Method for determining design parameters of main tower structure and main tower structure

Abstract

The present invention discloses a method for determining design parameters of a main tower structure and the main tower structure, which relates to the technical field of main tower structure design. The method includes obtaining a first outward lateral bending moment generated by the self-weight of the main tower at the cross beam of the main tower according to the initial lateral inclination angle, the initial cross-section eccentricity, the size and the self-weight of the main tower; determining a second outward lateral bending moment and an inward lateral bending moment generated by the cable forces of the completed bridge at the cross beam of the main tower according to the cable forces of the completed bridge of the stay cables, the sizes and the angles of the stay cables; and determining the final lateral inclination angle and the final cross-section eccentricity of the main tower by adjusting the initial lateral inclination angle and the initial cross-section eccentricity of the main tower so that the sum of the first outward lateral bending moment and the second outward lateral bending moment satisfies the relationship with the inward lateral bending moment. The problems in the prior art that when designing the cross-section, it is necessary to increase the cross-section to meet the requirements of cross-section strength and stiffness, and the too large cross-section will cause a greater bending moment, resulting in a complex structural design process and a large lateral design bending moment are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of the design of the main tower structure of a bridge, and particularly relates to a method for determining the design parameters of the main tower structure and the main tower structure. Background Art

[0002] The main tower is a main load-bearing component of a cable-stayed bridge. The loads of the upper structure of the cable-stayed bridge are transmitted to the foundation through the main tower. Different tower shapes have different stress characteristics and also affect the stiffness of the main bridge. The selection of the tower shape is closely related to the construction conditions such as the geological structure at the bridge site, the wind speed, and the seismic intensity. At the same time, from the perspective of landscape, the main tower is a landmark component of the cable-stayed bridge and is the most malleable part of the cable-stayed bridge. Different shapes can express different landscape themes and implications. The selection of the tower type needs to consider the coordination of the structure itself, and then through the treatment of the appearance and structural details of the main tower, fully integrate human and natural elements, endow the bridge with cultural connotations, and fully reflect the regional cultural characteristics of the bridge.

[0003] The double-column out-of-plane inclined main tower does not have an upper cross beam, and only has a main tower cross beam to support the main beam. Above the bridge deck, they are separated from each other, straight and tall, simple and fresh, giving people a strong sense of lines and beauty of strength; at the same time, the double-column main tower is slightly out-of-plane inclined. When the main beam adopts an inclined main truss section, it forms a consistent sense of rhythm with the main beam. The appearance is simple, the lines are smooth, and it is extremely beautiful. It is widely used in urban cable-stayed bridges and is very landmark.

[0004] For common single-column towers, diamond towers or H-shaped towers, the components generated by the self-weight of the main tower and the inclination of the stay cables can cancel each other out or be transmitted by the main tower cross beam. For the double-column out-of-plane inclined main tower without an upper cross beam, the out-of-plane inclination angle of the main tower and the eccentricity of the main tower section directly affect the transverse bending moment at the main tower cross beam. In the prior art, if the transverse bending moment is too large, the cross section needs to be enlarged during cross section design to meet the requirements of cross section strength and stiffness, and the too large cross section will cause a greater bending moment, resulting in a complex structural design process and a large transverse design bending moment. Summary of the Invention

[0005] Aiming at the defects existing in the prior art, the purpose of the present invention is to provide a method for determining the design parameters of the main tower structure and the main tower structure, which can solve the problems in the prior art that the cross section needs to be enlarged during cross section design to meet the requirements of cross section strength and stiffness, and the too large cross section will cause a greater bending moment, resulting in a complex structural design process and a large transverse design bending moment.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0007] On the one hand, this solution provides a method for determining the design parameters of the main tower structure, including the following steps:

[0008] According to the initial lateral inclination angle of the main tower, the initial cross-section eccentricity, the main tower dimensions and self-weight, obtain the first outward lateral bending moment generated by the self-weight of the main tower at the main tower cross beam;

[0009] According to the completed bridge cable forces of the stay cables, the stay cable dimensions and angles, determine the second outward lateral bending moment and the inward lateral bending moment generated by the completed bridge cable forces at the main tower cross beam;

[0010] By adjusting the initial lateral inclination angle and the initial cross-section eccentricity of the main tower, make the sum of the first outward lateral bending moment and the second outward lateral bending moment satisfy the relationship with the inward lateral bending moment, and determine the final lateral inclination angle and the final cross-section eccentricity of the main tower.

