CN117236092A - Method for calculating bearing capacity of X-shaped stiffening intersecting welding joint of steel pipe - Google Patents
Method for calculating bearing capacity of X-shaped stiffening intersecting welding joint of steel pipe Download PDFInfo
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- CN117236092A CN117236092A CN202310622285.1A CN202310622285A CN117236092A CN 117236092 A CN117236092 A CN 117236092A CN 202310622285 A CN202310622285 A CN 202310622285A CN 117236092 A CN117236092 A CN 117236092A
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Abstract
The invention discloses a method for calculating the bearing capacity of a steel pipe X-shaped stiffening intersecting welding node, and relates to the field of structural calculation of electric power technology and constructional engineering. It comprises the following steps: step 1: calculating an intermediate parameter psi n; step 2: calculating the pipe diameter ratio beta of the branch pipe and the main pipe; step 3: calculating a non-stiffened node partial contribution N cX And a non-stiffened node portion contribution N tX The method comprises the steps of carrying out a first treatment on the surface of the Step 4: calculating a node plate portion contribution N cXP And node plate portion contribution N tXP The method comprises the steps of carrying out a first treatment on the surface of the Step 5: calculating the contribution term N of the ring plate part cXR And the contribution of the ring plate part N tXR The method comprises the steps of carrying out a first treatment on the surface of the Step 6, calculating the bearing capacity N of the X-shaped stiffening intersecting welding node cXPR And X-shaped stiffening intersecting weldingNode bearing capacity N tXPR . The invention provides a method for calculating the bearing capacity of a steel pipe X-shaped stiffening intersecting welding joint by considering the contribution of stiffening plates and annular plates for the first time, and comprehensively considers the influences of the sizes and the degrees of a main pipe, a branch pipe, the stiffening plates and the annular plates and the arrangement of the annular plates so as to obtain the bearing capacity of the joint of a pressed branch pipe and a tension branch pipe.
Description
Technical Field
The invention relates to the field of structural calculation of electric power technology and constructional engineering, in particular to a method for calculating the bearing capacity of a stiffening intersecting welding node of a steel pipe X-shaped.
Background
The steel pipe member has excellent structural performance and attractive appearance, and the steel pipe truss structure formed by direct welding is widely applied to the structural fields of electric power, buildings, oceans, machinery and the like; the X-shaped intersecting node is an important connection form of the structure of the steel pipe tower of the power transmission line, and the actual engineering often needs to locally strengthen the node part so as to improve the bearing capacity and the rigidity of the node; however, in the design standards at home and abroad, the method for calculating the bearing capacity of the X-shaped stiffening tubular node is not perfect.
Currently, china's steel structure design Standard (GB 50017-2017), ' U.S. steel structure building design Specification (ANSI/AISC 360-10), ' European Specification 3: steel structural design-parts 1-8: the node design (EN 1993-1-8) and the recommended method for planning, designing and constructing an offshore fixed platform-working stress design method (22 nd edition) and the like are used for making detailed regulations on the bearing capacity calculation method of the X-shaped non-stiffening steel pipe intersecting welding node and providing a practical calculation formula; although the methods are different from each other in formulation, the methods are relatively mature, and are verified by related tests and simulation analysis, and are widely adopted in engineering design at present; however, the method for calculating the bearing capacity of the stiffening intersecting welding node does not have a systematic design method at present.
Through experiments, after the stiffening plate is arranged, the bearing capacity of the intersecting welding node is obviously improved, if the bearing capacity of the section is reasonably considered during design, the design of the steel pipe node is more economical and reasonable, so that a brand new method for calculating the bearing capacity of the stiffening intersecting welding node of the X-shaped steel pipe taking the stiffening contribution into consideration is urgently required to be researched and provided, the calculation result is more consistent with the experimental condition, and the economy of the design of the stiffening intersecting welding node of the X-shaped steel pipe is further improved.
Therefore, the method for calculating the bearing capacity of the X-shaped stiffening penetration welding node of the steel pipe is necessary to consider the contribution of the annular plate to the bearing capacity of the node, and simultaneously calculate the bearing capacity of the X-shaped stiffening penetration welding node of the steel pipe under the condition of larger support pipe diameter thickness based on extensive tests and numerical simulation.
Disclosure of Invention
The invention aims to overcome the defects of the background technology, and provides a method for calculating the bearing capacity of a stiffening intersecting welding node of a steel pipe X-shaped.
