JP2012160012A - Mesh preparation device and structural analysis apparatus, method of the same, program and recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mesh preparation device capable of suppressing the generation of fine beam elements.SOLUTION: A mesh preparation device comprises: element division means which performs collectively the element division of a ground model and a numerical computational beam model of a structure buried in ground based on the information defining an element division method of the numerical computational ground model of the ground; and beam element regeneration means which deletes beam element groups (<30>, etc.) generated between mesh nodes and structure nodes and beam element groups (<31>, etc.) generated between the mesh nodes, from mesh nodes (a white dot of 1017, etc.) generated on the beam model by the element division means and mesh beam element groups generated based on the structure nodes (a black dot of 109, etc.) generated on the beam model by means different from the element division means, and which regenerates the beam elements between the structure nodes (between 109 and 110, between 110 and 15) where the beam elements are extinguished by deleting both the beam element groups.

Description

  The present invention relates to a mesh creation technique for dividing an element of a ground model for numerical calculation of the ground and a beam model for numerical calculation of a structure embedded in the ground, and a structure analysis technique using the mesh preparation technique.

  As a technique for analysis by the finite element method (FEM), as seen in Patent Documents 1 and 2, etc., a technique for automatically generating a mesh on a model and automatically processing from modeling to analysis processing is known. It has been.

  The applicant is a system that automatically processes everything from modeling to analysis processing on a computer. For example, seismic design that automatically calculates the strength analysis of a structure embedded in the ground (hereinafter referred to as “underground structure”) Support system “GALKINS (registered trademark)” is provided.

Japanese Patent No. 3143696 Japanese Patent No. 3516129

  FIG. 1 is a flowchart showing an example of a flow from modeling to analysis processing in the seismic design support system. First, conditions are set for performing seismic design (step S10). For example, selection of the seismic design method, loading direction, ground definition information for generating a ground model in the ground numerical calculation, setting of seismic waves, and the like are performed via the input device. The ground definition information includes, for example, the number of formations and soil property information. Next, the underground structure is defined (step S20). The underground structure is not limited to being entirely buried in the ground, but a part of the underground structure may be exposed on the ground surface.

  FIG. 2 is an example of a screen displayed when the definition information defining the shape of the underground structure is input. The underground structure shown in FIG. 2 is a rectangular structure between two layers and four diameters. Specific examples of the multi-diameter rectangular structure include a water tank having a pond-like structure embedded in a pumping / drainage station of a river facility or a water and sewage facility. A rectangular structure (including a rectangular structure having one layer or one diameter) between multiple multi-diameters can be modeled by a structural model (beam model) of a ramen structure composed of beam elements. Therefore, for example, when the structure definition information such as the height and width of the rectangular structure, the number of divisions in the horizontal and vertical directions, the dimension between the span and the interlayer is input through the input device, FIG. As shown, the seismic design support system divides the defined rectangular structure into a plurality of beam members b1 to b22 that are constituent members thereof. And, for example, the seismic design support system inputs beam member definition information such as cross-sectional shape, rigid zone length, haunch shape, and pile position for each end and intermediate portion of the beam members b1 to b22. By inputting via the apparatus, the structure node and the structure beam element are automatically generated on the beam model (step S14 in FIG. 1).

  FIG. 3 is a screen example in which a structure node and a structure beam element are superimposed and displayed on a beam model of a rectangular structure between two layers and four diameters generated based on the structure definition information. In FIG. 3, ● represents a structure node, and a line segment connecting adjacent structure nodes ● on the beam member represents a structure beam element. The number displayed in the vicinity of the structure node ● is a node number for distinguishing each structure node.

