CN113722857B - Method for evaluating fatigue performance of corrugated steel web-steel pipe welded joint - Google Patents
Method for evaluating fatigue performance of corrugated steel web-steel pipe welded joint Download PDFInfo
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- CN113722857B CN113722857B CN202111026307.5A CN202111026307A CN113722857B CN 113722857 B CN113722857 B CN 113722857B CN 202111026307 A CN202111026307 A CN 202111026307A CN 113722857 B CN113722857 B CN 113722857B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 180
- 239000010959 steel Substances 0.000 title claims abstract description 180
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000003466 welding Methods 0.000 claims abstract description 31
- 238000011156 evaluation Methods 0.000 abstract description 19
- 206010016256 fatigue Diseases 0.000 description 30
- 239000000463 material Substances 0.000 description 3
- 238000005336 cracking Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001808 coupling effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/17—Mechanical parametric or variational design
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/12—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to investigating the properties, e.g. the weldability, of materials
- B23K31/125—Weld quality monitoring
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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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
- G06F2119/02—Reliability analysis or reliability optimisation; Failure analysis, e.g. worst case scenario performance, failure mode and effects analysis [FMEA]
Abstract
The invention belongs to the technical field of welding of steel pipes or steel plates, and particularly relates to a method for evaluating fatigue performance of a corrugated steel web-steel pipe welded joint. The invention uses the axial rigidity of the contact surface between the welding seam and the steel pipe in the corrugated steel web-steel pipe welding jointK b Radial stiffness of steel tube in welded joint with corrugated steel web-steel tubeK p The ratio is recorded as an evaluation index mode so as to achieve the purpose of accurately evaluating fatigue performance of the welded joint of the corrugated steel web and the steel pipe. The invention has the following advantages: the evaluation index in the invention is a dimensionless ratio index, wherein the dimensionless ratio index comprises the self-size and performance parameters of the corrugated steel web, the self-size and performance parameters of the steel pipe and the self-size of the welding seam, has high integrity and high reliability, and can relatively accurately represent the fatigue performance of the welded joint of the corrugated steel web and the steel pipe.
Description
Technical Field
The invention belongs to the technical field of welding of steel pipes or steel plates, and particularly relates to a method for evaluating fatigue performance of a corrugated steel web-steel pipe welded joint.
Background
The corrugated steel web-steel pipe welded joint is used as a novel joint, has the advantages of attractive appearance, strong weld continuity, good stress performance, capability of effectively solving the fatigue cracking problem of the steel pipe welded joint and the like, and is widely applied to the fields of bridges, buildings and the like.
With the increase of the service life of the corrugated steel web-steel pipe welded joint, particularly under the environment of repeated action of live load, the corrugated steel web-steel pipe welded joint has the risk of fatigue cracking.
The current evaluation indexes for fatigue performance of the welded joint of the corrugated steel web and the steel pipe mainly comprise: corrugated steel web plate thicknesst b Curved connecting radius of corrugated steel webR b Width of straight steel plate of corrugated steel webl b Inclined web inclination angle of corrugated steel webθ b Pipe diameter of steel pipeD p And wall thickness of steel pipet p And when the fatigue performance of the welded joint of the corrugated steel web and the steel pipe is evaluated by adopting the evaluation index, a single dimensional index is adopted.
However, when the fatigue performance of the welded joint of the corrugated steel web and the steel pipe is evaluated by adopting a single dimensional index, on one hand, the influence degree of different indexes on the fatigue performance of the welded joint of the corrugated steel web and the steel pipe cannot be compared, and on the other hand, the coupling effect on the fatigue performance of the welded joint of the corrugated steel web and the steel pipe when different indexes are changed simultaneously cannot be considered.
Therefore, the current evaluation method adopts a single dimension index to evaluate the fatigue performance of the welding joint of the corrugated steel web and the steel pipe, the fatigue performance of the welding joint of the corrugated steel web and the steel pipe cannot be comprehensively grasped, and the fatigue performance of the welding joint of the corrugated steel web and the steel pipe may be expected to be contrary to the designer.