In order to achieve the first object, the technical scheme of the invention is as follows: the method for calculating the bearing capacity of the X-shaped stiffening intersecting welding node of the steel pipe is characterized by comprising the following steps of:
step 1: step 1: determining the smaller stress sigma of the main pipe at two sides of the node and the yield strength f of the main pipe steel y Calculating to obtain an intermediate parameter psi n ：
Wherein σ is a small value of compressive stress of the two sides of the node, and when the two sides or one side of the node is in tension, σ=0;
step 2: determining the diameter D of the branch pipe and the diameter D of the main pipe, and calculating the pipe diameter ratio beta of the branch pipe to the main pipe:
beta=d/D (formula 2)
Step 3: based on the included angle theta between the branch pipe and the main pipe, the thickness T of the main pipe and the intermediate parameter psi n Main pipe steel strength design value f m Calculating to obtain a non-stiffening node contribution item N of the bearing capacity of the X-shaped stiffening intersecting welding node when the branch pipe is pressed cX And a non-stiffening node part contribution item N of X-shaped stiffening intersecting welding node bearing capacity when the branch pipe is pulled tX ：
The branch pipe is pressed:
the branch pipe is pulled:
step 4: effective length l of node plate based on main pipe diameter D p Design value f of strength of steel material of gusset plate p Main pipe thickness T, pressure branch pipe and main pipe angle θ, intermediate parameter ψ n Calculating to obtain a node plate part contribution item N of the X-shaped stiffening penetration welding node bearing capacity when the branch pipe is pressed cXP And the contribution item N of the node plate part with stiffening intersecting welding node bearing capacity of X shape when the branch pipe is pulled tXP ：
Pressurized branch pipe:
tension branch pipe:
step 5: based on the diameter D of the main pipe, the thickness T of the main pipe and the thickness T of the annular plate r Height h of ring plate r Calculating to obtain an annular plate part contribution item N of the X-shaped stiffening penetration welding node bearing capacity when the branch pipe is pressed cXR And the contribution item N of the annular plate part with stiffening intersecting welding node bearing capacity of X shape when the branch pipe is pulled tXR ：
Pressurized branch pipe:
tension branch pipe:
in the formula 7 and the formula 8, the alpha value is radian;
step 6, based on the non-stiffening node part contribution item, the node plate part contribution item and the ring plate part contribution item of the X-shaped stiffening intersecting welding node bearing capacity, respectively calculating to obtain the X-shaped stiffening intersecting welding node bearing capacity N of the branch pipe under pressure cXPR Bearing capacity N of X-shaped stiffening intersecting welding joint for tension of branch pipe tXPR ：
Pressurized branch pipe: n (N) cXPR ＝N cX +N cXP +N cXR (equation 9)
Tension branch pipe: n (N) tXPR ＝N tX +N tXP +N tXR (equation 10).
In the above technical solution, in step 5, when the ring plate is a full ring, α=1.1pi is taken; when the annular plate is a 1/4 ring and a half ring, alpha is the radian of the annular plate; when the two side ring plates are semi-rings and can be fully replaced, the full ring is made, and the bearing capacity is considered according to the full ring; when (when)At the time, take
Compared with the prior art, the invention has the following advantages:
1) The invention provides a method for calculating the bearing capacity of a joint of a stiffening and intersecting welding of a steel pipe X shape taking the contribution of a stiffening plate and a ring plate into consideration for the first time, comprehensively taking the influences of the sizes, the strengths and the ring plate arrangements of a main pipe, a branch pipe, the stiffening plate and the ring plate into consideration so as to obtain the bearing capacities of the joint of a pressed branch pipe and a tension branch pipe; because the X-shaped steel pipe has a plurality of parameters which need to be considered in the calculation of the bearing capacity of the stiffening intersecting welding nodes, the bearing capacity calculation method is obtained by adopting finite element numerical simulation to carry out parameterization analysis on the basis of test and theoretical analysis and fitting based on the data.
2) The X-shaped stiffening intersecting welding node of the steel pipe obtained by the calculation method has high safety performance and low engineering cost; the invention can be widely applied to the design of the stiffening intersecting welding nodes of the X-shaped steel pipe of the power transmission line.
3) Compared with the existing specifications and documents, the calculation method can consider the contribution of the node plates and the ring plates to the node bearing capacity, and can accurately calculate the bearing capacity based on extensive tests and numerical simulation.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic structural view of the ring plate when the ring plate is a full ring plate.
Fig. 3 is a schematic structural view of the ring plate when it is a half ring plate.
FIG. 4 is a schematic view of the structure when the ring plate is a 1/4 ring plate.
