Purline deepening design optimization method and steel structure system

Abstract

The invention belongs to the field of steel structure factory building deepening design, particularly relates to a purline deepening design optimization method and a steel structure system, and aims to solve the problems of field installation difficulty and construction progress reduction. The method comprises the steps that the distance value between an angle brace connecting hole in a purline and the end of the purline is determined, and the distance value is calculated based on the heights of the sections of the two ends of a variable-section H-shaped component; calculating an included angle between the angle brace and the purline based on the distance value, and calculating the maximum axial force needing to be borne by the angle brace under the included angle; carrying out checking calculation on the bearing capacity of the angle brace and the connecting bolt thereof; if the checking calculation result meets the design requirement, the distance value is adopted as an optimization result; if not, the distance value is adjusted, and the checking calculation step is repeated until the design requirement is met. The method is simple, purline specifications can be obviously reduced, deepening design and manufacturing time is saved, field installation difficulty is lowered, reworking is avoided, the construction progress is accelerated, and engineering cost is saved.

Description

Technical Field

[0001] This invention belongs to the field of steel structure workshop detailed design, specifically involving a purlin detailed design optimization method and a steel structure system. Background Technology

[0002] Currently, lightweight steel structure factory buildings are increasingly widely used in industrial construction, with beams and columns often being variable cross-section H-shaped members. During the design phase, to reduce the out-of-plane calculated length of the members and improve their stability, corner braces are often installed between beams, columns, and purlins, with the angle between the corner braces and purlins typically controlled at around 45°. The distance between the corner brace connection holes and the purlin ends varies in different locations. This difference in hole position increases the required purlin specifications, raises the difficulty of on-site installation, and slows down the construction progress.

[0003] Based on this, the present invention proposes a purlin detailed design optimization method and a steel structure system. Summary of the Invention

[0004] To address the aforementioned problems in existing technologies, namely, the difficulty of on-site installation and the reduced construction progress, this invention provides a purlin detailed design optimization method and a steel structure system.

[0005] In a first aspect, the present invention provides a method for optimizing the detailed design of purlins, the method comprising:

[0006] The distance between the upper corner brace connection hole of the purlin and the end of the purlin is determined, and the distance is calculated based on the height of the two ends of the cross section of the variable cross section H-shaped member;

[0007] Calculate the angle between the corner brace and the purlin based on the distance value, and calculate the maximum axial force that the corner brace needs to withstand at the angle.

[0008] The load-bearing capacity of the corner brace and its connecting bolts is verified.

[0009] If the verification result meets the design requirements, the distance value is used as the optimization result; if it does not meet the requirements, the distance value is adjusted and the verification steps are repeated until the design requirements are met.

[0010] Furthermore, the distance value is calculated based on the heights of the two ends of the variable cross-section H-shaped member, using the following method:

[0011] Take the average value of the cross-sectional heights at both ends of the variable cross-section H-shaped member, and round the average value to an integer multiple of a preset value.

[0012] Furthermore, when the purlins are designed as continuous beams, the distance value should not be less than 5% of the purlin length.

[0013] Furthermore, the included angle is calculated as follows:

[0014]

[0015] Where h is the cross-sectional height of the variable cross-section H-shaped member at the calculation point, h1 and h2 are the cross-sectional heights at both ends of the variable cross-section H-shaped member, and H is the cross-sectional height of the purlin.

[0016] Furthermore, the maximum axial force N is calculated as follows:

[0017] N = k × A × f;

[0018] Where k is a coefficient related to the included angle θ, A is the cross-sectional area of ​​the lower flange of the variable cross-section H-shaped member, and f is the design value of the compressive strength of the supported flange.

[0019] Furthermore, k increases as the included angle θ increases.

[0020] Furthermore, the bearing capacity of the corner brace is verified using the following method:

[0021]

[0022] Where A is the cross-sectional area of ​​the lower flange of the variable cross-section H-shaped member, A0 is the cross-sectional area of ​​the variable cross-section H-shaped member, and φ is the preset overall stability coefficient.

[0023] Furthermore, the bearing capacity of the bolts connecting the corner brace and the purlin is verified using the following method:

[0024] 0.0333Af < 470td;

[0025] Where d is the bolt diameter and t is the purlin thickness.

[0026] In a second aspect, the present invention proposes a steel structure system based on a purlin detailed design optimization method, the system comprising:

[0027] Variable cross-section H-shaped member;

[0028] Multiple purlins are arranged on the variable cross-section H-shaped member;

[0029] Multiple corner braces are connected between the variable cross-section H-shaped member and the purlin;

[0030] Multiple connecting bolts are used to secure the corner brace to the purlin;

[0031] The distance between the corner brace connection hole on the purlin and the end of the purlin is uniformly set by the optimization method.