Therefore, in view of the above, there is an urgent need for a dimensionless index, which considers all the original single dimensionless indexes, and ensures that the fatigue performance of the welded joint of the corrugated steel web and the steel pipe is more integrally and exactly reflected.
The Chinese patent publication No. CN 112846601A and publication No. 2021.05.28 discloses a method for evaluating low cycle fatigue performance of a welded joint based on welding microcell performance, which comprises the steps of establishing a finite element model for a rod-shaped sample gauge length section, dividing the finite element model into different microcells, endowing each microcell with elastic performance and plastic performance, applying displacement load to the finite element model, calculating local strain distribution of the gauge length section under different nominal strain, calculating local strain of the plastic region under different nominal strain according to the local strain distribution, and evaluating the low cycle fatigue performance of the welded joint by the local strain of the plastic region obtained by elastoplastic finite element calculation endowed with elastoplastic mechanical performance of each microcell.
However, the evaluation method in the patent of the invention does not sufficiently consider the self-size of the welded joint and other factors, so that a large deviation exists between the final performance evaluation result and the actual performance of the welded microcell.
Disclosure of Invention
The invention aims to provide a method for evaluating fatigue performance of a corrugated steel web-steel pipe welding joint, which can be realized by axially stiffness of a contact surface of a welding line and a steel pipe in the corrugated steel web-steel pipe welding jointK b Radial stiffness of steel tube in welded joint with corrugated steel web-steel tubeK p The ratio is recorded as an evaluation index mode so as to achieve the purpose of accurately evaluating fatigue performance of the welded joint of the corrugated steel web and the steel pipe.
The invention adopts the technical proposal that: the method for evaluating the fatigue performance of the welded joint of the corrugated steel web and the steel pipe sequentially comprises the following steps:
s1, measuring the sizes of a corrugated steel web, a welding seam and a steel pipe, and determining performance parameters of the corrugated steel web and the steel pipe according to the types and the models of the corrugated steel web and the steel pipe;
s2, calculating to obtainK b ；
S3, calculating to obtainK p ；
S4, calculating to obtain a ratioη；
S5, determining fatigue performance of the welded joint of the corrugated steel web and the steel pipe according to the numerical value of eta,
wherein,K b is the axial rigidity of the contact surface between the welding seam and the steel pipe in the corrugated steel web-steel pipe welding joint,K p the radial rigidity of the steel pipe in the corrugated steel web-steel pipe welding joint,
wherein,。
the further preferable technical scheme is as follows: the numerical value of the ratio eta is in positive correlation with the fatigue performance of the welded joint of the corrugated steel web plate and the steel pipe.
The further preferable technical scheme is as follows:
，
wherein E is b Represents the modulus of elasticity of the corrugated steel web,
L b from the following componentsl b 、θ b 、R b 、D p AndH b It is decided that the method comprises the steps of,
W b is that
，
Wherein t is b Representing the thickness, w, of a corrugated steel web d Indicating the exposed width of the weld.
The further preferable technical scheme is as follows:
when (when)In the time-course of which the first and second contact surfaces,
；
when (when)In the time-course of which the first and second contact surfaces,
，
wherein l b Representing wave steelWeb straight steel plate width, theta b Represents the inclined web inclination angle of the corrugated steel web,R b represents the curve connecting radius of the corrugated steel web,D p represents the pipe diameter of the steel pipe, H b Representing the total thickness of the corrugated steel web.
The further preferable technical scheme is as follows: :
，
wherein E is p Represents the elastic modulus of the steel pipe, t p The wall thickness of the steel pipe is shown,D p representing the pipe diameter of the steel pipe.
An evaluation index for fatigue performance of a corrugated steel web-steel pipe welding joint is axial rigidity of a contact surface of a welding line and a steel pipe in the corrugated steel web-steel pipe welding jointK b Radial stiffness of steel tube in welded joint with corrugated steel web-steel tubeK p The ratio between the values is marked asηI.e.