[0011] In some alternative solutions, the step of obtaining the first outward lateral bending moment generated by the self-weight of the main tower at the main tower cross beam according to the initial lateral inclination angle of the main tower, the initial cross-section eccentricity, the main tower dimensions and self-weight includes:

[0012] According to the dimensions and self-weight of each segment of the main tower, calculate the outward lateral bending moment generated by the self-weight of each segment of the main tower respectively;

[0013] Sum up the outward lateral bending moments generated by the self-weight of each segment of the main tower to determine the first outward lateral bending moment.

[0014] In some alternative solutions, according to the formula: M Ai = G i (Δ i + y i tanθ0), obtain the outward lateral bending moment generated by the self-weight of each segment of the main tower at the main tower cross beam;

[0015] According to the formula: Obtain the first outward lateral bending moment;

[0016] where i = 1 to n1, n1 is the number of segments of the main tower, M Ai is the outward lateral bending moment generated by the self-weight of the i-th segment of the main tower at the main tower cross beam, G i is the gravity of the i-th segment of the main tower, Δ i is the eccentricity of the i-th segment of the main tower, y i is the vertical distance from the centroid of the i-th segment of the main tower to the main tower cross beam, θ0 is the initial lateral inclination angle of the main tower, M A is the first outward lateral bending moment.

[0017] In some alternative solutions, the step of determining the second outward lateral bending moment generated by the completed bridge cable forces at the main tower cross beam according to the completed bridge cable forces of the stay cables, the stay cable dimensions and angles includes:

[0018] According to the completed bridge cable forces, the stay cable dimensions and angles of each stay cable, obtain the outward lateral bending moment generated by each stay cable;

[0019] Sum the outward lateral bending moments generated by each stay cable to determine the second outward lateral bending moment.

[0020] In some alternative solutions, according to the formula: M Bi = T i ·cosα i ·cosγ i ·l i ·tanθ0, obtain the outward lateral bending moment generated by each stay cable;

[0021] According to the formula: Obtain the second outward lateral bending moment;

[0022] where i = 1 to n2, n2 is the number of stay cables, M Bi is the outward lateral bending moment generated by the i-th stay cable, T i is the cable force of the i-th stay cable, α i is the longitudinal angle between the i-th stay cable and the vertical plane, γ i is the lateral angle between the i-th stay cable and the vertical plane, l i is the vertical distance from the theoretical anchorage point of the i-th stay cable to the main tower crossbeam, M B is the second outward lateral bending moment.

[0023] In some alternative solutions, the determining of the inward lateral bending moment generated by the as-built cable force at the main tower crossbeam according to the as-built cable force, size and angle of the stay cable includes:

[0024] Obtain the inward lateral bending moment generated by each stay cable according to the as-built cable force, size and angle of each stay cable;

[0025] Sum the inward lateral bending moments generated by each stay cable to determine the inward lateral bending moment generated by the as-built cable force at the main tower crossbeam.

[0026] In some alternative solutions, according to the formula: M Ci = T1·cosα i ·sinγ i ·l i , obtain the inward lateral bending moment generated by each stay cable;

[0027] According to the formula: Obtain the inward lateral bending moment generated by the as-built cable force at the main tower crossbeam;

[0028] where M Ci is the inward lateral bending moment generated by the i-th stay cable, M C is the inward lateral bending moment generated by the as-built cable force at the main tower crossbeam.