[0032] Furthermore, the corner brace is made of equilateral angle steel, and the connecting bolt is a bearing bolt.

[0033] The beneficial effects of this invention are:

[0034] It effectively overcomes the problems of increased purlin specifications, complex on-site installation, and low construction efficiency caused by differences in the position of corner brace connection holes. Through unified distance setting and systematic load-bearing capacity calculation, it significantly reduces the difficulty of detailed design and on-site construction, avoids rework and adjustments during installation, and helps to speed up the overall project progress and save comprehensive construction costs. Attached Figure Description

[0035] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0036] Figure 1 This is a flowchart illustrating the first embodiment of the present invention;

[0037] Figure 2 This is a schematic diagram of the overall structure of the steel structure system according to the second embodiment of the present invention;

[0038] Figure 3 These are schematic diagrams of the planar structures of steel beams, purlins, and corner braces in various embodiments of the present invention;

[0039] Figure 4 These are schematic diagrams of the variable cross-section H-shaped component in several embodiments of the present invention;

[0040] Figure 5 This is a schematic diagram of the structure of a computer system used to implement the methods, systems, and devices of this application. Detailed Implementation

[0041] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0042] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0043] The first embodiment of the present invention provides a method for optimizing the detailed design of purlins, the method comprising:

[0044] Step S1: Determine the distance between the connecting hole of the upper corner brace 3 of the purlin 2 and the end of the purlin 2. The distance is calculated based on the height of the two ends of the cross-section of the variable cross-section H-shaped member 1.

[0045] Step S2: Calculate the angle between the corner brace 3 and the purlin 2 based on the distance value, and calculate the maximum axial force that the corner brace 3 needs to withstand under the angle.

[0046] Step S3: Verify the load-bearing capacity of the corner brace 3 and its connecting bolts 4;

[0047] Step S4: If the verification result meets the design requirements, the distance value is used as the optimization result; if it does not meet the requirements, the distance value is adjusted and the verification steps are repeated until the design requirements are met.

[0048] To more clearly illustrate the purlin detailing design optimization method of the present invention, the following is combined with... Figure 1 The steps in the embodiments of the present invention are described in detail below:

[0049] Step S1: Determine the distance between the connecting hole of the upper corner brace 3 of the purlin 2 and the end of the purlin 2. The distance is calculated based on the height of the two ends of the cross-section of the variable cross-section H-shaped member 1.

[0050] In this embodiment, the distance value is calculated based on the heights of the two ends of the variable cross-section H-shaped member 1, and the method is as follows:

[0051] Take the average value of the cross-sectional heights at both ends of the variable cross-section H-shaped member 1, and round the average value to an integer multiple of a preset value.

[0052] The specific calculation method in this embodiment is to take the average value of the cross-sectional heights at both ends of the variable cross-section H-shaped member 1, and round this average value to a multiple of 50. This is to standardize the dimensions in actual engineering, reduce the variety of purlin 2 specifications, improve the standardization of components, and reduce the difficulty of processing and installation. For example, if the cross-sectional heights at both ends of a variable cross-section H-beam are 900mm and 450mm respectively, then its average value is 675mm. After rounding to a multiple of 50, 650mm can be used as a uniform hole spacing value, thereby achieving a standardized arrangement of purlin 2 holes.

[0053] The distance value shall not be less than 5% of the length of purlin 2.

[0054] In this embodiment, the rounding principle is generally a multiple of 50mm, but the specific value needs to be determined comprehensively based on the actual engineering situation. For example, when the calculated average value is 675mm, it may be rounded to 650mm or 700mm. This specific choice is determined by those skilled in the art based on various factors such as on-site construction conditions, material specifications, stress characteristics, and compatibility with other components, in order to ultimately meet the overall requirements of structural safety, construction convenience, and economy. This invention provides a general optimization method and value selection principle, without imposing mandatory restrictions on the rounding direction (up or down), aiming to provide a flexible and reliable optimization design basis for engineering design.

