An adaptive modeling method for cast-in-place boxes of bridges based on three-dimensional edge lines

Abstract

The present invention provides a method for adaptively modeling a cast-in-place box of a bridge based on three-dimensional edge lines, comprising the following steps: S1. Define a parameter template for cast-in-place box components, and set fixed parameters and variable parameters for cast-in-place box components; S2. Extract the three-dimensional edge lines of the bridge, and automatically calculate the number of box chambers in combination with the fixed parameters of the components; S3. Calculate the coordinates of the cantilever line and the web line according to the three-dimensional edge lines of the bridge, the fixed parameters of the components, and the number of box chambers; S4. Generate a set of key cross-sections according to the component parameters, calculate the variable parameters of each key cross-section, and generate outer box and inner box cross-section lines; S5. Topologically stretch the outer box and inner box cross-section lines of the key cross-sections along the three-dimensional edge lines, the cantilever line, and the web line to establish a cast-in-place box model. The present invention ensures the accuracy of the model, has the advantages of short time consumption and high modeling efficiency, and greatly improves the model quality and modeling efficiency.

Description

Technical Field

[0001] The present invention belongs to the technical field of bridge engineering, and in particular relates to a method for self-adaptive modeling of cast-in-place boxes of bridges based on three-dimensional side lines. Background Art

[0002] Bridges play an important role in municipal transportation. As an upper structure form of bridges, cast-in-place boxes are extremely widely used in bridges. Cast-in-place boxes are generally located in the curve sections of bridges and the complex sections of the dividing ramps at the junctions of branch roads and main roads, and need to be cast-in-place. The prefabricated components in factories can no longer adapt to the actual situation. Therefore, it is necessary to establish a three-dimensional model of the cast-in-place box to assist designers in making scientific decisions to guide the planning, design, and construction of bridges.

[0003] The cast-in-place box is longitudinally cast along the line. The left and right side lines, cantilever lines, and web lines of the line form longitudinal positioning lines, and the inner box is dispersedly located between the cantilever lines and the web lines.

[0004] The existing three-dimensional design software has the following problems in the modeling process:

[0005] 1) The general modeling software lacks specialization. The modeling software provides general modeling tools and lacks professional bridge modules. Designers need to manually build the cast-in-place box model in a way of building blocks, which is inefficient and time-consuming. When the line side line changes or the parameters of the cast-in-place box change, the existing model needs to be recreated, increasing a huge workload.

[0006] 2) The applicable range of professional bridge software is narrow. Although the existing professional software can build models through parameters, the models are mainly built by stretching along the road center line through parameter templates, and are not deeply combined with the actual side lines. Most of the models are of equal width or linearly variable width, and less consider the case of non-linearly variable width. In addition, the general applicability of bridge parameter templates is low. Bridges of different widths need to input dedicated parameter templates, and the reusability of the templates is not strong. Summary of the Invention

[0007] The purpose of the present invention is to provide a method for self-adaptive modeling of cast-in-place boxes of bridges based on three-dimensional side lines, so that when design information such as side lines changes, the cast-in-place box model can be rebuilt conveniently and quickly without adjusting the template, improving the design quality and efficiency.

[0008] To achieve the above object, the present invention is realized by the following technical solutions:

[0009] A method for self-adaptive modeling of cast-in-place boxes of bridges based on three-dimensional side lines includes the following steps:

[0010] S1. Define the parameter template of the cast-in-place box component, and set the fixed parameters and variable parameters of the cast-in-place box component;

[0011] S2. Extract the three-dimensional edge lines of the bridge, and automatically calculate the number of box chambers in combination with the fixed parameters of the components.

[0012] S3. Calculate the coordinates of the cantilever line and the web line based on the three-dimensional edge lines of the bridge, the fixed parameters of the components, and the number of box chambers.

[0013] S4. Generate a set of key cross-sections according to the component parameters, calculate the variable parameters of each key cross-section, and generate the cross-section lines of the outer box and the inner box.

[0014] S5. Topologically stretch the cross-section lines of the outer box and the inner box of the key cross-sections along the three-dimensional edge lines, the cantilever line, and the web line to establish a cast-in-place box model.

