CN107944138B - Steel pipe node stress concentration coefficient calculation method based on node rigidity - Google Patents

Steel pipe node stress concentration coefficient calculation method based on node rigidity Download PDF

Info

Publication number
CN107944138B
CN107944138B CN201711178740.4A CN201711178740A CN107944138B CN 107944138 B CN107944138 B CN 107944138B CN 201711178740 A CN201711178740 A CN 201711178740A CN 107944138 B CN107944138 B CN 107944138B
Authority
CN
China
Prior art keywords
pipe
steel pipe
stress concentration
node
main
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201711178740.4A
Other languages
Chinese (zh)
Other versions
CN107944138A (en
Inventor
吴庆雄
黄汉辉
陈康明
陈宝春
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fuzhou University
Original Assignee
Fuzhou University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fuzhou University filed Critical Fuzhou University
Priority to CN201711178740.4A priority Critical patent/CN107944138B/en
Publication of CN107944138A publication Critical patent/CN107944138A/en
Application granted granted Critical
Publication of CN107944138B publication Critical patent/CN107944138B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • 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
    • G06F2119/06—Power analysis or power optimisation

Landscapes

  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Pure & Applied Mathematics (AREA)
  • Mathematical Optimization (AREA)
  • Mathematical Analysis (AREA)
  • Computer Hardware Design (AREA)
  • Evolutionary Computation (AREA)
  • General Engineering & Computer Science (AREA)
  • Computational Mathematics (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

Abstract

The invention discloses a steel pipe node stress concentration coefficient calculation method based on node rigidity, which considers each main rigidity of a steel pipe node, including main pipe radial rigidityK 1Axial stiffness of branch pipeK 2Bending stiffness of branch pipeK 3Bending stiffness of the main tubeK 4Main pipe axial stiffnessK 5And axial stiffness of intersecting weld along branch pipeK 6And introducing important coefficients of the main rigidity ratios to the stress concentration coefficients of the steel pipe nodes according to the contribution of the main rigidity ratios of the steel pipe nodes to the stress concentration coefficients of the steel pipe nodes and the mutual coupling effect of the stress concentration coefficients of the steel pipe nodes, thereby obtaining the steel pipe node stress concentration coefficient calculation method based on the node rigidity. The invention comprehensively considers all current basic parameters influencing the stress concentration coefficient of the steel pipe node and the mutual coupling effect among the basic parameters, thereby reflecting and evaluating the stress concentration degree of the steel pipe node more comprehensively.