[0055] In this embodiment, when determining the distance between the connecting hole of the corner brace 3 and the end of the purlin 2, in addition to rounding the average height of the cross-sections at both ends of the variable cross-section H-shaped member 1 to an integer multiple of 50, special attention must be paid to ensuring that this distance is not less than 5% of the length of the purlin 2 itself. This requirement is mainly to ensure that when the purlin 2 is designed as a continuous beam, the hole positions have sufficient end distance to ensure the effectiveness of the connection and the overall stability of the component, and to avoid local stress concentration or decreased connection performance that may be caused by the hole positions being too close to the end. For example, for a purlin 2 with a length of 8 meters, 5% is 0.4 meters, or 400 millimeters. Therefore, the final determined uniform hole spacing d value must not only meet the requirement of rounding the average height but also be no less than 400 millimeters to be implemented.

[0056] Step S2: Calculate the angle between the corner brace 3 and the purlin 2 based on the distance value, and calculate the maximum axial force that the corner brace 3 needs to withstand under the angle.

[0057] The included angle is calculated as follows:

[0058]

[0059] Where h is the cross-sectional height of the variable cross-section H-shaped member 1 at the calculation point, h1 and h2 are the cross-sectional heights at both ends of the variable cross-section H-shaped member 1, and H is the cross-sectional height of the purlin.

[0060] The value of H ranges from 220mm to 280mm. (220-280) / 2 represents the center value offset adjustment for the commonly used purlin 2 section height range of 220mm to 280mm in engineering. Typically, the heights at both ends of the variable cross-section H-shaped member 1 have an approximate multiple relationship, i.e., h2≈2h1, where d≈1.5h1. During calculation, the most unfavorable position should be selected for verification, usually at h2 where the section height is largest, as the included angle θ is largest, and the corresponding axial force of the corner brace 3 is also largest. For example, in a specific working condition, h2 is 900mm, h1 is 450mm, d is 650mm, and the purlin 2 section height is 280mm. Substituting these values ​​into the formula yields the tanθ value, and thus the included angle θ.

[0061] The maximum axial force N is calculated as follows:

[0062] N = k × A × f;

[0063] Where k is a coefficient related to the included angle θ, A is the cross-sectional area of ​​the lower flange of the variable cross-section H-shaped member 1, and f is the design value of the compressive strength of the supported flange.

[0064] Specifically, the formula for calculating axial force N is: N = Af / 60cosθ

[0065] A - Cross-sectional area of ​​the lower flange of the variable cross-section beam; f - Design value of compressive strength of the supported flange

[0066] Based on the actual engineering situation, the included angle θ can be determined to be between 40-60°, and the formula for calculating the axial force N can be further simplified to:

[0067] N = k·Af, k = (0.0218 - 0.0333)

[0068] In this embodiment, k is the axial force coefficient related to the included angle θ, and its value ranges from 0.0218 to 0.0333. It is positively correlated with the value of θ, that is, the value of k increases as the included angle θ increases; A is the cross-sectional area of ​​the lower flange of the connected variable cross-section H-beam; f is the design value of the compressive strength of the steel in the lower flange. During calculation, the most unfavorable working condition should be selected, that is, the maximum included angle θ is usually located at the maximum cross-sectional height h2 of the member to determine the maximum value of k, and then calculate the maximum axial force N. For example, when θ is 58°, k can be taken as 0.0333, and if the area A of the lower flange of the beam is 2880 mm²... 2 The design value of the compressive strength f of the steel is 305 N / mm². 2 The calculated maximum axial force N is 29.25 kN. This force will be used for the subsequent load-bearing capacity verification of the corner brace 3 and its connecting bolt 4.

[0069] Step S3: Verify the load-bearing capacity of the corner brace 3 and its connecting bolts 4;

[0070] The bearing capacity of corner brace 3 is verified by the following method:

[0071]

[0072] Where A is the cross-sectional area of ​​the lower flange of the variable cross-section H-shaped member 1, A0 is the cross-sectional area of ​​the variable cross-section H-shaped member 1, and φ is the preset overall stability coefficient.

[0073] The bearing capacity of the bolt 4 connecting the corner brace 3 and the purlin 2 is verified by the following method:

[0074] 0.0333Af < 470td;

[0075] Where d is the bolt diameter and t is the purlin thickness.

[0076] In this embodiment, after calculating the maximum axial force N of the corner brace 3, it is necessary to verify the bearing capacity of the corner brace 3 itself and the bolts connecting it to the purlin 2. The formula for verifying the bearing capacity of the corner brace 3 is as follows:

[0077] Where A is the cross-sectional area of ​​the lower flange of the variable cross-section H-beam, and A0 is the overall cross-sectional area of ​​the variable cross-section H-beam. The overall stability coefficient of the component is obtained from the "Steel Structure Design Standard," and its value is usually no greater than 0.85. This verification aims to ensure that the supporting force provided by the corner brace 3 matches the overall stability of the beam component. Subsequently, the shear bearing capacity of the connecting bolt 4 needs to be verified, and the formula is: 0.0333Af<470td.

