CN112699509A - Method for checking ultimate strength of flange connecting bolt - Google Patents
Method for checking ultimate strength of flange connecting bolt Download PDFInfo
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- CN112699509A CN112699509A CN202110028286.4A CN202110028286A CN112699509A CN 112699509 A CN112699509 A CN 112699509A CN 202110028286 A CN202110028286 A CN 202110028286A CN 112699509 A CN112699509 A CN 112699509A
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- G—PHYSICS
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- G06F30/10—Geometric CAD
- G06F30/17—Mechanical parametric or variational design
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
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- G06F30/13—Architectural design, e.g. computer-aided architectural design [CAAD] related to design of buildings, bridges, landscapes, production plants or roads
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- G—PHYSICS
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
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Abstract
The invention discloses a checking method of flange connecting bolt ultimate strength, which establishes finite element model by carrying out operations such as grid division on three-dimensional assembly drawing of flange and connecting bolt, applying pretightening force to the bolts, setting a fixed boundary constraint condition on the tower prosthesis at the lower flange side, setting MPC constraint on the tower prosthesis at the upper flange side, respectively applying unit loads of Fx, Fy, Fz, Mx, My and Mz to the center of the joint surface of the flange, respectively performing solution calculation, wherein the unit of the applied unit load is consistent with the unit of the limit load of the center of the flange, and synthesizing a relational expression between the stress borne by the bolt and six load components according to the stress of each bolt under each unit load, and substituting the limit load under each limit working condition into the relational expression between the stress borne by the bolt and the six load components to obtain the bolt stress result under each limit working condition. The invention can obtain the stress result of each bolt under each limit working condition, and the calculation is efficient and reliable.
Description
Technical Field
The invention relates to a method for checking the ultimate strength of a flange connecting bolt, which is widely applied to a flange bolt connecting structure and belongs to the technical field of finite element strength calculation.
Background
At present, the flange bolt connecting structure is widely applied to the field of industrial buildings. Whether the flange connecting bolt is safe or not is directly related to the safety of the whole structure. The Petersen-based method is generally adopted in ultimate strength checking engineering of the flange connecting bolt, and because the Petersen method does not consider the influence of pretightening force on bolt deformation and the influence of bending moment on the bolt in a theoretical model and is only suitable for L-type and T-type flange connection, the Petersen method adopts a larger safety coefficient for calculating the bolt to make up for theoretical defects. In addition, a finite element method is adopted, and solving is carried out on all working conditions, so that the solving time is long, and more repeated work is carried out by engineers.
Disclosure of Invention
The invention aims to provide a method for checking the ultimate strength of a flange connecting bolt aiming at the defects of the prior art. The method is suitable for any flange bolt connection structure, and calculation is more accurate.
The invention is realized by the following technical scheme:
a method for checking the ultimate strength of a flange connecting bolt comprises the following steps:
step 1: constructing a finite element model by using a finite element pretreatment tool and a three-dimensional assembly drawing of a flange and a bolt, wherein in the finite element model, an upper flange 4 is arranged on the upper part of a tower prosthesis 6, and a lower flange 5 is arranged on the lower part of the tower prosthesis; the stud 2 penetrates through the upper flange 4 and the lower flange 5 and is locked by the nut 1; the connecting parts of the upper flange 4, the lower flange 5 and the tower prosthesis 6 are provided with high-strength gaskets 3. The length of the tower cylinder prosthesis connected with the flange is not less than two times of the outer diameter of the flange, a friction contact relation is set between the upper flange and the lower flange, friction contact relations are set between the high-strength washer and the upper flange, friction contact relations are set between the high-strength washer and the bolt nut, binding contact ways are adopted between the high-strength washer and the bolt nut, a pretightening force is applied to the bolt, a fixed boundary constraint condition is set on the steel cylinder prosthesis on one side of the lower flange, MPC constraint is set on the steel cylinder prosthesis on one side of the upper flange, unit loads of Fx, Fy, Fz, Mx, My and Mz are respectively applied to the center of the flange face and are respectively subjected to solution calculation, and the unit of the applied unit load is consistent with the unit of the ultimate load of the.
Step 2: and synthesizing a relational expression between the stress borne by each bolt and six load components at the center of the steel cylinder according to the stress of each bolt under each unit load, and substituting the central limit load of the tower cylinder into the expression to obtain the stress borne by the bolt.
And step 3: and calculating the safety margin of the bolt according to the allowable stress of the bolt and the stress value of each bolt under each working condition.
The invention can obtain the following beneficial effects:
1. the method can be used for calculating the flange connecting bolts in any structural form, and has a wide application range.
2. The invention only needs to calculate the stress borne by the bolt under unit load, then can obtain the stress of each bolt under each working condition through simple polynomial operation, has high calculation efficiency, and can quickly calculate the stress value of the bolt under the limit working condition even if the limit working condition is changed.
3. The method has the advantages of clear theoretical principle, simple process, convenient implementation and high calculation efficiency.
The above description is only for the purpose of disclosure, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are intended to be covered by the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Drawings
Fig. 1 is a schematic view of a connection structure of flanges in the present invention.
FIG. 2 is a flow chart of the method implementation.
In the figure: 1. the high-strength steel column comprises a nut, 2, a stud, 3, a high-strength washer, 4, an upper flange, 5, a lower flange, 6 and a tower prosthesis.
Detailed Description
The method for checking the ultimate strength of the flange connecting bolt is described below with reference to the accompanying structural drawings.
In this embodiment, Hypermesh is used to perform finite element preprocessing, and Abaqus is used to perform unit load solving.
