A method and device for determining specifications of T-angle steel axial compression members

Abstract

The invention provides a method and device for determining the specifications of a T-angle steel axial compression component, wherein the T-angle steel axial compression component comprises a single-leg fire-curved equilateral angle steel and a straight equilateral angle steel connected by bolts; the fire-curved section length of the T-angle steel axial compression component is obtained; the cross-sectional area of ​​the T-angle steel axial compression component is determined based on the fire-curved section length and the slenderness ratio of the T-angle steel axial compression component; the specifications of the T-angle steel axial compression component are determined based on the cross-sectional area, and the cross-sectional area of ​​the T-angle steel axial compression component is determined only by the fire-curved section length and the slenderness ratio, which not only improves the calculation accuracy, but also accurately and efficiently obtains the specifications of the T-angle steel axial compression component; the process uses only a few parameters, which improves the calculation accuracy; a theoretical basis is provided for the application of the T-angle steel axial compression component composed of the single-leg fire-curved equilateral angle steel in the inclined material of a transmission tower, and fills the gap in the current relevant design specifications for the selection of specifications of the T-angle steel axial compression component composed of the single-leg fire-curved equilateral angle steel.

Description

Technical Field

[0001] The invention relates to the technical field of power transmission networks, and in particular to a method and a device for determining specifications of a T-angle steel axial compression member. Background Art

[0002] The cross section of the equilateral double-jointed T-angle steel belongs to the uniaxial symmetrical cross section. For the uniaxial symmetrical cross section axial compression member, bending buckling around the asymmetric axis may occur, and bending-torsion buckling may also occur. For the double-angle steel member with this cross section, there is a clear calculation formula for its cross-sectional area, and the specifications of the T-angle steel axial compression member are selected based on the cross-sectional area. As for the T-angle steel axial compression member including the single-leg fire-curved equilateral angle steel, as a new type of double-angle steel member, it is used in the inclined material of the transmission tower with a slenderness ratio greater than 60. Its stiffness changes along the length of the member. Under the action of axial compressive load, the T-angle steel axial compression member is in an axial compression state except for the end, and the rest is subjected to eccentric compression load, and the member is subjected to bending instability around the symmetry axis. In the prior art "Technical Regulations for Structural Design of Overhead Transmission Line Towers" (DL / T 5154-2012), only equilateral single angle steels are considered for the calculation length of the tower diagonal materials, including T-angle steel axial compression members of single-leg fire-curved equilateral angle steels as tower diagonals. Since the formula for determining the cross-sectional area of ​​double-piece T-angle steel axial compression members composed of straight equilateral angle steels in the prior art is not applicable to the determination of the cross-sectional area of ​​T-angle steel axial compression members including single-leg fire-curved equilateral angle steels, the method for determining the specifications of double-piece T-angle steel axial compression members composed of straight equilateral angle steels has great limitations. Summary of the invention

[0003] In order to overcome the limitations of the above-mentioned prior art, the present invention provides a method and device for determining the specifications of a T-angle steel axial compression member, wherein the T-angle steel axial compression member includes a single-leg fire-bend equilateral angle steel and a straight equilateral angle steel connected by bolts; the fire-bend section length of the T-angle steel axial compression member is obtained; the cross-sectional area of ​​the T-angle steel axial compression member is determined based on the fire-bend section length and the slenderness ratio of the T-angle steel axial compression member; the specifications of the T-angle steel axial compression member are determined based on the cross-sectional area, and the cross-sectional area of ​​the T-angle steel axial compression member is determined only by the fire-bend section length and the slenderness ratio, which not only improves the calculation accuracy, but also accurately and efficiently obtains the specifications of the T-angle steel axial compression member.

[0004] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical scheme:

[0005] In one aspect, the present invention provides a method for determining the specifications of a T-angle steel axial compression member, wherein the T-angle steel axial compression member comprises a single-leg fire-curved equilateral angle steel and a straight equilateral angle steel connected by bolts; the method comprises:

[0006] Get the length of the fire curved section of the T-angle steel axial compression member;

[0007] Determine the cross-sectional area of ​​the T-angle steel axial compression member based on the length of the fire curve section and the slenderness ratio of the T-angle steel axial compression member;

[0008] The specifications of the T-angle steel axial compression member are determined based on the cross-sectional area.