[0029] In some alternative solutions, determining the final lateral inclination angle and the final sectional eccentricity of the main tower by adjusting the initial lateral inclination angle and the initial sectional eccentricity of the main tower so that the sum of the first outward lateral bending moment and the second outward lateral bending moment satisfies the relationship with the inward lateral bending moment includes:

[0030] Adjust the initial lateral inclination angle and the initial sectional eccentricity of the main tower so that M A +M B =M C , that is: The lateral inclination angle and the sectional eccentricity of the main tower that satisfy the equation are the final lateral inclination angle and the final sectional eccentricity of the main tower.

[0031] On the other hand, this solution provides a main tower structure, and the design parameters of the main tower structure are determined by the above-mentioned main tower structure design parameter determination method.

[0032] In some alternative solutions, it includes:

[0033] Two tower columns, and the tower columns are respectively inclined outward at a set angle along the transverse bridge direction;

[0034] A main tower cross beam, which is connected between the two tower columns;

[0035] The cross section of the tower column is a single-cell single-chamber cross section or a single-cell multi-chamber cross section, and the material of the tower column is reinforced concrete or steel structure;

[0036] The cross section of the main tower cross beam is a single-cell single-chamber cross section or a single-cell multi-chamber cross section, and the material of the main tower cross beam is reinforced concrete or steel structure.

[0037] Compared with the prior art, the advantages of the present invention are as follows: According to the initial lateral inclination angle of the main tower, the initial sectional eccentricity, the main tower size and self-weight, this solution obtains the first outward lateral bending moment generated by the main tower self-weight at the main tower cross beam; according to the completed bridge cable force of the stay cables, the stay cable size and angle, it determines the second outward lateral bending moment and the inward lateral bending moment generated by the completed bridge cable force at the main tower cross beam; by adjusting the initial lateral inclination angle and the initial sectional eccentricity of the main tower, so that the sum of the first outward lateral bending moment and the second outward lateral bending moment satisfies the relationship with the inward lateral bending moment, and determines the final lateral inclination angle and the final sectional eccentricity of the main tower. By adjusting the lateral inclination angle and the sectional eccentricity of the main tower, the lateral bending moment at the main tower cross beam in the completed bridge state is made zero, thereby determining the lateral inclination angle of the main tower and the sectional eccentricity of the main tower. It solves the problems in the prior art that when designing the cross section, it is necessary to increase the cross section to meet the requirements of cross section strength and stiffness, and the too large cross section will cause a greater bending moment, resulting in a complex structural design process and a large lateral design bending moment. Description of the Drawings

[0038] 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 be obtained based on these drawings.

[0039] Figure 1 It is a schematic diagram of the steps of the method for determining the design parameters of the main tower structure in the embodiments of the present invention;

[0040] Figure 2 It is a schematic diagram of the main tower structure in the embodiments of the present invention;

[0041] Figure 3 It is a schematic diagram of the arrangement of the stay cables in the embodiments of the present invention;

[0042] Figure 4 It is a schematic diagram of the outward lateral bending moment force generated by the self-weight and the vertical component force of the stay cables at the main tower crossbeam in the embodiments of the present invention;

[0043] Figure 5 It is a schematic diagram of the inward lateral bending moment force generated by the horizontal component force of the stay cables at the main tower crossbeam in the embodiments of the present invention;

[0044] Figure 6 It is a schematic diagram of the eccentricity of the main tower cross-section in the embodiments of the present invention.

[0045] In the figure: 1. Tower column; 2. Main tower crossbeam; 3. Stay cable; 4. Main girder. Specific embodiments

[0046] 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 part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts belong to the scope of protection of the present application.

[0047] The following will further elaborate on the embodiments of the present invention with reference to the accompanying drawings.