Detailed Description
The following detailed description of the invention is, therefore, not to be taken in a limiting sense, but is made merely by way of example. While the advantages of the invention will become apparent and readily appreciated by reference to the following description.
As can be seen with reference to the accompanying drawings: the method for calculating the bearing capacity of the X-shaped stiffening intersecting welding node of the steel pipe is characterized by comprising the following steps of:
step 1: step 1: determining the smaller stress sigma of the main pipe at two sides of the node and the yield strength f of the main pipe steel y Calculating to obtain an intermediate parameter psi n ：
Wherein σ is a small value of compressive stress of the two sides of the node, and when the two sides or one side of the node is in tension, σ=0;
step 2: determining the diameter D of the branch pipe and the diameter D of the main pipe, and calculating the pipe diameter ratio beta of the branch pipe to the main pipe:
beta=d/D (formula 2)
Step 3: based on the included angle theta between the branch pipe and the main pipe, the thickness T of the main pipe and the intermediate parameter psi n Main pipe steel strength design value f m Calculating to obtain a non-stiffening node contribution item N of the bearing capacity of the X-shaped stiffening intersecting welding node when the branch pipe is pressed cX And a non-stiffening node part contribution item N of X-shaped stiffening intersecting welding node bearing capacity when the branch pipe is pulled tX ：
The branch pipe is pressed:
the branch pipe is pulled:
step 4: effective length l of node plate based on main pipe diameter D p Design value f of strength of steel material of gusset plate p Main pipe thickness T, pressure branch pipe and main pipe angle θ, intermediate parameter ψ n Calculating to obtain a node plate part contribution item N of the X-shaped stiffening penetration welding node bearing capacity when the branch pipe is pressed cXP And the contribution item N of the node plate part with stiffening intersecting welding node bearing capacity of X shape when the branch pipe is pulled tXP ：
Pressurized branch pipe:
tension branch pipe:
step 5: based on the diameter D of the main pipe, the thickness T of the main pipe and the thickness T of the annular plate r Height h of ring plate r Calculating to obtain an annular plate part contribution item N of the X-shaped stiffening penetration welding node bearing capacity when the branch pipe is pressed cXR And the contribution item N of the annular plate part with stiffening intersecting welding node bearing capacity of X shape when the branch pipe is pulled tXR ：
Pressurized branch pipe:
tension branch pipe:
in the formula 7 and the formula 8, the alpha value is radian;
step 6, based on the non-stiffening node part contribution item, the node plate part contribution item and the ring plate part contribution item of the X-shaped stiffening intersecting welding node bearing capacity, respectively calculating to obtain the X-shaped stiffening intersecting welding node bearing capacity N of the branch pipe under pressure cXPR Bearing capacity N of X-shaped stiffening intersecting welding joint for tension of branch pipe tXPR ：
Pressurized branch pipe: n (N) cXPR ＝N cX +N cXP +N cXR (equation 9)
Tension branch pipe: n (N) tXPR ＝N tX +N tXP +N tXR (equation 10).
In the step 5, when the ring plate is a full ring, α=1.1pi is taken; when the annular plate is a 1/4 ring and a half ring, alpha is the radian of the annular plate; when the two side ring plates are semi-rings and can be fully replaced, the full ring is made, and the bearing capacity is considered according to the full ring; when (when)At the time, take
Examples
Taking a typical X-shaped stiffening intersecting welding node as an example, the basic dimension parameters are as follows:
the diameter D of the main pipe is 406mm; the thickness T of the main pipe is 8mm; the diameter d of the branch pipe is 219mm; the thickness t of the branch pipe is 6mm; the included angle theta between the branch pipe and the main pipe is 70 degrees; effective length l of node plate p 200mm; thickness t of gusset plate p 8mm; by using full ring plate, height h of ring plate r 60mm, thickness t of ring plate r 8mm; the branch pipe takes into account both compression and tension.
According to the calculation method of the invention, the node bearing capacity of the X-shaped stiffening intersecting welding branch pipe when the branch pipe is pressed and the branch pipe is pulled is calculated, meanwhile, according to the section 13.3.2 of the steel structural design standard (GB 50017-2017), the node bearing capacity of the contribution of the node plate and the ring plate is not considered, the materials of the main pipe, the branch pipe, the node plate and the ring plate are Q355, and the yield strength is 355N/mm 2 Design strength 305N/mm 2 The method comprises the steps of carrying out a first treatment on the surface of the The smaller value sigma of the compressive stress of the main pipes at the two sides of the node is 0.
