Design method and system for stay cable system of cable-stayed bridge and storage medium

Abstract

The invention discloses a cable-stayed bridge inhaul cable system design method and system and a storage medium. Inhaul cable force and inhaul cable anchoring point coordinates are obtained, and cable-stayed lock and matched component model selection is conducted according to the inhaul cable force and the inhaul cable anchoring point coordinates; according to the model selection result, the section size of the inhaul cable is updated, so that the model selection size meets the design safety coefficient requirement; according to the selected specifications of the inhaul cable and the accessories, the updated cable force is combined, the horizontal distance L0 from the bottom point of a part of the catenary to the lowest point of the full catenary is corrected, and the corrected length s of the inhaul cable is calculated according to the corrected L0. The method is suitable for design of a cable-stayed bridge cable system, programmed automation is achieved, the method is reliable in theory and convenient to operate, and the design efficiency and precision of a cable-stayed bridge can be greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge engineering, and in particular to a design method, system and storage medium for a cable-stayed bridge cable system. Background Art

[0002] A cable-stayed bridge is a composite structural system consisting of three basic components: towers, beams, and cables. The role of the cable is equivalent to adding a number of elastic supports within the span of the main beam, thereby greatly reducing the bending moment within the beam and the size of the beam, significantly increasing the span capacity of the bridge, and is often used in large-span bridge structures.

[0003] Due to the existence of cables, cable-stayed bridges are highly statically indeterminate composite structures, which contain many design variables. Adjusting the tension of the cables can significantly adjust the internal forces of the structure, making the structure more economical and reasonable. There is no single standard for adjusting the cable force, and the design process is a process of repeated optimization and adjustment.

[0004] The cable system of a cable-stayed bridge generally includes accessories such as cable stays, anchors, cable guides and anchor blocks. When designing, the cable specifications must first be selected based on the cable force and safety factor. In order to avoid too many types of cable specifications, certain merging is required. Since the cable stays supported at two different elevations are in the shape of a partial catenary under the uniform deadweight load and tension, the accurate geometric parameters of the cable stays need to consider the influence of their sag. Generally, the calculation and correction are performed according to the catenary, and then the size and geometric parameters of the supporting accessories are determined, and finally the relevant structure and parameter charts are given. Since there are as many as hundreds of pairs of cable stays on a cable-stayed bridge, according to the optimization and adjustment of the cable force, the cable model needs to be continuously adjusted to match the cable force, and the corresponding charts need to be continuously updated. There are a lot of chart data in the cable stay system chart. If conventional manual operations are used in the dynamic design process, the efficiency is low and errors are easy to occur; at the same time, the cable stay system is the main load-bearing component of the cable-stayed bridge, the cost accounts for a high proportion, the construction accuracy requirements are high, and the design does not allow errors.

[0005] In view of this, it is necessary to optimize and improve the design method of the cable system of cable-stayed bridges to improve the work efficiency and accuracy of designers. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a cable-stayed bridge cable system design method, system and storage medium to improve the design efficiency and accuracy of the cable-stayed bridge cable system in view of the deficiencies in the prior art.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is: a method for designing a cable system of a cable-stayed bridge, comprising the following steps:

[0008] Obtaining the cable force and the coordinates of the cable anchoring points, and selecting the inclined stay lock and supporting components according to the cable force and the coordinates of the cable anchoring points;

[0009] According to the selection results, update the cable cross-sectional dimensions so that the selected dimensions meet the design safety factor requirements;

[0010] According to the selected cable and accessories specifications, combined with the updated cable force, correct the horizontal distance L0 from the bottom point of the partial catenary to the lowest point of the full catenary: Wherein, c = w / H, L is the horizontal length of the cable, f is the cable sagittal height, w is the deadweight of the cable, sh() is the hyperbolic sine function, and ch() is the hyperbolic cosine function;

[0011] Calculate the corrected cable length s based on the corrected L0:

[0012] The present invention opens up the entire process from calculation and analysis models to design drawings, without the need for manual operation by designers, thus eliminating the problems of input errors or calculation errors that may occur in the traditional design process, and the selection results can be communicated and iterated with the calculation results to meet dynamic design requirements. Therefore, the present invention can not only improve design efficiency but also greatly improve design accuracy.

[0013] In the present invention, the calculation formula of the deadweight w of the cable is: w=Aρ, wherein A is the cross-sectional area of ​​the cable, and ρ is the bulk density of the cable.

[0014] The method of the present invention also includes: using the formula Calculate the vertical positioning parameter y of the cable. Based on the vertical positioning parameter y of the cable, the coordinates of the cable at any point in space can be determined.

