Method and system for calculating bearing capacity of steel pipe parallel insertion plate annular stiffening rib joint

Abstract

The invention relates to a method and system for calculating the bearing capacity of a steel pipe parallel insertion plate annular stiffening rib joint, and belongs to the technical field of structural engineering. The method comprises the following steps: firstly, converting the section of a circumferential stiffening plate into a simply supported beam model with a T-shaped section under the elastic-plastic assumption of node steel, calculating the node bearing capacity P1 considering the influence of the ratio of the width of the stiffening rib to the diameter of a main pipe according to different formulas according to conditions, then calculating the node bearing capacity P2 considering the buckling condition of the stiffening rib according to the formulas, and finally, calculating the node bearing capacity P1. And P1 and P2 are compared, and the maximum bending moment value Mmax of the node bearing capacity is calculated. Comparison verification is carried out on a calculation result of the method, a test result of a node with corresponding size parameters and a finite element calculation result, it is found that the calculation result can meet the related requirements of the steel pipe node with the parallel insertion plate and the annular stiffening rib, and reliable reference is provided for node design in actual engineering; and popularization and application of the steel pipe parallel insertion plate annular stiffening rib joint are facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of structural engineering, and in particular to a method and system for calculating the bearing capacity of a steel pipe parallel plug plate annular stiffening rib node. Background Art

[0002] As an important form of steel tube node, steel tube plug-in node is widely used in transmission towers due to its flexible size design, easy construction by bolt connection and easy transportation of components. There is also a lot of existing research on its bearing capacity theory.

[0003] As the demand for electricity continues to increase, the size and form of transmission towers also need to be improved to improve the efficiency of transmission lines, and new node forms need to be introduced to meet the structural force optimization and bearing capacity requirements of actual power transmission tower projects in the power industry. There are many bearing capacity calculation methods involved in the existing technology, mainly including: The invention patents with publication numbers CN101295329A and CN101359344A respectively disclose a method for calculating the bearing capacity of rectangular steel tube and square steel tube welded ball nodes, which include a method for calculating the bearing capacity under axial force and a method for calculating the bearing capacity under the combined action of axial force and bending moment. The invention patent with publication number CN119493944A discloses a method for calculating the shear bearing capacity of a composite steel tube concrete column-steel beam node with a floor slab, which provides a specific calculation method for the precise calculation method of the shear bearing capacity of a composite steel tube concrete column-steel beam node with a floor slab, especially. The invention patent with publication number CN117236092B discloses a method for calculating the bearing capacity of a steel tube X-shaped reinforced intersecting welded node. Its new method for calculating the bearing capacity of a steel tube X-shaped reinforced intersecting welded node that takes into account the contribution of reinforcement makes the calculation results more consistent with the test conditions, further improving the economy of the design of the steel tube X-shaped reinforced intersecting welded node. The invention patent with publication number CN113836658B discloses a method for calculating the compressive design bearing capacity of a Y-type cast steel node, which can solve the problem that the compressive design bearing capacity of a Y-type cast steel node cannot be directly calculated in the prior art. The invention patent with publication number CN117763697A discloses a method for calculating the shear bearing capacity of an open-hole beam considering the reinforcement of an internal steel pipe, which considers the reinforcement effect of the internal steel pipe on the open-hole beam, and equates the compressive stress flow generated by the internal steel pipe to the compression rod in the STM, and establishes a method for calculating the shear bearing capacity of an open-hole beam considering the reinforcement of the internal steel pipe, filling the gap in the calculation method based on the compression rod-tension rod model for the open-hole beam reinforced with the internal steel pipe.

