Calculation method and system for bearing capacity of steel pipe parallel inserted plate circumferential stiffening rib joint

Abstract

The present invention relates to a method and system for calculating the bearing capacity of a steel pipe parallel insert plate circumferential stiffening rib joint, belonging to the technical field of structural engineering. The method first converts the cross-section of the circumferential stiffening plate into a simply supported beam model of a T-shaped cross-section under the assumption of elastic-plasticity of the joint steel, and calculates the bearing capacity of the joint considering the influence of the ratio of the width of the stiffening rib to the diameter of the main pipe according to different formulas P 1. Then, calculate the bearing capacity of the joint considering the buckling of the stiffening rib itself according to the formula P 2. Finally, compare P 1 with P 2 to calculate the maximum bending moment value of the bearing capacity of the joint M max . By comparing the results calculated by the present invention with the test results and finite element calculation results of joints with corresponding dimensional parameters, it is found that it can meet the design requirements of steel pipe joints with parallel insert plates and circumferential stiffening ribs, provide a reliable reference for joint design in practical engineering, and is conducive to the popularization and application of steel pipe parallel insert plate circumferential stiffening rib joints.

Description

Technical Field

[0001] The present invention relates to the technical field of structural engineering, and particularly relates to a method and system for calculating the bearing capacity of a steel pipe parallel plate circumferential stiffening rib joint. Background Technique

[0002] As an important form of steel pipe joint, the steel pipe socket joint has the advantages of flexible size design, easy construction by bolt connection, and easy transportation of components, and is widely used in transmission towers. There are also relatively rich existing studies on its bearing capacity theory.

[0003] With the continuous improvement of power consumption demand, the size and form of transmission towers also need to be improved to enhance the efficiency of transmission lines, and new joint forms also need to be introduced to meet the requirements of structural force transmission optimization and bearing capacity in the actual projects of power transmission and transformation towers in the power industry. There are many bearing capacity calculation methods involved in the prior art, mainly including:

[0004] The invention patents with publication numbers CN101295329A and CN101359344A respectively disclose a method for calculating the bearing capacity of a rectangular steel pipe and a square steel pipe welded spherical joint, and the calculation method includes the bearing capacity calculation method under axial force and the bearing capacity calculation method 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 pipe concrete column - steel beam joint with a floor slab, and specifically gives the calculation method for the shear bearing capacity of the composite steel pipe concrete column - steel beam joint with a floor slab, especially. The invention patent with publication number CN117236092B discloses a method for calculating the bearing capacity of a steel pipe X-shaped stiffened penetrative welded joint, and its new method for calculating the bearing capacity of a steel pipe X-shaped stiffened penetrative welded joint considering the contribution of stiffeners makes the calculation result more consistent with the test situation, and further improves the economy of the design of the steel pipe X-shaped stiffened penetrative welded joint. The invention patent with publication number CN113836658B discloses a method for calculating the compressive design bearing capacity of a Y-shaped cast steel joint, which can solve the problem that the compressive design bearing capacity of a Y-shaped cast steel joint 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 a perforated beam considering internal steel pipe reinforcement, which considers the reinforcement effect of the internal steel pipe on the perforated beam, equivalent the compressive stress flow generated by the internal steel pipe to the compression bar in the STM, and establishes a method for calculating the shear bearing capacity of a perforated beam considering internal steel pipe reinforcement, filling the blank of the calculation method of a perforated beam with internal steel pipe reinforcement based on the strut-and-tie model.

[0005] Therefore, few people have studied the bearing capacity at the steel pipe socket joint. Moreover, the steel pipe parallel socket joint with circumferential stiffeners is a relatively new form of steel pipe socket joint. Through sufficient tests and simulation analyses, it is found that its mechanical properties are significantly different from those of traditional steel pipe socket joints. It is obviously inappropriate to directly calculate the joint bearing capacity according to the existing socket joint design specifications. A reliable calculation method for the bearing capacity of steel pipe parallel socket joints with circumferential stiffeners is needed. Summary of the Invention

[0006] Object of the Invention: To overcome the deficiencies of the above-mentioned prior art, the present invention provides a method for calculating the bearing capacity of a steel pipe parallel socket joint with circumferential stiffeners. This method is proposed for the problem that the application of the traditional calculation method for steel pipe socket joints to the bearing capacity calculation of steel pipe parallel socket joints with circumferential stiffeners is inaccurate. In addition, the present invention also provides a system for calculating the bearing capacity of a steel pipe parallel socket joint with circumferential stiffeners.

