Parametric Design Method for Prestressed Anchorage System of Main Cable of Suspension Bridge

Abstract

The present invention discloses a parametric design method for the prestressed anchorage system of the main cable of a suspension bridge, which relates to the field of bridge engineering. The method includes constructing a parametric information database for the design of the anchorage system, establishing a parametric graph of the anchor structure, and solving the horizontal bending angle and vertical bending angle of a single main cable strand; grouping the main cable strands based on the anchorage type of the main cable strands, and solving the incident angles of the prestressed steel strands of different strand anchorage types; designing the spatial curve inside the anchor of the prestressed anchorage system, and designing the parametric front and rear anchor face notches, and extracting the design information and design drawings of the prestressed anchor cables. The present invention can effectively improve the work efficiency of designers.

Description

Technical Field

[0001] The present invention relates to the field of bridge engineering, and specifically to a parametric design method for the prestressed anchorage system of the main cable of a suspension bridge. Background Art

[0002] The main cable anchorage system of a suspension bridge is one of the important load-bearing components of the suspension bridge. It connects the main cable and the anchor structure, and disperses and anchors the main cable tension in the anchor block structure of the anchor. The main cable anchorage system of a suspension bridge is usually divided into a prestressed anchorage system and a steel section anchorage system. The prestressed anchorage system has many advantages such as low construction difficulty, low cost, reliable force transmission, and the ability to be replaced during the operation period. It is a commonly used main cable anchorage form for long-span suspension bridges. The prestressed anchorage system mainly consists of a prestressed system and a strand connection system. The main cable strands are connected to the prestressed tendons through connectors and transmit force to the anchor block.

[0003] Generally, the design of the prestressed anchorage system calculates coordinates and angles in the form of compiling an excel table. This calculation method has poor versatility and is extremely unintuitive. It cannot display the calculation results of data in space in real time; it cannot display the spatial position relationship between the prestressed steel bundle and the anchor body, and it is difficult for the design to judge the spatial position relationship between the prestressed steel bundle and the edge of the anchor body; at the same time, it is difficult to obtain the true three-dimensional graph of the notch by the traditional calculation method. Usually, only the center coordinates of the notch and the bottom size of the notch are given during design, and three-dimensional lofting cannot be performed to check the mutual relationship between the notches; moreover, in the traditional calculation method, the calculation and the drawing are completely separated. Summary of the Invention

[0004] Aiming at the defects existing in the prior art, the purpose of the present invention is to provide a parametric design method for the prestressed anchorage system of the main cable of a suspension bridge, which can effectively improve the work efficiency of designers.

[0005] To achieve the above purpose, the technical solution adopted by the present invention includes:

[0006] Construct a parametric information library for the design of the anchorage system, establish a parametric graph of the anchor body structure, and solve the horizontal bending angle and vertical bending angle of a single main cable strand.

[0007] Group the main cable strands based on the anchorage type of the main cable strands, and solve the incident angles of the prestressed steel strands of different strand anchorage types.

[0008] Design the spatial curve inside the anchor of the prestressed anchorage system, and design the parametric notches of the front and rear anchor faces, and extract the design information and design drawings of the prestressed anchor cables.

[0009] On the basis of the above technical solution,

[0010] The parametric information database for the anchoring system design includes the composition of the main cable strands, the cross-section of a single strand, the arrangement of the strands, the length of the dispersion cable, the layout of the front anchorage surface, the anchoring length of the anchoring system, and the anchor structure parameters;

[0011] The composition of the main cable strands includes the transverse arrangement information of the main cable, the vertical arrangement information of the main cable, and the main cable diameter;

[0012] The cross-section of a single strand includes the arrangement information of the main cable wires in a single strand, the wire diameter, and the single strand diameter;

[0013] The layout of the front anchorage surface includes the row and column arrangements of the anchoring units, as well as the transverse and vertical spacings of the anchoring units;

[0014] The anchor structure parameters are the minimum structure parameters required to determine the anchor structure, and the anchor structure parameters corresponding to different anchor structure forms are different.

[0015] Based on the above technical solution, the establishment of the parametric graph of the anchor structure is as follows:

[0016] Based on the anchor structure parameters in the parametric information database for the anchoring system design, a parametric graph of the anchor structure is established by using the visual programming method of Rhino Grasshooper software.

