 10. The dashed lines along the y-direction in Figure 6A indicate the areas controlled by each joint (the joints between the reinforcing wires 20 and the T-bars 10).

[0062] Figure 6B shows the analysis model of the extracted section. As shown in Figure 6B, the ceiling reinforcement members (reinforcement wires 20 and turnbuckles 30) are modeled as wire models, and the seismic force generated at the joint with the T-bar 10 is applied as a nodal load. The nodal load is determined by multiplying the maximum acceleration in the time history response analysis of the ceiling by the ceiling mass borne by each joint (ceiling mass in the area demarcated by the dashed line).

[0063] Figure 6C shows an example of the analysis results. The figure shows a modified example when the vibration is applied in the y direction. Based on these analysis results, the deformation of the ceiling reinforcement material during an earthquake and the forces generated in the various members and joints of the ceiling reinforcement material (for example, the parts circled in Figure 6A) are determined, and it is confirmed whether the target performance is met (i.e., within the criteria) (S05). For example, it is confirmed whether the following performances are met. Maximum deformation of ceiling, damper, and wall × safety factor ≤ clearance between ceiling and surrounding walls, etc. Force and stress occurring in each member and joint × safety factor ≤ Allowable stress and yield strength of the same member and joint

[0064] Next, the effectiveness of the ceiling reinforcement is confirmed by an analysis modeling the T-bar 10 (S06). Specifically, in areas where ceiling reinforcement is absent (areas other than sections D1 and D2), it is confirmed that the in-plane stiffness and strength are improved by the ceiling reinforcement located at a distance.

[0065] Figure 7A shows an example of an analytical model that models the T-bar 10. Figure 7A is a model of the area adjacent to section D2 in both the x and y directions (specifically, the reinforcing wires 20 and turnbuckles 30 are placed at the left end and bottom end). Note that while Figure 7A is a 2.5 × 2.5 span area in the example in Figure 6, the analytical model uses a larger planar dimension of 5 × 5 spans (1 span = 1280 mm). Here, suspension bolts 4 are placed at each point of the grid.

[0066] As shown in Figure 7A, the T-bar 10 and suspension bolt 4 on the structural plane of the suspension bolt 4 are modeled, and the joints with the ceiling reinforcement (reinforcement wires 20, turnbuckles 30) and the suspension points of the suspension bolt 4 are fixed supports. In addition, the joints between the T-bars 10 are pin joints. Then, as shown in the figure, nodal loads are applied in the horizontal direction.

[0067] Figure 7B shows an example of the analysis results. From the figure, it can be seen that no overall buckling occurs, and buckling occurs at one point on the T-bar 10 in the plane of the suspension bolt 4. The buckling load is 897N. This is equal to the Euler buckling load when both ends of the T-bar 10, which is spaced 1280mm apart, are pinned, confirming that overall buckling is suppressed by the suspension bolt 4. Furthermore, since the second moment of area of ​​the T-bar 10 about the strong axis in the vertical direction is sufficiently larger than the second moment of area about the weak axis in the plane, it is considered that in-plane buckling is dominant and overall buckling does not occur. Based on the above, even for ceilings with a wide area, it is sufficient to consider the buckling of the T-bar 10 with both ends pinned.

[0068] Note that steps S01 to S05 in Figure 5 need to be performed individually for each property, but step S06 is a general check and therefore does not need to be performed for each property.

[0069] ===Regarding other embodiments=== The embodiments described above are provided to facilitate understanding of the present invention and are not intended to limit its interpretation. The present invention can be modified and improved without departing from its spirit, and it goes without saying that equivalents thereof are included. In particular, embodiments described below are also included in the present invention.

[0070] In the above-described embodiment, a reinforcing frame 40 and a damper 50 were provided in section D1, but it is not necessary to provide a reinforcing frame 40 and a damper 50 in section D1. Even in this case, by providing the reinforcing wire 20 (forming a section), the rigidity and strength in the in-plane direction can be increased compared to the case with only the T-bar 10. Alternatively, seismic braces may be provided instead of the reinforcing frame 40 and damper 50 (i.e., a seismic ceiling may also be provided).