[0007] Technical Solution: According to the first aspect of the present invention, there is provided a method for calculating the bearing capacity of a steel pipe parallel socket joint with circumferential stiffeners, which includes:

[0008] Determine the structure of the steel pipe parallel socket joint with circumferential stiffeners, that is, two parallel socket plates are fixed on the outer circumference of the circular main pipe, and two circumferential stiffeners are arranged circumferentially on the outer circumference of the main pipe. There is a certain distance between the two circumferential stiffeners, and the two parallel socket plates are arranged between the two circumferential stiffeners;

[0009] Set the cross-section of the circumferential stiffener as a simply supported beam with a T-shaped cross-section, so as to obtain the effective width of the circumferential stiffener according to the Thurlimann calculation theory formula;

[0010] Introduce a discrimination coefficient according to the effective width, and obtain the expression of the joint bearing capacity in the main pipe buckling failure mode according to the relationship between the discrimination coefficient and the first threshold;

[0011] Obtain the joint bearing capacity of the circumferential stiffener itself buckling situation according to the bearing capacity influence coefficient;

[0012] Compare the joint bearing capacity in the pipe buckling failure mode with the joint bearing capacity of the circumferential stiffener itself buckling situation, and take the smaller value to predict the maximum bending moment value of the joint bearing capacity, so as to obtain the bearing capacity of the steel pipe parallel socket joint with circumferential stiffeners;

[0013] Among them, the obtaining the expression of the joint bearing capacity in the main pipe buckling failure mode according to the relationship between the discrimination coefficient and the first threshold includes:

[0014] 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;

[0015] According to the influence of the spacing of parallel gusset plates on the joints, the corresponding joint influence coefficients are obtained. The spacing of the parallel gusset plates is the distance between two parallel gusset plates, and the joints are the connection points of two parallel gusset plates and the circular stiffeners.

[0016] Based on the joint influence coefficients and the bearing capacity influence coefficients, the joint bearing capacity of the main pipe buckling failure mode is obtained.

[0017] Furthermore, it includes:

[0018] The effective amplitude of the circular stiffener obtained according to the Thurlimann calculation theory formula includes:

[0019] The effective amplitude of the circular stiffener is obtained from the Thurlimann calculation theory formula , expressed as: ; where is the wall thickness of the main pipe, is the radius of the main pipe, is the thickness of the circular stiffener.

[0020] Furthermore, it includes:

[0021] The discrimination coefficient introduced according to the effective amplitude includes: The discrimination coefficient is expressed as: ; where is the height of the circular stiffener.

[0022] Furthermore, it includes:

[0023] The bearing capacity influence coefficient obtained according to the relationship between the axial pressure applied to the main pipe and the yield load of the main pipe includes:

[0024] 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, then 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, then the bearing capacity influence coefficient ;

[0025] Where 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.

[0026] Furthermore, it includes:

[0027] The corresponding joint influence coefficients are obtained according to the influence of the spacing of parallel gusset plates on the joints, expressed as: ; where is the diameter of the main pipe, is the distance between two parallel splices.

[0028] Further, it includes:

[0029] The nodal bearing capacity obtained based on the nodal influence coefficient and the bearing capacity influence coefficient to obtain the buckling failure mode of the main pipe includes:

[0030] When the discrimination coefficient is not greater than the first threshold, then: ;

[0031] When the discrimination coefficient is greater than the first threshold, then: ; where is the design strength of the circumferential stiffener.

[0032] Further, it includes: the nodal bearing capacity of the circumferential stiffener itself buckling obtained based on the bearing capacity influence coefficient , expressed as: .

[0033] Further, it includes:

[0034] Taking the smaller value to predict the maximum bending moment value of the nodal bearing capacity, so as to obtain the bearing capacity of the steel pipe parallel splice circumferential stiffener joint, and the maximum bending moment value of the nodal bearing capacity is expressed as: ;

[0035] where B is the length of the splice, that is, the distance between two circumferential stiffeners in the axial direction of the main pipe.