[0004] Therefore, few people have studied the bearing capacity of steel tube plug-in plate nodes. Moreover, the steel tube parallel plug-in plate annular stiffening rib node is a newer form of steel tube plug-in plate node. After sufficient experiments and simulation analysis, it is found that its stress characteristics are significantly different from those of traditional steel tube plug-in plate nodes. It is obviously inappropriate to directly calculate the node bearing capacity according to the existing plug-in plate node design specifications. A reliable calculation method for the bearing capacity of the steel tube parallel plug-in plate annular stiffening rib node is needed. Summary of the invention

[0005] Purpose of the invention: In order to overcome the deficiencies of the above-mentioned prior art, the present invention provides a method for calculating the bearing capacity of a steel tube parallel plug plate annular stiffening rib node. The method is proposed to address the problem of inaccurate bearing capacity calculation when the traditional steel tube plug plate node calculation method is applied to the steel tube parallel plug plate annular stiffening rib node. In addition, the present invention also provides a bearing capacity calculation system for a steel tube parallel plug plate annular stiffening rib node.

[0006] Technical solution: According to a first aspect of the present invention, a method for calculating the bearing capacity of a steel tube parallel plate annular stiffening rib node is provided, the method comprising: Determine the structure of the steel pipe parallel plug plate annular stiffening rib node, that is, two parallel plug plates are fixed on the outer circumference of the annular main pipe, and two annular stiffening ribs are circumferentially arranged on the outer circumference of the main pipe, a certain distance is set between the two annular stiffening ribs, and two parallel plug plates are arranged between the two annular stiffening ribs; The cross section of the annular stiffener is set as a simply supported beam with a T-shaped cross section, so that the effective amplitude of the annular stiffener is obtained according to the Thurlimann calculation theory formula; A discriminant coefficient is introduced according to the effective amplitude, and a representation form of the node bearing capacity of the main buckling failure mode is obtained according to the relationship between the discriminant coefficient and the first threshold value; The node bearing capacity of the annular stiffener itself under buckling condition is obtained according to the bearing capacity influence coefficient; The node bearing capacity of the tube buckling failure mode is compared with the node bearing capacity of the annular stiffener buckling mode, and the smaller value is taken to predict the maximum bending moment value of the node bearing capacity, so as to obtain the bearing capacity of the steel tube parallel plug plate annular stiffener node; Wherein, the expression form of the node bearing capacity of the main buckling failure mode is obtained according to the relationship between the discrimination coefficient and the first threshold, including: The bearing capacity influence coefficient is obtained based on the relationship between the axial pressure applied to the main pipe and the yield load of the main pipe; According to the influence of the spacing of the parallel plug plates on the nodes, the corresponding node influence coefficient is obtained, wherein the spacing of the parallel plug plates is the distance between two parallel plug plates, and the node is the connection point between the two parallel plug plates and the annular stiffening rib; The node bearing capacity of the main pipe buckling failure mode is obtained according to the node influence coefficient and the bearing capacity influence coefficient.

[0007] Further, including: The effective amplitude of the annular stiffener obtained according to the Thurlimann calculation theory formula includes: The effective amplitude of the annular stiffener is obtained by Thurlimann calculation theory formula , expressed as: ;in, is the wall thickness of the main pipe, is the main pipe radius, is the thickness of the annular stiffener.

[0008] Further, including: The step of introducing a discrimination coefficient according to the effective amplitude includes: the discrimination coefficient is expressed as: ;in, is the height of the annular stiffener.

[0009] Further, including: The bearing capacity influence coefficient is obtained according to the relationship between the axial pressure applied to the main pipe and the yield load of the main pipe, including: If the ratio of the axial pressure applied to the main pipe to the yield load of the main pipe is not greater than the second threshold, the bearing capacity influence coefficient Otherwise, if the ratio of the axial pressure applied to the main pipe to the yield load of the main pipe is greater than the second threshold, the bearing capacity influence coefficient ; in, is the axial pressure applied to the main pipe, is the yield load of the main pipe, which is obtained by multiplying the cross-sectional area of ​​the main pipe by the yield strength.

[0010] Further, including: According to the influence of the spacing of the parallel plug plates on the nodes, the corresponding node influence coefficient is obtained, which is expressed as: ;in, is the diameter of the main pipe, is the distance between two parallel plates.