[0015] While adopting the above technical solutions, the present invention can also adopt or combine the following technical solutions:

[0016] As a preferred technical solution of the present invention: in step S1, the fixed parameters of the cast-in-place box components include: the type parameters of the cast-in-place box, the plane size parameters of the cast-in-place box, the longitudinal section size parameters of the cast-in-place box, and the cross-section size parameters of the cast-in-place box:

[0017] The variable parameters of the cast-in-place box components include: the top width of the key cross-section, the bottom width of the key cross-section, and the box chamber width of the key cross-section.

[0018] As a preferred technical solution of the present invention: the type parameters of the cast-in-place box include: the cross slope form of the beam top, the cross slope form of the beam bottom, the transverse layout form, the form of the side web, the width of the side box chamber, the web layout mode, the maximum box chamber width, and the minimum box chamber width.

[0019] As a preferred technical solution of the present invention: the plane size parameters of the cast-in-place box include: the length of the web widening section, the length of the web transition section, and the web chamfer.

[0020] As a preferred technical solution of the present invention: the longitudinal section size parameters of the cast-in-place box include: the top and bottom chamfer mode, the top plate chamfer, the length of the top plate widening section, the length of the top plate transition section, the bottom plate chamfer, the length of the bottom plate widening section, and the length of the bottom plate transition section.

[0021] As a preferred technical solution of the present invention: the cross-section size parameters of the cast-in-place box include: the beam height, the top plate thickness, the bottom plate thickness, the cantilever chamfer, the bottom plate chamfer, the input mode of the side web width, the side web thickness, the top and bottom chamfers of the side web, the middle web thickness, the top and bottom chamfers of the middle web, the cantilever width, the end height, the root height, and the web slope.

[0022] As a preferred technical solution of the present invention: in step S2, according to the starting mileage and the ending mileage of the current in-situ box, the three-dimensional side lines within this range are extracted. Using the minimum box chamber width minW and the maximum box chamber width maxW in the in-situ box component type parameters in the in-situ box component parameter template as the constraint boundary conditions, the set of box chamber numbers Ω at the starting mileage is calculated respectively. s and the set of box chamber numbers Ω at the ending mileage e . The intersection of the two is used as the candidate set of box chamber numbers Ω box =Ω s ∩Ω e ;

[0023] Select as the evaluation value, where n represents the selected number of box chambers and w represents the bottom width of the box chamber at this mileage. The evaluation values corresponding to each box chamber in the candidate set of box chamber numbers Ω box are calculated respectively, and the number of box chambers with the largest evaluation value is selected as the final number of box chambers to be used.

[0024] As a preferred technical solution of the present invention: in step S3, first, the end coordinates of the cantilever line and the web line at the starting mileage and the ending mileage are determined. Then, in combination with the longitudinal trend of the three-dimensional side line and the reference relationship between the lines, the complete line coordinates of the cantilever line and the web line in the longitudinal direction are calculated successively.

[0025] As a preferred technical solution of the present invention: in step S4, the set of key cross-sections is determined by the chamfer mutation positions, thickness mutation positions, and width mutations of the in-situ box plane dimension parameters and the in-situ box longitudinal section dimension parameters in the in-situ box component parameter template;

[0026] The variable parameters of each key cross-section are to calculate the intersection points of each key cross-section with the three-dimensional side line, the cantilever line, and the web line, and successively determine the top width of the key cross-section, the bottom width of the key cross-section, and the box chamber width of the key cross-section;

[0027] The cross-section lines of the outer box and the inner box are determined by the in-situ box type parameters, the in-situ box cross-section dimension parameters, the top width of the key cross-section, the bottom width of the key cross-section, and the box chamber width of the key cross-section in the in-situ box component parameter template.

[0028] As a preferred technical solution of the present invention: in step S5, through the outer box and inner box cross-section lines of each key cross-section in the set of key cross-sections of the in-situ box in step S4, they are stretched along the three-dimensional side line, the cantilever line, and the web line, and topologically combined into an in-situ box model.

