Finite element model creation method, creation system, and program

Abstract

To provide a creation method and a creation system of a finite element model, and a program which can make work in creating an FEM model from BIM data efficient.SOLUTION: A creation method of a finite element model includes: a first step S1 of determining whether or not a plurality of members in geometry data produced based on analytic model data are in connection with each other on the basis of a distance between the members and a cross-section size of the members in BIM data and, if determining that the members are in connection with each other, moving the members constituting the geometry data to update the geometry data; and a second step S2 of determining whether or not the members in the geometry data are considered to be on a predetermined reference line on the basis of a position of the reference line in the BIM data and a position and the cross-section size of the members and, if determining that the members are considered to be on the reference line, moving the members constituting the geometry data to update the geometry data.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a finite element model creation method, creation system, and program suitable for creating a finite element model from BIM data. [Background technology]

[0002] Conventionally, a design system that supports the design of a building using a three-dimensional finite element method (FEM) has been known (see, for example, Patent Document 1). One method for creating a three-dimensional FEM model of a building involves acquiring analytical model data from BIM (Building Information Modeling) software (for example, Revit manufactured by AutoDesk), importing the data as geometry (figure) data into finite element modeling / post-processing software (for example, Femap manufactured by Siemens), and creating an FEM model from the geometry data using functions installed in the finite element modeling / post-processing software.

[0003] This method involves first obtaining analytical model data from BIM software, in which floors and walls (surface members) are modeled as surfaces (planes) and beams and columns (line members) as curves (lines), and then importing this data into finite element modeling / post-processing software as geometry data. When importing, information on the thickness of the surface members and the cross-sectional shape and cross-sectional dimensions of the line members is also obtained, and numerical information is assigned to the geometry data. Furthermore, using functions built into the finite element modeling / post-processing software, node position information (element division position) is added to the geometry data, generating the nodes and elements of the FEM model. Figure 6 shows an example of a general flow for creating an FEM model from geometry data using each software. Note that the FEM model generation tool on the left side of the figure typically uses an extended function of the BIM software. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2021-56617 Summary of the Invention [Problem to be solved by the invention]

[0005] However, because the analytical models in BIM software are surfaces and curves without volume, there are gaps equal to the volume at the connections of the components that make up the building, as shown in Figure 5(1), which differs from the connection state of components in a general FEM model, as shown in Figure 5(2).As a result, it is necessary to edit the analytical model data in the BIM software or the geometry data in the imported finite element modeling / post-processing software to process the shape so that it matches the connection state of components in a general FEM model, but in either case the FEM model creator must manually manipulate each component, which is time-consuming and labor-intensive.

[0006] Furthermore, the general modeling position of the elements that make up an FEM model is not the center of thickness as shown in Figure 5(3), but the model creator may rationally align it with the grid line or level position of the drawing depending on the purpose of the analysis and the ease of model creation as shown in Figure 5(4). Even in this case, the analysis model data in the BIM software or the geometry data in the imported finite element modeling / post-processing software must be edited one by one, which is time-consuming and labor-intensive.

[0007] The present invention has been made in consideration of the above, and aims to provide a finite element model creation method, creation system, and program that can improve the efficiency of work when creating an FEM model from BIM data. [Means for solving the problem]

[0008] In order to solve the above-mentioned problems and achieve the object, the method for creating a finite element model of the present invention is a method for creating a three-dimensional finite element model of a building using finite elements based on geometry data generated from BIM data of multiple components that make up the building, and is characterized by having the following steps: a first step of determining whether multiple components in the geometry data generated based on analytical model data in which the multiple components that make up the building are modeled using planar components that have no thickness and line components that have no cross section are connected to each other based on the distance between the components and the cross-sectional dimensions of the components in the BIM data; and if it is determined as a result of this determination that the components are connected, moving at least one of the edges or points of the components that make up the geometry data and updating the geometry data; and a second step of determining whether the component in the geometry data can be considered to be on the reference line based on the position of a predetermined reference line in the BIM data and the position and cross-sectional dimensions of the component; and if it is determined as a result of this determination that the component can be considered to be on the reference line, moving the component that makes up the geometry data and updating the geometry data.