  On the other hand, the element division method of the ground model in the numerical calculation of the ground is also defined (step S16 in FIG. 1). For example, information such as the mesh division pitch is input via the input device as element division method definition information. Based on the definition information of the element dividing method, the seismic design support system divides the ground model and the beam model of the underground structure into elements in a grid pattern as shown in FIG. 4 (step S18 in FIG. 1). ). This is because the calculation process can be sped up by separating the ground model and the beam model and dividing each element into elements instead of dividing both models together. In FIG. 4, the vertical direction represents the depth direction of the ground, and the position of the 0.0 scale on the vertical axis represents the position of the ground surface. Then, the seismic design support system analyzes the strength of the underground structure based on the set of elements generated in both the ground model and the beam model by the element division, and outputs the analysis result (step of FIG. 1). S20).

  However, when both the ground model and the beam model are divided into elements, mesh nodes that are not necessary for the beam members inside the underground structure are generated as shown in FIG.

  FIG. 5 is an enlarged view of a part of the mesh display screen of FIG. In FIG. 5, b1 and the like represent beam members, ● represents the structure node generated in step S14 in FIG. 1, and ◯ represents the mesh node generated in step S18 in FIG. When both the ground model and beam model are divided into elements according to the definition information of the element division method, nodes (that is, mesh nodes ○) are also placed between the structure nodes ● and ● as shown in FIG. Since the beam model is automatically generated, each beam member such as b1 is further subdivided into short beam elements. If the beam member is subdivided into more than necessary beam elements, there is a problem that the analysis accuracy and calculation speed of the structural analysis are lowered.

  Therefore, an object of the present invention is to provide a mesh creation device and a structural analysis device, and a method, a program, and a recording medium that can suppress the generation of fine beam elements.

In order to achieve the above object, the mesh creation device according to the present invention is:
An element dividing unit for dividing the ground model and the numerical beam model of the structure embedded in the ground together into elements based on information defining a ground model element dividing method for the ground numerical calculation; ,
From among mesh beam element groups generated based on the mesh nodes generated toward the beam model by the element dividing means and the structure nodes generated in the beam model by means different from the element dividing means. The first beam element group generated between the mesh node and the structure node and the second beam element group generated between the mesh nodes are deleted, and both beam element groups are deleted. Beam element regeneration means for regenerating beam elements is provided between the structure nodes where the beam elements have disappeared.

In order to achieve the above object, the structural analysis apparatus according to the present invention is:
The mesh creation device;
The beam elements remaining between the structure nodes by deleting both beam element groups from the mesh beam element group, and the beam elements regenerated by the beam element regenerating means, An analysis means for analyzing the strength of the structure is provided.

  Further, as another aspect of the mesh creation device and the structure analysis device, a mesh creation method and a structure analysis method, a mesh creation program and a structure analysis program, and a computer-readable recording medium on which the program is recorded can be cited.

  According to the present invention, generation of fine beam elements can be suppressed.

It is the flowchart which showed an example of the flow from modeling to an analysis process in a seismic design support system. It is an example of a screen displayed when the definition information which defined the shape of the underground structure is input. It is an example of a screen in which automatically generated structure nodes and structure beam elements are superimposed and displayed on a beam model of a rectangular structure between two layers and four diameters generated based on structure definition information. It is an example of a screen in which a ground model and a beam model of an underground structure are displayed together as a mesh. It is the figure which expanded a part of mesh display screen of FIG. It is a hardware block diagram of the structure analysis apparatus 10 which is one Embodiment of this invention. 2 is a functional block diagram of the structure analysis apparatus 10. FIG. It is the figure which expanded a part of display screen of the structure model figure of FIG. It is an example of the node data stored in a storage device. It is an example of structural beam element data stored in a storage device. It is an example of the input screen of element division definition information. It is an example of the mesh beam element data stored in a storage device. This is a processing flow performed by the element dividing unit 302 and the beam element regenerating unit 303. It is explanatory drawing of regeneration of a beam element. It is the mesh display figure which provided the unnecessary node deletion menu in a structure.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. FIG. 6 is a hardware configuration diagram of the structural analysis apparatus 10 according to an embodiment of the present invention. The structural analysis device 10 includes a CPU 101, a ROM (Read Only Memory) 102, a RAM (Random Access Memory) 103, an auxiliary storage device 104, a recording medium reading device 105, an input device 106, a display device 107, and a communication device 108. It is.