[0011] Further, including: The step of obtaining the node bearing capacity of the main tube buckling failure mode according to the node influence coefficient and the bearing capacity influence coefficient includes: When the discriminant coefficient When it is not greater than the first threshold, then: ; When the discriminant coefficient When it is greater than the first threshold, then: ;in, is the design strength of the annular stiffener.

[0012] Further, it includes: the node bearing capacity of the buckling condition of the annular stiffener itself is obtained according to the bearing capacity influence coefficient , expressed as: .

[0013] Further, including: The smaller value is taken to predict the maximum moment value of the node bearing capacity, so as to obtain the bearing capacity of the steel tube parallel plug plate annular stiffening rib node and the maximum moment value of the node bearing capacity. It is expressed as: ; in, B is the length of the insert plate, that is, the distance between the two annular stiffening ribs in the axial direction of the main pipe.

[0014] On the other hand, the present invention also provides a bearing capacity calculation system for a steel tube parallel plug plate annular stiffening rib node, the system comprising: The structure determination module is used to determine the structure of the steel pipe parallel plug plate annular stiffening rib node, that is, two parallel plug plates are fixed on the outer periphery of the annular main pipe, and two annular stiffening ribs are arranged in the outer periphery of the main pipe, a certain distance is set between the two annular stiffening ribs, and two parallel plug plates are arranged between the two annular stiffening ribs; The effective amplitude prediction module is used to set the cross section of the annular stiffener to a simply supported beam with a T-shaped cross section, so as to Thurlimann The effective amplitude of the annular stiffener is obtained by calculating the theoretical formula; A node bearing capacity calculation module for the main buckling failure mode, used to introduce a discriminant coefficient according to the effective amplitude, and obtain a representation of the node bearing capacity of the main buckling failure mode according to the relationship between the discriminant coefficient and the first threshold; A node bearing capacity calculation module for the buckling condition of the annular stiffener itself, used for obtaining the node bearing capacity of the buckling condition of the annular stiffener itself according to the bearing capacity influence coefficient; The maximum bending moment value calculation module of the node bearing capacity is used to compare the node bearing capacity of the tube buckling failure mode with the node bearing capacity of the annular stiffener itself under buckling conditions, and take the smaller value to predict the maximum bending moment value of the node bearing capacity, so as to obtain the bearing capacity of the steel tube parallel plug plate annular stiffener node; The node bearing capacity calculation module for the main buckling failure mode includes: A bearing capacity influence coefficient calculation unit is used to obtain the bearing capacity influence coefficient according to the relationship between the axial pressure applied to the main pipe and the yield load of the main pipe; A node influence coefficient calculation unit, used for obtaining a corresponding node influence coefficient according to the influence of the spacing of the parallel plug plates on the node, wherein the spacing of the parallel plug plates is the distance between the two parallel plug plates, and the node is the connection point between the two parallel plug plates and the annular stiffening rib; The node bearing capacity calculation unit is used to obtain the node bearing capacity of the main pipe buckling failure mode according to the node influence coefficient and the bearing capacity influence coefficient.