[0048] As Figure 1 shown, on the one hand, the present invention provides a method for determining the design parameters of the main tower structure, including the following steps:

[0049] S1: Obtain the first outward lateral bending moment generated by the self-weight of the main tower at the main tower crossbeam according to the initial lateral outward inclination angle of the main tower, the initial cross-section eccentricity, the main tower size, and the self-weight.

[0050] In some alternative embodiments, according to the dimensions and self-weights of each segment of the main tower, the outward lateral bending moments generated by the self-weights of each segment of the main tower are calculated respectively.

[0051] The outward lateral bending moments generated by the self-weights of each segment of the main tower are summed to determine the first outward lateral bending moment.

[0052] As Figure 4 shown, in some alternative embodiments, according to the formula: M Ai = G i (Δ i + y i tanθ0), the outward lateral bending moment generated by the self-weights of each segment of the main tower at the main tower cross beam is obtained.

[0053] According to the formula: The first outward lateral bending moment is obtained.

[0054] where i = 1 to n1, n1 is the number of segments of the main tower, M Ai is the outward lateral bending moment generated by the self-weight of the i-th segment of the main tower at the main tower cross beam, G i is the gravity of the i-th segment of the main tower, Δ i is the eccentricity of the i-th segment of the main tower, y i is the vertical distance from the centroid of the i-th segment of the main tower to the main tower cross beam, θ0 is the initial lateral outward inclination angle of the main tower, and M A is the first outward lateral bending moment.

[0055] S2: According to the as-built cable forces of the stay cables, the dimensions and angles of the stay cables, determine the second outward lateral bending moment and the inward lateral bending moment generated by the as-built cable forces at the main tower cross beam.

[0056] In some alternative embodiments, according to the as-built cable forces, the dimensions and angles of each stay cable, the outward lateral bending moment generated by each stay cable is obtained.

[0057] The outward lateral bending moments generated by each stay cable are summed to determine the second outward lateral bending moment.

[0058] As Figure 3 and Figure 4 shown, in some alternative embodiments, according to the formula: M Bi = T i ·cos α i ·cosγ i ·l i ·tanθ0, the outward lateral bending moment generated by each stay cable is obtained.

[0059] According to the formula: The second outward lateral bending moment is obtained.

[0060] where \(i = 1\sim n_2\), \(n_2\) is the number of stay cables, \(M\) Bi is the outward lateral moment generated by the \(i\)-th stay cable, \(T\) i is the cable force of the \(i\)-th stay cable, \(\alpha\) i is the longitudinal angle between the \(i\)-th stay cable and the vertical plane, \(\gamma\) i is the lateral angle between the \(i\)-th stay cable and the vertical plane, \(l\) i is the vertical distance from the theoretical anchorage point of the \(i\)-th stay cable to the main tower cross beam, \(M\) B is the second outward lateral moment.

[0061] In some alternative embodiments, the inward lateral moment generated by each stay cable is obtained according to the as-built cable force, the size and angle of the stay cable;

[0062] The inward lateral moments generated by each stay cable are summed to determine the inward lateral moment generated by the as-built cable force at the main tower cross beam.

[0063] As Figure 5 shown, in some alternative embodiments, according to the formula: \(M\) Ci \(=T\) i \(\cdot\cos\alpha\) i \(\cdot\sin\gamma\) i \(\cdot l\) i the inward lateral moment generated by each stay cable is obtained;

[0064] According to the formula: the inward lateral moment generated by the as-built cable force at the main tower cross beam is obtained;

[0065] where \(M\) Ci is the inward lateral moment generated by the \(i\)-th stay cable, \(M\) C is the inward lateral moment generated by the as-built cable force at the main tower cross beam.

[0066] S3: By adjusting the initial lateral inclination angle and the initial cross-section eccentricity of the main tower, making the sum of the first outward lateral moment and the second outward lateral moment satisfy the relationship with the inward lateral moment, the final lateral inclination angle and the final cross-section eccentricity of the main tower are determined.