[0017] Based on the above technical solution, the solution of the horizontal bending angle and vertical bending angle of a single main cable strand is as follows:

[0018] Based on the parametric information database for the anchoring system design, combined with the cross-section of a single strand, the strand arrangement, and the dispersion cable length information, the horizontal bending angle and vertical bending angle of a single main cable strand are determined.

[0019] Based on the above technical solution,

[0020] The horizontal bending angle and vertical bending angle of a single main cable strand are the angles in the local coordinate system of the anchoring system;

[0021] The origin of the local coordinate system of the anchoring system is the IP point of the dispersion saddle, the X-axis is projected from the coordinate origin to the front anchorage surface and is perpendicular to the front anchorage surface, the Y-axis is the transverse direction of the bridge, and the Z-axis is determined by the right-hand rule in combination with the X-axis and Y-axis.

[0022] Based on the above technical solution, according to the anchoring type of the main cable strands, the main cable strands are grouped, and the incident angles of the prestressed steel strands of different strand anchoring types are solved, specifically as follows:

[0023] Based on the anchorage type of the main cable strands, the main cable strands are divided into a single-strand anchorage type group and a double-strand anchorage type group, and the incident angles of the prestressed steel strands for the single-strand anchorage type and the double-strand anchorage type are solved.

[0024] On the basis of the above technical solution,

[0025] The prestressed steel strands correspond one by one to the single-bundle anchor rods or double-bundle anchor rods they are connected to;

[0026] Determine the incident angle of the prestressed steel strand for the single-strand anchorage type according to the angle of the single strand connected to the single-bundle anchor rod, and determine the incident angle of the prestressed steel strand for the double-strand anchorage type according to the angle of the double strands connected to the double-bundle anchor rod;

[0027] The incident angle of the prestressed steel strand for the single-strand anchorage type connected to the single-bundle anchor rod is the same as the dispersion angle of the single strand, and the incident angle of the prestressed steel strand for the double-strand anchorage type connected to the double-bundle anchor rod is equal to the average angle of the two strands of the double strands.

[0028] On the basis of the above technical solution, design the spatial curve inside the anchor body of the prestressed anchorage system. The specific steps include:

[0029] Determine the bending mode of the prestressed steel bundle. The bending modes include a horizontal bending mode, a vertical bending mode, and a straight dispersion mode;

[0030] Convert the incident angles of the prestressed steel strands for the single-strand anchorage type and the double-strand anchorage type in the local coordinate system of the anchorage system into unit vectors in the local coordinate system of the anchorage system;

[0031] Determine the distance from the nominal anchor point center K on the front anchor face to the intersection point JD of the spatial curve of the prestressed steel strand;

[0032] Project the nominal anchor point center K on the front anchor face along the unit vector direction to the rear anchor face, and based on the bending mode of the prestressed steel bundle, obtain the nominal anchorage point coordinates of the prestressed steel bundle on the rear anchor face accordingly;

[0033] When the bending mode of the prestressed steel bundle is the horizontal bending mode or the vertical bending mode, set the horizontal bending or vertical bending radius of the prestressed steel bundle. Each prestressed steel strand performs an inverted circular arc with the set radius length in the preset plane to form a prestressed spatial alignment. The preset plane is determined by the nominal anchor point center on the front anchor face, the intersection point JD from the nominal anchor point center on the front anchor face to the spatial curve of the prestressed steel strand, and the nominal anchorage point of the prestressed steel bundle on the rear anchor face;

[0034] Calculate the coordinates of the starting point N and the ending point M of the circular arc.

[0035] On the basis of the above technical solution, the parametric design of the front and rear anchor surface notch is carried out, and the specific steps include:

[0036] Determine the distance L1 from the center K point of the nominal anchorage point of the prestressed steel strand on the front anchor surface to the actual anchorage point Q point;

[0037] Determine the distance L2 from the center H point of the nominal anchorage point of the prestressed steel strand on the rear anchor surface to the actual anchorage point I point;

[0038] According to the distance L1, the distance L2, the coordinates of point H, the coordinates of point K, the vector and the vector , solve to obtain the coordinates of the center point of the front anchor surface notch and the coordinates of the center point of the rear anchor surface notch;

[0039] Based on the square size of the bottom surface of the notch, establish a three-dimensional structure of the notch. Among them, the four side surfaces of the three-dimensional structure of the notch are all at an angle of 135° with the bottom surface of the notch, and the four corner points of the bottom surface are the intersection points of the planes where the four side surfaces are located and the plane where the bottom surface of the rear anchor surface is located.