  The CPU 101 is composed of a microprocessor and its peripheral circuits, and is a circuit that controls the entire apparatus. The ROM 102 is a memory that stores a predetermined control program (software component) executed by the CPU 101. The RAM 103 executes various control operations by the CPU 101 executing a predetermined control program (software component) stored in the ROM 102. This is a memory used as a work area (work area) when performing.

  The auxiliary storage device 104 is a device for storing various information including a general-purpose OS (Operating System) and programs, and an HDD (Hard Disk Drive), which is a nonvolatile storage device, is used.

  In addition to the auxiliary storage device 104, the various types of information are stored in various recording media such as portable media such as a CD-ROM (Compact Disk-ROM), DVD (Digital Versatile Disk), and USB memory, and other media. The various information stored in the recording medium 109 can be read via a drive device such as the recording medium reading device 105.

  The input device 106 is a device for the user to perform various input operations. The input device 106 includes a mouse, a keyboard, a touch panel switch provided so as to be superimposed on the display screen of the display device 107, and the like. The display device 107 is a device that displays various data on a display screen. For example, it is composed of LCD (Liquid Crystal Display), CRT (Cathode Ray Tube) and the like.

  The communication device 108 is a device that communicates with other devices via a network. Supports communication according to various network forms including wired and wireless networks.

  FIG. 7 is a functional block diagram of the structural analysis apparatus 10. The structure analysis apparatus 10 includes a structure node generation unit 301, an element division unit 302, a beam element regeneration unit 303, and an analysis unit 304. The structure node generation unit 301, the element division unit 302, and the beam element regeneration unit 303 function as a mesh creation device. The analysis unit 304 analyzes the strength of the underground structure based on the mesh created by the mesh creation device in accordance with the seismic design method such as the FEM response seismic intensity method, and outputs the analysis result. Each unit is realized by a program processed by the CPU 101. Each part will be described below.

(About the structure node generation unit 301)
The structure node generation unit 301 is means for generating a structure node in the beam model of the underground structure based on the input information from the input device 106. The structure node generated by the structure node generation unit 301 is displayed on the display device 107 as shown in FIG.

  FIG. 8 is an enlarged view of a part of the display screen of the structure model diagram of FIG. The structure node generation unit 301 automatically calculates an appropriate position of the structure node for the input information based on the input information such as the structure definition information and the beam member definition information. Generate and display structure nodes at positions. The structure definition information includes the height and width of the rectangular structure, the number of horizontal and vertical divisions, the span and interlayer dimensions, and the beam member definition information includes the cross-sectional shape and rigid zone length. , The position of the haunch, the point where the cross-sectional shape changes (cross-sectional change point), the position of the pile, and the like. The structure node generation unit 301 may generate the structure node at the position when the position information of the structure node is directly input from the input device 106. The input position information can be specified by, for example, coordinate information of a pointer (cursor) or a coordinate numerical value input.

  For example, the structure node generation unit 301 generates “outer nodes” at the four corners of the rectangular portion as the first structure node group based on the outer dimensions of the rectangular structure input as the structure definition information. Number 1 to 4 node numbers. When a continuous wall is formed in the underground structure, an external node is generated as a first structure node group at the end of the continuous wall, and a one-digit node number after No. 5 is assigned. . In FIG. 8, the external node with node number 1 is displayed.

  In addition, the structure node generation unit 301 adds “layer / layer” to the horizontal and vertical division positions (excluding the four corners of the rectangular portion) based on the span and interlayer dimensions input as the structure definition information. The "span node" is generated as a second structure node group, and a two-digit node number after 11 is assigned. In FIG. 8, a plurality of layer / span nodes such as node number 11 are displayed.

