A calculation method for the compressive bearing capacity of high-strength double-T-shaped composite members

Abstract

The present invention provides a method for calculating the compressive bearing capacity of a high-strength double-T-shaped composite member, comprising the following steps: calculating the slenderness ratio λ of the composite member based on the length and the gyration radius of the cross-section of the high-strength double-T-shaped composite member; calculating the regularized slenderness ratio #imgabs0# based on the slenderness ratio λ of the composite member; determining a calculation method for the stability coefficient based on the result of the regularized slenderness ratio #imgabs1# and calculating the stability coefficient #imgabs2#; and determining a length correction coefficient α based on the result of the regularized slenderness ratio #imgabs3#. λ The value or calculation method of , and get the length correction coefficient α λ The thin-wall correction coefficient α is calculated based on the width and thickness of the single L-shaped component in the high-strength double T-shaped composite member. bt The functional relationship between the maximum compressive bearing capacity of high-strength double-T-shaped composite components and the area of single T-shaped components is established. This can effectively ensure the reliability and effectiveness of the compressive bearing capacity of the double-T-shaped high-strength components of transmission towers.

Description

Technical Field

[0001] The present invention relates to the technical field of compressive bearing capacity of composite components, and in particular to a method for calculating the compressive bearing capacity of a high-strength double-T-shaped composite component. Background Art

[0002] With the rapid development of power transmission lines, the terrain they traverse is becoming increasingly complex, and the weather conditions are becoming more severe. They often traverse areas of extremely heavy ice, with ice thickness reaching 40mm or more. Under these conditions, the loads borne by transmission tower structures are approximately 2 to 4 times that of conventional towers. Traditional L-shaped equilateral members, or even double L-shaped cross members, are no longer able to withstand such enormous loads. The cross-sectional shape of traditional angle steel must be modified to withstand such enormous loads. This is why the double-T-shaped structure was developed. The cross-sectional area of the double-T-shaped member is at least four times that of a single L-shaped member, and the bearing capacity is also increased by approximately four times, effectively solving the problem of heavy loads on transmission towers.

[0003] However, the structural type of the double T-shaped component is different from the traditional structural type, and its compressive bearing capacity lacks a corresponding theoretical calculation method. Therefore, this patent combines research and proposes an appropriate theoretical calculation method for compressive bearing capacity. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems in the prior art, namely, the lack of a theoretical calculation method for the compressive bearing capacity of double T-shaped components and the fact that the existing calculation method is not applicable to double T-shaped components.

[0005] To this end, the present invention provides a method for calculating the compressive bearing capacity of a high-strength double-T-shaped composite member.

[0006] The present invention provides a method for calculating the compressive bearing capacity of a high-strength double-T-shaped composite component, wherein the high-strength double-T-shaped composite component comprises two single-T-shaped components, which are arranged opposite to each other and connected by a combination bolt; the single-T-shaped component comprises two L-shaped components, which are arranged opposite to each other and connected by a combination bolt; and the method comprises the following steps:

[0007] S1. Calculate the slenderness ratio λ of the high-strength double-T composite member based on the length and cross-sectional radius of gyration of the composite member;

[0008] S2, calculate the regularized slenderness ratio based on the slenderness ratio λ of the composite member obtained in S1

[0009] S3, according to the regularized slenderness ratio The result size is used to determine the calculation method of the stability coefficient and calculate the stability coefficient

[0010] S4, according to the regularized slenderness ratio The resulting size determines the length correction factor α λ The value or calculation method of , and get the length correction coefficient α λ The value of

[0011] S5. Calculate the thin-wall correction factor α based on the width and thickness of a single L-shaped component in a high-strength double-T composite member. bt ;

[0012] S6. Establish a functional relationship between the maximum compressive bearing capacity that the high-strength double-T-shaped composite member can withstand and the area of the single T-shaped member, and use the length correction factor and thin-wall correction factor obtained in S4 and S5 to correct the functional relationship.