[0029] The present invention provides an adaptive modeling method for cast-in-situ boxes of bridges based on three-dimensional edge lines. Based on the actual three-dimensional edge lines, integrating various data such as the type and size parameters of the cast-in-situ box, it adaptively calculates the number of box chambers, dynamically determines the positions of the cantilever line and the web line, and quickly establishes a cast-in-situ box model. For sections with complex edge lines such as curves and variable widths, this modeling method has good adaptability. The standardized modeling process ensures the accuracy of the model, has the advantages of short time consumption and high modeling efficiency, and greatly improves the model quality and modeling efficiency. The present invention provides a cast-in-situ box model modeling method with a wider application range and higher efficiency. Using this method, little manual intervention is required. Only by inputting the corresponding component parameters, a three-dimensional model of the cast-in-situ box can be established in real time and dynamically. The present invention is applicable to the three-dimensional modeling design of cast-in-situ box bridges in the transportation field. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 FIG. is a flowchart of the adaptive modeling method for cast-in-situ boxes of bridges based on three-dimensional edge lines provided by the present invention.

[0031] Figure 2 FIG. is a schematic diagram of the plane parameters of the cast-in-situ box.

[0032] Figure 3 FIG. is a schematic diagram of the longitudinal section parameters of the cast-in-situ box.

[0033] Figure 4 FIG. is a schematic diagram of the cross-section parameters of the cast-in-situ box.

[0034] Figure 5 FIG. is a schematic diagram of the cast-in-situ box model obtained by the present invention.

[0035] Figure 6a FIG. is a diagram of a 5-box combination.

[0036] Figure 6b FIG. is a diagram of a 4-box combination.

[0037] Figure 7 FIG. is a diagram showing the process of establishing the cast-in-situ box model provided by the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0038] An adaptive modeling method for cast-in-situ boxes of bridges based on three-dimensional edge lines includes the following steps:

[0039] S1. Define a template for the component parameters of the cast-in-situ box, and set the fixed parameters and variable parameters of the cast-in-situ box components;

[0040] The fixed parameters of the cast-in-situ box components include: the type parameters of the cast-in-situ box, the plane size parameters of the cast-in-situ box, the longitudinal section size parameters of the cast-in-situ box, and the cross-section size parameters of the cast-in-situ box.

[0041] The parameters of the cast-in-place box include: the form of the cross slope at the top of the beam, the form of the cross slope at the bottom of the beam, the transverse layout form, the form of the side web, the web layout mode, the maximum box chamber width, and the minimum box chamber width;

[0042] The plane dimension parameters of the cast-in-place box include: the length of the web widening section, the length of the web transition section, and the web plane chamfer.

[0043] The longitudinal section dimension parameters of the cast-in-place box include the top and bottom chamfer modes, the top plate chamfer, the length of the top plate widening section, the length of the top plate transition section, the bottom plate chamfer, the length of the bottom plate widening section, and the length of the bottom plate transition section;

[0044] The cross-section dimension parameters of the cast-in-place box include: the beam height, the top plate thickness, the bottom plate thickness, the cantilever chamfer, the bottom plate chamfer, the input method of the side web width, the side web thickness, the top and bottom chamfers of the side web, the middle web thickness, the top and bottom chamfers of the middle web, the cantilever width, the end height, the root height, and the web slope.

[0045] The variable parameters of the cast-in-place box components include: the top width of the key cross-section, the bottom width of the key cross-section, and the box chamber width of the key cross-section.

[0046] S2. Extract the three-dimensional edges of the bridge, and combine with the fixed parameters of the components to automatically calculate the number of box chambers

[0047] According to the starting mileage and ending mileage where the current cast-in-place box is located, extract the three-dimensional edges within this range, and combine with the cast-in-place box component parameter template defined in step S1 to calculate the set of the number of box chambers Ω that meet the maximum and minimum box chamber width constraint conditions at the starting and ending mileages respectively s and Ω e , and take their intersection as the candidate set of the number of box chambers Ω box .

[0048] The specific calculation is as follows:

[0049] Let the original number of box chambers be n0, the original bottom width be w0, the new number of box chambers be n, the new bottom width be w, the middle web thickness be w1, the side web thickness be w2, the width of the side box chamber be outW, the box chamber width be boxW, the maximum box chamber width be maxW, and the minimum box chamber width be minW. Solve for the new number of box chambers n according to the following formula

[0050] Calculate the intermediate variables:

[0051]

[0052]

[0053] Consider the following 4 modes

[0054] Mode 1: Straight web, when the side web is fixed,

[0055]

[0056] Mode 2: When the straight web is used and the side webs are not fixed,

[0057]

[0058] Mode 3: When the web is not straight and the side webs are fixed,

[0059]

[0060] Mode 4: When the web is not straight and the side webs are not fixed,

[0061]

[0062] Calculate the set of chamber ranges Ω when calculating the maximum and minimum chamber widths under the first cross-section respectively s It is [n1, n2].