[0009] The determining of the cross-sectional area of ​​the T-angle steel axial compression component based on the fire curved section length and the slenderness ratio of the T-angle steel axial compression component comprises:

[0010] The bearing capacity reduction factor of the T-angle steel member is calculated based on the fire curve length and slenderness ratio of the T-angle steel axial compression member;

[0011] Based on the stability coefficient of the single-leg fire-bent equal-leg angle steel and the stability coefficient of the straight equal-leg angle steel, the stability coefficient of the T-angle steel member under axial compression is determined, and then the cross-sectional area of ​​the T-angle steel member is obtained;

[0012] Wherein, the slenderness ratio is determined based on the calculated length of the T-angle steel axial compression member.

[0013] The bearing capacity reduction factor of the T-angle steel axial compression member is determined by the following formula:

[0014]

[0015] Where n is the bearing capacity reduction factor of the T-angle steel axial compression member; d is the length of the fire bend section of the T-angle steel axial compression member; λ is the slenderness ratio of the T-angle steel axial compression member.

[0016] The stability coefficient of the T-shaped angle steel member under axial compression is determined based on the stability coefficient of the single-leg fire-bent equilateral angle steel and the stability coefficient of the straight equilateral angle steel, including:

[0017] The smaller of the stability coefficient of the single-leg curved equilateral angle steel and the stability coefficient of the straight equilateral angle steel is selected as the stability coefficient of the T-angle steel axial compression member when it is axially compressed.

[0018] The cross-sectional area of ​​the T-angle steel axial compression member is determined by the following formula:

[0019]

[0020] In the formula, A is the cross-sectional area of ​​the T-angle steel axial compression member, N is the bearing capacity of the T-angle steel axial compression member, and f is the yield strength of the steel used in the T-angle steel axial compression member. It is the stability coefficient of the T-angle steel axial compression member when it is subjected to axial compression.

[0021] The determining of the specifications of the T-angle steel axial compression member based on the cross-sectional area includes:

[0022] Based on the cross-sectional area, the specification of the T-angle steel axial compression member is determined by querying the combined section property table.

[0023] On the other hand, the present invention further provides a device for determining the specifications of a T-angle steel axial compression member, wherein the T-angle steel axial compression member comprises a single-leg fire-curved equal-leg angle steel and a straight equal-leg angle steel connected by bolts; the device comprises:

[0024] An acquisition module is used to obtain the length of the fire curved section of the T-angle steel axial compression member;

[0025] A first determination module is used to determine the cross-sectional area of ​​the T-angle steel axial compression component based on the fire curved section length and the slenderness ratio of the T-angle steel axial compression component;

[0026] The second determination module is used to determine the specifications of the T-angle steel axial compression member based on the cross-sectional area.

[0027] The first determining module comprises:

[0028] The first determination unit is used to calculate the bearing capacity reduction factor of the T-angle steel member based on the fire curved section length and slenderness ratio of the T-angle steel axial compression member;

[0029] The second determination unit is used to determine the stability coefficient of the T-shaped angle steel member when it is axially compressed based on the stability coefficient of the single-leg fire-curved equal-leg angle steel and the stability coefficient of the straight equal-leg angle steel, and then obtain the cross-sectional area of ​​the T-shaped angle steel member;

[0030] Wherein, the slenderness ratio is determined based on the calculated length of the T-angle steel axial compression member.

[0031] The first determination unit determines the bearing capacity reduction factor of the T-angle steel axial compression member according to the following formula:

[0032]

[0033] Where n is the bearing capacity reduction factor of the T-angle steel axial compression member, d is the length of the fire bend section of the T-angle steel axial compression member; λ is the slenderness ratio of the T-angle steel axial compression member.

[0034] The second determining unit is specifically configured to:

[0035] The smaller of the stability coefficient of the single-leg curved equilateral angle steel and the stability coefficient of the straight equilateral angle steel is selected as the stability coefficient of the T-angle steel axial compression member when it is axially compressed.

[0036] The second determination unit determines the cross-sectional area of ​​the T-angle steel axial compression member according to the following formula:

[0037]

[0038] In the formula, A is the cross-sectional area of ​​the T-angle steel axial compression member; N is the bearing capacity of the T-angle steel axial compression member; f is the yield strength of the steel used in the T-angle steel axial compression member; It is the stability coefficient of the T-angle steel axial compression member when it is subjected to axial compression.

[0039] The second determining module is specifically used for:

[0040] Based on the cross-sectional area, the specification of the T-angle steel axial compression member is determined by querying the combined section property table.