[0071] In the embodiment described above, the design method for a "vibration-damping ceiling" was explained, but in the case of an "earthquake-resistant ceiling," in step S02 of Figure 5, the allowable stress and strength of the earthquake-resistant brace specified by the manufacturer are confirmed. Also, in setting the ceiling acceleration in step S03, formulas specified in notifications, etc., may be used (time history response analysis may also be used, similar to vibration-damping ceilings). For example, 2.2G from the specification route may be adopted, or the acceleration may be determined in detail using the classification and calculation formulas specified in the calculation route. Then, in step S04, the horizontal force obtained from the ceiling acceleration is applied to the ceiling and a static analysis is performed.

[0072] Furthermore, in the above-described embodiment, the sections (sections D1, D2) formed by the reinforcing wires 20 had multiple (for example, four) grids 12, but they may also have only one grid 12. However, configuring the sections to have multiple grids 12 (i.e., installing the reinforcing wires 20) as in this embodiment allows for efficient reinforcement. [Explanation of symbols]

[0073] 2 Superstructure 4. Suspension bolts (suspension materials) 10 T-bar (ceiling underlayment material) 12 grid 20 Reinforcement wires 30 Turnbuckles (diagonal braces) 40 Reinforcement Frame 50 Damper (damping component) 70 Connecting brackets 72a Bolt 72b Nut 74 volts 100 Ceiling boards (ceiling material) D1 Lot (Standard Lot) D2 section (continuous section)

Claims

1. Suspension members hanging from the superstructure, The ceiling base material, suspended from the aforementioned suspension member and forming a grid, Reinforcing wires fixed to the aforementioned ceiling substrate, Equipped with, The reinforcing wires form a section having one or more grids, comprising a base section and continuous sections provided continuously with respect to the base section in two, three, or four directions (front, back, left, or right) of the base section. A ceiling structure characterized by the following features.

2. The ceiling structure according to claim 1, The aforementioned section is composed of a plurality of the aforementioned grids, A ceiling structure characterized by the following features.

3. The ceiling structure according to claim 1, The reinforcing wire is positioned above the ceiling base material. A ceiling structure characterized by the following features.

4. The ceiling structure according to claim 3, A vertical gap is provided between the reinforcing wire and the ceiling substrate material. The gap is larger than the thickness of the ceiling material attached to the grid. A ceiling structure characterized by the following features.

5. The ceiling structure according to claim 4, A diagonal member is provided inside the aforementioned continuous section. A ceiling structure characterized by the following features.

6. The ceiling structure according to claim 5, The diagonal member is positioned above the reinforcing wire. A ceiling structure characterized by the following features.

7. A ceiling structure according to any one of claims 1 to 6, A damping member is provided in the aforementioned reference section. A ceiling structure characterized by the following features.

8. The ceiling structure according to claim 7, The aforementioned reference section is provided with a reinforcing frame below the superstructure. The damping member is provided between the reinforcing frame and the reinforcing wire. A ceiling structure characterized by the following features.

9. A method for designing a ceiling structure comprising: a suspension member hanging from a superstructure; a ceiling base material suspended by the suspension member and constituting a grid; and a section having one or more grids, wherein a reference section and a continuous section provided continuously with the reference section in two, three, or four directions among the front, back, left, and right of the reference section, the method for designing a ceiling structure comprising: The steps include: performing a static analysis of the reinforcing wire using an analytical model that models the reinforcing wire, and deriving the stress and deformation that occur at the joint between the ceiling substrate and the reinforcing wire when a horizontal force is applied to the ceiling; The steps include confirming whether the results of the static analysis satisfy the target performance, A design method for a ceiling structure having the following characteristics.

10. A method for designing a ceiling structure according to claim 9, The aforementioned horizontal force is derived from the ceiling acceleration determined based on the time history response analysis of the ceiling or the notification, etc. A ceiling structure design method characterized by the following features.

11. A method for designing a ceiling structure according to claim 9 or claim 10, A method for designing a ceiling structure, further comprising the step of performing an analysis that models the ceiling substrate material in areas other than the reference section and the continuous section, and confirming the effectiveness of the reinforcing wire.

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