[0036] On the other hand, the present invention also provides a bearing capacity calculation system for a steel pipe parallel splice circumferential stiffener joint, and this system includes:

[0037] A structure determination module, used to determine the structure of the steel pipe parallel splice circumferential stiffener joint, that is, two parallel splices are fixed on the outer circumference of the circular main pipe, and two circumferential stiffeners are arranged circumferentially on the outer circumference of the main pipe, there is a certain distance between the two circumferential stiffeners, and two parallel splices are arranged between the two circumferential stiffeners;

[0038] An effective amplitude prediction module, used to set the cross-section of the circumferential stiffener as a simply supported beam with a T-shaped cross-section, so as to obtain the effective amplitude of the circumferential stiffener according to Thurlimann the calculation theoretical formula;

[0039] A nodal bearing capacity calculation module for the buckling failure mode of the main pipe, used to introduce a discrimination coefficient according to the effective amplitude, and obtain the representation form of the nodal bearing capacity of the buckling failure mode of the main pipe according to the relationship between the discrimination coefficient and the first threshold;

[0040] The node bearing capacity calculation module for the buckling of the circumferential stiffener itself is used to obtain the node bearing capacity of the circumferential stiffener itself according to the bearing capacity influence coefficient;

[0041] The node bearing capacity maximum bending moment value calculation module is used to compare the node bearing capacity of the pipe buckling failure mode and the node bearing capacity of the circumferential stiffener itself, 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 pipe parallel plate circumferential stiffener node;

[0042] Among them, the node bearing capacity calculation module for the main pipe buckling failure mode includes:

[0043] The 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;

[0044] The node influence coefficient calculation unit is used to obtain the corresponding node influence coefficient according to the influence of the spacing of the parallel plates on the node. The spacing of the parallel plates is the distance between two parallel plates, and the node is the connection point of two parallel plates and the annular stiffener;

[0045] 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.

[0046] Advantageous effects: Compared with the prior art, the present invention has the following advantages:

[0047] The present invention first proposes a bearing capacity calculation method for the steel pipe parallel plate circumferential stiffener node. This method considers the node bearing capacity of the main pipe buckling failure mode and the node bearing capacity of the circumferential stiffener itself, and determines the final maximum bending moment value of the node bearing capacity according to the magnitudes of the two bearing capacities; and the node bearing capacity of the main pipe buckling failure mode considers the influence of various factors, such as the influence of the main material axial force on the bearing capacity and the influence of the parallel plate spacing on the node bearing capacity, and it is obtained by using different calculation methods according to the relationship between the calculation coefficient and the threshold; the node bearing capacity of the circumferential stiffener itself is obtained according to various parameters; finally, the results calculated by the present invention are compared and verified with the test results and finite element calculation results of the nodes with corresponding dimensional parameters, and it is found that it can meet the design requirements of the steel pipe nodes with parallel plates and circumferential stiffeners, provide a reliable reference for the node design in practical engineering, and is beneficial to the popularization and application of the steel pipe parallel plate circumferential stiffener nodes. Description of the Drawings

[0048] Figure 1 It is a flowchart of the bearing capacity calculation method for the steel pipe parallel plate circumferential stiffener node described in the embodiment of the present invention;

[0049] Figure 2 Flow chart of the calculation method for the joint bearing capacity of the main pipe buckling failure mode according to the embodiment of the present invention;

[0050] Figure 3 Top view of the base steel pipe parallel inserted plate circumferential stiffener joint structure according to the embodiment of the present invention;

[0051] Figure 4 Front view of the base steel pipe parallel inserted plate circumferential stiffener joint structure according to the embodiment of the present invention;

[0052] Figure 5 Internal sectional view of the base steel pipe parallel inserted plate circumferential stiffener joint according to the embodiment of the present invention;

[0053] Figure 6 Schematic diagram of the circumferential stiffener section conversion T-section simply supported beam model according to the embodiment of the present invention;

[0054] Among them, the attachment Figure 3-6 includes: inserted plate 1, main pipe 2, circumferential stiffener 3. Specific implementation mode

[0055] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a 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 those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0056] In the first aspect of the present invention, a calculation method for the bearing capacity of a steel pipe parallel inserted plate circumferential stiffener joint is provided. This method is calculated according to the following joint bearing capacity formula obtained by analyzing the test and finite element analysis results. As Figure 1 shown, this method includes the following steps:

[0057] S1 Determine the structure of the steel pipe parallel inserted plate circumferential stiffener joint. As Figure 3 shown, the inserted plate 1 of this structure is radially inserted into the circular main pipe 2. The inserted plate 1 includes at least two inserted plates parallel to the axial direction of the main pipe 2, that is, these two inserted plates 1 are respectively installed on the outer periphery of the main pipe 2. The installation method can be welding, and the specific shape of the inserted plate 1 is not limited in this embodiment, as long as the width and height can be measured and there are two sides parallel to the axial direction of the main pipe 2.