[0041] Compared with the closest prior art, the technical solution provided by the present invention has the following beneficial effects:

[0042] In the method for determining the specifications of a T-angle steel axial compression component provided by the present invention, the T-angle steel axial compression component includes a single-leg fire-curved equilateral angle steel and a straight equilateral angle steel connected by bolts; the fire-curved section length of the T-angle steel axial compression component is obtained; the cross-sectional area of ​​the T-angle steel axial compression component is determined based on the fire-curved section length and the slenderness ratio of the T-angle steel axial compression component; the specifications of the T-angle steel axial compression component are determined based on the cross-sectional area, and the cross-sectional area of ​​the T-angle steel axial compression component is determined only by the fire-curved section length and the slenderness ratio, which not only improves the calculation accuracy, but also accurately and efficiently obtains the specifications of the T-angle steel axial compression component;

[0043] The technical solution provided by the present invention clearly provides a cross-sectional area calculation process of a T-angle steel axial compression member including a single-leg fire-bent equal-leg angle steel. The process only uses a bearing capacity reduction factor and directly obtained bearing capacity and steel yield strength, and uses fewer parameters, thereby improving calculation accuracy.

[0044] The technical solution provided by the present invention provides a theoretical basis for the application of T-shaped angle steel axial compression components composed of single-leg fire-bent equal-leg angle steels in the inclined materials of transmission towers, filling the gap in the current relevant design specifications for the selection of specifications of T-shaped angle steel axial compression components composed of single-leg fire-bent equal-leg angle steels. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 is a flow chart of a method for determining specifications of a T-angle steel axial compression member in an embodiment of the present invention;

[0046] Figure 2 It is a plan view of a T-angle steel axial compression member in an embodiment of the present invention;

[0047] Figure 3 1 is a first stereoscopic view of a T-angle steel axial compression member in an embodiment of the present invention;

[0048] Figure 4 is a second stereoscopic view of a T-angle steel axial compression member in an embodiment of the present invention;

[0049] Figure 5is a third stereoscopic view of a T-angle steel axial compression member in an embodiment of the present invention;

[0050] Figure 6 is a fourth stereoscopic view of a T-angle steel axial compression member according to an embodiment of the present invention;

[0051] In the figure, 1-single-leg fire-curved equilateral angle steel, 2-straight equilateral angle steel. DETAILED DESCRIPTION

[0052] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0053] Example 1

[0054] Embodiment 1 of the present invention provides a method for determining the specifications of a T-angle steel axial compression member, such as Figure 2 As shown, the T-angle steel axial compression member includes a single-leg fire-curved equilateral angle steel 1 and a straight equilateral angle steel 2 connected by bolts, and its three-dimensional stereogram is as shown in Figures 3 to 6 shown.

[0055] The specific process of determining the specifications of T-angle steel axial compression components is as follows: Figure 1 As shown:

[0056] S101: Obtain the length of the fire curved section of the T-angle steel axial compression member;

[0057] S102: determining the cross-sectional area of ​​the T-angle steel axial compression member based on the length of the fire curve section and the slenderness ratio of the T-angle steel axial compression member;

[0058] S103: Determine the specifications of the T-angle steel axial compression member based on the cross-sectional area.

[0059] Determining the cross-sectional area of ​​the T-angle steel axial compression member based on the length of the fire curved section and the slenderness ratio of the T-angle steel axial compression member includes:

[0060] The bearing capacity reduction factor of the T-angle steel member is calculated based on the fire curve length and slenderness ratio of the T-angle steel axial compression member;

[0061] Based on the stability coefficient of the single-leg fire-bent equal-leg angle steel and the stability coefficient of the straight equal-leg angle steel, the stability coefficient of the T-angle steel member under axial compression is determined, and then the cross-sectional area of ​​the T-angle steel member is obtained;

[0062] Among them, the slenderness ratio is determined based on the calculated length of the T-angle steel axial compression member, and the calculated length is determined according to the calculation length table of cross diagonals and K-shaped diagonals in the "Technical Specifications for Structural Design of Overhead Transmission Line Towers" (DL / T 5154-2012).

[0063] The bearing capacity reduction factor n of the T-angle steel axial compression member is determined by the following formula:

[0064]

[0065] Where d is the length of the fire curved section of the T-angle steel axial compression member; λ is the slenderness ratio of the T-angle steel axial compression member.