[0009] In addition, the finite element model creation system of the present invention is a system that creates a three-dimensional finite element model of a building using finite elements based on geometry data generated from BIM data of multiple components that make up the building, and is characterized by having: a first means that determines whether multiple components in the geometry data generated based on analytical model data in which the multiple components that make up the building are modeled with surface components that have no thickness and line components that have no cross section are connected based on the distance between the components and the cross-sectional dimensions of the components in the BIM data, and if it is determined as a result of this determination that the components are connected, moves at least one of the edges or points of the components that make up the geometry data and updates the geometry data; and a second means that determines whether the component in the geometry data can be considered to be on the reference line based on the position of a predetermined reference line in the BIM data and the position and cross-sectional dimensions of the component, and if it is determined as a result of this determination that the component can be considered to be on the reference line, moves the component that makes up the geometry data and updates the geometry data.

[0010] In addition, the program of the present invention is a program for creating a three-dimensional finite element model of a building using finite elements, and causes a computer to function as: a means for determining whether multiple components in the geometry data generated based on analytical model data in which the multiple components making up a building are modeled with planar components that have no thickness and line components that have no cross section are connected based on the distance between the components and the cross-sectional dimensions of the components in the BIM data, and if it is determined that the components are connected, moving at least one of the edges or points of the components that make up the geometry data and updating the geometry data; a means for determining whether a component in the geometry data can be considered to be on a reference line based on the position of a predetermined reference line in the BIM data and the position and cross-sectional dimensions of the component, and if it is determined that the component can be considered to be on the reference line, moving the component that makes up the geometry data and updating the geometry data, and is a program for creating a three-dimensional finite element model of a building using finite elements. [Effects of the Invention]

[0011] According to the method for creating a finite element model of the present invention, a three-dimensional finite element model of a building is created using finite elements based on geometry data generated from BIM data of multiple components that make up the building. The method includes the following steps: a first step: determining whether multiple components in the geometry data generated based on analytical model data in which the multiple components that make up the building are modeled using planar components with no thickness and linear components with no cross-section are connected to each other based on the distance between the components and the cross-sectional dimensions of the components in the BIM data; if it is determined that the components are connected, moving at least one of the edges or points of the components that make up the geometry data and updating the geometry data; and a second step: determining whether the component in the geometry data can be considered to be on the reference line based on the position of a predetermined reference line in the BIM data and the position and cross-sectional dimensions of the component; if it is determined that the component can be considered to be on the reference line, moving the component that makes up the geometry data and updating the geometry data. This has the effect of improving the efficiency of the work involved in creating a finite element model from BIM data.

[0012] In addition, according to the finite element model creation system of the present invention, it is a system that creates a three-dimensional finite element model of a building using finite elements based on geometry data generated from BIM data of multiple components that make up the building, and the system determines whether multiple components in the geometry data generated based on analytical model data in which the multiple components that make up the building are modeled with planar components that have no thickness and line components that have no cross section are connected to each other based on the distance between the components in the BIM data and the cross-sectional dimensions of the components, and if it is determined as a result of this determination that the components are connected, it has a first means for moving at least one of the edges or points of the components that make up the geometry data and updating the geometry data, and a second means for determining whether the component in the geometry data can be considered to be on the reference line based on the position of a predetermined reference line in the BIM data and the position and cross-sectional dimensions of the component, and if it is determined as a result of this determination that the component can be considered to be on the reference line, it moves the component that makes up the geometry data and updates the geometry data, thereby achieving the effect of improving the efficiency of the work when creating a finite element model from BIM data.