[0040] On the basis of the above technical solution,

[0041] The design information includes the coordinates, angles, lengths of the prestressed anchor cables, and the coordinates of the notch center, and the design information is stored in a matrix and written into an Excel file;

[0042] Through the graphic baking function in Rhino Grasshooper software, generate CAD drawings for the three-dimensional geometric data in the design of the spatial curve inside the anchor body of the prestressed anchorage system and the parametric design of the front and rear anchor surface notches;

[0043] The parametric design method of the prestressed anchorage system of the main cable of the suspension bridge is based on Rhino Grasshooper software.

[0044] Compared with the prior art, the advantages of the present invention are as follows: By adopting the method of writing algorithm programs, mechanical repetitive operations and a large number of logical evolution processes can be replaced by the loop operations of the computer, and the modification results can be directly obtained by modifying the parameters, thus effectively improving the work efficiency of designers; moreover, the present invention can greatly improve the data transferability and expandability, and the obtained results are not limited to design drawings, but can also be transplanted into finite element software for finite element analysis, or presented in a three-dimensional manner through video streaming media and visualization solutions. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0046] Figure 1 It is a flowchart of a parametric design method for the prestressed anchorage system of the main cable of a suspension bridge in an embodiment of the present invention;

[0047] Figure 2 It is a schematic cross-sectional view of the main cable strands;

[0048] Figure 3 It is a schematic layout diagram of the front anchor face;

[0049] Figure 4 It is an arrangement diagram of the strand anchorage;

[0050] Figure 5 It is a schematic spatial diagram of the flat-curved prestressed steel bundle;

[0051] Figure 6 It is a schematic spatial diagram of the vertical-curved prestressed steel bundle;

[0052] Figure 7 It is a bending schematic diagram of the prestressed steel bundle in the local coordinate system of the anchorage system;

[0053] Figure 8 It is a schematic spatial diagram of the front or rear anchor face notch of a single prestressed steel bundle;

[0054] Figure 9 It is a schematic spatial diagram of 1 / 2 of the rear anchor face notch. Specific embodiments

[0055] A parametric design method for the prestressed anchorage system of the main cable of a suspension bridge provided by an embodiment of the present invention can realize an integrated solution for the design calculation and drawing of the prestressed anchorage system of the suspension bridge by adopting visual programming technology, and has the advantages of high efficiency, high calculation accuracy, and low error rate. Figure 1

[0056] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, rather than all, of the embodiments of the present application.

[0057] See Figure 1 As shown, a parametric design method for the prestressed anchorage system of the main cable of a suspension bridge provided by an embodiment of the present invention specifically includes the following steps:

[0058] S1: Construct a parametric information database for the design of the anchoring system, establish a parametric graph of the anchor body structure, and solve the horizontal bending angle and vertical bending angle of a single main cable strand; see Figure 2 As shown in Figure 2 , the numbers in it are the numbers of the main cable strands.

[0059] In a possible implementation, the parametric design module of the anchor body structure can be established, and the parametric design module of the anchor body structure is used to establish a parametric graph of the anchor body structure.

[0060] In the embodiment of the present invention, the parametric information database for the design of the anchoring system includes the composition of the main cable strands, the cross-section of a single strand, the arrangement of the strands, the length of the scattered strands, the layout of the front anchor face, the anchoring length of the anchoring system, and the parameters of the anchor body structure; the composition of the main cable strands includes the horizontal arrangement information of the main cable, the vertical arrangement information of the main cable, and the main cable diameter; the cross-section of a single strand includes the arrangement information of the main cable wires of a single strand, the wire diameter, and the diameter of a single strand; the layout of the front anchor face includes the row and column arrangements of the anchoring units, as well as the horizontal and vertical spacings of the anchoring units; the parameters of the anchor body structure are the minimum structural parameters required to determine the anchor body structure, and the anchor body structure parameters corresponding to different anchor body construction forms are different.

[0061] S2: Group the main cable strands based on the anchoring type of the main cable strands, and solve the incident angles of the prestressed steel strands of different strand anchoring types;

[0062] In a possible implementation, a grouping module can be established, and the grouping module is used to group the main cable strands based on the anchoring type of the main cable strands.

[0063] In a possible implementation, an incident angle module of the prestressed anchoring system can be established, and the incident angle module of the prestressed anchoring system is used to solve the incident angles of the prestressed steel strands of different strand anchoring types.

