Artificial intelligence-based variable-width steel box girder design method and variable-width steel box girder main body

Abstract

The application discloses a variable-width steel box girder design method based on artificial intelligence and a variable-width steel box girder body, and relates to the technical field of bridge structure design. The variable-width steel box girder design method based on artificial intelligence imports design line and edge line data, establishes a geodetic coordinate system, sets a variable-width scheme and a box width distribution rule, arranges design calculation node lines along the longitudinal direction of the bridge at a fixed step, intelligently solves the bridge width, web coordinates and stiffening rib arrangement by using a geometric algorithm, and outputs high-precision plan drawings and three-dimensional models after AI iterative optimization. The application discloses a variable-width steel box girder design method based on artificial intelligence and a variable-width steel box girder body, and relates to the technical field of bridge structure design. The variable-width steel box girder design method based on artificial intelligence imports design line and edge line data, establishes a geodetic coordinate system, sets a variable-width scheme and a box width distribution rule, arranges design calculation node lines along the longitudinal direction of the bridge at a fixed step, intelligently solves the bridge width, web coordinates and stiffening rib arrangement by using a geometric algorithm, and outputs high-precision plan drawings and three-dimensional models after AI iterative optimization. The application abandons the traditional manual picking of the web center line, realizes dynamic distribution of the box chamber width, automatic positioning of the web and adaptive arrangement of the stiffening rib, shortens the design cycle from 7-15 days to 3 days, significantly improves the precision and efficiency, and the three-dimensional model can be directly connected to finite element calculation and numerical control machining, and is suitable for fine and digital design of various curve variable-width steel box girder bridges.

Description

Technical Field

[0001] This invention relates to the field of bridge structure design technology, specifically to a design method for variable-width steel box girders based on artificial intelligence and the main body of the variable-width steel box girder. Background Technology

[0002] Steel box girder bridges have advantages such as strong adaptability to curves, high precision in factory prefabrication, convenient installation, and good durability, and are widely used in various traffic engineering projects, including highways, municipal roads, and railways. Variable-width steel box girders need to adapt to changes in bridge deck width along their longitudinal direction, and their planar design directly determines the division of box girders, web positioning, stiffening rib arrangement, and diaphragm construction, making it a crucial aspect of the overall bridge design.

[0003] Current planar design of variable-width steel box girders suffers from the following main defects: Traditional manual drafting requires repeated iterations of box width, trial drawing of web centerlines and stiffening rib arrangements, resulting in a design cycle of up to 15 days, making it difficult to guarantee accuracy and consistency. Existing drafting programs only replace drafting operations; manual allocation of box width and selection of web centerlines are still required, and the quality of the design depends on the engineer's experience, failing to achieve intelligent optimization. Two-dimensional drawings are difficult to directly interface with finite element calculations and factory CNC machining; model conversion is prone to errors, affecting manufacturing and installation accuracy. The lack of a unified intelligent allocation logic for the small, medium, and large variable-width conditions leads to problems such as uneven box width and discontinuous or unreasonable stiffening ribs when multiple schemes are combined.

[0004] Current technologies cannot achieve dynamic allocation of box girder width, automatic web positioning, and intelligent matching of stiffening ribs at the algorithmic level, making it difficult to meet the high-precision, high-efficiency, and fully digital design requirements of modern bridges. Therefore, existing technologies need to be improved. Summary of the Invention

[0005] To address the problems of low efficiency, insufficient accuracy, high reliance on manual labor, and disconnected data links in existing variable-width steel box girder planar design, this invention provides an artificial intelligence-based design method and main body for variable-width steel box girders. This method enables intelligent dynamic allocation of the width of the entire bridge box girder, automatic generation of the web centerline, adaptive arrangement of longitudinal stiffeners, and high-precision 3D model output, significantly improving design efficiency and providing the benefits of enhanced refinement and digital delivery capabilities.