[0067] In some alternative embodiments, the initial lateral inclination angle and the initial cross-section eccentricity of the main tower are adjusted so that \(M\) A \(+M\) B \(=M\) C , that is: The lateral inclination angle and the cross-section eccentricity of the main tower that satisfy the equation are the final lateral inclination angle and the final cross-section eccentricity of the main tower.

[0068] Figure 6 The schematic diagram of the cross-section eccentricity of the main tower is shown as follows.

[0069] As shown in Figure 2 FIG. [X], on the other hand, the present invention provides a main tower structure, and the design parameters of the main tower structure are determined by the above-mentioned main tower structure design parameter determination method.

[0070] In some alternative embodiments, it includes:

[0071] Two tower columns 1, and the tower columns 1 are respectively inclined outward at a set angle along the transverse bridge direction;

[0072] A main tower cross beam 2, which is connected between the two tower columns 1;

[0073] The cross section of the tower column is a single-cell single-chamber cross section or a single-cell multi-chamber cross section, and the material of the tower column is reinforced concrete or steel structure;

[0074] The cross section of the main tower cross beam is a single-cell single-chamber cross section or a single-cell multi-chamber cross section, and the material of the main tower cross beam is reinforced concrete or steel structure.

[0075] As shown in Figure 2 FIG. [X], the main tower structure further includes: stay cables 3, and a main girder 4.

[0076] In summary, the present invention obtains the first outward transverse bending moment generated by the self-weight of the main tower at the main tower cross beam according to the initial lateral outward inclination angle, the initial cross-section eccentricity, the main tower size and the self-weight of the main tower; determines the second outward transverse bending moment and the inward transverse bending moment generated by the in-service cable force at the main tower cross beam according to the in-service cable force, the stay cable size and the angle of the stay cables; by adjusting the initial lateral outward inclination angle and the initial cross-section eccentricity of the main tower, the sum of the first outward transverse bending moment and the second outward transverse bending moment is made to satisfy the relationship with the inward transverse bending moment, and the final lateral outward inclination angle and the final cross-section eccentricity of the main tower are determined. By adjusting the lateral outward inclination angle and the cross-section eccentricity of the main tower, the transverse bending moment at the main tower cross beam in the in-service state is made zero, so as to determine the lateral outward inclination angle of the main tower and the cross-section eccentricity of the main tower. It solves the problems in the prior art that when designing the cross section, it is necessary to increase the cross section to meet the requirements of cross-section strength and stiffness, and the too large cross section will cause a larger bending moment, resulting in a complex structural design process and a large transverse design bending moment.

[0077] The following provides an example for facilitating the understanding of the solution of the present invention.

[0078] After initially determining the cross-section size of the upper tower column, set the initial lateral outward inclination angle of the main tower, including: ignoring the initial cross-section eccentricity, the self-weight of the main tower is determined according to the average cross-section area, and the self-weight of the main tower G0 = γ G AH = 26×33.7×121 = 105950 kN, where γ G is the unit weight of concrete, A is the average cross-section area of the main tower, and H is the total height of the main tower. Calculate the outward bending moment generated by the initial self-weight: The initial total cable force of the stay cable is T0 = 90032 kN, the average longitudinal angle of the stay cable is α = 50.4°, the average transverse angle is γ = 7.43°, the average vertical distance from the action point of the stay cable to the main tower cross beam is l = 60.5 m. Calculate the initial outward transverse moment at the main tower cross beam generated by the initial total stay cable force: M 02 = T0·cosαcosγ·l·tanθ0, calculate the initial inward transverse moment M at the main tower cross beam generated by the stay cable force 03 = T0·cosα·sinγ·l = 898403 kNm. According to M 01 + M 02 = M 03 The initial lateral outward inclination angle of the main tower is obtained as 3.6276°. Set the initial lateral outward inclination angle of the main tower to 3.6276°, the initial eccentricity of the top section of the upper tower column is 0.3453, and the initial eccentricity of the bottom section of the upper tower column is 0.4753. As Figure 2 shown, the main tower is divided into 35 segments along the height