[0013] Furthermore, according to the program of the present invention, the computer is caused to function as: a means for determining whether or not multiple components in the geometry data generated from BIM data of multiple components that make up a building are connected based on analytical model data in which the multiple components that make up the building are modeled with planar components that have no thickness and line components that have no cross section, based on the distance between the components in the BIM data and the cross-sectional dimensions of the components, and if it is determined that the components are connected as a result of this determination, moving at least one of the edges or points of the components that make up the geometry data and updating the geometry data; a means for determining whether or not a component in the geometry data can be considered to be on a reference line based on the position of a predetermined reference line in the BIM data and the position and cross-sectional dimensions of the component, and if it is determined that the component can be considered to be on the reference line as a result of this determination, moving the component that makes up the geometry data and updating the geometry data; and since it is a program for creating a three-dimensional finite element model in which the building is modeled using finite elements, it has the effect of improving the efficiency of the work involved in creating a finite element model from BIM data. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is an explanatory diagram of a procedure for determining the connection between surfaces in the present invention. [Figure 2] FIG. 2 is an explanatory diagram of the procedure for determining the connection between a surface and a curve in the present invention. [Figure 3] FIG. 3 is an explanatory diagram of the procedure for determining the connections between curves and surfaces, and between curves, in the present invention. [Figure 4] FIG. 4 is an explanatory diagram of a position determination procedure in the present invention. [Figure 5] Figure 5 is an explanatory diagram of conventional model data, where (1) is a component connection diagram of the analysis model data of the BIM software, (2) is a component connection diagram of the FEM model data, (3) is a component location diagram of the analysis model data of the BIM software, and (4) is a component location diagram of the FEM model data. [Figure 6]FIG. 6 is a diagram showing a general flow of creating an FEM model from conventional geometry data. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, embodiments of a finite element model creation method, creation system, and program according to the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to these embodiments.

[0016] The finite element model creation method according to an embodiment of the present invention creates an FEM model (finite element model) by running a program with a determination function based on the following steps S1 (first step) and S2 (second step) for the cross-sectional dimensions and distances of adjacent components in the analysis model of BIM software or the geometry data of finite element modeling / post-processing software on a computer in conjunction with a program equipped with the above-mentioned conventional FEM model creation method. This makes it possible to generate the connection status of components in a typical FEM model without individual manual operations. Note that the part corresponding to A in Figure 6 corresponds to the part applying the determination function based on the method of steps S1 and S2 of this embodiment.

[0017] (Step S1) In step S1, it is determined whether or not the components (geometry data) will connect based on the distance between the geometry data of the finite element modeling / post-processing software created using the analytical model data of the BIM software and the information on the cross-sectional dimensions of the components (first step). More specifically, depending on the combination of the types of components to be connected (surface, curve), it is determined whether or not they will connect using the following methods (a) to (d).

[0018] (a) Procedure for determining surface-to-surface connections Consider the case where two planar components (walls) indicated by dashed lines are modeled as surfaces, as shown in Figure 1(1). First, check whether the length of the vector (i) from the midpoint of the perimeter that constitutes the surface being judged for connection to the closest point on a surface other than the surface being judged (a candidate surface for connection) is within a tolerance (e.g., 3.5 m).

[0019] Next, as shown in FIG. 1(2), it is confirmed whether or not a vector (i) perpendicular to the side of the surface being judged and the normal vector of the surface is not perpendicular to the normal vector (ii) of the connection candidate surface.

[0020] Next, as shown in Figure 1(3), it is confirmed whether the length of vector (i), which is the projection of the vector up to the edge that constitutes the connection candidate surface in the axial direction of the edge of the surface being judged, is within the range of the width of the surface being judged. If the wall is on the same floor as shown in Figure 1(3), it is included in the range of the surface width, but if it is not on the same floor, it is not included in the range of the surface width and is not connected.

[0021] Next, as shown in Figure 1(4), it is confirmed whether the length of vector (i) obtained by projecting the vector from the midpoint of the edge being judged to the closest point on the edge of the connection candidate surface onto the normal vector of the connection candidate surface is within the range of the thickness of the connection candidate surface.

[0022] Next, as shown in Figure 1(5), it is confirmed whether the length of vector (i) obtained by projecting the vector from the midpoint of the edge being determined to the closest point on the edge of the connection candidate surface onto the normal vector of the surface being determined is within the range of the thickness of the surface being determined.