[0006] This invention is achieved through the following technical solution:

[0007] In a first aspect, this invention provides a design method for variable-width steel box girders based on artificial intelligence, which includes the following steps:

[0008] S1. Import basic data and establish a coordinate system. Obtain the design line plane data, the left and right edge lines of the bridge, the starting and ending station numbers, the width of the left and right cantilever arms, and the number of box cells. Establish a geodetic plane coordinate system. Pick up the three sets of polyline data of the design line, left edge line, and right edge line in CAD and form a plane coordinate sequence.

[0009] S2. Set the widening scheme and box width allocation rules, with three preset widening schemes: small, medium, and large. Support the selection of a single scheme or the use of multiple schemes in combination. Formulate the dynamic allocation principle of box width based on the change range of bridge deck width and stress requirements.

[0010] S3. Calculate the calculation section line and bridge width parameters. Layout several calculation section lines along the longitudinal direction of the bridge at fixed step lengths. Solve the intersection points of the calculation section lines with the left edge line and the right edge line based on the plane geometric analytical algorithm to obtain the left bridge width, right bridge width and total bridge width of each calculation section.

[0011] S4. Generate the coordinates of the cantilever and web, obtain the cantilever endpoints by offsetting the cantilever width, intelligently allocate the width of each box according to the widening scheme, and obtain the center coordinates of each web.

[0012] S5. The longitudinal stiffening ribs are designed to be adaptive, automatically matching the arrangement of long and short ribs according to changes in the width of the compartment.

[0013] S6. Full-bridge iterative optimization and drawing output: Traverse all calculated segments of the full bridge, iteratively optimize the alignment and box width allocation through AI algorithms, and output drawings and high-precision 3D models.

[0014] S7. Verification and review.

[0015] Furthermore, in this invention, the three widening schemes mentioned in step S2 above include scheme 1, which involves a small change in bridge width, selecting one or N compartments to widen while keeping the width of the remaining compartments unchanged, and arranging the longitudinal stiffening ribs along the entire length.

[0016] Furthermore, in this invention, the three widening schemes mentioned in step S2 above include scheme 2, in which the bridge width varies, one or N box cavities are widened while the width of the remaining box cavities remains unchanged, and the longitudinal stiffening ribs are arranged in a combination of full-length and short ribs.

[0017] Furthermore, in this invention, the three widening schemes mentioned in step S2 above include scheme 3, which involves widening all the box ducts when the bridge width varies greatly, and arranging the longitudinal stiffening ribs in a combination of full-length and short ribs.

[0018] Furthermore, in this invention, the fixed step length in step S3 is 1m or specified by the user, and the calculated segment line is the normal line at the corresponding station control point on the bridge design line.

[0019] Furthermore, in this invention, step S3 above employs a combined algorithm of straight line intersection and circular arc intersection to accurately determine the coordinates of the intersection point between the calculation nodal line and the edge line.

[0020] Furthermore, in this invention, in step S5 above, the start and end points, length and lateral spacing of the longitudinal stiffening ribs are automatically adjusted according to the gradual change of the box width to achieve a continuous and smooth arrangement.

[0021] Furthermore, in this invention, step S6 outputs a high-precision three-dimensional model, which is directly connected to the bridge finite element calculation and factory CNC machining system.

[0022] Furthermore, in this invention, if the review in step S7 fails, steps S1-S6 are repeated.

[0023] Secondly, the present invention also provides a variable-width steel box girder body, which adopts the aforementioned AI-based variable-width steel box girder design method, including a top plate, bottom plate, web plate, transverse diaphragms, longitudinal diaphragms, longitudinal stiffening ribs, and left and right cantilever arms; the width of the box girder is intelligently and dynamically allocated along the longitudinal direction, the center line of the web plate is automatically generated by an AI algorithm, and the longitudinal stiffening ribs are adaptively arranged with both full-length and short ribs.

[0024] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0025] 1. Compared with the traditional method of picking the web centerline, the AI-based variable-width steel box girder design method adopts a brand-new method of defining variable-width design scheme. Through repeated optimization and iteration by the AI ​​program, more ideal design results can be obtained, which fundamentally ensures the refinement of steel box girder design.

