3D automated modeling method for bridges based on 3DE parametric templates

Abstract

The present invention relates to the field of bridge modeling. To improve modeling efficiency, a method for automated three-dimensional bridge modeling based on 3DE parametric templates is provided, comprising: step 1: establishing a line model; step 2: selecting a bridge position determination mode and inputting bridge layout parameters; step 3: determining the bridge position, actual span length, and bridge type based on the bridge layout parameters; and step 4: calling a pre-stored parametric bridge type template based on the line model, bridge position, actual span length, and bridge type to complete bridge modeling. The above steps improve modeling efficiency.

Description

Technical Field

[0001] The present invention relates to the field of bridge modeling, and in particular to a three-dimensional automatic bridge modeling method based on a 3DE parameterized template. Background Art

[0002] With the advancement of digital technology in the infrastructure industry, three-dimensional models can not only intuitively display the appearance of the project during the design and construction process of bridge projects, but also improve design and construction efficiency when combined with digital parameters.

[0003] Currently, 3D bridge models can be created within 3DE, combining a comprehensive modeling foundation. This approach primarily utilizes a skeleton + template approach. The skeleton represents the control point locations for each span in the bridge model, while the templates are parametric component models for beams, slabs, abutments, and piers, adapting to input parameters based on the model's requirements. The overall process involves first establishing the route, then manually setting the positions of the various bridge skeletons, and finally applying different templates to the corresponding locations to create the final bridge model.

[0004] It can be seen that the three-dimensional model of the bridge on the 3DE platform has the following shortcomings:

[0005] 1) Since the bridge structure is generated based on the route type, when there are multiple bridges on a route, the bridge locations need to be selected after the route design is completed. When separate 3D models need to be built in different ranges, the modeling efficiency is low.

[0006] 2) For most bridge structures, a universal structural form can be adopted. Although the relevant bridge template library can be customized on the 3DE platform, when establishing a three-dimensional bridge model, the same template needs to be called separately for modeling the same type of bridges at different locations. Batch calling cannot be achieved, which reduces the versatility of the template.

[0007] 3) Due to the limitations of professional design processes, it is impossible to quickly complete the bridge layout after the line is completed.

[0008] 4) Under the influence of factors such as line direction, bridge form, and bridge position changes, the original bridge model cannot be updated in a coordinated manner, and the model's inheritance is poor.

[0009] 5) All bridges in the line cannot be automatically counted and output into a layout table. Summary of the Invention

[0010] In order to improve modeling efficiency, this application provides a three-dimensional automated modeling method for bridges based on 3DE parametric templates.

[0011] The technical solution adopted by the present invention to solve the above problems is:

[0012] The 3D automated bridge modeling method based on 3DE parametric templates includes:

[0013] Step 1: Establish a circuit model;

[0014] Step 2: Select the bridge position determination mode and enter the bridge layout parameters;

[0015] Step 3: Determine the bridge location, actual span length, and bridge type based on the bridge layout parameters;

[0016] Step 4: Based on the line model, bridge location, actual span length and bridge type, call the pre-stored bridge type parametric template to complete the bridge modeling.

[0017] Furthermore, the line model includes: a road centerline, terrain, and left and right side lines of the road.

[0018] Furthermore, the bridge position determination mode includes an automatic determination mode and a manual input mode;

[0019] When the bridge position determination mode is the automatic determination mode, the bridge layout parameters include: fill threshold H1, minimum section length L1, span length D and bridge type;

[0020] When the bridge position determination mode is the manual input mode, the bridge layout parameters include: starting point KA, end point KB, actual span length and bridge type.

[0021] Furthermore, when the bridge position determination mode is the automatic determination mode, the specific steps for determining the bridge position and actual span length according to the bridge layout parameters are as follows:

[0022] Step 31, calculating the height difference H between the line and the terrain;

[0023] Step 32: The length of the section that continuously satisfies the condition that the height difference H>fill threshold H1 is recorded as L;

[0024] Step 33: If L>minimum paragraph length L1, then obtain the starting point KA and the end point KB of L;

[0025] Step 34: Calculate the number of bridge piers Then the actual span length D1 = L / P.

[0026] Furthermore, when the bridge position determination mode is the automatic determination mode, the bridge layout parameters include: fill threshold H1, minimum segment length L1, maximum span length Dmax and minimum span length Dmin, and bridge type;

[0027] Correspondingly, the specific steps for determining the bridge location and actual span length based on the bridge layout parameters are as follows:

[0028] Step 31, calculating the height difference H between the line and the terrain;

[0029] Step 32: The length of the section that continuously satisfies the condition that the height difference H>fill threshold H1 is recorded as L;

[0030] Step 33: If L>minimum paragraph length L1, then obtain the starting point KA and the end point KB of L;

[0031] Step 34, calculate the maximum value Pmax and the minimum value Pmin of the bridge pier, Pmax = L / Dmax + 1, Pmin = L / Dmin + 1;

[0032] Step 35: Number of Piers The actual span length D1 = L / (P-1).