[0066] The stability coefficient of the T-angle steel member under axial compression is determined based on the stability coefficient of the single-leg fire-bent equal-leg angle steel and the stability coefficient of the straight equal-leg angle steel, including:

[0067] The smaller of the stability coefficient of the single-leg curved equilateral angle steel and the stability coefficient of the straight equilateral angle steel is selected as the stability coefficient of the T-angle steel axial compression member when it is axially compressed.

[0068] The cross-sectional area of ​​the T-angle steel axial compression member is determined by the following formula:

[0069]

[0070] In the formula, A is the cross-sectional area of ​​the T-angle steel axial compression member, N is the bearing capacity of the T-angle steel axial compression member, and f is the yield strength of the steel used in the T-angle steel axial compression member. It is the stability coefficient of the T-angle steel axial compression member when it is subjected to axial compression.

[0071] Determine the specifications of T-angle steel axial compression members based on the cross-sectional area, including:

[0072] Based on the cross-sectional area, the specifications of the T-angle steel axial compression member are determined by consulting the combined section property table.

[0073] Example 2

[0074] Based on the same inventive concept, the second embodiment of the present invention further provides a device for determining the specifications of a T-shaped angle steel axial compression member, wherein the T-shaped angle steel axial compression member includes a single-leg fire-curved equal-leg angle steel and a straight equal-leg angle steel connected by bolts. The functions of each component are described in detail below:

[0075] An acquisition module is used to obtain the length of the fire curved section of the T-angle steel axial compression member;

[0076] The first determination module is used to determine the cross-sectional area of ​​the T-angle steel axial compression component based on the fire curved section length and the slenderness ratio of the T-angle steel axial compression component;

[0077] The second determination module is used to determine the specifications of the T-angle steel axial compression member based on the cross-sectional area.

[0078] The first determination module includes:

[0079] The first determination unit is used to calculate the bearing capacity reduction factor of the T-angle steel member based on the fire curved section length and slenderness ratio of the T-angle steel axial compression member;

[0080] The second determination unit is used to determine the stability coefficient of the T-shaped angle steel member when it is axially compressed based on the stability coefficient of the single-leg fire-curved equal-leg angle steel and the stability coefficient of the straight equal-leg angle steel, and then obtain the cross-sectional area of ​​the T-shaped angle steel member;

[0081] Among them, the slenderness ratio is determined based on the calculated length of the T-angle steel axial compression member.

[0082] The first determination unit determines the bearing capacity reduction factor n of the T-angle steel axial compression member according to the following formula:

[0083]

[0084] Where d is the length of the fire curved section of the T-angle steel axial compression member; λ is the slenderness ratio of the T-angle steel axial compression member.

[0085] The second determining unit selects the smaller of the stability coefficient of the single-leg fire-curved equilateral angle steel and the stability coefficient of the straight equilateral angle steel as the stability coefficient of the T-angle steel axial compression member when the axial center is compressed.

[0086] The second determination unit determines the cross-sectional area of ​​the T-angle steel axial compression member according to the following formula:

[0087]

[0088] In the formula, A is the cross-sectional area of ​​the T-angle steel axial compression member; N is the bearing capacity of the T-angle steel axial compression member; f is the yield strength of the steel used in the T-angle steel axial compression member; It is the stability coefficient of the T-angle steel axial compression member when it is subjected to axial compression.

[0089] The second determination module is specifically used for:

[0090] Based on the cross-sectional area, the specification of the T-angle steel axial compression member is determined by querying the combined section property table.

[0091] For the convenience of description, the various parts of the above-mentioned device are divided into various modules or units according to their functions and described separately. Of course, when implementing the present application, the functions of each module or unit can be implemented in the same or multiple software or hardware.

[0092] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0093] 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.

[0094] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0095] 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 The steps for the functions specified in one or more boxes.

[0096] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Ordinary technicians in the relevant field can still modify or make equivalent substitutions to the specific implementation methods of the present invention with reference to the above embodiments. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention are within the scope of protection of the claims of the present invention to be approved.