。
The invention has the following advantages: the evaluation index in the invention is a dimensionless ratio index, wherein the evaluation index comprises the self-size and performance parameters of the corrugated steel web, the self-size and performance parameters of the steel pipe and the self-size of the welding seam, has high integrity and high reliability, and can relatively accurately represent the fatigue performance of the welded joint of the corrugated steel web and the steel pipe; secondly, the ratio index in the invention integrates physical size and performance parameters, not only considers the characteristics of the materials, but also introduces the specific specification of the welded joint, and ensures that the fatigue performance of the welded joint of the corrugated steel web-steel pipe with each specification under various materials can be accurately evaluated; thirdly, according to the evaluation method provided by the invention, the larger the evaluation index value is, the better the fatigue performance of the corrugated steel web-steel pipe welded joint is, and conversely, the worse the fatigue performance is, so that the whole evaluation method is very simple and easy to understand.
Drawings
FIG. 1 is a schematic diagram of a welding mode of a corrugated steel web and a steel pipe in the invention.
Fig. 2 is a schematic diagram of the position structure of a welded joint of a corrugated steel web and a steel pipe in the invention.
Fig. 3 is a schematic structural view of a corrugated steel web in the present invention.
Detailed Description
The following description is of the preferred embodiments of the invention and is not intended to limit the scope of the invention.
Examples: as shown in figures 1-3, the fatigue performance of the welding joint of the corrugated steel web and the steel pipe is evaluated by the method, namely the axial rigidity K of the contact surface of the welding seam and the steel pipe in the welding joint of the corrugated steel web and the steel pipe b Radial rigidity K of steel pipe in welding joint with corrugated steel web-steel pipe p The ratio between them is used as an evaluation index, the evaluation index is marked as eta, namely
。
Secondly, the first step of the method comprises the steps of,wherein E is b Represents the elastic modulus of the corrugated steel web, L b From l b 、θ b 、R b 、D p And H b Determining W b Is->，
Wherein t is b Representing the thickness, w, of a corrugated steel web d Indicating the exposed width of the weld.
While whenIn the time-course of which the first and second contact surfaces,
；
while whenIn the time-course of which the first and second contact surfaces,
，
wherein l b Represents the width, theta of the straight steel plate of the corrugated steel web b Represents the inclined web inclination angle of the corrugated steel web,R b represents the curve connecting radius of the corrugated steel web,D p represents the pipe diameter of the steel pipe, H b Representing the total thickness of the corrugated steel web.
In this embodiment, the bottom edge total length of the corrugated steel web shown in FIG. 3 is l b 。
In addition, L b By R b : radius of connection and D of curve of corrugated steel web p : pipe diameter of steel pipe
Finally, the step of obtaining the product,，
wherein E is p Represents the elastic modulus of the steel pipe, t p The wall thickness of the steel pipe is shown,D p representing the pipe diameter of the steel pipe.
In the embodiment, the evaluation index eta is a dimensionless ratio, so that the evaluation indexes of the welding nodes of the corrugated steel webs and the steel pipes with different materials and different specifications can be simply and directly compared.
The evaluation method sequentially comprises the following steps:
s1, measuring the sizes of a corrugated steel web, a welding line and a steel pipe, and referring to parameters of the corrugated steel web and the steel pipe;
s2, calculating to obtain K b ；
S3, calculating to obtain K p ；
S4, calculating to obtain a ratio eta;
s5, determining fatigue performance of the welded joint of the corrugated steel web and the steel pipe according to the numerical value of eta.
The ratio eta and the fatigue property of the welded joint of the corrugated steel web plate and the steel pipe are in positive correlation.
In this example, the larger the value of the ratio η, the better the fatigue performance of the welded joint of the corrugated steel web and the steel pipe, and conversely, the worse the fatigue performance.