[0064] S3: Design the spatial curve inside the anchor of the prestressed anchoring system, and design the parameterization of the front and rear anchor face notches, and extract the design information and design drawings of the prestressed anchor cables.

[0065] In a possible implementation, a spatial curve design module inside the anchor of the prestressed anchoring system can be established, and the spatial curve design module inside the anchor of the prestressed anchoring system is used to design the spatial curve inside the anchor of the prestressed anchoring system.

[0066] In a possible implementation, a parameterization design module for the front and rear anchor face notches can be established, and the parameterization design module for the front and rear anchor face notches is used to design the parameterization of the front and rear anchor face notches.

[0067] In a possible implementation, it can be done through a post-processing module, which is used to batch extract the design information and design drawings of the prestressed anchor cables.

[0068] In the embodiment of the present invention, the establishment of the parametric graph of the anchor body structure is specifically as follows:

[0069] Based on the anchor body structure parameters in the parametric information library of the anchoring system design, a parametric graph of the anchor body structure is established by using the visual programming method of Rhino Grasshooper software.

[0070] In the embodiment of the present invention, the solution of the horizontal bending angle and vertical bending angle of a single main cable strand is specifically as follows:

[0071] Based on the parametric information library of the anchoring system design, combined with the cross-section of a single strand, the strand arrangement and the information of the dispersion cable length, the horizontal bending angle and vertical bending angle of a single main cable strand are determined.

[0072] In the embodiment of the present invention, the horizontal bending angle and vertical bending angle of a single main cable strand are the angles in the local coordinate system of the anchoring system; the origin of the local coordinate system of the anchoring system is the IP point of the dispersion saddle, the X-axis is the direction from the coordinate origin to the front anchor face and is perpendicular to the front anchor face, the Y-axis is the transverse direction of the bridge, and the Z-axis is determined by the right-hand rule combining the X-axis and the Y-axis.

[0073] See Figure 3 As shown, it is a schematic diagram of the front anchor face layout. Figure 3 In it, the smaller square represents a single-strand anchor connector, and the larger square represents a double-strand anchor connector. Figure 4 It is a layout diagram of the strand anchoring. Figure 4 The numbers in it represent the main cable strand numbers. In the embodiment of the present invention, based on the anchoring type of the main cable strands, the main cable strands are grouped, and the incident angles of the prestressed steel strands of different strand anchoring types are solved, specifically as follows:

[0074] Based on the anchoring type of the main cable strands, the main cable strands are divided into a single-strand anchoring type group and a double-strand anchoring type group, and the incident angles of the prestressed steel strands of the single-strand anchoring type and the double-strand anchoring type are solved. The prestressed steel strand corresponds one-to-one with the single-bundle anchor rod or double-bundle anchor rod it is connected to; the incident angle of the prestressed steel strand of the single-strand anchoring type is determined according to the angle of the single strand connected to the single-bundle anchor rod, and the incident angle of the prestressed steel strand of the double-strand anchoring type is determined according to the angle of the double strands connected to the double-bundle anchor rod; the incident angle of the prestressed steel strand of the single-strand anchoring type connected to the single-bundle anchor rod is the same as the dispersion angle of the single strand, and the incident angle of the prestressed steel strand of the double-strand anchoring type connected to the double-bundle anchor rod is equal to the average angle of the two strands of the double strand.

[0075] In the embodiments of the present invention, the design of the spatial curve inside the anchor body of the prestressed anchorage system is carried out. The specific steps include:

[0076] S301: Determine the bending mode of the prestressed tendon. The bending modes include the horizontal bending mode, the vertical bending mode, and the straight cable-dispersing mode. It should be noted that the straight cable-dispersing mode means that the prestressed tendon neither bends horizontally nor vertically. Figure 5 This is a schematic diagram of the spatial layout of the horizontally bent prestressed tendon in the present invention. Figure 6 This is a schematic diagram of the spatial layout of the vertically bent prestressed tendon. The following points given have been marked in Figure 5 and Figure 6 respectively. Figure 7 This is a bending schematic diagram of the prestressed tendon in the local coordinate system of the anchorage system.

[0077] S302: Convert the incident angles of the single-strand-anchoring-type prestressed steel strands and the double-strand-anchoring-type prestressed steel strands in the local coordinate system of the anchorage system into unit vectors in the local coordinate system of the anchorage system. The unit vector can be expressed as .