[0013] The method for calculating the compressive bearing capacity of a high-strength double-T-shaped composite member according to the above technical solution of the present invention may also have the following additional technical features:

[0014] In the above technical solution, the maximum compressive bearing capacity N that the S6 medium-high strength double T-shaped composite member can withstand is max for:

[0015]

[0016] Wherein, N is the axial pressure borne by the high-strength double T-shaped composite member; N max A is the maximum compressive bearing capacity that a high-strength double T-shaped composite member can withstand; T is the area of a single T-shaped member; α λ is the length correction factor of the high-strength double-T-shaped composite member; α bt is the thin-wall correction factor of high-strength double-T-shaped composite components; N is the stability strength reduction factor of the compression member; is the stability factor of the high-strength double T-shaped composite member; f y is the yield strength of the high-strength double-T-shaped composite member; γ R It is the material partial factor of high-strength double T-shaped composite member.

[0017] In the above technical solution, the calculation method of the slenderness ratio λ of the high-strength double-T-shaped composite member S1 is:

[0018]

[0019] Where L is the length of the composite component; I is the minimum moment of inertia of the composite component.

[0020] In the above technical solution, the regularized slenderness ratio in S2 The calculation method is:

[0021]

[0022] Where: f y is the yield strength of the double T member; E is the elastic modulus of the high-strength double T-shaped composite member.

[0023] In the above technical solution, the stability coefficient in S3 The calculation method is as follows:

[0024] when hour:

[0025]

[0026] when hour:

[0027]

[0028] In the above technical solution, the length correction coefficient α in S4 is λ The calculation method is as follows:

[0029]

[0030] In the above technical solution, the thin wall correction coefficient α in S5 bt The calculation method is:

[0031]

[0032] Wherein, b is the limb width of a single L-shaped component; t is the limb thickness of a single L-shaped component.

[0033] Any of the above technical solutions further includes the following steps:

[0034] S7. Calculate the most unfavorable net cross-sectional area of high-strength double-T-shaped composite members;

[0035] S8. Calculate the maximum net cross-sectional compressive bearing capacity that the high-strength double-T composite member can withstand.

[0036] In the above technical solution, the calculation method for the maximum net section compressive bearing capacity that the S8 medium-high strength double T-shaped composite member can withstand is:

[0037]

[0038] Among them, N n，max f is the maximum net section compressive bearing capacity that the high-strength double T-shaped composite member can withstand; u A is the tensile strength of the component; Tn It is the most unfavorable net cross-sectional area of the high-strength double T-shaped composite member.

[0039] In the above technical solution, the calculation method of the most unfavorable net cross-sectional area in S7 is:

[0040] S71. Subtract the area of the vacant position on the gross cross-section caused by the screw hole from the gross cross-section area of the single L-shaped component;

[0041] S72, repeating step S71 for different gross cross-sections to obtain several net cross-sectional areas;

[0042] S73. Select the smallest net cross-sectional area in S72 and multiply it by two as the most unfavorable net cross-sectional area of the high-strength double T-shaped composite member.

[0043] In summary, due to the adoption of the above technical features, the beneficial effects of the present invention are:

[0044] A calculation method for the compressive bearing capacity of high-strength double-T-shaped composite components is provided. The size design of high-strength double-T-shaped composite components is realized based on the compressive bearing capacity of the stable and net cross-sections. This can effectively ensure the reliability and effectiveness of the compressive bearing capacity of the double-T-shaped high-strength components of the transmission tower, thereby avoiding the tilting or even collapse of the transmission tower due to the composite components not meeting the requirements, and ensuring the safe and stable operation of the power system. In addition, reasonable component design is adopted to ensure that the selection of composite components is economical.