[0058] In this embodiment, two circumferential stiffeners 3 with a certain height and thickness are circumferentially arranged on the outer periphery of the main pipe 2, and is the height of the circumferential stiffener 3. The two parallel inserted plates 1 are located between the two circumferential stiffeners 3.

[0059] As shown Figure 4 in the figure, T is the wall thickness of the main pipe 2, D is the diameter of the main pipe 2. As Figure 5 shown in the figure, B is the length of the insertion plate 1, that is, the height of the insertion plate in the axial direction of the main pipe, which is also the vertical distance between two circumferential stiffeners 3. is the thickness of the circumferential stiffener 3. is the distance between two parallel insertion plates 1.

[0060] S2 sets the cross-section of the circumferential stiffener as a simply supported beam with a T-shaped cross-section, so as to obtain the effective amplitude of the circumferential stiffener according to the Thurlimann calculation theoretical formula.

[0061] In this embodiment, Figure 6 as shown is the radius of the main pipe 2, and the effective amplitude of the circumferential stiffener can be obtained according to the Thurlimann calculation theoretical formula, which is expressed as: ; where is the wall thickness of the main pipe 2, is the radius of the main pipe 2, is the thickness of the circumferential stiffener 3.

[0062] S3 introduces a discrimination coefficient according to the effective amplitude, and obtains the expression form of the node bearing capacity of the main pipe buckling failure mode according to the relationship between the discrimination coefficient and the first threshold.

[0063] In the Japanese production standard for transmission steel pipe towers, there are regulations on the calculation of the node bearing capacity of traditional single-insertion plates, which involves a calculation coefficient. In this embodiment, in order to calculate the node bearing capacity of the main pipe buckling failure mode, the discrimination coefficient K is used as an intermediate parameter.

[0064] Preferably, introducing the discrimination coefficient according to the effective amplitude includes: the discrimination coefficient is expressed as: ;

[0065] where is the height of the circumferential stiffener.

[0066] 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 pipe buckling failure mode is obtained, as Figure 2 shown, including: S31 obtains 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.

[0067] Specifically, the bearing capacity influence coefficient is the influence coefficient of the calculated main member axial force on the bearing capacity, which is expressed as:

[0068] 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, then the bearing capacity influence coefficient ;

[0069] 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, then the bearing capacity influence coefficient ;

[0070] Among them, 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 here can be set according to the reference value in the Japanese production standard for transmission steel pipe towers.

[0071] S32 Obtain the corresponding node influence coefficient according to the influence of the spacing of the parallel splices on the node. The spacing of the parallel splices is the distance between two parallel splices, and the node is the connection point of two parallel splices and the ring stiffener.

[0072] In this embodiment, compared with the traditional splice node, after the single splice becomes a parallel splice, the connection points of the splice and the ring stiffener are converted into two points, and their forces may affect each other, resulting in the node bearing capacity not reaching twice. Therefore, the node influence coefficient is introduced and calculated to consider the influence of the parallel splice spacing on the node bearing capacity. Specifically: ;

[0073] Among them, is the main pipe diameter, is the distance between two parallel splices, that is, the spacing. For the parameter 1.15, this parameter is determined based on a large number of tests and finite element simulation analysis results.

[0074] S33 Obtain the node bearing capacity of the main pipe buckling failure mode based on the node influence coefficient and the bearing capacity influence coefficient.

[0075] In this embodiment, when the discrimination coefficient is not greater than the first threshold, then: ;

[0076] When the discrimination coefficient is greater than the first threshold, then: ;

[0077] Among them, For the design strength of the circumferential stiffener, in this embodiment, the first threshold here can be set according to the reference value in the manufacturing standard of Japanese transmission steel pipe towers. S4 Obtain the joint bearing capacity of the circumferential stiffener itself in the buckling situation based on the bearing capacity influence coefficient.

[0078] In this embodiment, the joint bearing capacity of the circumferential stiffener itself in the buckling situation P is expressed as: .