[0026] 2. The AI-based design method for variable-width steel box girders eliminates the need for designers to prepare extensive basic data, significantly improving design efficiency and quality.

[0027] 3. The longitudinal stiffening ribs can be intelligently matched according to the changes in the width of the chamber and the design scheme of the stiffening ribs, without the need for manual intervention, thus improving the design quality.

[0028] 4. The high-precision three-dimensional data model can be exported to the bridge finite element calculation model, which improves the calculation efficiency, ensures the accuracy of the calculation model, and can obtain more accurate calculation results.

[0029] 5. High-precision three-dimensional data models are applied during the manufacturing process of steel box girders, facilitating the use of high-precision welding and cutting technologies to ensure the structural stability and strong connections of the steel box girder bridge. Attached Figure Description

[0030] The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0031] Figure 1 A schematic diagram illustrating the data format for design lines and edge lines;

[0032] Figure 2 This is a schematic diagram of the widening scheme in Example 1;

[0033] Figure 3 This is a schematic diagram of the widening scheme in Example 1;

[0034] Figure 4 A schematic diagram of the core algorithm;

[0035] Figure 5 A schematic diagram of widening scheme 1

[0036] Figure 6 A schematic diagram of widening scheme 2

[0037] Figure 7 This is a schematic diagram of the widening scheme 3. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments and accompanying drawings. The illustrative embodiments and descriptions of this invention are for explanation only and are not intended to limit the invention. The following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without inventive effort are within the scope of protection of this invention.

[0039] It should be noted that similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0040] Example 1

[0041] This embodiment 1 provides a design method for variable-width steel box girders based on artificial intelligence, as detailed below:

[0042] First, obtain the design line plane data, the left and right edge lines of the bridge, the starting and ending station numbers, the width of the left and right cantilever, and the number of box cells; establish a geodetic plane coordinate system, and pick out three sets of polyline data in CAD: the design line, the left edge line, and the right edge line. Each polyline is composed of straight line segments and circular curve segments, and form a plane coordinate sequence according to a unified format.

[0043] Then, the widening scheme and box width allocation rules are set, with three preset widening schemes to choose from or combine multiple schemes: Scheme 1: small bridge width change, 1-N box cells widened, longitudinal stiffening ribs arranged along the entire length; Scheme 2: medium bridge width change, 1-N box cells widened, stiffening ribs arranged along the entire length + short ribs combination; Scheme 3: large bridge width change, all box cells widened, stiffening ribs arranged along the entire length + short ribs combination; a dynamic box width allocation scheme is formulated to ensure uniform stress on each box cell, reasonable structure, and convenient construction.

[0044] The intelligent calculation of segment lines and bridge width parameters involves laying out segment lines along the longitudinal direction of the bridge at 1m intervals or at user-specified intervals. The tangent angle ANG is determined using point P0 at design line station ZH1 and the adjacent micro-element point Pm2. A normal line is then drawn through P0 to form the calculated segment line. The system traverses the left and right edge lines, using straight line intersection and circular arc intersection algorithms to accurately solve for the intersection point P between the calculated segment line and the left and right edge lines. z P y We obtain the left bridge width B1 and the right bridge width B2.

[0045] P is determined by the width of the left and right cantilever arms. z P y Offset along the calculation section line to obtain the cantilever endpoints P1 and P6; according to the widening scheme and box width allocation rules, the remaining bridge width is intelligently allocated to each box, and offset along the calculation section line to obtain the center coordinates of each web P2, P3, P4, and P5, thus completing the full-section positioning.

[0046] The longitudinal stiffening rib adaptive design automatically matches the start and end points, lengths, and lateral spacing of the long and short ribs with the stiffening ribs according to the gradual change of the chamber width, the stiffening rib spacing limit, and structural requirements, so as to achieve continuous and smooth stiffening ribs, reasonable stress distribution, and easy welding processing.