[0079] According to the formula: M Ai = G i (Δ i + y i tanθ0) and The first outward transverse moment of the self-weight of the main tower at the main tower cross beam is: M A = 2822.5×(0.3452 + 119×tan3.6276) + 1781.8×(0.3489 + 115.8×tan3.6276) + … + 5529.72×(0.3517 + 8.2×tan3.6276) + 9514.7×(0.4753 + 3×tan3.6276) = 411920 kNm

[0080] According to the formula: N Bi = T i ·cosα i ·cosγ i ·l i ·tanθ0 and The second outward transverse moment of the stay cable force at the main tower cross beam is: M B = 2×(8526×cos64.76×cos6.6×117 + 8307×cos64.02×cos6.67×114.5 + … + 4164×cos26×cos8.39×79.5 + 5864×cos16.97×cos8.59×77)×tan 3.6276 = 787597 kNm

[0081] According to the formula: M Ci= T i ·cosα i ·sinγ i ·l i and The inward transverse bending moment at the main tower crossbeam caused by the stay cable force is: M C = 2×(8526×cos64.76×sin6.6×117 + 8307×cos64.02×sin6.67×114.5 + … + 4164×cos26×sin8.39×79.5 + 5864×cos16.97×sin8.59×77) = 1611674 kNm.

[0082] At this time, the M C -M B -M A = 412157 kNm. The transverse bending moment at the main tower crossbeam is not zero. Therefore, adjust the lateral inclination angle of the main tower and the eccentricity of the main tower cross-section to make the transverse bending moment at the main tower crossbeam zero.

[0083] According to the formula: M A +M B = M C , that is: Adjust the lateral inclination angle of the main tower to 4.9132°, the eccentricity of the top cross-section of the upper tower column to 0.3525, and the eccentricity of the bottom cross-section of the upper tower column to 0.4862.

[0084] At this time, M A = 543768.3 kNm, M B = 1067906 kNm, M C = 1611674 kNm, M C -M B -M A = 0.

[0085] Therefore, the design parameters of the main tower are determined as: the lateral inclination angle of the main tower is 4.9132°, the eccentricity of the top cross-section of the upper tower column is 0.3525, and the initial eccentricity of the bottom cross-section of the upper tower column is 0.4862.

[0086] In the description of the present application, it should be noted that the orientation or positional relationship indicated by terms such as "upper" and "lower" is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application. Unless otherwise clearly specified and defined, the terms "installed", "connected", and "coupled" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection, or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0087] It should be noted that in the present application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0088] 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, and 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 rather to the broadest scope consistent with the principles and novel features claimed herein.

Claims

1. A method for determining the design parameters of a main tower structure, characterized in that It includes the following steps: Obtain the first outward lateral moment generated by the self-weight of the main tower at the cross beam of the main tower according to the initial lateral outward inclination angle, initial cross-section eccentricity, main tower dimensions and self-weight of the main tower; Determine the second outward lateral moment and inward lateral moment generated by the completed bridge cable force at the cross beam of the main tower according to the completed bridge cable force, cable size and angle of the stay cables; By adjusting the initial lateral outward inclination angle and initial cross-section eccentricity of the main tower, make the sum of the first outward lateral moment and the second outward lateral moment satisfy the relationship with the inward lateral moment, and determine the final lateral outward inclination angle and final cross-section eccentricity of the main tower.

2. The method for determining the design parameters of the main tower structure according to claim 1, characterized in that The step of obtaining the first outward lateral moment generated by the self-weight of the main tower at the cross beam of the main tower according to the initial lateral outward inclination angle, initial cross-section eccentricity, main tower dimensions and self-weight of the main tower includes: According to the dimensions and self-weights of each section of the main tower, calculate the outward lateral moments generated by the self-weights of each section of the main tower respectively; Sum up the outward lateral moments generated by the self-weights of each section of the main tower to determine the first outward lateral moment.