[0023] (b) Procedure for determining the connection between surfaces and curves As shown in Figure 2(1), consider the case where the surface members (walls) shown by dashed lines are modeled as surfaces, and the line members (columns) shown by dashed lines are modeled as curves. First, check whether the length of the vector (i) from the midpoint of the perimeter that constitutes the surface being judged for connection to the closest point on the connection candidate curve is within the tolerance.

[0024] Next, as shown in FIG. 2(2), it is confirmed whether a vector (i) perpendicular to the edge of the surface under determination and the normal vector of the surface under determination is parallel to the axial direction vector (ii) of the connection candidate curve.

[0025] Next, as shown in FIG. 2(3), it is confirmed whether the axial direction vector (i) of the connecting candidate curve is parallel to the axial direction vector (ii) of the side under consideration.

[0026] Next, as shown in Figure 2(4), it is confirmed whether the length of vector (i) obtained by projecting the vector from the midpoint of the edge being judged to the closest point of the connection candidate curve onto the axial direction vector of the edge being judged is within the range of the length of the connection candidate curve.

[0027] Next, as shown in Figure 2(5), it is confirmed whether the length of vector (i) obtained by projecting the vector from the midpoint of the edge being judged to the closest point on the edge of the connection candidate curve onto the coordinate system of the cross section of the connection candidate curve is within the range of the cross section of the connection candidate curve.

[0028] Based on the above procedures (a) and (b), it is determined whether or not each perimeter constituting the surface under connection determination is connected.

[0029] (c) Procedure for determining the connection between curves and surfaces As shown in Figure 3(1), consider the case where the line member (beam) shown by the dashed line is modeled as a curve and the plane member (wall) shown by the dashed line is modeled as a surface. First, it is checked whether the length of the vector (i) from the end point of the curve being judged for connection to the closest point on the connection candidate surface is within the tolerance.

[0030] Next, as shown in Figures 3(1) and 3(2), it is confirmed whether the length of vector (ii), which is the vector from the end point of the curve being judged to the closest point on the connection candidate surface projected onto the normal vector of the connection candidate surface, is within the range of the thickness of the connection candidate surface.

[0031] Next, as shown in FIG. 3(2), it is checked whether or not the vector in the axial direction of the curve under determination intersects with the connection candidate surface.

[0032] (d) Procedure for determining the connection between curves Consider the case where a line member (column, beam) shown by a dashed line is modeled as a curve, as shown in Figure 3(3). First, it is checked whether the length of the vector (i) from the end point of the curve being judged for connection to the closest point on the candidate curve for connection is within the allowable value.

[0033] Next, as shown in Figures 3(4) and (5), it is confirmed whether the length of vector (ii), which is the vector from the end point of the curve being judged to the closest point on the connection candidate curve projected onto the coordinate system of the cross section of the connection candidate curve, is included in the range of the cross section of the connection candidate curve.

[0034] Next, as shown in Figure 3(5), it is confirmed whether the length of vector (i) obtained by projecting the vector from the position where the end point of the curve under evaluation is extended toward the connection candidate curve to the point closest to the connection candidate curve onto the coordinate system of the cross section of the curve under evaluation is included in the range of the cross section of the curve under evaluation.

[0035] Based on the above steps (c) and (d), it is determined whether or not to connect each of the end points of the curve under connection determination.

[0036] If the above judgment results in a connection, the edges or points that make up the geometry data are moved using functions built into the finite element modeling / post-processing software. The reason for checking whether the vector length to the nearest point is within a tolerance at the beginning of the above judgments (a) to (d) is to reduce the processing time for connection judgment by excluding distant components at an early stage. The tolerance (e.g., 3.5 m) is provisionally set based on the assumption that the maximum length of the vector to be judged is approximately 2.5 to 3 m, half the thickness of the foundation slab, since the maximum thickness of the foundation slab is approximately 5 to 6 m.

[0037] (Step S2) In step S2, the second step determines whether or not a component is considered to be on a grid line or level line based on the position of the grid line and level line (reference line) in the BIM software and the position of the component (geometry data). More specifically, the determination is made using the following methods (a) and (b) depending on the component type (surface, curve).