[0079] S5 Compare the joint bearing capacity of the tube buckling failure mode with the joint bearing capacity of the circumferential stiffener itself in the buckling situation, and take the smaller value to predict the maximum bending moment value of the joint bearing capacity, so as to obtain the bearing capacity of the steel pipe parallel plate circumferential stiffener joint;

[0080] In this embodiment, preferably, compare the sizes of the joint bearing capacities P1 and P2 calculated in steps S3 and S4, and take the smaller value to calculate the maximum bending moment value of the joint bearing capacity, that is, obtain the bearing capacity of the steel pipe parallel plate circumferential stiffener joint, where the maximum bending moment value of the joint bearing capacity is expressed as: ; where B is the length of the insert plate, that is, the height of the insert plate in the axial direction of the main pipe, that is, the vertical distance between two circumferential stiffeners.

[0081] In this embodiment, taking and the smaller value is for conservative design to make the actual joint bearing capacity on the safe side.

[0082] Based on the above method for obtaining the bearing capacity of the steel pipe parallel plate circumferential stiffener joint, this application provides a specific embodiment, as follows:

[0083] This embodiment provides a method for calculating the bearing capacity of a steel pipe parallel plate circumferential stiffener joint, including the following steps:

[0084] Step (1), assume that the steel used for the joint is an ideal elastoplastic material, set the cross-section of the circumferential stiffener as a simply supported beam with a T-shaped cross-section, and obtain the effective width of the circumferential stiffener from the Thurlimann calculation theory formula , specifically: ;

[0085] where is the wall thickness of the main pipe, is the radius of the main pipe, is the thickness of the circumferential stiffener;

[0086] Step (2), introduce and discriminate the coefficient , where is the height of the circumferential stiffener;

[0087] Step (3), calculate the nodal bearing capacity P1 of the main pipe buckling failure mode.

[0088] Step (3.1), compared with the traditional socket joint, after the single socket plate becomes a parallel socket plate, the connection points between the socket plate and the annular stiffener are converted into two points, and the forces on them may interact with each other, resulting in the nodal bearing capacity not reaching twice. Therefore, introduce and calculate the nodal influence coefficient to consider the influence of the parallel socket plate spacing on the nodal bearing capacity, specifically: ;

[0089] where, is the main pipe diameter, is the socket plate spacing.

[0090] Step (3.2), calculate the influence coefficient of the main member axial force on the bearing capacity , specifically:

[0091] When the calculation determines , the bearing capacity influence coefficient ;

[0092] When the calculation determines , ;

[0093] where, is the axial pressure applied to the main pipe, is the yield load of the main pipe, obtained by multiplying the cross-sectional area of the main pipe by the yield strength.

[0094] Step (3.3), based on the comparison of the value of the calculation coefficient K in step (2) with 1.0, calculate the nodal bearing capacity P1 considering the influence of the ratio of the stiffener width to the main pipe diameter according to different situations using different formulas, specifically:

[0095] When the calculation determines , then ;

[0096] When the calculation determines , then ;

[0097] where, is the design strength of the stiffening plate, and the meanings of the other parameters are the same as those in the above steps.

[0098] Step (4), calculate the nodal bearing capacity P2 considering the buckling of the stiffener itself according to the bearing capacity formula: ;

[0099] where, the meanings of the parameters are the same as those in the above steps.

[0100] Step (5): Compare the magnitudes of the joint bearing capacities P1 and P2 calculated in steps (3) and (4), and take the smaller value for calculating the maximum bending moment value of the joint bearing capacity, i.e.: ;

[0101] wherein, is the length of the parallel inserted plates.

[0102] On the other hand, the present embodiment also provides a bearing capacity calculation system for a steel pipe parallel inserted plate circumferential stiffener joint, and the system includes:

[0103] A structure determination module, configured to determine the structure of the steel pipe parallel inserted plate circumferential stiffener joint, that is, two parallel inserted plates are fixed on the outer periphery of the circular main pipe, and two circumferential stiffeners are arranged circumferentially on the outer periphery of the main pipe, there is a certain distance between the two circumferential stiffeners, and the two parallel inserted plates are arranged between the two circumferential stiffeners;