[0047] The entire bridge undergoes iterative optimization and drawing delivery, traversing all calculated segments of the entire bridge at 1m steps or user-specified steps, dynamically outputting the width of each box girder, web coordinates, and stiffening rib arrangement; it iteratively optimizes the box girder width distribution ratio and web alignment through AI to meet stress, structural, and aesthetic requirements; it integrates information such as main beam height, diaphragms, and crossbeams to automatically generate plan and elevation general drawings, cross-sectional drawings, and structural details, and outputs a high-precision 3D model, which is then integrated with finite element calculation and factory CNC machining systems.

[0048] The design cycle is approximately 3 days when the submission for review and approval is completed without major adjustments. When the design is adjusted, steps 1 to 5 are quickly repeated for redesign, significantly shortening the modification cycle.

[0049] It should be noted that, depending on the range of change in the width of the steel box girder bridge deck, there are three main widening design schemes.

[0050] Option 1, combined Figure 5 As shown, when the width of the steel box girder bridge deck varies little, it is common to use 1-N box cells designed for variable width, and the longitudinal stiffeners are all designed for continuous length.

[0051] Option 2, combined Figure 6 As shown, when the width of a steel box girder bridge deck varies moderately, it is often designed with 1-N box cells to accommodate varying widths, and the longitudinal stiffeners are designed with a full length plus short ribs.

[0052] Option 3, combined Figure 7 As shown, when the width of the steel box girder bridge deck varies greatly, the box girders are all designed to be wider, and the longitudinal stiffening ribs are designed as a combination of full-length and short ribs.

[0053] When the bridge is long, the design of the variable-width steel box girder often includes two or three of the above schemes 1, 2 and 3.

[0054] The following is a detailed explanation in conjunction with the attached diagram:

[0055] Known conditions can be directly obtained, including the design plane data, the left and right edge lines of the bridge, the bridge's starting and ending station numbers (in meters), the widths of the left and right cantilever arms (in mm), and the number of box girder cells. First, establish a geodetic coordinate system (see...). Figure 1 Then open the plan in CAD and pick the design line and the left and right edge lines of the bridge, for a total of 3 sets of data. The design line or edge line consists of a multi-segment, and each multi-segment contains only multiple straight lines and circular curves (see...). Figure 1 ).according to Figure 1 The data format forms three sets of planar data.

[0056] Configure a widening design scheme (widening schemes support combinations of one or more schemes). Figure 2 The principle of dynamically allocating box girder width is determined based on the bridge width. Figure 3 ).

[0057] Combination Figure 3The widening scheme is illustrated below. Based on the design alignment plane data and the left and right edge lines of the bridge, the coordinates P0 and Pm2 at the "calculation section line" (station ZH1 is known) are calculated using the plane algorithm in the "Road Survey and Design" manual. The coordinates Pz (left edge) and Py (right edge) of the bridge can be obtained from the intersection of the normal at station ZH1 and the left and right edge lines of the bridge. From Pz, Pm1, and Py, the bridge width on the left and right sides of the design alignment, and the total bridge width at the "calculation section line" can be obtained. The specific calculation method is as follows:

[0058] 1) Basic principle: In a plane rectangular coordinate system, the expression of a straight line is AX+BY+C=0, and it is called a straight line (A,B,C). A straight line can be determined by passing through two points or one point and an angle of inclination. When straight line 1 (A1,B1,C1) and straight line 2 (A2,B2,C2) are not parallel and do not coincide, then straight line 1 and straight line 2 have a unique intersection point (X1,Y1).

[0059] 2) such as Figure 4 First, according to the plane algorithm in "Road Survey and Design", calculate the coordinates of P0 at station ZH1 on the design line. The coordinates of point Pm2 are located at a very small distance to the right of P0 (station ZH2 = ZH1 + 0.001). These coordinates are used to calculate the tangent angle ANG passing through point P0 on the design line. Then, the straight line 1 passing through point P0 with an angle of ANG + 90° can be represented as (A1, B1, C1). Straight line 1 is the "calculation joint line".