[0015] The method of the present invention further comprises: generating a parameter table of the tensioning end and fixed end components of the inclined cable, and a parameter and material quantity table of the inclined cable according to the cable correction length s and the vertical positioning parameter y, and the specific steps are as follows:

[0016] (1) According to the positioning parameters y of each cable point, the angle, length and other parameters of the inclined cable at the beam end and the tower end are determined, thereby generating a parameter table of the tensioned end and fixed end components.

[0017] (2) Based on the cable correction length s and the vertical positioning parameter y, the parameters such as the stress-free length and layout size of the inclined cable are generated, thereby generating a parameter table of the inclined cable.

[0018] (3) Generate a material quantity table based on the cable’s deadweight w and the parameters of the tensioning and fixed ends.

[0019] In the present invention, the safety factor has a value range of 2.8 to 3.5.

[0020] As an inventive concept, the present invention also provides a cable-stayed bridge cable system design system, including a memory, a processor and a computer program stored in the memory; the processor executes the computer program in the memory to implement the steps of the above method.

[0021] As an inventive concept, the present invention also provides a terminal device, including a memory, a processor, and a computer program stored in the memory; the processor executes the computer program in the memory to implement the steps of the above method.

[0022] As an inventive concept, the present invention also provides a computer-readable storage medium having a computer program / instruction stored thereon; the computer program / instruction implements the steps of the above method when executed by a processor.

[0023] Compared with the prior art, the present invention has the following beneficial effects: the present invention is suitable for the design of the cable system of a cable-stayed bridge and realizes programmed automation. The method is theoretically reliable and easy to operate, and can greatly improve the design efficiency and accuracy of the cable-stayed bridge. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Implementation flow chart of the embodiment of the present invention;

[0025] Figure 2 A diagram of a system design interface provided by an embodiment of the present invention;

[0026] Figure 3 This is a diagram of cable selection results provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] Example 1

[0029] Embodiment 1 of the present invention provides a method for designing a cable system of a cable-stayed bridge, comprising the following steps:

[0030] The first step is to input the cable force and cable anchor point coordinates according to the overall design and calculation results, such as Figure 2 shown.

[0031] The second step is to select the cable and supporting components based on the basic data and the cable standard database, such as Figure 3 shown.

[0032] The third step is to feedback the cable selection results to the overall design and calculation, update the cable cross-sectional dimensions through the overall design and calculation, and then review the updated calculation results to confirm whether the selected dimensions can meet the design safety factor requirements. If correct, proceed to the next step.

[0033] Step 4: According to the selected cable and accessories specifications, the accurate cable deadweight w can be obtained:

[0034] w=Aρ

[0035] Where: A is the cross-sectional area of ​​the cable, which can be calculated based on the cross-sectional dimensions of the cable; ρ is the bulk density of the cable, which can be obtained by looking up the product catalogue based on the cable model.

[0036] Combined with the updated cable force, the parameter L0 (the horizontal distance from the bottom point of the partial catenary to the lowest point of the full catenary) is corrected according to the partial catenary formula:

[0037]

[0038] Where: c = w / H;

[0039] L——horizontal length of cable;

[0040] f——cable arrow height.

[0041] According to the deflection curve equation, the corrected length s of the cable and the vertical positioning parameter y are accurately calculated:

[0042]

[0043] The fifth step is to produce parameter charts of supporting facilities such as the mechanical and spatial parameters of the inclined cables, anchors, anchor pipes, etc. based on the corrected accurate parameters.

[0044] The above steps are automated using Matlab software to further improve work efficiency and accuracy.

[0045] The main functions and features of this embodiment are as follows:

[0046] a) Through the research and comparison of cable-related products, a standardized database for cable system design was established. It can be used as a database for automatic selection tools for cable and as a technical manual for reference during work.

[0047] b) Under the premise of meeting the specifications, a reasonable safety factor range (2.8-3.5) is adopted to automatically complete the selection of the inclined cable according to the standard combined cable force. Combined with the concept of intelligent design, this embodiment can automatically merge the types of inclined cables and optimize the cable type layout plan.

[0048] c) Extract the cable force calculation results such as the initial tension, secondary tension and the constant load cable force of the bridge at the beam end and the tower end in the structural analysis software, and automatically generate the standard cable force table of the construction drawing to guide the bridge construction.

[0049] d) Based on the catenary calculation theory, the Matlab language is used to automatically iteratively solve the construction layout space parameters of the inclined cables and related components.