The results are shown in table 1, and it is quite significant to explain that the contribution of the node plates and the ring plates is considered, the node bearing capacity is obviously improved, and the node bearing capacity calculation method for the X-shaped stiffening intersecting welding node bearing capacity of the steel pipe is used for calculating the node bearing capacity of the X-shaped stiffening intersecting welding pressure branch pipe and the tension branch pipe, and is more economical and reasonable.
TABLE 1 node bearing capacity calculation comparison
Other non-illustrated parts are known in the art.
Claims (2)
1. The method for calculating the bearing capacity of the X-shaped stiffening intersecting welding node of the steel pipe is characterized by comprising the following steps of:
step 1: step 1: determining the smaller stress sigma of the main pipe at two sides of the node and the yield strength f of the main pipe steel y Calculating to obtain an intermediate parameter psi n ：
Wherein σ is a small value of compressive stress of the two sides of the node, and when the two sides or one side of the node is in tension, σ=0;
step 2: determining the diameter D of the branch pipe and the diameter D of the main pipe, and calculating the pipe diameter ratio beta of the branch pipe to the main pipe:
beta=d/D (formula 2)
Step 3: based on the included angle theta between the branch pipe and the main pipe, the thickness T of the main pipe and the intermediate parameter psi n Main pipe steel strength design value f m Calculating to obtain a non-stiffening node contribution item N of the bearing capacity of the X-shaped stiffening intersecting welding node when the branch pipe is pressed cX And a non-stiffening node part contribution item N of X-shaped stiffening intersecting welding node bearing capacity when the branch pipe is pulled tX ：
The branch pipe is pressed:
the branch pipe is pulled:
step 4: effective length l of node plate based on main pipe diameter D p Design value f of strength of steel material of gusset plate p Main pipe thickness T, pressure branch pipe and main pipe angle θ, intermediate parameter ψ n Calculating to obtain a node plate part contribution item N of the X-shaped stiffening penetration welding node bearing capacity when the branch pipe is pressed cXP And the contribution item N of the node plate part with stiffening intersecting welding node bearing capacity of X shape when the branch pipe is pulled tXP ：
Pressurized branch pipe:
tension branch pipe:
step 5: based on the diameter D of the main pipe, the thickness T of the main pipe and the thickness T of the annular plate r Height h of ring plate r Calculating to obtain an annular plate part contribution item N of the X-shaped stiffening penetration welding node bearing capacity when the branch pipe is pressed cXR And the contribution item N of the annular plate part with stiffening intersecting welding node bearing capacity of X shape when the branch pipe is pulled tXR ：
Pressurized branch pipe:
tension branch pipe:
in the formula 7 and the formula 8, the alpha value is radian;
step 6, based on the non-stiffening node part contribution, the node plate part contribution and the annular plate part contribution of the X-shaped stiffening intersecting welding node bearing capacity, respectively calculating to obtain X-shaped stiffening intersecting welding with the pressed branch pipesNode bearing capacity N cXPR Bearing capacity N of X-shaped stiffening intersecting welding joint for tension of branch pipe tXPR ：
Pressurized branch pipe: n (N) cXPR ＝N cX +N cXP +N cXR (equation 9)
Tension branch pipe: n (N) tXPR ＝N tX +N tXP +N tXR (equation 10).
2. The method for calculating the bearing capacity of the X-shaped stiffening intersecting welding node of the steel pipe according to claim 1, wherein in the step 5, when the annular plate is a full ring, α=1.1pi is taken; when the annular plate is a 1/4 ring and a half ring, alpha is the radian of the annular plate; when the two side ring plates are semi-rings and can be fully replaced, the full ring is made, and the bearing capacity is considered according to the full ring; when (when)At the time, take
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113515801A (en) * | 2021-07-23 | 2021-10-19 | 中国电力工程顾问集团中南电力设计院有限公司 | Method for calculating bearing capacity of K-shaped steel pipe penetration welding joint with stiffening rib |
| CN115758825A (en) * | 2022-11-18 | 2023-03-07 | 中国能源建设集团山西省电力勘测设计院有限公司 | Method and device for calculating limit bearing capacity of intersecting node of double-ring stiffening rib |
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- 2023-05-30 CN CN202310622285.1A patent/CN117236092B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113515801A (en) * | 2021-07-23 | 2021-10-19 | 中国电力工程顾问集团中南电力设计院有限公司 | Method for calculating bearing capacity of K-shaped steel pipe penetration welding joint with stiffening rib |
| CN115758825A (en) * | 2022-11-18 | 2023-03-07 | 中国能源建设集团山西省电力勘测设计院有限公司 | Method and device for calculating limit bearing capacity of intersecting node of double-ring stiffening rib |
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