[0060] 3) Traverse the left edge line data to determine the location of the intersection point of line 1 and the left edge line. The specific determination method is as follows: take two adjacent points in the left edge line data as line 2 (A2,B2,C2). For example, points Pz2 and Pz3 are line 2. Find the intersection point Pm3 of line 1 and line 2. Calculate the distance L1 between Pm3 and Pz2, the distance L2 between Pm3 and Pz3, and the distance L between Pz2 and Pz3. When L1≤L and L2≤L, the intersection point Pm3 is considered to be between Pz2 and Pz3. Otherwise, continue traversing until the location of Pm3 is determined.

[0061] 4) After determining the location of Pm3, when the radius Rz=0 at point Pz2, Pz2 and Pz3 are connected by a straight line. Pm3 is the intersection point Pz. The distance between Pm3 and P0 (basic algorithm of plane geometry) is the bridge width on the left side of the design line.

[0062] 5) After determining the location of Pm3, if the radius Rz at Pz2 > 0, then Pz2 and Pz3 are connected by a circular arc. Figure 4The specific algorithm for finding the intersection point Pm6 is as follows: First, find the midpoint Pm7 of Pz2 and Pz3. Then, based on Pz2, Pm7, Pz3, and radius Rz, find the coordinates of the center Pm4. Through point Pm4, at an angle ANG, we can obtain line 3 (A3, B3, C3). Find the intersection point Pm5 of lines 1 and 3 (lines 1 and 3 are perpendicular). Calculate the distance D1 between Pm4 and Pm5. In the right triangle formed by points Pm4, Pm5, and Pm6, the distance between points Pm4 and Pm6 is the radius Rz (the hypotenuse of the right triangle). By the Pythagorean theorem, we can find the distance D2 between points Pm5 and Pm6. By offsetting point Pm5 along line 1 by distance D2, we can obtain the coordinates Pm6. Pm6 is the intersection point Pz. The distance between points Pm6 and P0 is the width of the bridge on the left side of the design line.

[0063] 6) Calculate the Py coordinates and the right-side bridge width using the method described above. The distance between points Pz and Py is the bridge width.

[0064] 7) When the “calculation nodal line” (straight line 1) is not perpendicular to the tangent line passing through point P0, the calculation method is the same, and will not be repeated here.

[0065] 4. Following the calculation principle in step 3, based on the width of the left and right cantilever, offset the Pz or Py coordinates along the "calculation nodal line" to calculate the coordinates of P1 and P6; intelligently and dynamically allocate the remaining bridge width according to the widening design scheme, offset the P1 or P6 coordinates along the "calculation nodal line" to obtain the width of each box and the coordinates of the web center position P2, P3, P4, and P5; automatically complete the design of the longitudinal stiffening ribs according to the longitudinal stiffening rib design scheme.

[0066] 5. Following the variation pattern defined in step 2, repeat steps 3 and 4, setting a calculation segment line every 1m according to the total bridge chainage, and dynamically calculating the width of each box girder and the center coordinates of each web plate.

[0067] 6. Set other information (main beam height, diaphragm and crossbeam information, etc.) in the drawing program, draw, continuously optimize and adjust the changes in step 2, iterate repeatedly until the design requirements are met, and finally output the drawing and supplement the design details drawings.

[0068] The design cycle for submission for review and approval is generally 3 days if there are no major changes to the design or if no changes are needed. If there are changes to the design, steps 1-5 need to be repeated.

[0069] Example 2

[0070] This embodiment provides a variable-width steel box girder main body, which adopts the AI-based variable-width steel box girder design method in Embodiment 1, including a top plate, bottom plate, web plate, transverse diaphragms, longitudinal diaphragms, longitudinal stiffening ribs, and left and right cantilever arms; the center line of the web plate is automatically generated by the AI ​​algorithm, the width of the box girder is intelligently and dynamically allocated along the longitudinal direction, and the longitudinal stiffening ribs are adaptively arranged with both full-length and short ribs.