[0104] An effective amplitude prediction module, configured to set the cross-section of the circumferential stiffener as a simply supported beam with a T-shaped cross-section, so as to obtain the effective amplitude of the circumferential stiffener according to the Thurlimann calculation theory formula;

[0105] A joint bearing capacity calculation module for the main pipe buckling failure mode, configured to introduce a discrimination coefficient according to the effective amplitude, and obtain the expression form of the joint bearing capacity in the main pipe buckling failure mode according to the relationship between the discrimination coefficient and the first threshold;

[0106] A joint bearing capacity calculation module for the circumferential stiffener itself buckling condition, configured to obtain the joint bearing capacity of the circumferential stiffener itself buckling condition according to the bearing capacity influence coefficient;

[0107] A joint bearing capacity maximum bending moment value calculation module, configured to compare the joint bearing capacity in the pipe buckling failure mode and the joint bearing capacity of the circumferential stiffener itself buckling condition, take the smaller value for predicting the joint bearing capacity maximum bending moment value, so as to obtain the bearing capacity of the steel pipe parallel inserted plate circumferential stiffener joint;

[0108] Among them, the joint bearing capacity calculation module for the main pipe buckling failure mode includes:

[0109] A bearing capacity influence coefficient calculation unit, configured 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;

[0110] A joint influence coefficient calculation unit, configured to obtain the corresponding joint influence coefficient according to the influence of the spacing of the parallel inserted plates on the joint, the spacing of the parallel inserted plates is the distance between the two parallel inserted plates, and the joint is the connection point of the two parallel inserted plates and the circumferential stiffener;

[0111] A node bearing capacity calculation unit is used to obtain the node bearing capacity of the main pipe buckling failure mode based on the node influence coefficient and the bearing capacity influence coefficient.

[0112] Other technical features of the bearing capacity calculation system of the steel pipe parallel socket ring stiffener node described in this embodiment are similar to those of the corresponding bearing capacity calculation method of the steel pipe parallel socket ring stiffener node, and will not be elaborated here.

[0113] Those skilled in the art should understand that the embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present invention can 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.

[0114] Although the preferred embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications to these embodiments once they know the basic creative concept. Therefore, the appended claims are intended to be construed as including the preferred embodiments and all changes and modifications falling within the scope of the present invention.

[0115] 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 equivalent technologies, the present invention also intends to include these modifications and variations.

Claims

1. A method for calculating the bearing capacity of a steel pipe parallel inserted plate circumferential stiffener joint, characterized in that The method includes: Determining the structure of the steel pipe parallel plate circumferential stiffener joint, that is, two parallel plates are fixed on the outer periphery of the circular main pipe, and two circumferential stiffeners are arranged circumferentially on the outer periphery of the main pipe, a certain distance is set between the two circumferential stiffeners, and the two parallel plates are arranged between the two circumferential stiffeners; Setting the cross-section of the circumferential stiffener as a simply supported beam with a T-shaped cross-section, and obtaining the effective width of the circumferential stiffener according to the Thurlimann calculation theory formula; Introducing a discrimination coefficient according to the effective width, and obtaining the expression form of the joint bearing capacity in the main pipe buckling failure mode according to the relationship between the discrimination coefficient and the first threshold; Obtaining the joint bearing capacity of the circumferential stiffener itself buckling condition according to the bearing capacity influence coefficient; Comparing the joint bearing capacity in the pipe buckling failure mode and the joint bearing capacity of the circumferential stiffener itself buckling condition, taking the smaller value to predict the maximum bending moment value of the joint bearing capacity, so as to obtain the bearing capacity of the steel pipe parallel plate circumferential stiffener joint; Among them, obtaining the expression form of the joint bearing capacity in the main pipe buckling failure mode according to the relationship between the discrimination coefficient and the first threshold includes: 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; Obtaining the corresponding joint influence coefficient according to the influence of the spacing of the parallel plates on the joint, the spacing of the parallel plates is the distance between the two parallel plates, and the joint is the connection point of the two parallel plates and the circumferential stiffener; Obtaining the joint bearing capacity in the main pipe buckling failure mode according to the joint influence coefficient and the bearing capacity influence coefficient.

2. The bearing capacity calculation method of the steel pipe parallel gusset ring stiffener joint according to claim 1, characterized in that Setting the cross-section of the circumferential stiffener as a simply supported beam with a T-shaped cross-section and obtaining the effective width of the circumferential stiffener according to the Thurlimann calculation theory formula includes: The effective amplitude of the circumferential stiffener is obtained from Thurlimann's computational theory formula , expressed as: ; Among them, is the wall thickness of the main pipe, is the radius of the main pipe, is the thickness of the circumferential stiffening rib.