[0050] e) Combined with the standardized design concept, according to the cable selection and spatial parameter correction results, the standard database of the cable is automatically matched, and standardized tables such as the cable tensioning end and fixed end component parameter table, cable parameter and material quantity table are automatically generated. The table is directly imported into the compiled standard drawing of the cable design system to generate the construction drawing.

[0051] The embodiment of the present invention is applicable to the design of the cable system of a cable-stayed bridge and realizes programmed automation. The method is theoretically reliable and easy to operate, and can greatly improve the design efficiency and accuracy of the cable-stayed bridge.

[0052] Example 2

[0053] Embodiment 2 of the present invention provides a design system corresponding to the above-mentioned embodiment 1, including a memory, a processor and a computer program stored in the memory; the processor executes the computer program in the memory to implement the steps of the method in the above-mentioned embodiment 1.

[0054] Example 3

[0055] Embodiment 3 of the present invention provides a terminal device corresponding to the above-mentioned embodiment 1. The terminal device may be a processing device for a client, such as a mobile phone, a laptop computer, a tablet computer, a desktop computer, etc., to execute the method of the above-mentioned embodiment.

[0056] The terminal device of this embodiment includes a memory, a processor, and a computer program stored in the memory; the processor executes the computer program in the memory to implement the steps of the method in the above-mentioned embodiment 1.

[0057] In some implementations, the memory may be a high-speed random access memory (RAM), and may also include a non-volatile memory, such as at least one disk memory.

[0058] In some other implementations, the processor may be a central processing unit (CPU), a digital signal processor (DSP), or other general-purpose processors of various types, which are not limited herein.

[0059] Example 4

[0060] Embodiment 3 of the present invention provides a computer-readable storage medium corresponding to the above embodiment 1, on which a computer program / instruction is stored. When the computer program / instruction is executed by a processor, the steps of the method of the above embodiment 1 are implemented.

[0061] Computer readable storage media can be tangible devices that hold and store instructions used by instruction execution devices. Computer readable storage media can be, for example, but not limited to, electronic storage devices, magnetic storage devices, optical storage devices, electromagnetic storage devices, semiconductor storage devices, or any combination thereof.

[0062] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of complete hardware embodiments, complete software embodiments, or embodiments in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code. The scheme in the embodiments of the present application can be implemented in various computer languages, for example, object-oriented programming language Java and literal scripting language JavaScript, etc.

[0063] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0064] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0065] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0066] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A method for designing a cable system of a cable-stayed bridge, characterized in that: The following steps are involved: Obtaining the cable force and the coordinates of the cable anchoring points, and selecting the inclined stay lock and supporting components according to the cable force and the coordinates of the cable anchoring points; According to the selection results, the cross-sectional dimensions of the cables are updated so that the selected dimensions meet the design safety factor requirements; according to the selected cable and accessory specifications and the updated cable force, the horizontal distance L0 from the bottom point of the partial catenary to the lowest point of the full catenary is corrected: Wherein, c = w / H, L is the horizontal length of the cable, f is the cable sagittal height, w is the deadweight of the cable, sh() is the hyperbolic sine function, and ch() is the hyperbolic cosine function; Calculate the corrected cable length s based on the corrected L0:

2. The cable-stayed bridge cable system design method according to claim 1, characterized in that: The calculation formula for the deadweight w of the cable is: w=Aρ, where A is the cross-sectional area of ​​the cable and ρ is the bulk density of the cable.

3. The cable-stayed bridge cable system design method according to claim 1, characterized in that: Also includes: Using formula Calculate the vertical positioning parameter y of the cable.

4. The cable-stayed bridge cable system design method according to claim 3, characterized in that: Also includes: According to the cable correction length s and the vertical positioning parameter y, the parameter table of the tensioning end and fixed end components of the inclined cable, as well as the parameter and material quantity table of the inclined cable are generated.

5. The method for designing a cable system for a cable-stayed bridge according to any one of claims 1 to 4, characterized in that: The safety factor has a value range of 2.8 to 3.

5.

6. A cable-stayed bridge cable system design system, comprising a memory, a processor, and a computer program stored in the memory; characterized in that: The processor executes the computer program in the memory to implement the steps of the method according to any one of claims 1 to 5.

7. A terminal device comprising a memory, a processor and a computer program stored in the memory; characterized in that: The processor executes the computer program in the memory to implement the steps of the method according to any one of claims 1 to 5.

8. A computer-readable storage medium having a computer program / instruction stored thereon; characterized in that: When the computer program / instructions are executed by a processor, the steps of the method according to any one of claims 1 to 5 are implemented.

Images