[0038] (a) Surface location determination procedure As shown in Figure 4(1), the direction components (X, Y, Z) for determining the position are determined from the normal direction of the surface (for example, wall) being judged. By comparing the distance from the surface to the grid line / level line and the thickness of the surface (wall), it is determined whether the grid line / level line is included within the thickness of the surface (wall). If the grid line / level line is included within the thickness, it is considered to be on the grid line / level line, and the geometry is moved.

[0039] (b) Curve position determination procedure As shown in Figure 4 (2), the direction components (X, Y, Z) for position determination are determined from the direction of the coordinate system of the cross section of the curve (for example, a pillar) being determined. By comparing the distance from the curve to the grid line / level line and the cross section dimensions of the curve (pillar), it is determined whether the grid line / level line is included within the range of the cross section of the curve (pillar). If the grid line / level line is included within the range of the cross section, it is considered to be on the grid line / level line, and the geometry is moved.

[0040] If the result of the above (a) and (b) is that the geometry is deemed to be on a grid line or level line, a search is made to see if there are any other points that make up the geometry that match the coordinate values of the directional components (X, Y, Z) that determine the position of the geometry being judged, and if so, the geometry being judged is moved onto the grid line or level line together with the geometry being judged.If there are no other points that match the coordinate values, only the geometry being judged is moved.

[0041] According to this embodiment, by utilizing the above-described determination method as a program for processing and editing geometry data in finite element modeling / post-processing software, the following effects can be obtained, and geometry data can be efficiently processed and edited to create an FEM model.

[0042] First, it eliminates the need for FEM model creators to determine whether geometry data in finite element modeling / post-processing software is connected or considered to be on grid lines or level lines. It also eliminates the need for FEM model creators to process or edit geometry data in finite element modeling / post-processing software. Furthermore, by first determining whether the vector distance is within a certain range when determining whether geometry data is connected, it is no longer necessary to process all geometry in the next step, improving the efficiency of program processing. This improves the efficiency of model creation work when creating FEM models from BIM data.

[0043] A finite element model creation system according to an embodiment of the present invention is a system that executes the finite element model creation method according to the above embodiment using a computer. The systematization of step S1 above corresponds to a first means, and the systematization of step S2 corresponds to a second means. According to this embodiment, it is possible to achieve the same effects as those described above.

[0044] Furthermore, a program according to an embodiment of the present invention is a program for creating a finite element model by causing a computer to function as the first means and the second means. According to this embodiment, the same effects as those described above can be achieved.

[0045] As described above, the finite element model creation method of the present invention is a method for creating a three-dimensional finite element model of a building using finite elements based on geometry data generated from BIM data of multiple components that make up the building. The method includes the following steps: a first step: determining whether multiple components in the geometry data generated based on analytical model data in which the multiple components that make up the building are modeled using planar components with no thickness and linear components with no cross-section are connected to each other based on the distance between the components and the cross-sectional dimensions of the components in the BIM data; and if it is determined that the components are connected, moving at least one of the edges or points of the components that make up the geometry data and updating the geometry data; and a second step: determining whether the component in the geometry data can be considered to be on the reference line based on the position of a predetermined reference line in the BIM data, and the position and cross-sectional dimensions of the component; and if it is determined that the component can be considered to be on the reference line, moving the component that makes up the geometry data and updating the geometry data. This method can improve the efficiency of the work involved in creating a finite element model from BIM data.

[0046] In addition, according to the finite element model creation system of the present invention, this system creates a three-dimensional finite element model of a building using finite elements based on geometry data generated from BIM data of multiple components that make up the building. The system determines whether multiple components in the geometry data generated based on analytical model data in which the multiple components that make up the building are modeled with planar components that have no thickness and line components that have no cross section are connected to each other based on the distance between the components and the cross-sectional dimensions of the components in the BIM data. If it is determined that the components are connected as a result of this determination, it moves at least one of the edges or points of the components that make up the geometry data and updates the geometry data. The system also has a first means for determining whether the component in the geometry data can be considered to be on the reference line based on the position of a predetermined reference line in the BIM data and the position and cross-sectional dimensions of the component, and if it is determined that the component can be considered to be on the reference line as a result of this determination, it moves the component that makes up the geometry data and updates the geometry data. This makes it possible to improve the efficiency of the work involved in creating a finite element model from BIM data.