[0015] Beneficial effects: Compared with the prior art, the present invention has the following advantages: The present invention proposes a bearing capacity calculation method for a steel tube parallel plug plate annular stiffening rib node for the first time. The method considers the node bearing capacity of the main tube buckling failure mode and the node bearing capacity of the annular stiffening rib itself under the buckling condition, and determines the final node bearing capacity maximum bending moment value according to the size of the two bearing capacities; the node bearing capacity of the main tube buckling failure mode considers the influence of multiple factors, such as the influence of the main material axial force on the bearing capacity and the influence of the parallel plug plate spacing on the node bearing capacity, and is obtained by different calculation methods according to the relationship between the calculation coefficient and the threshold; the node bearing capacity of the annular stiffening rib itself under the buckling condition is obtained according to multiple parameters; finally, the calculated results of the present invention are compared and verified with the test results of the corresponding size parameter nodes and the finite element calculation results, and it is found that it can meet the requirements of setting the steel tube nodes under the parallel plug plates and the annular stiffening ribs, and provide a reliable reference for the node design in the actual project, which is conducive to the promotion and application of the steel tube parallel plug plate annular stiffening rib nodes. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a flow chart of the method for calculating the bearing capacity of the steel tube parallel plug plate annular stiffening rib node according to an embodiment of the present invention; Figure 2 It is a flow chart of a method for calculating the node bearing capacity of a main pipe buckling failure mode according to an embodiment of the present invention; Figure 3 A top view of a base steel pipe parallel insert plate annular stiffening rib node structure according to an embodiment of the present invention; Figure 4 It is a front view of the base steel pipe parallel plug plate annular stiffening rib node structure according to an embodiment of the present invention; Figure 5 It is an internal cross-sectional view of a node of a base steel pipe parallel plug plate annular stiffening rib according to an embodiment of the present invention; Figure 6 This is a schematic diagram of a T-shaped section simply supported beam model with a circular stiffening rib section converted according to an embodiment of the present invention; Among them, Figure 3-6 It includes: a plug plate 1, a main pipe 2, and annular stiffening ribs 3. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] In a first aspect of the present invention, a method for calculating the bearing capacity of a steel tube parallel plate annular stiffening rib node is provided. The method is calculated according to the following node bearing capacity formula obtained based on test and finite element analysis results: Figure 1 As shown, the method comprises the following steps: S1 determines the structure of the steel tube parallel plug plate annular stiffener node, such as Figure 3 As shown, the plug plate 1 of this structure is radially inserted into the annular main pipe 2, and the plug plate 1 includes at least two plug plates parallel to the axial direction of the main pipe 2, that is, the two plug plates 1 are respectively installed on the outer periphery of the main pipe 2, and the installation method can be welding. In addition, this embodiment does not limit the specific shape of the plug plate 1, as long as the width and height are measurable and the two sides are parallel to the axial direction of the main pipe 2.

[0019] In this embodiment, two annular stiffening ribs 3 with a certain height and thickness are arranged circumferentially on the outer circumference of the main pipe 2, and is the height of the annular stiffening rib 3 , and the two parallel insert plates 1 are located between the two annular stiffening ribs 3 .

[0020] like Figure 4 As shown, T is the wall thickness of the main tube 2, and D is the diameter of the main tube 2. Figure 5 As shown, B is the length of the insert plate 1, that is, the height of the insert plate in the axial direction of the main pipe, that is, the vertical distance between the two annular stiffening ribs 3, is the thickness of the annular stiffener 3, is the distance between two parallel plug boards 1.

[0021] S2 sets the cross section of the annular stiffener as a simply supported beam with a T-shaped cross section, thereby obtaining the effective amplitude of the annular stiffener according to the Thurlimann calculation theory formula.

[0022] In this embodiment, Figure 6 As shown, is the radius of the main pipe 2, and the effective amplitude of the annular stiffener can be obtained according to the Thurlimann calculation theory formula, which is expressed as: ;in, is the wall thickness of main pipe 2, is the radius of main tube 2, is the thickness of the annular stiffening rib 3.

[0023] S3 introduces the discrimination coefficient according to the effective amplitude , and according to the relationship between the discrimination coefficient and the first threshold, the expression form of the node bearing capacity of the main buckling failure mode is obtained.

[0024] The Japanese Transmission Steel Tube Tower Manufacturing Standard stipulates the calculation of the bearing capacity of the traditional single plug-in plate node, which involves a calculation coefficient. In this embodiment, in order to calculate the node bearing capacity of the main tube buckling failure mode, the discriminant coefficient is used K as an intermediate parameter.