[0033] Furthermore, the bridge types include: superstructure type, pier type and abutment type.

[0034] Furthermore, the step 4 of completing the bridge modeling also includes model preview and modification.

[0035] Furthermore, the method further includes step 5 of extracting and saving relevant parameters of the bridge model.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] (1) Based on the bridge layout parameters, the bridge location, actual span length and bridge type can be directly obtained without manually setting the bridge sections, which improves modeling efficiency.

[0038] (2) When establishing a bridge model, multiple bridges can be generated in batches by combining various templates through interface operations. Preview and modification are also supported, saving operation time.

[0039] (3) The input condition for bridge modeling is line type. When the line type changes, the bridge model can change accordingly, and the model has strong inheritance.

[0040] (4) The system saves the basic information of bridge layout and can output the layout table of bridges along the entire line and the corresponding scale, thus avoiding manual statistics and reducing the error rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 This is a flowchart of the bridge 3D automated modeling method based on 3DE parametric templates;

[0042] Figure 2 This is a flow chart for determining the bridge position and actual span length in automatic judgment mode. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0044] like Figure 1 As shown in FIG, the 3D automated bridge modeling method based on the 3DE parametric template includes:

[0045] Step 1: Establish a line model, which includes at least: a road centerline, terrain, and left and right side lines of the road.

[0046] Step 2. Select the bridge position judgment mode and input the bridge layout parameters; this application provides two bridge position judgment methods: automatic judgment mode and manual input mode: when the bridge position judgment mode is automatic judgment mode, the bridge layout parameters include: fill threshold H1, minimum section length L1, span length D and bridge type; when the bridge position judgment mode is manual input mode, the bridge layout parameters include: starting point KA, end point KB, actual span length and bridge type.

[0047] Step 3: Determine the bridge location, actual span length, and bridge type based on the bridge layout parameters;

[0048] When the bridge position determination mode is manual input mode, the bridge position, actual span length and bridge type can be directly input; when the bridge position determination mode is automatic determination mode, the specific steps for determining the bridge position and actual span length according to the bridge layout parameters are as follows: Figure 2 As shown,

[0049] Step 31, automatically calculating the height difference H between each point on the line and the terrain;

[0050] Step 32: The length of the section that continuously satisfies the condition that the height difference H>fill threshold H1 is recorded as L;

[0051] Step 33: If L>minimum paragraph length L1, then obtain the starting point KA and the end point KB of L;

[0052] Step 34: Calculate the number of bridge piers Then the actual span length D1 = L / P.

[0053] Furthermore, in actual use, designers may not know the specific span length D, but only know the approximate range of the span length D. In this case, the automatic judgment mode will be very convenient. Corresponding bridge layout parameters include: fill threshold H1, minimum section length L1, maximum span length Dmax and minimum span length Dmin, and bridge type;

[0054] Correspondingly, the specific steps for determining the bridge position and span based on the layout parameters are as follows:

[0055] Step 31, calculating the height difference H between the line and the terrain;

[0056] Step 32: The length of the section that continuously satisfies the condition that the height difference H>fill threshold H1 is recorded as L;

[0057] Step 33: If L>minimum paragraph length L1, then obtain the starting point KA and the end point KB of L;

[0058] Step 34, calculate the maximum value Pmax and the minimum value Pmin of the bridge pier, Pmax = L / Dmax + 1, Pmin = L / Dmin + 1;

[0059] Step 35: Number of Piers The actual span length D1 = L / (P-1).

[0060] Setting the maximum span length Dmax and minimum span length Dmin can help designers quickly determine the layout of the bridge, and use this as a basis for adjusting the model, resulting in higher modeling efficiency.

[0061] Step 4: Complete bridge modeling by calling pre-existing parametric templates based on the route model, bridge location, actual span length, and bridge type. In this application, bridge types include superstructure types, pier types, and abutment types. Superstructure types support T-beams, small box girders, continuous slabs, and hollow slabs; pier types support cap-beam and vase-shaped piers; and abutment types support ribbed abutments, pile-column abutments, and U-shaped abutments. The templates for these models are all parametric, adaptable to different road alignments and widths, and the models can be combined arbitrarily.

[0062] For example, the input conditions of the parametric template for the small box girder structure are: road centerline, left and right shoulder lines, and bridge span positioning points; the output is: a three-dimensional model of the small box girder. Among them, (1) the road centerline controls the direction of the small box girder axis; (2) the left and right side lines control the total width of the bridge. The total width is divided by the standard small box girder width (such as 2.2m) and then rounded up to determine the number of standard small box girder plates required for each span; (3) the bridge span positioning points are determined by step 3 and are used to control the length of each span of the small box girder. Based on the starting point of the bridge and the actual span length, the starting and ending positions of each span (bridge position positioning points) can be calculated. For example, the starting point of the first span = the starting pile number of the bridge + the starting abutment length + the expansion joint length, and the end point = the starting point of the first span + the first span length. The starting point of the second span = the end point of the first span + the expansion joint length, and the end point of the second span = the starting point of the second span + the second span length, and so on. The abutment length can be set according to actual needs.