  In addition, the structure node generation unit 301 generates a “section node” as a third structure node group at the position based on the rigid region position or the cross-sectional shape change position of the beam member input as the beam member definition information. Then, the node numbers of 101 and subsequent three digits are numbered. In FIG. 8, a plurality of cross-sectional nodes such as the node number 101 are displayed.

  As shown in FIG. 9, the structure node data generated by the structure node generation unit 301 is stored in the structure node storage area of the storage device such as the RAM 103 for each structure node group. In the structure node storage area, for example, coordinate data of nodes is stored for each node number.

  Among the plurality of structure nodes generated by the structure node generation unit 301, a line segment connecting adjacent structure nodes on the beam member of the beam model is defined as a structure beam element, and the structure beam A structure beam element number is assigned to each element. In FIG. 8, a plurality of structural beam elements numbered with structural beam element numbers such as [1] are displayed. [*] (* Is a number) is a code representing a structural beam element number.

  As shown in FIG. 10, the data of the structure beam element defined by the line segment between the adjacent structure nodes on the beam member is stored in the structure beam element storage area of the storage device such as the RAM 103. The In the structural beam element storage area, for example, node numbers at both ends of the structural beam element are stored for each structural beam element. In FIG. 10, the i end represents one end, and the j end represents the other end.

(About the element division unit 302)
In FIG. 7, the element division unit 302 divides the ground model and the beam model of the underground structure into elements in a lattice pattern based on the element division definition information that defines the element division method based on the plane distortion element of the ground model. It is means to do. For example, as shown in FIGS. 4 and 5, the element is divided by a plurality of grid lines parallel to the horizontal direction and a plurality of grid lines parallel to the depth direction. In addition, the element dividing unit 302 draws a grid line that overlaps the beam member b1 or the like in the extending direction at the position where each beam member b1 or the like of the beam model extends.

  FIG. 11 is an example of an input screen for element division definition information. As the element division definition information, the division pitch of the mesh in the depth direction and the horizontal direction of the ground, the rate of pitch increment in each direction, the length from the structure to the side boundary, and the like are input.

  When the “Create Mesh” button is pressed on the screen of FIG. 11, the element division unit 302 combines the ground model and the beam model of the underground structure with the element division method according to the element division definition information. As shown by the circles in FIG. 5, “mesh nodes in the structure” are generated as the first mesh node group in the beam model, and the ground model is “In-ground mesh nodes” are generated as a second mesh node group.

  For example, the element dividing unit 302 assigns a 4-digit node number after 1001 to the mesh nodes in the structure generated as the first mesh node group, and the ground generated as the second mesh node group A 5-digit node number starting with 10001 is assigned to the inner mesh node. In FIG. 5, a plurality of mesh nodes in the structure such as No. 1001 are displayed, and a plurality of mesh nodes in the ground such as No. 10046 are displayed.

  As shown in FIG. 9, the mesh node data generated by the element dividing unit 302 is stored for each mesh node group in a mesh node storage area of a storage device such as the RAM 103. In the mesh node storage area, for example, node coordinate data is stored for each node number.

  Further, the element dividing unit 302 divides the ground plane model into a lattice shape according to the set element division definition information, so that a plurality of quadrilateral plane distortion elements are obtained as shown in FIGS. Create a structured ground model. On the other hand, the “structure mesh nodes” generated by the element dividing unit 302 toward the beam model and the “structure” generated in the beam model by means different from the element dividing unit 302 (for example, the structure node generating unit 301). Regardless of the difference in the type of node between the object and the node, the line segment connecting adjacent nodes on the beam member of the beam model is defined as a mesh beam element, and the mesh beam element number for each mesh beam element Is numbered. For example, as shown in FIG. 5, the mesh beam element <29> is a beam element generated between the structure node 14 and the structure node 109, and the mesh beam element <30> is a structure node. 109 and the mesh node 1017 in the structure, and the mesh beam element <31> is a beam element generated between the mesh node 1017 in the structure and the mesh node 1018 in the structure. It is. <*> (* Is a number) is a code representing a mesh beam element number.