[0025] Preferably, introducing a discrimination coefficient according to the effective amplitude includes: the discrimination coefficient is expressed as: ; in, is the height of the annular stiffener.

[0026] Among them, in this embodiment, in step S3, according to the relationship between the discrimination coefficient and the first threshold, the expression form of the node bearing capacity of the main buckling failure mode is obtained, such as Figure 2 As shown, it includes: S31 obtaining the bearing capacity influence coefficient according to the relationship between the axial pressure applied to the main pipe and the yield load of the main pipe.

[0027] Specifically, the bearing capacity influence coefficient To calculate the influence coefficient of the main material axial force on the bearing capacity, it is expressed as: If the ratio of the axial pressure applied to the main pipe to the yield load of the main pipe is not greater than the second threshold, the bearing capacity influence coefficient ; Otherwise, if the ratio of the axial pressure applied to the main pipe to the yield load of the main pipe is greater than the second threshold, the bearing capacity influence coefficient ; in, is the axial pressure applied to the main pipe, which is an engineering design parameter and is determined by the actual engineering situation. is the yield load of the main pipe, which is obtained by multiplying the cross-sectional area of ​​the main pipe by the yield strength. In this embodiment, the second threshold value here can be set according to the reference value in the Japanese power transmission steel pipe tower manufacturing benchmark.

[0028] S32 obtains the corresponding node influence coefficient according to the influence of the spacing of the parallel plug plates on the node, wherein the spacing of the parallel plug plates is the distance between two parallel plug plates, and the node is the connection point between the two parallel plug plates and the annular stiffening rib.

[0029] In this embodiment, compared with the traditional plug-in plate node, after the single plug-in plate is changed to a parallel plug-in plate, the connection point between the plug-in plate and the annular stiffener is converted into two points. The forces therein may affect each other, resulting in the node bearing capacity not being able to reach twice. Therefore, the node influence coefficient is introduced and calculated. To consider the influence of the spacing between parallel plug plates on the bearing capacity of the node, specifically: ; in, is the main pipe diameter, is the distance between two parallel plug plates, i.e. the spacing, and the parameter is 1.15, which is determined based on a large number of tests and finite element simulation analysis results.

[0030] S33 obtains the node bearing capacity of the main pipe buckling failure mode according to the node influence coefficient and the bearing capacity influence coefficient.

[0031] In this embodiment, when the discrimination coefficient When it is not greater than the first threshold, then: ; When the discriminant coefficient When it is greater than the first threshold, then: ; in, is the design strength of the annular stiffener, in this embodiment, the first threshold here can be set according to the reference value in the Japanese power transmission steel pipe tower manufacturing benchmark. S4 obtains the node bearing capacity of the annular stiffener itself under the buckling condition according to the bearing capacity influence coefficient.

[0032] In this embodiment, the node bearing capacity of the annular stiffener itself under buckling condition is P 2 is expressed as: .

[0033] S5 compares the node bearing capacity of the tube buckling failure mode with the node bearing capacity of the annular stiffener itself under buckling conditions, and takes the smaller value to predict the maximum bending moment value of the node bearing capacity, thereby obtaining the bearing capacity of the steel tube parallel plug plate annular stiffener node; In this embodiment, preferably, the node bearing capacities P1 and P2 calculated in step S3 and step S4 are compared, and the smaller value is taken to calculate the maximum bending moment value of the node bearing capacity, that is, the bearing capacity of the steel tube parallel plug plate annular stiffening rib node is obtained, wherein the maximum bending moment value of the node bearing capacity is It is expressed as: ; Among them, B is the length of the plug plate, that is, the height of the plug plate in the axial direction of the main pipe, that is, the vertical distance between the two annular stiffening ribs.

[0034] In this embodiment, and The smaller value in is for conservative design, making the actual node bearing capacity safer.