[0071] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A design method for variable-width steel box girders based on artificial intelligence, characterized in that, Includes the following steps: S1. Import basic data and establish a coordinate system. Obtain the design line plane data, the left and right edge lines of the bridge, the starting and ending station numbers, the width of the left and right cantilever arms, and the number of box cells. Establish a geodetic plane coordinate system. Pick up the three sets of polyline data of the design line, left edge line, and right edge line in CAD and form a plane coordinate sequence. S2. Set the widening scheme and box width allocation rules, with three preset widening schemes: small, medium, and large. Support the selection of a single scheme or the use of multiple schemes in combination. Formulate the dynamic allocation principle of box width based on the change range of bridge deck width and stress requirements. S3. Calculate the calculation section line and bridge width parameters. Layout several calculation section lines along the longitudinal direction of the bridge at fixed step lengths. Solve the intersection points of the calculation section lines with the left edge line and the right edge line based on the plane geometric analytical algorithm to obtain the left bridge width, right bridge width and total bridge width of each calculation section. S4. Generate the coordinates of the cantilever and web, obtain the cantilever endpoints by offsetting the cantilever width, intelligently allocate the width of each box according to the widening scheme, and obtain the center coordinates of each web. S5. The longitudinal stiffening ribs are designed to be adaptive, automatically matching the arrangement of long and short ribs according to changes in the width of the compartment. S6. Full-bridge iterative optimization and drawing output: Traverse all calculated segments of the full bridge, iteratively optimize the alignment and box width allocation through AI algorithms, and output drawings and high-precision 3D models. S7. Verification and review.

2. The design method for variable-width steel box girders based on artificial intelligence according to claim 1, characterized in that, The three widening schemes mentioned in step S2 include Scheme 1, which involves a small change in bridge width, selecting one or N box ducts to widen while keeping the width of the remaining box ducts unchanged, and arranging the longitudinal stiffening ribs along the entire length.

3. The design method for variable-width steel box girders based on artificial intelligence according to claim 2, characterized in that, The three widening schemes mentioned in step S2 include Scheme 2, which involves moderate changes in bridge width. One or N box ducts are widened while the widths of the remaining box ducts remain unchanged, and the longitudinal stiffening ribs are arranged in a combination of full-length and short ribs.

4. The design method for variable-width steel box girders based on artificial intelligence according to claim 3, characterized in that, The three widening schemes mentioned in step S2 include scheme 3, which involves widening all the box ducts when the bridge width varies greatly, and arranging the longitudinal stiffening ribs in a combination of full-length and short ribs.

5. The method according to claim 1, characterized in that, The fixed step length in step S3 is 1m or specified by the user, and the calculated segment line is the normal line at the corresponding station control point on the bridge design line.

6. The design method for variable-width steel box girders based on artificial intelligence according to claim 1, characterized in that, Step S3 uses a combination of straight line intersection and circular arc intersection algorithms to accurately determine the coordinates of the intersection point between the calculation nodal line and the edge line.

7. The design method for variable-width steel box girders based on artificial intelligence according to claim 1, characterized in that, Step S5: The longitudinal stiffening ribs are automatically adjusted according to the gradual change in box width, including the start and end points, length, and lateral spacing of the stiffening ribs, to achieve a continuous and smooth arrangement.

8. The design method for variable-width steel box girders based on artificial intelligence according to claim 1, characterized in that, Step S6 outputs a high-precision 3D model, which is directly connected to the bridge finite element calculation and factory CNC machining system.

9. The design method for variable-width steel box girders based on artificial intelligence according to claim 1, characterized in that, If step S7 fails the review, repeat steps S1-S6.

10. A variable-width steel box girder body, characterized in that, The design method for variable-width steel box girders based on artificial intelligence, as described in any one of claims 1-9, is adopted.

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