[0078] S303: Determine the distance d from the center K of the nominal anchor point on the front anchor face to the intersection point JD of the spatial curve of the prestressed steel strand. Set the coordinates of the center of the nominal anchor point on the front anchor face as ), then the coordinates of the intersection point JD of the prestressed steel strand are ).

[0079] S304: Project the center K of the nominal anchor point on the front anchor face along the direction of the unit vector to the rear anchor face, and accordingly obtain the nominal anchorage point coordinates of the prestressed steel strand on the rear anchor face based on the bending mode of the prestressed steel strand;

[0080] Specifically, project the center K of the nominal anchor point on the front anchor face along the direction of the unit vector to the rear anchor face to obtain the coordinates (x2, y2, z2). If the bending mode of the prestressed steel strand is the horizontal bending mode, then determine the horizontal bending coefficient m in this step. The coordinates of the nominal anchorage point H of the prestressed steel strand on the rear anchor face are (x2, m×y2, z2). As shown in Figure 5 , the horizontal bending coefficient m in this embodiment is 0.75. If the bending mode of the prestressed steel strand is the vertical bending mode, then determine the vertical bending coefficient n in this step. The coordinates of the nominal anchorage point H of the prestressed steel strand on the rear anchor face are (x2, y2, n×z2). As shown in Figure 6 , the vertical bending coefficient n in this embodiment is 0.75. If the bending mode of the prestressed steel strand is the straight cable-dispersing mode, then the coordinates of the nominal anchorage point J on the rear anchor face are (x2, y2, z2). The straight cable-dispersing mode can be transformed from the horizontal bending mode or the vertical bending mode, and the corresponding horizontal bending coefficient m or vertical bending coefficient n for the straight cable-dispersing mode is 1.

[0081] S305: When the bending mode of the prestressed steel tendon is the flat bending mode or the vertical bending mode, set the flat bending or vertical bending radius of the prestressed steel tendon. Each prestressed steel strand forms a prestressed space linear shape by performing an inverted circular arc with the set radius length in the preset plane. The preset plane is determined by the center of the nominal anchorage point of the front anchorage surface, the intersection JD point of the center of the nominal anchorage point of the front anchorage surface to the space curve of the prestressed steel strand, and the nominal anchorage point of the prestressed steel tendon on the rear anchorage surface. When the bending mode of the prestressed steel tendon is the flat bending mode, set the flat bending radius of the prestressed steel tendon. When the bending mode of the prestressed steel tendon is the vertical bending mode, set the vertical bending radius of the prestressed steel tendon.

[0082] S306: Calculate the coordinates of the starting point N and the ending point M of the circular arc.

[0083] In the embodiment of the present invention, parametric design of the front and rear anchorage surface notch is carried out. The specific steps include:

[0084] S307: Determine the distance L1 from the center K of the nominal anchorage point of the prestressed steel strand on the front anchorage surface to the actual anchorage point Q. Figure 8 It is a schematic diagram of the space of the front anchorage surface or rear anchorage surface notch for a single prestressed steel tendon. Figure 9 It is a schematic diagram of the 1 / 2 rear anchorage surface notch space.

[0085] S308: Determine the distance L2 from the center H of the nominal anchorage point of the prestressed steel strand on the rear anchorage surface to the actual anchorage point I. In a possible implementation, the values of both L1 and L2 are 15 cm.

[0086] S309: According to the distance L1, the distance L2, the coordinates of point H, the coordinates of point K, the vector and the vector , solve to obtain the coordinates of the center point (point Q) of the front anchorage surface notch and the coordinates of the center point (point I) of the rear anchorage surface notch;

[0087] S310: Based on the square size of the notch bottom surface, establish a three-dimensional structure of the notch. Among them, the four side surfaces of the three-dimensional structure of the notch are all at an angle of 135° with the notch bottom surface, and the four corner points of the bottom surface are the intersection points of the planes where the four side surfaces are located and the plane where the rear anchorage surface bottom surface is located.

[0088] For the meanings of the points shown in the drawings of the present invention, the specific descriptions are as follows: Point K represents the nominal anchorage point of the prestressed steel tendon on the front anchorage surface; Point Q represents the center point of the front anchorage surface notch; Point N represents the starting point of the circular arc section of the prestressed steel tendon; Point JD represents the intersection point of the circular arc wire of the prestressed steel tendon; Point M represents the ending point of the circular arc section of the prestressed steel tendon; Point I represents the center point of the rear anchorage surface notch; Point H represents the nominal anchorage point of the prestressed steel tendon on the rear anchorage surface; Point A represents the nominal anchorage point of the prestressed steel tendon on the rear anchorage surface in the straight cable-dispersed manner.