  As shown in FIG. 12, regardless of the type of node, mesh beam element data defined by line segments between adjacent nodes on the beam member is stored in the mesh beam element storage area of the storage device such as the RAM 103. Stored. In the mesh beam element storage area, for example, node numbers at both ends of the mesh beam element are stored for each mesh beam element. In FIG. 12, the i end represents one end, and the j end represents the other end.

(Regarding beam element regeneration unit 303)
In FIG. 7, the beam element regenerating unit 303 selects a mesh node in the structure from the “mesh beam element group in structure” that is a set of mesh beam elements generated in the beam model of the underground structure. “First beam element group”, which is a set of mesh beam elements generated between the structure nodes and “second beam”, which is a set of mesh beam elements generated between the mesh nodes in the structure "Element group" is deleted, and the beam element is regenerated between the structure nodes where the beam element disappears by deleting both beam element groups. The “in-structure mesh beam element group” is a beam generated by means different from the in-structure mesh node generated by the element dividing unit 302 toward the beam model and the element dividing unit 302 (for example, the structure node generating unit 301). It is a set composed of mesh beam elements generated based on the structure nodes generated in the model.

  FIG. 13 is a processing flow performed by the element dividing unit 302 and the beam element regenerating unit 303. The processing flow of FIG. 13 is performed in the automatic mesh creation process of step S18 of FIG. In the mesh definition process in step S16, the option “Automatically delete mesh (generates only necessary nodes in the structure)” is selected on the screen of FIG. 11, and the “Create mesh” button is pressed. Thus, the processing flow of FIG. 13 is started. The processing flow of FIG. 13 will be described below.

  The element dividing unit 302 uniformly divides the ground model and the beam model of the underground structure into elements in a lattice form based on the element division definition information that defines the element division method of the ground model (step S30). ). The beam element regeneration unit 303 is unnecessary for the beam model in the underground structure from among all the mesh nodes generated by the element division of the element division unit 302 (particularly, from the mesh nodes in the structure). In order to prevent generation of a simple mesh, a node corresponding to the extraction target node extraction condition is extracted (step S32).

  The beam element regeneration unit 303 is, for example, (1) a component point of a beam element of an underground structure, and (2) a mesh node having a node number generated by the element division unit 302 of 4 digits or more. (3) Nodes that satisfy all extraction conditions: (3) The ground model and the beam model of the underground structure do not exist on the shared beam member; (4) The ground model or the beam member positioned above it does not exist Is a node to be deleted. The beam element regeneration unit 303 can extract nodes (that is, mesh nodes in the structure) satisfying the extraction conditions (1) and (2) from the storage area of the storage device such as the RAM 103. Further, by searching for the nodes and double nodes on the outer shape from the outer shape information of the underground structure, the nodes satisfying the extraction conditions (3) and (4) can be extracted.

  A specific description will be given with reference to FIG. FIG. 14 shows the beam member b5 extracted from FIG. In FIG. 14A, the nodes corresponding to the nodes to be deleted on the beam member b5 are in-structure mesh nodes 1017, 1018, 1019, 1020. Other beam members may be considered in the same manner.

  Next, when at least one node at both ends of each mesh beam element matches the node to be deleted extracted in step S32, the beam element regeneration unit 303 stores the mesh beam element storage shown in FIG. The mesh beam element whose end is the node to be deleted is deleted from the region (steps S34 and S36). This determination / deletion process is performed for all mesh beam elements (step S38).

  For example, as shown in FIG. 14B, six mesh beam elements <30> to <35> are deleted from the beam member b5. The mesh beam element <29> is not deleted from the mesh beam element storage area shown in FIG. 12 because it does not correspond to the deletion target node because the nodes at both ends thereof are structure nodes.

  In this way, beam elements that are in contact with the ground and beam elements that are exposed on the ground surface are not included in the deletion target, so that the beam elements located at the boundary between such ground and the ground surface. It can be prevented that the accuracy of the structural analysis of the underground structure is lowered by the disappearance of.