[0063] Calculate the chamber ranges Ω when calculating the maximum and minimum chamber widths under the tail cross-section respectively e It is [n3, n4].

[0064] The set of candidate chamber numbers Ω that meet the conditions box is:

[0065] [n min , n max = [n1, n2] ∩ [n3, n4]

[0066] Select as the evaluation value, calculate the evaluation values of the candidate chamber numbers respectively, and select the chamber number corresponding to the largest value of value as the optimal chamber number.

[0067] S3. Calculate the coordinates of the cantilever line and the web line according to the three-dimensional bridge side line, the component fixing parameters and the chamber number

[0068] According to the three-dimensional bridge side line, the cast-in-place box component parameters and the chamber number determined in step S2, determine the end coordinates of the longitudinal cantilever line and the longitudinal web line at the starting mileage and the ending mileage.

[0069] According to the end coordinates, the longitudinal trend of the three-dimensional side line and the reference relationship between adjacent lines, calculate the complete line coordinates of the cantilever line and the web line longitudinally in sequence.

[0070] S4. Generate a set of key cross-sections according to the component parameters, calculate the variable parameters of each key cross-section, and generate the cross-section lines of the outer box and the inner box

[0071] The set of key cross-sections is determined by the chamfer mutation positions, thickness mutation positions, and width mutations of the cast-in-place box's planar dimension parameters and longitudinal section dimension parameters. Calculate the intersection points of each key cross-section with the three-dimensional edge line, cantilever line, and web line respectively, and sequentially determine the top width, bottom width, and box chamber width of the key cross-section. On this basis, combined with the form parameters of the cast-in-place box and the cross-section dimension parameters of the cast-in-place box, the outer box and inner box cross-section lines of the key cross-section are deduced.

[0072] S5. Topologically stretch the outer box and inner box cross-section lines of the key cross-section along the three-dimensional edge line, cantilever line, and web line to establish a cast-in-place box model

[0073] According to the key cross-sections of the cast-in-place box in step S4, sequentially stretch the corresponding section points of the outer box and inner box cross-section lines of each key cross-section along the three-dimensional edge line, cantilever line, and web line before and after, and topologically combine them into a cast-in-place box model.

[0074] In step S1, the cast-in-place box's planar dimension parameters, longitudinal section dimension parameters, and cross-section dimension parameters of the cast-in-place box formwork are respectively as Figure 2 、 Figure 3 、 Figure 4 shown. The positions of the key cross-sections are marked at Figure 2 、 Figure 3 .

[0075] In step S3, the cantilever line is the longitudinal connection line of the cantilever points, which are respectively located on the left and right sides of the cast-in-place box. As Figure 5 shown, the inside of the cast-in-place box is successively separated by the inner box, forming discrete hollow entities. The longitudinal connection line of the web center points between the boxes is the web line.

[0076] Specifically, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.

[0077] As Figure 5 shows, it presents the basic shape of the cast-in-place box model, marks professional terms such as the three-dimensional edge line, cantilever line, web line, outer box, and inner box. In this example, the three-dimensional center line and edge line of the road line already exist. Assuming the bridge span is 30m and the bridge is established at the starting mileage of 0 + 100 of the line, according to the parametric modeling method of the cast-in-place box model of the bridge based on the actual line described in the present invention, it mainly includes the following parts:

[0078] S1. Define the cast-in-place box component parameter template and set the component fixed parameters and component variable parameters;

[0079]

[0080]

[0081] S2. Extract the 3D edge lines of the bridge, and automatically calculate the number of box chambers in combination with the fixed parameters of the components;

[0082] For the starting position P1 and the ending position P2 of the current in-situ box, with the intersection angle between the in-situ box and the line being 90°, extract the 3D edge lines of the line within the bridge range: the left edge line edge1 and the right edge line edge2.