[0045] Additional aspects and advantages of the invention will become apparent from the description which follows, or may be learned by practice of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0047] Figure 1 This is a flow chart of a method for calculating the compressive bearing capacity of a high-strength double-T-shaped composite member according to one embodiment of the present invention;

[0048] Figure 2 This is a structural diagram of a traditional L-shaped equilateral member;

[0049] Figure 3 This is a structural diagram of a traditional double L-shaped cross member;

[0050] Figure 4 This is a structural diagram of a high-strength double-T-shaped composite member in a method for calculating the compressive bearing capacity of a high-strength double-T-shaped composite member according to one embodiment of the present invention;

[0051] Figure 5 This is a schematic diagram showing the most unfavorable net cross-sectional area calculation principle in a method for calculating the compressive bearing capacity of a high-strength double-T-shaped composite member according to an embodiment of the present invention. DETAILED DESCRIPTION

[0052] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other.

[0053] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0054] Refer to the following Figures 1 to 5 A method for calculating the compressive bearing capacity of a high-strength double-T-shaped composite member provided in accordance with some embodiments of the present invention will be described.

[0055] Some embodiments of the present application provide a method for calculating the compressive bearing capacity of a high-strength double-T-shaped composite member.

[0056] like Figures 1 to 5 As shown, the first embodiment of the present invention proposes a method for calculating the compressive bearing capacity of a high-strength double-T-shaped composite member, as shown in FIG. Figure 4 As shown, the high-strength double-T-shaped composite member includes two single-T-shaped members, which are arranged opposite to each other and connected by a combination bolt; the single-T-shaped member includes two L-shaped components, which are arranged opposite to each other and connected by a combination bolt; the butt spacing between the two single-T-shaped members is s, when s>0mm, a splint needs to be provided in the middle, and when s=0mm, a combination bolt connection can be directly adopted. In all embodiments in this specification, s=0mm is used. The method includes the following steps:

[0057] S1. Calculate the slenderness ratio λ of the high-strength double-T composite member based on the length and cross-sectional radius of gyration of the composite member;

[0058] The calculation method of the slenderness ratio λ of the high-strength double-T composite member in S1 is:

[0059]

[0060] Where L is the length of the composite component; I is the minimum moment of inertia of the composite component.

[0061] S2, calculate the regularized slenderness ratio based on the slenderness ratio λ of the composite member obtained in S1

[0062] Regularized slenderness ratio in S2 The calculation method is:

[0063]

[0064] Where: fy is the yield strength of the double T member; E is the elastic modulus of the high-strength double T-shaped composite member, which is 2×10 5 MPa.

[0065] S3, according to the regularized slenderness ratio The result size is used to determine the calculation method of the stability coefficient and calculate the stability coefficient

[0066] S3 medium stability factor The calculation method is as follows:

[0067] when hour:

[0068]

[0069] when hour:

[0070]

[0071] S4, according to the regularized slenderness ratio The resulting size determines the length correction factor α λ The value or calculation method of , and obtain the length correction coefficient α λ The value of

[0072] S4 length correction factor α λ The calculation method is as follows:

[0073]

[0074] S5. Calculate the thin-wall correction factor α based on the width and thickness of a single L-shaped component in a high-strength double-T composite member. bt ;

[0075] Thin wall correction factor α in S5 bt The calculation method is:

[0076]

[0077] Wherein, b is the limb width of a single L-shaped component; t is the limb thickness of a single L-shaped component.

[0078] S6. Establish a functional relationship between the maximum compressive bearing capacity that the high-strength double-T-shaped composite member can withstand and the area of the single T-shaped member, and use the length correction factor and thin-wall correction factor obtained in S4 and S5 to correct the functional relationship.

[0079] The maximum compressive bearing capacity N that medium and high strength double T-shaped composite members can withstand max for:

[0080]

[0081] Wherein, N is the axial pressure borne by the high-strength double T-shaped composite member; N max A is the maximum compressive bearing capacity that a high-strength double T-shaped composite member can withstand; T is the area of a single T-shaped member; α λ is the length correction factor of the high-strength double-T-shaped composite member; α bt is the thin-wall correction factor of high-strength double-T-shaped composite components; N is the stability strength reduction factor of the compression member, which can be taken as 1.0 for the composite member in this embodiment; is the stability factor of the high-strength double T-shaped composite member; f y is the yield strength of the high-strength double-T-shaped composite member; γ R It is the material partial coefficient of high-strength double-T-shaped composite components, which is 1.09 for Q235, 1.15 for Q355, and 1.125 for Q420.