3. The method for determining the design parameters of the main tower structure according to claim 2, characterized in that, According to the formula: , obtain the outward lateral moment generated by the self-weight of each segment of the main tower at the cross beam of the main tower; According to the formula: , obtain the first outward lateral moment; Among them, , is the number of main tower segments, is the outward lateral bending moment generated by the self-weight of the main tower at the crossbeam of the main tower, is the self-weight of the main tower segment, is the eccentricity of the main tower segment, is the vertical distance from the centroid of the main tower segment to the crossbeam of the main tower, is the initial lateral outward inclination angle of the main tower, is the first outward lateral bending moment.

4. The method for determining the design parameters of the main tower structure according to claim 1, characterized in that The step of determining the second outward lateral moment generated by the completed bridge cable force at the cross beam of the main tower according to the completed bridge cable force, cable size and angle of the stay cables includes: According to the completed bridge cable force, cable size and angle of each stay cable, obtain the outward lateral moment generated by each stay cable; Sum up the outward lateral moments generated by each stay cable to determine the second outward lateral moment.

5. The method for determining the design parameters of the main tower structure according to claim 4, characterized in that According to the formula: , obtain the outward lateral moment generated by each stay cable; According to the formula: , obtain the second outward lateral bending moment; Among them, , is the number of stay cables, is the outward lateral bending moment generated by the stay cable No. is the cable force of the stay cable No. is the longitudinal angle between the stay cable No. and the vertical plane, is the lateral angle between the stay cable No. and the vertical plane, is the vertical distance from the theoretical anchorage point of the stay cable No. to the main tower cross beam, is the second outward lateral bending moment.

6. The method for determining the design parameters of the main tower structure according to claim 1, wherein The step of determining the inward lateral moment generated by the completed bridge cable force at the cross beam of the main tower according to the completed bridge cable force, cable size and angle of the stay cables includes: According to the completed bridge cable force, cable size and angle of each stay cable, obtain the inward lateral moment generated by each stay cable; Sum up the inward lateral moments generated by each stay cable to determine the inward lateral moment generated by the completed bridge cable force at the cross beam of the main tower.

7. The method for determining the design parameters of the main tower structure according to claim 6, characterized in that, According to the formula: , obtain the inward transverse bending moment generated by each stay cable. According to the formula: , obtain the inward transverse bending moment generated by the cable force at the completion of the main tower crossbeam Among them, is the inward lateral bending moment generated by the stay cable No. is the inward lateral bending moment generated by the in-service cable force at the main tower cross beam.

8. The method for determining the design parameters of the main tower structure according to claim 1, characterized in that The step of determining the final lateral outward inclination angle and final cross-section eccentricity of the main tower by adjusting the initial lateral outward inclination angle and initial cross-section eccentricity of the main tower so that the sum of the first outward lateral moment and the second outward lateral moment satisfies the relationship with the inward lateral moment includes: Adjust the initial lateral inclination angle and the initial cross-section eccentricity of the main tower so that , that is: ， The lateral outward inclination angle and cross-section eccentricity of the main tower that satisfy the equation are the final lateral outward inclination angle and final cross-section eccentricity of the main tower.

9. A main tower structure, characterized in that, The design parameters of its main tower structure are determined by the main tower structure design parameter determination method described in any one of claims 1-8; Two-limb tower columns, and the tower columns are respectively inclined outward at a set angle along the transverse direction of the bridge; A main tower cross beam, which is connected between the two-limb tower columns; The cross-section of the tower column is a single-box single-room cross-section or a single-box multi-room cross-section, and the material of the tower column is reinforced concrete or steel structure; The cross-section of the main tower cross beam is a single-box single-room cross-section or a single-box multi-room cross-section, and the material of the main tower cross beam is reinforced concrete or steel structure.

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