[0083] According to the constraints of the maximum box width and the minimum box width in the in-situ box parameters, it can be calculated that:

[0084] The set of box chambers at the starting position is:

[0085] Ω s ={3, 4, 5}

[0086] The set of box chambers at the ending position is:

[0087] Ω e ={4, 5, 6}

[0088] Select the intersection of the two:

[0089] Ω box ={4, 5}

[0090] As the alternative box combinations, namely: 4-box combination and 5-box combination, as Figure 6a-6b shown.

[0091] Calculate the evaluation values of the 5-box combination and the 4-box combination:

[0092] value5>value4

[0093] Select the 5-box combination as the box combination to be used.

[0094] S3. According to the 3D edge lines of the bridge, the fixed parameters of the components, and the number of box chambers, calculate the coordinates of the cantilever lines and the web lines

[0095] Shift the 3D edge lines on both the left and right sides inwards by the cantilever width to generate the left cantilever line bracket1 and the right cantilever line bracket2. Generate the web lines web1, web2, web3, and web4 within the middle range according to the dimension parameters.

[0096] S4. According to the component parameters, generate the set of key cross-sections, calculate the variable parameters of each key cross-section, and generate the cross-section lines of the outer box and the inner box

[0097] Divide the key cross-sections according to the chamfer mutation positions, thickness mutation positions, and width mutation positions of the plane dimension parameters and the longitudinal section dimension parameters, and finally generate the set of key cross-sections Ω sec ={sec1, sec2, sec3, …, sec n}, Each key cross-section intersects with the three-dimensional edge line, web line, and cantilever line in sequence to obtain the edge intersection point, cantilever line intersection point, and web line intersection point, and successively obtain the top width, bottom width, and box chamber width of the key cross-section at the key cross-section, and calculate the key cross-sections sec1, sec2, sec3, …, sec n of the outer box section line and the inner box section line.

[0098] S5. Topologically stretch the outer box and inner box cross-section lines of the key cross-section along the three-dimensional edge line, cantilever line, and web line to establish a cast-in-place box model

[0099] Sequentially along the specified path before and after, topologically stretch and connect the corresponding cross-section points of the outer box and inner box section lines of each key cross-section to form a cast-in-place box model.

[0100] In summary, through the above steps, a cast-in-place box model can be established (as Figure 7 shown). This method is based on the real three-dimensional edge line, without manual intervention during the modeling process, adaptively calculates the number of box chambers, automatically updates the cross-section parameters of the cast-in-place box, and well supports complex situations such as variable edge widths. When the edge changes or the parameters change, re-running the above steps can complete the model update and improve the modeling efficiency. Compared with manual modeling, the modeling efficiency can be increased by a hundred times, effectively meeting the engineering needs, enabling designers to concentrate on parameter optimization and select the best bridge scheme.

[0101] The above specific implementation manners are used to explain and illustrate the present invention, and are only the preferred embodiments of the present invention, rather than limiting the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and scope of the protection of the claims of the present invention fall within the protection scope of the present invention.

Claims

1. An adaptive modeling method for cast-in-place boxes of bridges based on three-dimensional edge lines, characterized in that: The adaptive modeling method for cast-in-situ box of bridge based on three-dimensional edge lines includes the following steps: S1. Define the parameter template of the cast-in-situ box component, and set the fixed parameters and variable parameters of the cast-in-situ box component; S2. Extract the three-dimensional edge lines of the bridge, and automatically calculate the number of box chambers in combination with the fixed parameters of the component; S3. Calculate the coordinates of the cantilever line and the web line according to the three-dimensional edge lines of the bridge, the fixed parameters of the component and the number of box chambers; S4. Generate a set of key cross-sections according to the component parameters, calculate the variable parameters of each key cross-section, and generate the cross-section lines of the outer box and the inner box; S5. Topologically stretch the cross-section lines of the outer box and the inner box of the key cross-section along the three-dimensional edge lines, the cantilever line and the web line to establish a cast-in-situ box model; In step S2, the number of box chambers is determined based on the starting mileage and the ending mileage of the current in-situ box. The three-dimensional side lines within this range are extracted, and the minimum box chamber width minW and the maximum box chamber width maxW in the in-situ box component type parameters of the in-situ box component parameter template are used as the constraint boundary conditions to calculate the set of box chamber numbers Ω at the starting mileage s and the set of box chamber numbers Ω at the ending mileage e . The intersection of the two is used as the candidate set of box chamber numbers Ω box = Ω s ∩ Ω e ; Select as the evaluation value, where n represents the number of selected chambers and w represents the bottom width of the chamber at this mileage. Calculate the evaluation values corresponding to each chamber in the candidate chamber number set Ω box respectively, and select the number of chambers with the largest evaluation value as the number of chambers finally used.