[0035] Based on the bearing capacity method of the steel tube parallel plug plate annular stiffening rib node obtained above, this application provides a specific embodiment, which is as follows: This embodiment provides a method for calculating the bearing capacity of a steel tube parallel plate annular stiffening rib node, comprising the following steps: Step (1), assuming that the steel used in the node is an ideal elastic-plastic material, the section of the annular stiffener is set as a simply supported beam with a T-shaped section, and the effective amplitude of the annular stiffener is obtained by the Thurlimann calculation theory formula: , specifically: ; in, is the wall thickness of the main pipe, is the main pipe radius, is the thickness of the annular stiffener; Step (2), introduce and determine the discriminant coefficient , in, is the height of the annular stiffener; Step (3), calculate the node bearing capacity P1 of the main tube buckling failure mode.

[0036] Step (3.1), compared with the traditional plug-in plate node, after the single plug-in plate is changed to a parallel plug-in plate, the connection point between the plug-in plate and the annular stiffener is converted into two points. The forces between them may affect each other, resulting in the node bearing capacity not being able to reach twice, so the node influence coefficient is introduced and calculated To consider the influence of the spacing between parallel plug plates on the bearing capacity of the node, specifically: ; in, is the main pipe diameter, The spacing between the plugboards.

[0037] Step (3.2), calculate the influence coefficient of the main material axial force on the bearing capacity , specifically: When calculating the When the bearing capacity influence coefficient ; When calculating the hour, ; in, is the axial pressure applied to the main pipe, is the yield load of the main pipe, which is obtained by multiplying the cross-sectional area of ​​the main pipe by the yield strength.

[0038] Step (3.3), based on the value of the coefficient K calculated in step (2) and 1.0, the node bearing capacity P1 considering the ratio of the stiffening rib width to the main pipe diameter is calculated according to different formulas according to different situations, specifically: When calculating the When ; When calculating the When ; in, Design strength of the stiffened plate. The meanings of other parameters are the same as in the above steps.

[0039] Step (4) calculates the node bearing capacity P2 considering the buckling of the stiffener itself according to the bearing capacity formula: ; The parameters have the same meaning as in the above steps.

[0040] Step (5), compare the node bearing capacities P1 and P2 calculated in step (3) and step (4), and take the smaller value to calculate the maximum bending moment value of the node bearing capacity, that is: ; in, is the length of the parallel plates.

[0041] On the other hand, this embodiment also provides a bearing capacity calculation system for a steel tube parallel plug plate annular stiffening rib node, the system comprising: The structure determination module is used to determine the structure of the steel pipe parallel plug plate annular stiffening rib node, that is, two parallel plug plates are fixed on the outer periphery of the annular main pipe, and two annular stiffening ribs are arranged in the outer periphery of the main pipe, a certain distance is set between the two annular stiffening ribs, and two parallel plug plates are arranged between the two annular stiffening ribs; An effective amplitude prediction module is used to set the cross section of the annular stiffener as a simply supported beam with a T-shaped cross section, so as to obtain the effective amplitude of the annular stiffener according to the Thurlimann calculation theory formula; A node bearing capacity calculation module for the main buckling failure mode, used to introduce a discriminant coefficient according to the effective amplitude, and obtain a representation of the node bearing capacity of the main buckling failure mode according to the relationship between the discriminant coefficient and the first threshold; A node bearing capacity calculation module for the buckling condition of the annular stiffener itself, used for obtaining the node bearing capacity of the buckling condition of the annular stiffener itself according to the bearing capacity influence coefficient; The maximum bending moment value calculation module of the node bearing capacity is used to compare the node bearing capacity of the tube buckling failure mode with the node bearing capacity of the annular stiffener itself under buckling conditions, and take the smaller value to predict the maximum bending moment value of the node bearing capacity, so as to obtain the bearing capacity of the steel tube parallel plug plate annular stiffener node; The node bearing capacity calculation module for the main buckling failure mode includes: A bearing capacity influence coefficient calculation unit is used to obtain the bearing capacity influence coefficient according to the relationship between the axial pressure applied to the main pipe and the yield load of the main pipe; A node influence coefficient calculation unit, used for obtaining a corresponding node influence coefficient according to the influence of the spacing of the parallel plug plates on the node, wherein the spacing of the parallel plug plates is the distance between the two parallel plug plates, and the node is the connection point between the two parallel plug plates and the annular stiffening rib; The node bearing capacity calculation unit is used to obtain the node bearing capacity of the main pipe buckling failure mode according to the node influence coefficient and the bearing capacity influence coefficient.