[0082] The second embodiment of the present invention proposes a method for calculating the compressive bearing capacity of a high-strength double-T-shaped composite member, and based on the first embodiment, as Figures 1 to 5 As shown, the following steps are included:

[0083] S1. Calculate the slenderness ratio λ of the high-strength double-T composite member based on the length and cross-sectional radius of gyration of the composite member;

[0084] S2, calculate the regularized slenderness ratio based on the slenderness ratio λ of the composite member obtained in S1

[0085] S3, according to the regularized slenderness ratio The result size is used to determine the calculation method of the stability coefficient and calculate the stability coefficient

[0086] S4, according to the regularized slenderness ratio The resulting size determines the length correction factor α λ The value or calculation method of , and get the length correction coefficient α λ The value of

[0087] S5. Calculate the thin-wall correction factor α based on the width and thickness of a single L-shaped component in a high-strength double-T composite member. bt ;

[0088] S6. Establish a functional relationship between the maximum compressive bearing capacity that the high-strength double-T-shaped composite member can withstand and the area of the single T-shaped member, and use the length correction factor and thin-wall correction factor obtained in S4 and S5 to correct the functional relationship;

[0089] S7. Calculate the most unfavorable net cross-sectional area of high-strength double-T-shaped composite members;

[0090] The calculation method of the most unfavorable net cross-sectional area in S7 is:

[0091] S71. Subtract the area of the vacant position on the gross cross-section caused by the screw hole from the gross cross-section area of the single L-shaped component;

[0092] S72, repeating step S71 for different gross cross-sections to obtain several net cross-sectional areas;

[0093] S73. Select the smallest net cross-sectional area in S72 and multiply it by two as the most unfavorable net cross-sectional area of the high-strength double T-shaped composite member.

[0094] Specifically, due to the large number of connecting bolts in the high-strength double T-shaped composite component, the diameter of the bolts will greatly weaken the cross-section, and the compressive strength of the net cross-section needs to be considered. The arrangement of the bolts at the joint is staggered, and the bolts of a single L-shaped component can be arranged locally as follows: Figure 5 Style shown;

[0095] Under this style, when calculating its most unfavorable net cross-sectional area, there are two cases, namely II net cross-section and II-II net cross-section, which can be calculated as follows:

[0096] A Ln,I-I =A I-I -2d0t

[0097] A Ln,II-II =A II-II -3d0t

[0098] A Tn =2A Ln,min =2min(A Ln,I-I, A Ln,II-II )

[0099] Among them, A I-I A is the gross cross-sectional area of a single L-shaped component along section II; II-II A is the gross cross-sectional area of a single L-shaped component along the II-II section; Ln,I-I A is the net cross-sectional area of a single L-shaped component along section II; Ln,II-II A is the net cross-sectional area of a single L-shaped component along the II-II section; Ln,min A is the minimum net cross-sectional area of a single L-shaped component; Tn It is the most unfavorable net cross-section of the double T component; d0 is the bolt hole diameter, which is generally taken as the bolt diameter + 1.5mm.

[0100] S8. Calculate the maximum net cross-sectional compressive bearing capacity that the high-strength double-T composite member can withstand.

[0101] The calculation method for the maximum net section compressive bearing capacity that the S8 medium-high strength double T-shaped composite member can withstand is:

[0102]

[0103] Among them, N n，max f is the maximum net section compressive bearing capacity that the high-strength double T-shaped composite member can withstand; u A is the tensile strength of the component; Tn It is the most unfavorable net cross-sectional area of the high-strength double T-shaped composite member.

[0104] At this time, the maximum compressive bearing capacity that the high-strength double T-shaped composite component can withstand, i.e., the stable compressive bearing capacity, obtained in step S6, and the maximum net cross-sectional compressive bearing capacity that the high-strength double T-shaped composite component can withstand, obtained in step S8, are compared with the axial pressure actually borne by the high-strength double T-shaped composite component, respectively, so that the bearing capacity of the high-strength double T-shaped composite component can meet the actual axial pressure borne while maintaining a certain margin, thereby realizing the design of the area and cross-sectional dimensions of the high-strength double T-shaped composite component.