[0047] Furthermore, according to the program of the present invention, the computer uses geometry data generated from BIM data of multiple components that make up a building to determine whether multiple components in the geometry data generated based on analysis model data in which the multiple components that make up the building are modeled with planar components that have no thickness and line components that have no cross section are connected, based on the distance between the components in the BIM data and the cross-sectional dimensions of the components, and if it is determined that the components are connected as a result of this determination, moves at least one of the edges or points of the components that make up the geometry data and updates the geometry data; and determines whether a component in the geometry data can be considered to be on a reference line based on the position of a predetermined reference line in the BIM data and the position and cross-sectional dimensions of the component, and if it is determined that the component can be considered to be on the reference line as a result of this determination, moves the component that makes up the geometry data and updates the geometry data.Since this is a program for creating a three-dimensional finite element model in which the building is modeled using finite elements, it is possible to improve the efficiency of the work involved in creating a finite element model from BIM data. [Industrial Applicability]

[0048] As described above, the finite element model creation method, creation system, and program of the present invention are useful when creating an FEM model from BIM data, and are particularly suitable for improving the efficiency of FEM model creation work.

Claims

1. A method for creating a three-dimensional finite element model of a building using finite elements, based on geometry data generated from BIM data of multiple components that make up the building, by a computer, comprising: The computer a first step of determining whether or not multiple components in geometry data generated based on analysis model data in which multiple components constituting a building are modeled with planar components with no thickness and line components with no cross section are connected based on the distance between the components and the cross-sectional dimensions of the components in the BIM data, and if it is determined that the components are connected as a result of this determination, moving at least one of the edges or points of two components constituting the geometry data that are determined to be connected so that they are connected, thereby updating the geometry data; a second step of determining whether or not a component in the geometry data can be considered to be on the reference line based on the position of a predetermined reference line in the BIM data and the position and cross-sectional dimensions of the component, and if it is determined that the component can be considered to be on the reference line as a result of this determination, moving the component that is determined to be on the reference line among the components that make up the geometry data to the reference line and updating the geometry data; A method for creating a finite element model, comprising:

2. A system for creating a three-dimensional finite element model of a building using finite elements based on geometry data generated from BIM data of multiple components that make up the building, a first means for determining whether or not multiple components in geometry data generated based on analysis model data in which multiple components constituting a building are modeled with planar components that have no thickness and line components that have no cross section are connected based on the distance between the components and the cross-sectional dimensions of the components in the BIM data, and if it is determined that the components are connected as a result of this determination, for updating the geometry data by moving at least one of the edges or points of two components that are determined to be connected among the components constituting the geometry data so that they are connected; A finite element model creation system characterized by having a second means for determining whether a component in the geometry data can be considered to be on a reference line based on the position of a predetermined reference line in the BIM data and the position and cross-sectional dimensions of the component, and if it is determined as a result of this determination that the component can be considered to be on the reference line, moving the component that is determined to be on the reference line from among the components that make up the geometry data to the reference line and updating the geometry data.

3. Using the geometry data generated from the BIM data of the multiple components that make up the building, a means for determining whether or not multiple components in geometry data generated based on analytical model data in which multiple components constituting a building are modeled using planar components with no thickness and linear components with no cross section are connected based on the distance between the components and the cross-sectional dimensions of the components in the BIM data, and if it is determined that the components are connected as a result of this determination, for updating the geometry data by moving at least one of the edges or points of two components determined to be connected among the components constituting the geometry data so that they are connected; A means for determining whether a member in the geometry data can be considered to be on a reference line based on the position of a predetermined reference line in the BIM data and the position and cross-sectional dimensions of the member, and if it is determined as a result of this determination that the member can be considered to be on the reference line, moving the member that is determined to be on the reference line among the members that make up the geometry data to the reference line and updating the geometry data; A program for creating a three-dimensional finite element model of the building using finite elements, which functions as a

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