Claims

1. A method for determining the specifications of a T-angle steel axial compression member, wherein the T-angle steel axial compression member comprises a single-leg fire-curved equilateral angle steel and a straight equilateral angle steel connected by bolts; characterized in that: The method comprises: Get the length of the fire curved section of the T-angle steel axial compression member; Determine the cross-sectional area of ​​the T-angle steel axial compression member based on the length of the fire curved section and the slenderness ratio of the T-angle steel axial compression member; Determining the specifications of the T-angle steel axial compression member based on the cross-sectional area; The determining of the cross-sectional area of ​​the T-angle steel axial compression component based on the fire curved section length and the slenderness ratio of the T-angle steel axial compression component comprises: The bearing capacity reduction factor of the T-angle steel member is calculated based on the fire curve length and slenderness ratio of the T-angle steel axial compression member; Based on the stability coefficient of the single-leg fire-bent equal-leg angle steel and the stability coefficient of the straight equal-leg angle steel, the stability coefficient of the T-angle steel member under axial compression is determined, and then the cross-sectional area of ​​the T-angle steel member is obtained; Wherein, the slenderness ratio is determined based on the calculated length of the T-angle steel axial compression member; The bearing capacity reduction factor of the T-angle steel member is calculated as follows: In the formula, n is the bearing capacity reduction factor of the T-angle steel axial compression member, d is the length of the fire section of the T-angle steel axial compression member, is the slenderness ratio of the T-angle steel axial compression member; The method of determining the stability coefficient of the T-shaped angle steel member under axial compression based on the stability coefficient of the single-leg fire-curved equal-leg angle steel and the stability coefficient of the straight equal-leg angle steel includes: The smaller of the stability coefficient of the single-leg fire-curved equal-leg angle steel and the stability coefficient of the straight equal-leg angle steel is selected as the stability coefficient of the T-angle steel axial compression member under axial compression; The cross-sectional area of ​​the T-angle steel axial compression member is determined by the following formula: In the formula, A is the cross-sectional area of ​​the T-angle steel axial compression member, N is the bearing capacity of the T-angle steel axial compression member, f is the yield strength of the steel used in the T-angle steel axial compression member. It is the stability coefficient of the T-angle steel axial compression member when it is subjected to axial compression.

2. The method for determining the specifications of T-angle steel axial compression members according to claim 1, characterized in that: The determining of the specifications of the T-angle steel axial compression member based on the cross-sectional area includes: Based on the cross-sectional area, the specification of the T-angle steel axial compression member is determined by querying the combined section property table.

3. A device for determining the specifications of a T-angle steel axial compression member, wherein the T-angle steel axial compression member comprises a single-leg fire-curved equilateral angle steel and a straight equilateral angle steel connected by bolts; characterized in that: The device comprises: An acquisition module is used to obtain the length of the fire curved section of the T-angle steel axial compression member; A first determination module is used to determine the cross-sectional area of ​​the T-angle steel axial compression component based on the fire curved section length and the slenderness ratio of the T-angle steel axial compression component; A second determination module is used to determine the specifications of the T-angle steel axial compression member based on the cross-sectional area; The first determining module comprises: The first determination unit is used to calculate the bearing capacity reduction factor of the T-angle steel member based on the fire curved section length and slenderness ratio of the T-angle steel axial compression member; The second determination unit is used to determine the stability coefficient of the T-shaped angle steel member when it is axially compressed based on the stability coefficient of the single-leg fire-curved equal-leg angle steel and the stability coefficient of the straight equal-leg angle steel, and then obtain the cross-sectional area of ​​the T-shaped angle steel member; Wherein, the slenderness ratio is determined based on the calculated length of the T-angle steel axial compression member; The first determination unit determines the bearing capacity reduction factor of the T-angle steel axial compression member according to the following formula: In the formula, n is the bearing capacity reduction factor of the T-angle steel axial compression member, d is the length of the fire curved section of the T-angle steel axial compression member; is the slenderness ratio of the T-angle steel axial compression member; The second determining unit is specifically configured to: The smaller of the stability coefficient of the single-leg fire-curved equal-leg angle steel and the stability coefficient of the straight equal-leg angle steel is selected as the stability coefficient of the T-angle steel axial compression member under axial compression; The second determination unit determines the cross-sectional area of ​​the T-angle steel axial compression member according to the following formula: In the formula, A is the cross-sectional area of ​​the T-angle steel axial compression member; N is the bearing capacity of the T-angle steel axial compression member; f It is the yield strength of the steel used in the T-angle steel axial compression member; It is the stability coefficient of the T-angle steel axial compression member when it is subjected to axial compression.

4. The device for determining the specifications of the T-angle steel axial compression member according to claim 3, characterized in that: The second determining module is specifically used for: Based on the cross-sectional area, the specification of the T-angle steel axial compression member is determined by querying the combined section property table.

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