[0105] In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in any one or more embodiments or examples.

[0106] Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for calculating the compressive bearing capacity of a high-strength double-T-shaped composite member, wherein the high-strength double-T-shaped composite member comprises two single-T-shaped members, the two single-T-shaped members are arranged opposite to each other and connected by a combination bolt; the single-T-shaped member comprises two L-shaped components, the two L-shaped components are arranged opposite to each other and connected by a combination bolt, characterized in that: The following steps are involved: S1. Calculate the slenderness ratio of the high-strength double T-shaped composite member based on its length and cross-sectional radius of gyration. ; S2, slenderness ratio of composite member calculated based on S1 Calculate the regularized slenderness ratio ; S3, according to the regularized slenderness ratio The result size is used to determine the calculation method of the stability coefficient and calculate the stability coefficient ; S4, according to the regularized slenderness ratio The resulting size determines the length correction factor The value or calculation method of , and get the length correction coefficient The value of S5. Calculate the thin-wall correction factor based on the width and thickness of a single L-shaped component in a high-strength double-T composite member. ; S6. Establish a functional relationship between the maximum compressive bearing capacity that the high-strength double-T-shaped composite member can withstand and the area of the single T-shaped member, and use the length correction factor and thin-wall correction factor obtained in S4 and S5 to correct the functional relationship; Regularized slenderness ratio in S2 The calculation method is: in: is the yield strength of the double-T member; is the elastic modulus of the high-strength double T-shaped composite member; S3 medium stability factor The calculation method is as follows: When the regularized slenderness ratio hour: when hour: S4 medium length correction factor The calculation method is as follows: S5 thin wall correction factor The calculation method is: in, is the limb width of a single L-shaped component; is the limb thickness of a single L-shaped component; The maximum compressive bearing capacity that S6 medium and high strength double T-shaped composite components can withstand for: in, The axial pressure borne by the high-strength double T-shaped composite member; It is the maximum compressive bearing capacity that a high-strength double-T-shaped composite member can withstand; is the area of a single T-shaped member; is the stability strength reduction factor of the compression member; It is the material partial factor of high-strength double T-shaped composite member.

2. A method for calculating the compressive bearing capacity of a high-strength double-T-shaped composite member according to claim 1, characterized in that: Slenderness ratio of medium and high strength double T-shaped composite members The calculation method is: in, is the length of the composite member; is the minimum moment of inertia of the composite component.

3. The method for calculating the compressive bearing capacity of a high-strength double-T-shaped composite member according to claim 1, characterized in that: The following steps are also included: S7. Calculate the most unfavorable net cross-sectional area of high-strength double-T-shaped composite members; S8. Calculate the maximum net cross-sectional compressive bearing capacity that the high-strength double-T composite member can withstand.

4. A method for calculating the compressive bearing capacity of a high-strength double-T-shaped composite member according to claim 3, characterized in that: The calculation method for the maximum net section compressive bearing capacity that the S8 medium-high strength double T-shaped composite member can withstand is: in, It is the maximum net section compressive bearing capacity that the high-strength double T-shaped composite member can withstand; is the tensile strength of the component; It is the most unfavorable net cross-sectional area of the high-strength double T-shaped composite member.

5. A method for calculating the compressive bearing capacity of a high-strength double-T-shaped composite member according to claim 4, characterized in that: The calculation method of the most unfavorable net cross-sectional area in S7 is: S71. Subtract the area of the vacant position on the gross cross-section caused by the screw hole from the gross cross-section area of the single L-shaped component; S72, repeating step S71 for different gross cross-sections to obtain several net cross-sectional areas; S73. Select the smallest net cross-sectional area in S72 and multiply it by two as the most unfavorable net cross-sectional area of the high-strength double T-shaped composite member.

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