[0078] Where d is the diameter of the selected bolt, t is the thickness of purlin 2, and 470 is a calculation coefficient determined based on the performance of ordinary high-strength bolts. This verification must ensure that the shear force generated in the bolt by the maximum axial force N is less than the shear bearing capacity of the bolt itself. Both of the above verifications must satisfy the inequality conditions. If either one is not satisfied, the hole spacing d value must be adjusted and recalculated until all bearing capacity requirements are met.

[0079] Step S4: If the verification result meets the design requirements, the distance value is used as the optimization result; if it does not meet the requirements, the distance value is adjusted and the verification steps are repeated until the design requirements are met.

[0080] After completing the load-bearing capacity verification of corner brace 3 and its connecting bolts 4, if the verification results all meet the design requirements, that is, the stability verification inequality of corner brace 3 is valid and the shear bearing capacity of the bolts is sufficient, it indicates that the currently determined uniform hole spacing d value, such as 650mm, is safe and feasible. This d value can be used as the final optimization result, and the standardized detailed design and mass production of purlin 2 can be carried out accordingly. If any verification result does not meet the requirements, the distance value d needs to be adjusted, usually by increasing or decreasing it in 50mm increments. Then, steps S2 and S3 are repeated to recalculate the included angle θ and maximum axial force N corresponding to the adjusted d value, and the load-bearing capacity verification of corner brace 3 and bolts is performed again. This iterative process is repeated until a d value that meets all load-bearing capacity requirements and conforms to the standardized module and the requirement that the end distance is not less than 5% of the length of purlin 2 is found, thus finally determining the optimal purlin 2 hole spacing arrangement scheme.

[0081] Please see Figure 1-3 A method for optimizing the detailed design of purlins is presented in a specific project. The cross-sectional dimensions of the variable cross-section H-shaped member 11 are 900-450x240x8x12, i.e., h1 = 450mm, h2 = 900mm. Purlin 22 is made of C280x70x20x2.5 steel, corner brace 33 is made of L50x5 equilateral angle steel, and connecting bolt 44 consists of two M16 high-strength bearing bolts.

[0082] Based on S1 above, we can determine that d = 900 + 450 / 2 = 675 mm. Since we take d as an integer multiple of 50, we choose 650 mm.

[0083] The included angle θ mentioned in S2 is most unfavorable at the end h2 of the variable cross-section H-shaped member 11, at which point:

[0084]

[0085] At this point, the included angle θ = 58°, which is close to the maximum value of 60° in the simplified formula. The axial force N can be calculated according to the simplified formula: N = 0.0333 x 2880 x 305 = 29.25 kN.

[0086] In S3, the cross-sectional area A of the lower flange of the variable cross-section H-shaped member 11 is 2880 mm². 2 The axial force corner brace 33 has a length L = 1226.4 mm, and the cross-sectional area of ​​the variable cross-section H-shaped member 11 is A0 = 12768 mm². 2 According to the "Steel Structure Design Standard", the following information can be found.

[0087]

[0088] The requirements are met. The bearing capacity verification results for corner brace 3 are as follows:

[0089]

[0090] The requirements are met.

[0091] The calculation results of the bearing capacity of the corner brace 3 and connecting bolt 4 are as follows:

[0092] 0.0333 × 2880 × 305 = 29250 < 2 × 470 × 2.5 × 16 = 37600

[0093] The requirements are met.

[0094] The purlin 2 was optimized according to the above optimization method, and the bearing capacity met the requirements, achieving the expected effect. The optimization method is feasible.

[0095] Although the steps in the above embodiments are described in the above order, those skilled in the art will understand that in order to achieve the effect of this embodiment, different steps do not need to be executed in such an order. They can be executed simultaneously (in parallel) or in a reverse order. These simple variations are all within the protection scope of this invention.

[0096] like Figures 2-4 As shown, a steel structure system according to a second embodiment of the present invention is optimized based on a purlin detailed design optimization method. The system includes:

[0097] Variable cross-section H-shaped member 1;

[0098] Multiple purlins 2 are arranged on the variable cross-section H-shaped member 1;

[0099] Multiple corner braces 3 are connected between the variable cross-section H-shaped member 1 and the purlin 2;

[0100] Multiple connecting bolts 4 are used to fix the corner brace 3 to the purlin 2;

[0101] The distance between the connecting hole of the corner brace 3 on the purlin 2 and the end of the purlin 2 is uniformly set by the optimization method.