[0063] The parametric template for the capped-beam-column pier structure requires inputs such as the road centerline, left and right shoulder lines, pier location points, and heading. The output is a 3D model of the capped-beam-column pier. Pier location points are determined based on the span location points. For example, the first pier location point = the end point of the first span + the expansion joint length / 2, and so on.

[0064] The parametric template for the ribbed abutment (with tapered slope) model takes as input the road centerline, left and right shoulder lines, and the bridge head and tail anchor points. The output is a 3D model of the ribbed abutment (with tapered slope). The abutment anchor points correspond to the bridge's starting and ending points.

[0065] The parametric template for the bridge guardrail model takes as input the road centerline, left and right shoulder lines, and guardrail positioning points. The output is a 3D model of the roadside bridge guardrail. The guardrail's starting and ending points are equal to the bridge's starting and ending points, and the guardrail's position is offset outside the left and right shoulder lines (the default value is 0.25m, which can be modified).

[0066] The information of each positioning point can be obtained in batches through the bridge position and actual span length, thereby completing batch modeling and improving modeling efficiency.

[0067] Furthermore, completing the bridge modeling in step 4 also includes model preview and modification. After completing the bridge modeling in step 4, you can use the model preview to check whether the generated model meets the requirements. If any modifications are required, you can directly modify the relevant parameters. Since the input condition for bridge modeling in this application is linear, when the linear type changes, the bridge model can also change in conjunction with it, which enhances inheritance.

[0068] Preferably, the system further includes step 5, extracting relevant parameters of the bridge model to obtain and save a table of bridge layout information for the entire line, including information such as the starting and ending points of the bridges, the bridge structure, and the span composition. The system automatically saves the bridge layout information, eliminating manual statistics and reducing the error rate.

Claims

1. A three-dimensional automated bridge modeling method based on a 3DE parametric template, characterized in that: include: Step 1: Establish a circuit model; Step 2: Select the bridge position determination mode and enter the bridge layout parameters; Step 3: Determine the bridge location, actual span length, and bridge type based on the bridge layout parameters; Step 4: Based on the line model, bridge location, actual span length and bridge type, the pre-stored bridge type parametric template is called to complete the bridge modeling; Specifically, the bridge position determination mode includes an automatic determination mode and a manual input mode; When the bridge position determination mode is the automatic determination mode, the bridge layout parameters include: fill threshold H1, minimum section length L1, span length D, and bridge type; the specific steps for determining the bridge position and actual span length based on the bridge layout parameters are as follows: Step 31, calculating the height difference H between the line and the terrain; Step 32: The length of the section that continuously satisfies the condition that the height difference H>fill threshold H1 is recorded as L; Step 33: If L>minimum paragraph length L1, then obtain the starting point KA and the end point KB of L; Step 34: Calculate the number of bridge piers , then the actual span length D1=L / P; When the bridge position determination mode is the manual input mode, the bridge layout parameters include: starting point KA, end point KB, actual span length and bridge type.

2. The method for three-dimensional automated modeling of bridges based on 3DE parametric templates according to claim 1 is characterized in that: The line model includes: a road centerline, terrain, and left and right side lines of the road.

3. The method for three-dimensional automated modeling of bridges based on 3DE parametric templates according to claim 1 is characterized in that: When the bridge position determination mode is the automatic determination mode, the bridge layout parameters include: fill threshold H1, minimum segment length L1, maximum span length Dmax and minimum span length Dmin, and bridge type; Correspondingly, the specific steps for determining the bridge location and actual span length based on the bridge layout parameters are as follows: Step 31, calculating the height difference H between the line and the terrain; Step 32: The length of the section that continuously satisfies the condition that the height difference H>fill threshold H1 is recorded as L; Step 33: If L>minimum paragraph length L1, then obtain the starting point KA and the end point KB of L; Step 34, calculate the maximum value Pmax and the minimum value Pmin of the bridge pier, Pmax=L / Dmax+1, Pmin=L / Dmin+1; Step 35: Number of Piers , the actual span length D1=L / (P-1).

4. The method for three-dimensional automated modeling of bridges based on 3DE parametric templates according to claim 1 is characterized in that: The bridge types include: superstructure type, pier type and abutment type.

5. The method for automatic three-dimensional bridge modeling based on 3DE parametric template according to claim 1 is characterized in that: The step 4 of completing the bridge modeling also includes model preview and modification.

6. The method for automated three-dimensional bridge modeling based on a 3DE parametric template according to any one of claims 1 to 5, characterized in that: The method also includes step 5 of extracting and saving relevant parameters of the bridge model.

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