The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the above embodiments, and various modifications may be made within the knowledge of those skilled in the art without departing from the spirit of the present invention. These are all non-inventive modifications which are intended to be protected by the patent laws within the scope of the appended claims.
Claims (2)
1. The method for evaluating the fatigue performance of the welded joint of the corrugated steel web and the steel pipe is characterized by sequentially comprising the following steps of:
s1, measuring the sizes of a corrugated steel web, a welding seam and a steel pipe, and determining performance parameters of the corrugated steel web and the steel pipe according to the types and the models of the corrugated steel web and the steel pipe;
s2, calculating to obtainK b ；
S3, calculating to obtainK p ；
S4, calculating to obtain a ratioη；
S5, determining fatigue performance of the welded joint of the corrugated steel web and the steel pipe according to the numerical value of eta,
wherein,K b is the axial rigidity of the contact surface between the welding seam and the steel pipe in the corrugated steel web-steel pipe welding joint,K p the radial rigidity of the steel pipe in the corrugated steel web-steel pipe welding joint,
wherein,，
wherein,，
wherein E is b Represents the modulus of elasticity of the corrugated steel web,
L b from the following componentsl b 、θ b 、R b 、D p AndH b It is decided that the method comprises the steps of,
W b is that
，
Wherein t is b Representing the thickness, w, of a corrugated steel web d Indicating the exposed width of the weld joint,
when (when)In the time-course of which the first and second contact surfaces,
；
when (when)In the time-course of which the first and second contact surfaces,
，
wherein l b Represents the width, theta of the straight steel plate of the corrugated steel web b Represents the inclined web inclination angle of the corrugated steel web,R b represents the curve connecting radius of the corrugated steel web,D p represents the pipe diameter of the steel pipe, H b Indicating the total thickness of the corrugated steel web,
wherein,，
wherein E is p The elastic modulus of the steel pipe is shown,t p the wall thickness of the steel pipe is shown,D p representing the pipe diameter of the steel pipe.
2. The method for evaluating fatigue performance of a welded joint of a corrugated steel web and a steel pipe according to claim 1, wherein the method comprises the following steps: the numerical value of the ratio eta is in positive correlation with the fatigue performance of the welded joint of the corrugated steel web plate and the steel pipe.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111026307.5A CN113722857B (en) | 2021-09-02 | 2021-09-02 | Method for evaluating fatigue performance of corrugated steel web-steel pipe welded joint |
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| CN202111026307.5A CN113722857B (en) | 2021-09-02 | 2021-09-02 | Method for evaluating fatigue performance of corrugated steel web-steel pipe welded joint |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011196986A (en) * | 2010-02-26 | 2011-10-06 | Kobe Steel Ltd | Fatigue characteristic evaluation method of t-joint in t-type welded joint structure |
| CN106735997A (en) * | 2017-01-13 | 2017-05-31 | 福州大学 | A kind of evaluation method of steel-pipe welding tubular joint fatigue behaviour |
| CN111175157A (en) * | 2020-01-15 | 2020-05-19 | 西安交通大学 | Low-cycle fatigue performance evaluation method for welding joint |
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- 2021-09-02 CN CN202111026307.5A patent/CN113722857B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011196986A (en) * | 2010-02-26 | 2011-10-06 | Kobe Steel Ltd | Fatigue characteristic evaluation method of t-joint in t-type welded joint structure |
| CN106735997A (en) * | 2017-01-13 | 2017-05-31 | 福州大学 | A kind of evaluation method of steel-pipe welding tubular joint fatigue behaviour |
| CN111175157A (en) * | 2020-01-15 | 2020-05-19 | 西安交通大学 | Low-cycle fatigue performance evaluation method for welding joint |
Non-Patent Citations (1)
| Title |
|---|
| 波形钢板焊接连接件的疲劳试验研究及寿命评价;王志宇;王清远;;建筑结构学报;20150905;第36卷(2015年第09期);第137-146页 * |
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