[0102] The distance from the end of the holes on all purlins 2 used to connect to the corner braces 3 is uniformly set to a standard value, such as 650mm, using the aforementioned optimization method. Through this optimization, the system successfully standardizes the connection holes of purlins 2, significantly reduces the variety of purlin 2 specifications, simplifies the detailed design and component processing flow, and greatly reduces the difficulty of on-site identification and installation. Thus, while ensuring structural safety, it effectively improves construction efficiency and saves project costs.

[0103] As a further explanation of the present invention, the corner brace 3 is made of equilateral angle steel, and the connecting bolt 4 is a bearing bolt.

[0104] In the steel structure system guided by this optimization method, the corner brace 3 is made of equilateral angle steel, such as the commonly used L50x5 specification in engineering. This profile has the advantages of uniform specifications, ease of procurement, stable compressive strength, and ease of cutting and connection construction. Meanwhile, the connecting bolts 4 are explicitly chosen as bearing-type bolts, such as M16 high-strength bearing-type bolts. This type of bolt uses the bearing pressure between the bolt and the hole wall to transmit shear force, featuring high connection stiffness, small deformation, and high bearing capacity. It can reliably transmit the axial pressure borne by the corner brace 3, and its performance should meet the requirements of relevant specifications such as the "Steel Structure Design Standard". The selection of these two materials, combined with the aforementioned optimization design method, jointly ensures the safety and reliability of the corner brace 3 connection node during actual stress processes, and is an important foundation for achieving standardized design, efficient construction, and structural performance assurance.

[0105] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working process and related descriptions of the system described above can be found in the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0106] It should be noted that the steel structure system provided in the above embodiments is only an example of the division of the above functional modules. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the modules or steps in the embodiments of the present invention can be further decomposed or combined. For example, the modules in the above embodiments can be merged into one module, or further divided into multiple sub-modules to complete all or part of the functions described above. The names of the modules and steps involved in the embodiments of the present invention are only for distinguishing the various modules or steps and are not considered as an improper limitation of the present invention.

[0107] An electronic device according to a third embodiment of the present invention includes:

[0108] At least one processor; and

[0109] A memory communicatively connected to at least one of the processors; wherein,

[0110] The memory stores instructions that can be executed by the processor to implement the aforementioned purlin detailing design optimization method.

[0111] A fourth embodiment of the present invention provides a computer-readable storage medium storing computer instructions, which are executed by the computer to implement the above-described purlin detailing design optimization method.

[0112] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working process and related descriptions of the storage device and processing device described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0113] Those skilled in the art will recognize that the modules and method steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. The programs corresponding to the software modules and method steps can be placed in random access memory (RAM), main memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disks, removable disks, CD-ROMs, or any other form of storage medium known in the art. To clearly illustrate the interchangeability of electronic hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in electronic hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the invention.

[0114] The following is for reference. Figure 5 It shows a schematic diagram of the structure of a computer system for implementing the methods, systems, and devices of this application. Figure 5 The server shown is merely an example and should not impose any limitations on the functionality and scope of use of the embodiments of this application.

[0115] like Figure 5As shown, the computer system includes a Central Processing Unit (CPU) 501, which can perform various appropriate actions and processes based on programs stored in Read Only Memory (ROM) 502 or programs loaded from storage section 508 into Random Access Memory (RAM) 503. The RAM 503 also stores various programs and data required for system operation. The CPU 501, ROM 502, and RAM 503 are interconnected via a bus 504. An Input / Output (I / O) interface 505 is also connected to the bus 504.

[0116] The following components are connected to I / O interface 505: an input section 506 including a keyboard, mouse, etc.; an output section 507 including a cathode ray tube (CRT), liquid crystal display (LCD), etc., and speakers, etc.; a storage section 508 including a hard disk, etc.; and a communication section 509 including a network interface card such as a LAN (Local Area Network) card, modem, etc. The communication section 509 performs communication processing via a network such as the Internet. A drive 510 is also connected to I / O interface 505 as needed. Removable media 511, such as a disk, optical disk, magneto-optical disk, semiconductor memory, etc., are installed on drive 510 as needed so that computer programs read from them can be installed into storage section 508 as needed.