2. The adaptive modeling method for cast-in-place boxes of bridges based on three-dimensional edge lines according to claim 1, characterized in that: In step S1, the fixed parameters of the cast-in-situ box component include: the type parameter of the cast-in-situ box, the plane dimension parameter of the cast-in-situ box, the longitudinal section dimension parameter of the cast-in-situ box, and the cross-section dimension parameter of the cast-in-situ box: The variable parameters of the cast-in-situ box component include: the top width of the key cross-section, the bottom width of the key cross-section, and the box chamber width of the key cross-section.

3. The adaptive modeling method for cast-in-place boxes of bridges based on three-dimensional edge lines according to claim 2, characterized in that: The type parameter of the cast-in-situ box includes: the cross slope form of the beam top, the cross slope form of the beam bottom, the transverse layout form, the side web form, the side box chamber width, the web layout mode, the maximum box chamber width, and the minimum box chamber width.

4. The adaptive modeling method for cast-in-place boxes of bridges based on three-dimensional edge lines according to claim 2, characterized in that: The plane dimension parameter of the cast-in-situ box includes: the length of the web widening section, the length of the web transition section, and the web chamfer.

5. The adaptive modeling method for cast-in-place boxes of bridges based on three-dimensional edge lines according to claim 2, characterized in that: The longitudinal section dimension parameter of the cast-in-situ box includes: the top and bottom chamfer mode, the top plate chamfer, the length of the top plate widening section, the length of the top plate transition section, the bottom plate chamfer, the length of the bottom plate widening section, and the length of the bottom plate transition section.

6. The adaptive modeling method for cast-in-place boxes of bridges based on three-dimensional edge lines according to claim 2, characterized in that: The cross-section dimension parameter of the cast-in-situ box includes: the beam height, the top plate thickness, the bottom plate thickness, the cantilever chamfer, the bottom plate chamfer, the input mode of the side web width, the side web thickness, the top and bottom chamfers of the side web, the middle web thickness, the top and bottom chamfers of the middle web, the cantilever width, the end height, the root height, and the web slope.

7. The adaptive modeling method for cast-in-place boxes of bridges based on three-dimensional edge lines according to claim 1, characterized in that: In step S3, first, determine the end coordinates of the cantilever line and the web line at the starting mileage and the ending mileage, and then, in combination with the longitudinal direction of the three-dimensional edge line and the reference relationship between the lines, calculate the complete line coordinates of the cantilever line and the web line longitudinally in turn.

8. The adaptive modeling method for cast-in-place boxes of bridges based on three-dimensional edge lines according to claim 1, characterized in that: In step S4, the set of key cross-sections is determined by the chamfer mutation positions, thickness mutation positions, and width mutations of the plane dimension parameter and the longitudinal section dimension parameter of the cast-in-situ box component in the parameter template of the cast-in-situ box component; The variable parameters of each key cross-section are to calculate the intersection points of each key cross-section with the three-dimensional edge line, the cantilever line, and the web line, and determine the top width of the key cross-section, the bottom width of the key cross-section, and the box chamber width of the key cross-section in turn; The cross-section lines of the outer box and the inner box are determined by the type parameter of the cast-in-situ box, the cross-section dimension parameter of the cast-in-situ box, the top width of the key cross-section, the bottom width of the key cross-section, and the box chamber width of the key cross-section in the parameter template of the cast-in-situ box component.

9. The adaptive modeling method for cast-in-place boxes of bridges based on three-dimensional edge lines according to claim 1, characterized in that: In step S5, through the cross-section lines of the outer box and the inner box of each key cross-section in the set of key cross-sections of the cast-in-situ box in step S4, stretch along the three-dimensional edge line, the cantilever line, and the web line, and topologically combine them into a cast-in-situ box model.

Images