  Next, the beam element regeneration unit 303 deletes all mesh beam elements that match the deletion condition in step S34, and then, from the mesh node storage area shown in FIG. 9, the in-structure mesh corresponding to the node to be deleted. The node is deleted (step S40). If there are multiple mesh beam elements that share a mesh node in a structure, deleting the mesh node in the structure first prevents such mesh beam elements from becoming undeleteable. is there.

  For example, as shown in FIG. 14C, in the beam member b5, the four mesh nodes 1017, 1018, 1019, and 1020 in the structure are deleted.

  Next, the beam element regeneration unit 303 does not store the structure beam element stored in the structure beam element storage area shown in FIG. 10 in the mesh beam element storage area shown in FIG. Then, the structural beam elements that are not stored in the mesh beam element storage area are added and stored in the mesh beam element storage area (step S44). This determination / additional storage process is executed for all structural beam elements (step S46).

  For example, as shown in FIG. 14C, in the beam member b5, the two structural beam elements [14] and [15] do not have overlapping mesh beam elements due to the deletion of the mesh beam elements. In this case, a beam element is newly generated between the structure nodes 109 and 110 in which the beam element disappears due to the deletion of the mesh beam element, and the generated beam element has a new mesh beam element number <201>. The mesh beam elements are stored as mesh beam elements in the mesh beam element storage area shown in FIG. The same applies to the beam element newly generated between the structure nodes 110 and 15.

  By performing the processing flow of FIG. 13 as described above, it is possible to prevent an unnecessary mesh from being generated in the beam model in the underground structure by the fine beam elements. That is, the mesh beam elements generated in the beam model of the underground structure by the grid-like element division are deleted except for those overlapping the structure beam element defined in advance by the user. The structure beam elements generated at an arbitrary position by the user in step S14 in FIG. 1 are aggregated and stored as mesh elements in the mesh beam element storage area shown in FIG. It becomes easy to calculate in combination with the plane distortion element generated in a shape. As a result, the calculation efficiency of the structural analysis by the analysis unit 304 in FIG. 7 increases, and the calculation speed can be increased.

(About the analysis unit 304)
In FIG. 7, the analysis unit 304 executes the analysis process of step S20 of FIG. 1 after the processing flow of FIG. The analysis unit 304 deletes the mesh beam element from the “mesh beam element group in the structure” that is a set of mesh beam elements generated toward the beam model of the underground structure as described above. The beam elements remaining between the structure nodes (in the case of FIG. 14, the mesh beam element <29>) and the beam elements regenerated by the beam element regeneration unit 303 (in the case of FIG. 14). , Mesh beam elements <201> and <202>), and a means for analyzing the strength of the underground structure. The analysis unit 304 analyzes and evaluates the strength of the underground structure based on, for example, a seismic design method such as the FEM response seismic intensity method or the FEM response displacement method.

  The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above-described embodiments, and various modifications and substitutions can be made to the above-described embodiments without departing from the scope of the present invention. Can be added.

  For example, in FIG. 6, the structural analysis apparatus 10 may be realized by a single computer, or the entire system including a client terminal and a server that provides a function according to the present invention upon receiving a request from the client terminal. It may be realized by.

  Further, for example, in the mesh definition process in step S16 in FIG. 1, when the option “Delete mesh with mouse” is selected on the screen in FIG. 11 and the “Create mesh” button is pressed, FIG. Such a mesh display screen is displayed on the display device 107. In FIG. 15, mesh elements are generated in both the ground model and the beam model of the underground structure by dividing both the ground model and the beam model of the underground structure in a grid pattern. By selecting each mesh element with this mouse on this screen, the selected mesh elements can be deleted one by one. Further, when the “delete unnecessary node in structure” command at the top of the screen is selected, the processing after step 32 in the processing flow of FIG. 13 is executed. Thus, on the screen of FIG. 11, the option “Delete mesh with mouse” is selected without selecting the option “Automatically delete mesh (generates only necessary nodes in the structure)”, Even if the “Create Mesh” button is pressed, an unnecessary fine mesh in the structure can be deleted by the “Delete unnecessary node in structure” command on the screen of FIG.