[0117] Specifically, according to embodiments of this disclosure, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments of this disclosure include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via communication section 509, and / or installed from removable medium 511. When the computer program is executed by central processing unit (CPU) 501, it performs the functions defined in the methods of this application. It should be noted that the computer-readable medium described above in this application can be a computer-readable signal medium or a computer-readable storage medium, or any combination of the two. A computer-readable storage medium can be, for example,—but not limited to—an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of computer-readable storage media may include, but are not limited to: electrical connections having one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. In this application, a computer-readable storage medium can be any tangible medium containing or storing a program that can be used by or in connection with an instruction execution system, apparatus, or device. In this application, a computer-readable signal medium may include a data signal propagated in baseband or as part of a carrier wave, carrying computer-readable program code. Such propagated data signals can take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. A computer-readable signal medium can also be any computer-readable medium other than a computer-readable storage medium, which can send, propagate, or transmit a program for use by or in connection with an instruction execution system, apparatus, or device. The program code contained on a computer-readable medium can be transmitted using any suitable medium, including but not limited to: wireless, wire, optical fiber, RF, etc., or any suitable combination thereof.

[0118] Computer program code for performing the operations of this application can be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, and C++, and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0119] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0120] The terms “first”, “second”, etc., are used to distinguish similar objects, not to describe or indicate a specific order or sequence.

[0121] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus / device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent in such process, method, article, or apparatus / device.

[0122] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A method for optimizing the detailed design of purlins, characterized in that, The method includes: Determine the distance between the connecting hole of the upper corner brace (3) of the purlin (2) and the end of the purlin (2), the distance value being calculated based on the height of the two ends of the cross section of the variable cross section H-shaped member (1); Calculate the angle between the corner brace (3) and the purlin (2) based on the distance value, and calculate the maximum axial force that the corner brace (3) needs to bear under the angle. The bearing capacity of the corner brace (3) and its connecting bolts (4) is verified; If the verification result meets the design requirements, the distance value is used as the optimization result; if it does not meet the requirements, the distance value is adjusted and the verification steps are repeated until the design requirements are met.

2. The purlin detailed design optimization method according to claim 1, characterized in that, The distance value is calculated based on the height of the two ends of the variable cross-section H-shaped member (1), and the method is as follows: Take the average value of the cross-sectional heights at both ends of the variable cross-section H-shaped member (1), and round the average value to an integer multiple of a preset value.

3. The purlin detailed design optimization method according to claim 1, characterized in that, When the purlin (2) is designed as a continuous beam, the distance value shall not be less than 5% of the length of the purlin (2).

4. The purlin detailed design optimization method according to claim 1, characterized in that, The included angle is calculated as follows: Where h is the cross-sectional height of the variable cross-section H-shaped member (1) at the calculation point, h1 and h2 are the cross-sectional heights at both ends of the variable cross-section H-shaped member (1) respectively, and H is the cross-sectional height of the purlin.

5. The purlin detailed design optimization method according to claim 1, characterized in that, The maximum axial force N is calculated as follows: N = k × A × f; Where k is a coefficient related to the included angle θ, A is the cross-sectional area of ​​the lower flange of the variable cross-section H-shaped member (1), and f is the design value of the compressive strength of the supported flange.

6. The purlin detailed design optimization method according to claim 5, characterized in that, The value of k increases as the included angle θ increases.

7. The purlin detailed design optimization method according to claim 5, characterized in that, The bearing capacity of the corner brace (3) is verified by the following method: Where A is the cross-sectional area of ​​the lower flange of the variable cross-section H-shaped member (1), A0 is the cross-sectional area of ​​the variable cross-section H-shaped member (1), and φ is the preset overall stability coefficient.

8. The purlin detailed design optimization method according to claim 7, characterized in that, The bearing capacity of the bolts (4) connecting the corner brace (3) and the purlin (2) is verified by the following method: 0.0333Af < 470td; Where d is the bolt diameter and t is the purlin (2) thickness.

9. A steel structure system, optimized based on the purlin detailed design optimization method according to any one of claims 1-8, characterized in that, The system includes: Variable cross-section H-shaped member (1); Multiple purlins (2) are arranged on the variable cross-section H-shaped member (1); Multiple corner braces (3) are connected between the variable cross-section H-shaped member (1) and the purlin (2); Multiple connecting bolts (4) are used to fix the corner brace (3) to the purlin (2); The distance between the connecting hole of the corner brace (3) on the purlin (2) and the end of the purlin (2) is uniformly set by the optimization method.

10. A steel structure system according to claim 9, characterized in that, The corner brace (3) is made of equilateral angle steel, and the connecting bolt (4) is a bearing bolt.

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