[0042] Other technical features of the bearing capacity calculation system of a steel tube parallel plug plate annular stiffening rib node described in this embodiment are similar to the corresponding bearing capacity calculation method of a steel tube parallel plug plate annular stiffening rib node, which will not be repeated here.

[0043] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0044] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0045] Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the embodiments of the present invention. Thus, if these modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A method for calculating the bearing capacity of a steel tube parallel plate annular stiffening rib node, characterized in that: The method includes: Determine the structure of the steel pipe parallel plug plate annular stiffening rib node, that is, two parallel plug plates are fixed on the outer circumference of the annular main pipe, and two annular stiffening ribs are circumferentially arranged on the outer circumference of the main pipe, a certain distance is set between the two annular stiffening ribs, and two parallel plug plates are arranged between the two annular stiffening ribs; The cross section of the annular stiffener is set as a simply supported beam with a T-shaped cross section, and the effective amplitude of the annular stiffener is obtained according to the Thurlimann calculation theory formula; A discriminant coefficient is introduced according to the effective amplitude, and a representation of the node bearing capacity of the main buckling failure mode is obtained according to the relationship between the discriminant coefficient and the first threshold value; The node bearing capacity of the annular stiffener itself under buckling condition is obtained according to the bearing capacity influence coefficient; The node bearing capacity of the tube buckling failure mode is compared with the node bearing capacity of the annular stiffener buckling mode, and the smaller value is taken to predict the maximum bending moment value of the node bearing capacity, so as to obtain the bearing capacity of the steel tube parallel plug plate annular stiffener node; Wherein, the expression form of the node bearing capacity of the main buckling failure mode is obtained according to the relationship between the discrimination coefficient and the first threshold, including: The bearing capacity influence coefficient is obtained based on the relationship between the axial pressure applied to the main pipe and the yield load of the main pipe; According to the influence of the spacing of the parallel plug plates on the nodes, the corresponding node influence coefficient is obtained, wherein the spacing of the parallel plug plates is the distance between the two parallel plug plates, and the node is the connection point between the two parallel plug plates and the annular stiffening rib; The node bearing capacity of the main pipe buckling failure mode is obtained according to the node influence coefficient and the bearing capacity influence coefficient.

2. The method for calculating the bearing capacity of the steel tube parallel plate annular stiffening rib node according to claim 1 is characterized in that: The effective amplitude of the annular stiffener obtained according to the Thurlimann calculation theory formula includes: The effective amplitude of the annular stiffener is obtained by Thurlimann calculation theory formula , expressed as: ; in, is the wall thickness of the main pipe, is the main pipe radius, is the thickness of the annular stiffener.

3. The method for calculating the bearing capacity of the steel tube parallel plate annular stiffening rib node according to claim 2 is characterized in that: The introducing a discrimination coefficient according to the effective amplitude comprises: The discriminant coefficient is expressed as: ;in, is the height of the annular stiffener.

4. The method for calculating the bearing capacity of the steel tube parallel plate annular stiffening rib node according to claim 3 is characterized in that: The bearing capacity influence coefficient is obtained according to the relationship between the axial pressure applied to the main pipe and the yield load of the main pipe, including: If the ratio of the axial pressure applied to the main pipe to the yield load of the main pipe is not greater than the second threshold, the bearing capacity influence coefficient ; Otherwise, if the ratio of the axial pressure applied to the main pipe to the yield load of the main pipe is greater than the second threshold, the bearing capacity influence coefficient ; in, is the axial pressure applied to the main pipe, is the yield load of the main pipe, which is obtained by multiplying the cross-sectional area of ​​the main pipe by the yield strength.