10 Structural analysis apparatus 101 CPU
102 ROM
103 RAM
DESCRIPTION OF SYMBOLS 104 Auxiliary storage device 105 Recording medium reader 106 Input device 107 Display apparatus 108 Communication apparatus 109 Recording medium 301 Structure node generation part 302 Element division part 303 Beam element regeneration part 304 Analysis part b * Beam member [*] Structure beam Element ＜ ＊ ＞ Mesh beam element

Claims (11)

An element dividing unit for dividing the ground model and the numerical beam model of the structure embedded in the ground together into elements based on information defining a ground model element dividing method for the ground numerical calculation; ,
From among mesh beam element groups generated based on the mesh nodes generated toward the beam model by the element dividing means and the structure nodes generated in the beam model by means different from the element dividing means. The first beam element group generated between the mesh node and the structure node and the second beam element group generated between the mesh nodes are deleted, and both beam element groups are deleted. A mesh creation device comprising beam element regeneration means for regenerating beam elements between the structure nodes where beam elements have disappeared.   The mesh creation device according to claim 1, wherein the beam element at the site in contact with the ground and the beam element at the site on the ground surface are not included in the deletion target from the mesh beam element group. The mesh creation device according to claim 1 or 2,
The beam elements remaining between the structure nodes by deleting both beam element groups from the mesh beam element group, and the beam elements regenerated by the beam element regenerating means, A structural analysis apparatus comprising: an analysis means for analyzing the strength of a structure. An element dividing step of dividing the ground model and the numerical beam model of the structure embedded in the ground together into elements based on information defining a ground model element dividing method in the ground numerical calculation; ,
From among mesh beam element groups generated based on the mesh nodes generated toward the beam model by the element dividing means and the structure nodes generated in the beam model by means different from the element dividing means. The first beam element group generated between the mesh node and the structure node and the second beam element group generated between the mesh nodes are deleted, and both beam element groups are deleted. A mesh generation method comprising: a beam element regeneration step for regenerating a beam element between the structure nodes where the beam element has disappeared.   The mesh creation method according to claim 4, wherein a beam element at a site in contact with the ground and a beam element at a site on the ground surface are not included in the deletion target from the mesh beam element group. Including the mesh creation method according to claim 4 or 5,
The beam elements remaining between the structure nodes by deleting both beam element groups from the mesh beam element group, and the beam elements regenerated by the beam element regenerating means, A structural analysis method comprising an analysis step of analyzing the strength of a structure. Computer
An element dividing unit for dividing the ground model and the numerical beam model of the structure embedded in the ground together into elements based on information defining a ground model element dividing method for the ground numerical calculation; ,
From among mesh beam element groups generated based on the mesh nodes generated toward the beam model by the element dividing means and the structure nodes generated in the beam model by means different from the element dividing means. The first beam element group generated between the mesh node and the structure node and the second beam element group generated between the mesh nodes are deleted, and both beam element groups are deleted. A mesh creation program for functioning as beam element regeneration means for regenerating beam elements between the structure nodes where beam elements have disappeared.   The mesh creation program according to claim 7, wherein the beam element at the site in contact with the ground and the beam element at the site on the ground surface are not included in the deletion target from the mesh beam element group. Including the mesh creation program according to claim 7 or 8,
Computer
The beam elements remaining between the structure nodes by deleting both beam element groups from the mesh beam element group, and the beam elements regenerated by the beam element regenerating means, A structure analysis program that functions as an analysis tool for analyzing the strength of structures.   A computer-readable recording medium in which the mesh creation program according to claim 7 or 8 is recorded.   A computer-readable recording medium on which the structural analysis program according to claim 9 is recorded.

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