Firstly, processing an assembly body of a flange connecting bolt in Hypermesh software, establishing finite element modeling, wherein the length of a tower cylinder prosthesis connected with a flange is not less than twice of the outer diameter of the flange, frictional contact relations are set between an upper flange and a lower flange, frictional contact relations are set between a high-strength washer and the upper flange and between the high-strength washer and the lower flange, binding contact ways are adopted for connection between the high-strength washer and a bolt nut and between the high-strength washer and a bolt nut, bolt pretightening force is applied, a fixed boundary constraint condition is set for the tower cylinder prosthesis at one side of the lower flange, the tower cylinder prosthesis at one side of the upper flange is provided with an MPC constraint to apply unit loads of Fx, Fy, Fz, Mx, My and Mz respectively at the center of a flange surface, six solving files are generated, and the unit of the applied unit load is consistent with the unit of the.
And secondly, submitting the solved file to Abaqus for calculation, numbering the bolts, extracting the stress of each bolt under each load component, and writing a relational expression between the stress borne by each bolt and the six load components according to respective stress results of the same bolt under the six load components.
And thirdly, substituting the limit load into a relational expression between the stress borne by the bolt and six load components, and calculating the stress borne by each bolt and the safety margin of each bolt by using Excel.
Claims (6)
1. A method for checking the ultimate strength of a flange connecting bolt is characterized by comprising the following steps:
step 1: constructing a finite element model by using a finite element pretreatment tool and using a three-dimensional assembly drawing of an upper flange, a lower flange and a bolt, wherein in the finite element model, the upper part of the tower prosthesis is provided with the upper flange, and the lower part of the tower prosthesis is provided with the lower flange; the stud penetrates through the upper flange and the lower flange and is locked by the nut; high-strength washers are mounted at the connecting parts of the upper flange, the lower flange 5 and the tower cylinder prosthesis, and apply pretightening force to the bolts; the tower prosthesis on one side of the lower flange is provided with fixed boundary constraint conditions, the tower prosthesis on one side of the upper flange is provided with MPC constraint to apply unit loads of Fx, Fy, Fz, Mx, My and Mz to the center of the flange respectively, and solution calculation is performed respectively, and the unit of the applied unit load is consistent with the unit of the limit load of the center of the flange;
step 2: synthesizing a relational expression between the stress borne by the bolt and six load components at the center of the tower prosthesis according to the stress of each bolt under each unit load, and substituting the central limit load of the tower prosthesis into the expression to obtain the stress borne by the bolt;
and step 3: and calculating the safety margin of the bolt according to the allowable stress of the bolt and the stress value of each bolt under each working condition.
2. A method for checking the ultimate strength of a flange connection bolt according to claim 1, characterized in that: the length of the tower cylinder prosthesis connected with the flange is not less than twice of the outer diameter of the flange, the upper flange and the lower flange are in friction contact, the high-strength washer and the upper flange and the high-strength washer and the lower flange are in friction contact, and the high-strength washer and the bolt nut are connected in a binding contact mode.
3. A method for checking the ultimate strength of a flange connection bolt according to claim 1, characterized in that: the applied load is the unit load at the center of the flange, and the unit of the load is consistent with the unit of the limit load at the center of the flange.
4. A method for checking the ultimate strength of a flange connection bolt according to claim 1, characterized in that: the stress borne by the bolt is the relation with six load components of Fx, Fy, Fz, Mx, My and Mz, and the stress comprises a prestress value generated by the self-pretightening force of the bolt.
5. A method for checking the ultimate strength of a flange connection bolt according to claim 1, characterized in that: the stress of the bolt under the action of the unit load and the pretightening force of the bolt is calculated only by a finite element method, six component values of the ultimate load are substituted into a relational expression of the stress borne by the bolt and the six load components, and the stress result of each bolt under each ultimate working condition is obtained through simple polynomial operation.
6. A method for checking the ultimate strength of a flange connection bolt according to claim 1, characterized in that: when the limit working condition load changes, six component values of the lower substitution relational expression are changed, and then the stress result of the bolt is obtained.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110028286.4A CN112699509A (en) | 2021-01-08 | 2021-01-08 | Method for checking ultimate strength of flange connecting bolt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110028286.4A CN112699509A (en) | 2021-01-08 | 2021-01-08 | Method for checking ultimate strength of flange connecting bolt |
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| CN112699509A true CN112699509A (en) | 2021-04-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110028286.4A Pending CN112699509A (en) | 2021-01-08 | 2021-01-08 | Method for checking ultimate strength of flange connecting bolt |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103353907A (en) * | 2013-06-17 | 2013-10-16 | 沈阳华创风能有限公司 | Calculating method of ultimate strength checking of connection of flange and bolt |
| CN109299532A (en) * | 2018-09-17 | 2019-02-01 | 许继集团有限公司 | A kind of blower mainframe connect bolt strength check method and system with rear frame |
| CN109726412A (en) * | 2017-10-31 | 2019-05-07 | 北京万源工业有限公司 | A kind of check method of flange bolt fatigue strength |
-
2021
- 2021-01-08 CN CN202110028286.4A patent/CN112699509A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103353907A (en) * | 2013-06-17 | 2013-10-16 | 沈阳华创风能有限公司 | Calculating method of ultimate strength checking of connection of flange and bolt |
| CN109726412A (en) * | 2017-10-31 | 2019-05-07 | 北京万源工业有限公司 | A kind of check method of flange bolt fatigue strength |
| CN109299532A (en) * | 2018-09-17 | 2019-02-01 | 许继集团有限公司 | A kind of blower mainframe connect bolt strength check method and system with rear frame |
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