5. The method for calculating the bearing capacity of the steel tube parallel plate annular stiffening rib node according to claim 4 is characterized in that: According to the influence of the spacing of the parallel plug plates on the nodes, the corresponding node influence coefficient is obtained, which is expressed as: ; in, is the diameter of the main pipe, is the distance between two parallel plates.

6. The method for calculating the bearing capacity of the steel tube parallel plate annular stiffening rib node according to claim 5, characterized in that: The step of obtaining the node bearing capacity of the main tube buckling failure mode according to the node influence coefficient and the bearing capacity influence coefficient includes: When the discriminant coefficient When it is not greater than the first threshold, then: ; When the discriminant coefficient When it is greater than the first threshold, then: ;in, is the design strength of the annular stiffener.

7. The method for calculating the bearing capacity of the steel tube parallel plate annular stiffening rib node according to claim 6, characterized in that: The node bearing capacity of the buckling condition of the annular stiffener itself is obtained based on the bearing capacity influence coefficient and is expressed as: ; in, It is the node bearing capacity of the annular stiffener itself under buckling condition.

8. The method for calculating the bearing capacity of the steel tube parallel plate annular stiffening rib node according to claim 7, characterized in that: The smaller value is taken to predict the maximum moment value of the node bearing capacity, so as to obtain the bearing capacity of the steel tube parallel plug plate annular stiffening rib node. The maximum moment value of the node bearing capacity is It is expressed as: ;in, B is the length of the insert plate, that is, the distance between the two annular stiffening ribs in the axial direction of the main pipe.

9. A bearing capacity calculation system for a steel tube parallel plate annular stiffening rib node, characterized in that: The system includes: The structure determination module is used to determine the structure of the steel pipe parallel plug plate annular stiffening rib node, that is, two parallel plug plates are fixed on the outer periphery of the annular main pipe, and two annular stiffening ribs are arranged in the outer periphery of the main pipe, a certain distance is set between the two annular stiffening ribs, and two parallel plug plates are arranged between the two annular stiffening ribs; An effective amplitude prediction module is used to set the cross section of the annular stiffener as a simply supported beam with a T-shaped cross section, so as to obtain the effective amplitude of the annular stiffener according to the Thurlimann calculation theory formula; A node bearing capacity calculation module for the main buckling failure mode, used to introduce a discriminant coefficient according to the effective amplitude, and obtain a representation of the node bearing capacity of the main buckling failure mode according to the relationship between the discriminant coefficient and the first threshold; A node bearing capacity calculation module for the buckling condition of the annular stiffener itself, used for obtaining the node bearing capacity of the buckling condition of the annular stiffener itself according to the bearing capacity influence coefficient; The maximum bending moment value calculation module of the node bearing capacity is used to compare the node bearing capacity of the tube buckling failure mode with the node bearing capacity of the annular stiffener itself under buckling conditions, and take the smaller value to predict the maximum bending moment value of the node bearing capacity, so as to obtain the bearing capacity of the steel tube parallel plug plate annular stiffener node; The node bearing capacity calculation module for the main buckling failure mode includes: A bearing capacity influence coefficient calculation unit is used to obtain the bearing capacity influence coefficient according to the relationship between the axial pressure applied to the main pipe and the yield load of the main pipe; A node influence coefficient calculation unit, used for obtaining a corresponding node influence coefficient according to the influence of the spacing of the parallel plug plates on the node, wherein the spacing of the parallel plug plates is the distance between the two parallel plug plates, and the node is the connection point between the two parallel plug plates and the annular stiffening rib; The node bearing capacity calculation unit is used to obtain the node bearing capacity of the main pipe buckling failure mode according to the node influence coefficient and the bearing capacity influence coefficient.

Images