[0089] In the embodiments of the present invention, the design information includes the coordinates, angles, and lengths of the prestressed anchor cables, as well as the coordinates of the center of the notch. The design information is stored in a matrix, written into an Excel file, and the batch writing method is adopted.

[0090] Through the graphic baking function in the Rhino Grasshooper software, the three-dimensional geometric data in the design of the internal space curve of the anchor body of the prestressed anchoring system and the parametric design of the front and rear anchor face notches are generated into CAD drawings for design drawing use.

[0091] All steps of the parametric design method of the main cable prestressed anchoring system of the suspension bridge of the present invention are based on the Rhino Grasshooper software, and the operation results of each step can be viewed in real time.

[0092] In the embodiments of the parametric design method of the main cable prestressed anchoring system of the suspension bridge of the present invention, by writing an algorithm program, mechanical repetitive operations and a large number of logical evolution processes can be replaced by the loop operation of the computer. The scheme adjustment can also directly obtain the modification result by modifying the parameters, thereby effectively improving the work efficiency of designers. Moreover, the present invention can greatly improve the data transferability and scalability. The obtained results are not limited to design drawings, but can also be transplanted into finite element software for finite element analysis, or presented in three dimensions in the form of video streaming media and visualization schemes.

[0093] The above are only specific embodiments of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features claimed herein.

[0094] The present invention is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to embodiments of the present invention. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of flows and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, such that the instructions executed by the processor of the computer or other programmable data processing devices generate means for implementing the functions specified in Figure 1 one or more flows or blocks Figure 1 one or more blocks.

Claims

1. A parametric design method for the prestressed anchorage system of the main cable of a suspension bridge, characterized in that, Specifically, it includes the following steps: Construct a parametric information database for the design of the anchoring system, establish a parametric graph of the anchor body structure, and solve the horizontal bending angle and vertical bending angle of a single main cable strand; Based on the anchoring type of the main cable strands, group the main cable strands and solve the incident angles of the prestressed steel strands for different strand anchoring types; Design the spatial curve inside the anchor body of the prestressed anchoring system, and design the parametric front and rear anchor face notches, and extract the design information and design drawings of the prestressed anchor cables; Among them, the parametric information database for the design of the anchoring system includes the composition of the main cable strands, the cross-section of a single strand, the strand arrangement, the length of the loose strands, the layout of the front anchor face, the anchoring length of the anchoring system, and the anchor body structure parameters; The composition of the main cable strands includes the horizontal arrangement information of the main cable, the vertical arrangement information of the main cable, and the main cable diameter; The cross-section of a single strand includes the arrangement information of the main cable wires of a single strand, the wire diameter, and the diameter of a single strand; The layout of the front anchor face includes the row and column arrangements of the anchoring units, as well as the horizontal and vertical spacings of the anchoring units; The anchor body structure parameters are the minimum structure parameters required to determine the anchor body structure, and the anchor body structure parameters corresponding to different anchor body construction forms are different; Among them, the step of grouping the main cable strands based on the anchoring type of the main cable strands and solving the incident angles of the prestressed steel strands for different strand anchoring types is specifically as follows: Based on the anchoring type of the main cable strands, divide the main cable strands into a single-strand anchoring type group and a double-strand anchoring type group, and solve the incident angles of the prestressed steel strands for the single-strand anchoring type and the incident angles of the prestressed steel strands for the double-strand anchoring type; Among them, the prestressed steel strand corresponds one-to-one with the single-bundle anchor rod or double-bundle anchor rod it is connected to; Determine the incident angle of the prestressed steel strand for the single-strand anchoring type according to the angle of the single strand connected to the single-bundle anchor rod, and determine the incident angle of the prestressed steel strand for the double-strand anchoring type according to the angle of the double strands connected to the double-bundle anchor rod; The incident angle of the prestressed steel strand for the single-strand anchoring type connected to the single-bundle anchor rod is the same as the loose strand angle of the single strand, and the incident angle of the prestressed steel strand for the double-strand anchoring type connected to the double-bundle anchor rod is equal to the average angle of the two strands of the double strands.