3. The bearing capacity calculation method of the steel pipe parallel plug plate circumferential stiffener joint according to claim 2, characterized in that Introducing a discrimination coefficient according to the effective width includes: The discrimination coefficient is expressed as: ; where is the height of the circumferential stiffener.

4. The bearing capacity calculation method of the steel pipe parallel plug-in plate circumferential stiffening rib joint according to claim 3, characterized in that, 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 includes: 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 value, then 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 value, then the bearing capacity influence coefficient ; Among them, 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 bearing capacity calculation method of the steel pipe parallel inserted plate circumferential stiffening rib joint according to claim 4, characterized in that, According to the influence of the spacing of the parallel plates on the nodes, the corresponding node influence coefficient is obtained, which is expressed as: ; Among them, is the diameter of the main pipe, is the distance between two parallel insertion plates.

6. The bearing capacity calculation method of the steel pipe parallel inserted plate circumferential stiffening rib joint according to claim 5, characterized in that Obtaining the joint bearing capacity in the main pipe buckling failure mode according to the joint influence coefficient and the bearing capacity influence coefficient includes: When the discrimination coefficient is not greater than the first threshold, then: ; When the discrimination coefficient is greater than the first threshold, then: ; where is the design strength of the circumferential stiffener.

7. The bearing capacity calculation method of the steel pipe parallel inserted plate circumferential stiffening rib joint according to claim 6, characterized in that, The joint bearing capacity obtained based on the bearing capacity influence coefficient for the buckling condition of the circumferential stiffener itself is expressed as: ; Among them, is the nodal bearing capacity of the circumferential stiffener itself in the case of buckling.

8. The bearing capacity calculation method of the steel pipe parallel splice ring stiffener joint according to claim 7, characterized in that, 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 pipe parallel inserted plate circumferential stiffener node, and the maximum bending moment value of the node bearing capacity is expressed as: ; where B is the length of the inserted plate, that is, the distance between two circumferential stiffeners in the axial direction of the main pipe.

9. A bearing capacity calculation system for a steel pipe parallel plug plate circumferential stiffening rib joint, characterized in that, The system includes: A structure determination module for determining the structure of the steel pipe parallel plate circumferential stiffener joint, that is, two parallel plates are fixed on the outer periphery of the circular main pipe, and two circumferential stiffeners are arranged circumferentially on the outer periphery of the main pipe, a certain distance is set between the two circumferential stiffeners, and the two parallel plates are arranged between the two circumferential stiffeners; An effective width prediction module for setting the cross-section of the circumferential stiffener as a simply supported beam with a T-shaped cross-section, so as to obtain the effective width of the circumferential stiffener according to the Thurlimann calculation theory formula; A joint bearing capacity calculation module for the main pipe buckling failure mode, which is used to introduce a discrimination coefficient according to the effective width, and obtain the expression form of the joint bearing capacity in the main pipe buckling failure mode according to the relationship between the discrimination coefficient and the first threshold; A joint bearing capacity calculation module for the circumferential stiffener itself buckling condition, which is used to obtain the joint bearing capacity of the circumferential stiffener itself buckling condition according to the bearing capacity influence coefficient; The maximum bending moment value calculation module of the joint bearing capacity is used to compare the joint bearing capacity of the pipe buckling failure mode with the joint bearing capacity of the circumferential stiffener itself buckling situation, and take the smaller value to predict the maximum bending moment value of the joint bearing capacity, so as to obtain the bearing capacity of the steel pipe parallel inserted plate circumferential stiffener joint; Among them, the joint bearing capacity calculation module of the main pipe buckling failure mode includes: The 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; The joint influence coefficient calculation unit is used to obtain the corresponding joint influence coefficient according to the influence of the spacing of the parallel inserted plates on the joint. The spacing of the parallel inserted plates is the distance between two parallel inserted plates, and the joint is the connection point of two parallel inserted plates and the circumferential stiffener; The joint bearing capacity calculation unit is used to obtain the joint bearing capacity of the main pipe buckling failure mode based on the joint influence coefficient and the bearing capacity influence coefficient.

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