2. The parametric design method of the prestressed anchorage system for the main cable of a suspension bridge according to claim 1, characterized in that The step of establishing the parametric graph of the anchor body structure is specifically as follows: Based on the anchor body structure parameters in the parametric information database for the design of the anchoring system, establish a parametric graph of the anchor body structure by using the visual programming method of Rhino Grasshooper software.

3. A parametric design method for the prestressed anchorage system of the main cable of a suspension bridge according to claim 1, characterized in that, The step of solving the horizontal bending angle and vertical bending angle of a single main cable strand is specifically as follows: Based on the parametric information database for the design of the anchoring system, combine the cross-section of a single strand, the strand arrangement, and the loose strand length information to determine the horizontal bending angle and vertical bending angle of a single main cable strand.

4. The parametric design method for the prestressed anchoring system of the main cable of a suspension bridge according to claim 3, wherein: The horizontal bending angle and vertical bending angle of a single main cable strand are the angles in the local coordinate system of the anchoring system; The origin of the local coordinate system of the anchoring system is the IP point of the cable saddle. The X-axis projects from the origin of coordinates towards the front anchorage face and is perpendicular to the front anchorage face. The Y-axis is in the transverse direction of the bridge, and the Z-axis is determined by the right-hand rule combining the X-axis and the Y-axis.

5. A parametric design method for the prestressed anchorage system of the main cable of a suspension bridge according to claim 1, characterized in that, The design of the spatial curve inside the anchor body of the prestressed anchoring system is carried out, and the specific steps include: Determine the bending modes of the prestressed steel strands, and the bending modes include the flat bending mode, the vertical bending mode, and the straight cable-dispersion mode; Convert the incident angles of the single-strand-anchoring-type prestressed steel wires and the double-strand-anchoring-type prestressed steel wires in the local coordinate system of the anchoring system into unit vectors in the local coordinate system of the anchoring system; Determine the distance from the nominal anchor point center K point on the front anchorage face to the intersection point JD of the spatial curve of the prestressed steel strand; Project the nominal anchor point center K point on the front anchorage face along the unit vector direction to the rear anchorage face, and based on the bending mode of the prestressed steel strand, obtain the nominal anchorage point coordinates of the prestressed steel strand on the rear anchorage face accordingly; When the bending mode of the prestressed steel strand is the flat bending mode or the vertical bending mode, set the flat bending or vertical bending radius of the prestressed steel strand. Each prestressed steel wire performs an inverted circular arc with the set radius length in the preset plane, forming a prestressed spatial alignment. The preset plane is determined by the nominal anchor point center on the front anchorage face, the intersection point JD from the nominal anchor point center on the front anchorage face to the spatial curve of the prestressed steel strand, and the nominal anchorage point of the prestressed steel strand on the rear anchorage face; Calculate the coordinates of the starting point N and the ending point M of the circular arc.

6. The parametric design method of the prestressed anchorage system for the main cable of a suspension bridge according to claim 5, characterized in that, The parametric design of the front and rear anchorage face notches is carried out, and the specific steps include: Determine the distance L1 from the nominal anchorage point center K point of the prestressed steel strand on the front anchorage face to the actual anchorage point Q point; Determine the distance L2 from the nominal anchorage point center H point of the prestressed steel strand on the rear anchorage face to the actual anchorage point I point; According to the distance L1, the distance L2, the coordinates of point H, the coordinates of point K, the vector and the vector , the coordinates of the center point of the front anchor surface notch and the coordinates of the center point of the rear anchor surface notch are obtained by solving; Based on the square size of the notch bottom surface, establish a three-dimensional structure of the notch. Among them, the four side surfaces of the three-dimensional structure of the notch are all at an angle of 135° with the notch bottom surface, and the four corner points of the bottom surface are the intersection points of the planes where the four side surfaces are located and the plane where the bottom surface of the rear anchorage face is located.

7. The parametric design method of the main cable prestressed anchoring system of a suspension bridge according to claim 6, characterized in that: The design information includes the coordinates, angles, lengths of the prestressed anchor cables, and the notch center coordinates, and the design information is stored in a matrix and written into an Excel file; Through the graphic baking function in the Rhino Grasshooper software, generate CAD drawings for the three-dimensional geometric data in the design of the spatial curve inside the anchor body of the prestressed anchoring system and the parametric design of the front and rear anchorage face notches; The parametric design method of the main cable prestressed anchoring system of the suspension bridge is based on the Rhino Grasshooper software.

Images