Description

Steel pipe node stress concentration coefficient calculation method based on node rigidity
Technical Field
The invention relates to the technical field of steel pipe node design, in particular to a steel pipe node stress concentration coefficient calculation method based on node rigidity.
Background
The steel pipe joint has the advantages of concise appearance, clear force transmission path, closed section, easy corrosion resistance, small wind resistance coefficient and the like, thereby being widely applied to the fields of large-span bridges, buildings and the like. However, since the connection between the main pipe and the branch pipe of the steel pipe node is a spatial curved intersecting weld with a constantly changing curvature, stress concentration is easily generated in a certain area of the steel pipe node, and the magnitude of the stress concentration not only weakens the bearing capacity of the steel pipe node, but also shortens the fatigue life of the steel pipe node.
The current calculation method for the stress concentration coefficient of the steel pipe node is mainly obtained by analyzing single parameters, namely the ratio beta of the diameter of the branch pipe to the diameter of the main pipe, the ratio gamma of the diameter of the main pipe to the wall thickness of the main pipe, the ratio tau of the wall thickness of the branch pipe to the wall thickness of the main pipe and an included angle theta between the main pipe and the branch pipe, neglecting the coupling influence of the different parameters on the stress concentration coefficient of the steel pipe node, namely changing one parameter can cause the change of other parameters. For example, when the ratio β of the branch pipe diameter to the main pipe diameter is used for calculation, the ratio γ of the main pipe diameter to the main pipe wall thickness is changed. Therefore, the current method of the stress concentration coefficient of the steel pipe node obtained by single parameter analysis cannot comprehensively grasp the stress concentration degree of the steel pipe node, and may even be contrary to the expectation of the designer on the stress concentration degree of the steel pipe node.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a steel pipe node stress concentration coefficient calculation method based on node rigidity, which considers all the geometric parameters influencing the stress concentration coefficient of the steel pipe node at present, eliminates the problem that the coupling effect among the parameters cannot be considered in the current steel pipe node stress concentration coefficient calculation method, and integrally grasps the stress concentration degree of the steel pipe node.
In order to achieve the purpose, the technical scheme of the invention is as follows: a steel pipe node stress concentration coefficient calculation method based on node rigidity considers each main rigidity of a steel pipe node, including main pipe radial rigidity K1Axial stiffness K of branch pipe2Bending stiffness K of branch pipe3Main pipe bending rigidity K4Main pipe axial stiffness K5And axial stiffness K of intersecting weld joint along branch pipe6The steel pipe node stress concentration coefficient expression is as follows:
Figure BDA0001478750600000011
wherein SCF is the stress concentration coefficient of the steel pipe node; m is1Is axial rigidity K of branch pipe2Radial rigidity K of main pipe1Comparing the contribution of the stress concentration coefficient of the steel pipe node; m is2Is a bending rigidity K of the main pipe4Bending rigidity K of branch pipe3Comparing the contribution of the stress concentration coefficient of the steel pipe node; m is3Axial stiffness K of intersecting weld along branch pipe6Axial rigidity K of main pipe5The contribution of the stress concentration coefficient of the steel pipe node is compared.
Further, the main pipe radial stiffness K1Axial stiffness K of branch pipe2Bending stiffness K of branch pipe3Main pipe bending rigidity K4Main pipe axial stiffness K5And axial stiffness K of intersecting weld joint along branch pipe6The influence on the stress concentration coefficient of the steel pipe is determined by the following formula:
Figure BDA0001478750600000021
Figure BDA0001478750600000022
Figure BDA0001478750600000023
Figure BDA0001478750600000024
Figure BDA0001478750600000025
K6＝E(k1d+k2D)t tanθ
wherein E is the elastic modulus of the steel pipe; d is the diameter of the main pipe; d is the diameter of the branch pipe; t is the main pipe wall thickness; t is the wall thickness of the branch pipe; theta is an included angle between the main pipe axis and the branch pipe axis; k is a radical of1The influence coefficient of the diameter d of the branch pipe on the length of the intersecting weld joint is shown; k is a radical of2The influence coefficient of the main pipe diameter D on the length of the intersecting weld seam is shown.
Further, the existing steel pipe nodes are utilized to count the diameter of the branch pipe and the length of the intersecting weld joint, the following linear regression equation is adopted to analyze the correlation between the diameter of the branch pipe and the length of the intersecting weld joint, and finally the regression calculation is carried out to obtain the influence coefficient k of the diameter d of the branch pipe on the length of the intersecting weld joint1：
L＝k1d
Wherein L is the length of the intersecting weld.
Further, the existing steel pipe nodes are utilized to count the main pipe diameter and the length of the intersecting weld joint, the following linear regression equation is adopted to analyze the correlation between the main pipe diameter and the length of the intersecting weld joint, and finally the regression calculation is carried out to obtain the influence coefficient k of the main pipe diameter D on the length of the intersecting weld joint2：
L＝k2D
Wherein L is the length of the intersecting weld.
Compared with the prior art, the invention has the beneficial effects that: all the geometric parameters influencing the stress concentration coefficient of the steel pipe node at present can be considered, the coupling effect among the geometric parameters cannot be considered in the current calculation method of the stress concentration coefficient of the steel pipe node is eliminated, and the stress concentration degree of the steel pipe node is integrally grasped.
Drawings
FIG. 1 is a front view of a steel pipe joint according to an embodiment of the present invention;
FIG. 2 is a side view of a steel pipe node according to an embodiment of the present invention;
fig. 3 is a plan view of a steel pipe joint according to an embodiment of the present invention.
Detailed Description
The invention is further explained below with reference to the drawings and the embodiments.
As shown in figure 1, the method for calculating the stress concentration coefficient of the steel pipe node based on the node stiffness considers each main stiffness of the steel pipe node, including main pipe radial stiffness K1Axial stiffness K of branch pipe2Bending stiffness K of branch pipe3Main pipe bending rigidity K4Main pipe axial stiffness K5And axial stiffness K of intersecting weld joint along branch pipe6The steel pipe node stress concentration coefficient expression is as follows:
Figure BDA0001478750600000031
wherein SCF is the stress concentration coefficient of the steel pipe node; m is1Is axial rigidity K of branch pipe2Radial rigidity K of main pipe1Comparing the contribution of the stress concentration coefficient of the steel pipe node; m is2Is a bending rigidity K of the main pipe4Bending rigidity K of branch pipe3Comparing the contribution of the stress concentration coefficient of the steel pipe node; m is3Axial stiffness K of intersecting weld along branch pipe6Axial rigidity K of main pipe5The contribution of the stress concentration coefficient of the steel pipe node is compared.
In the present embodiment, the main pipe radial stiffness K1Axial stiffness K of branch pipe2Bending stiffness K of branch pipe3Main pipe bending rigidity K4Main pipe axial stiffness K5And axial stiffness K of intersecting weld joint along branch pipe6The influence on the stress concentration coefficient of the steel pipe is determined by the following formula:
Figure BDA0001478750600000032
Figure BDA0001478750600000033
Figure BDA0001478750600000041
Figure BDA0001478750600000042
Figure BDA0001478750600000043
K6＝E(k1d+k2D)t tanθ
wherein E is the elastic modulus of the steel pipe; d is the diameter of the main pipe; d is the diameter of the branch pipe; t is the main pipe wall thickness; t is the wall thickness of the branch pipe; theta is an included angle between the main pipe axis and the branch pipe axis;k1the influence coefficient of the diameter d of the branch pipe on the length of the intersecting weld joint is shown; k is a radical of2The influence coefficient of the main pipe diameter D on the length of the intersecting weld seam is shown.
In this embodiment, the existing steel pipe joints are used to count the branch pipe diameter and the length of the intersecting weld joint, the following linear regression equation is used to analyze the correlation between the branch pipe diameter and the length of the intersecting weld joint, and finally the regression calculation is performed to obtain the influence coefficient k of the branch pipe diameter d on the length of the intersecting weld joint1：
L＝k1d
Wherein L is the length of the intersecting weld.
In this embodiment, the existing steel pipe node is used to count the main pipe diameter and the length of the intersecting weld, the following linear regression equation is used to analyze the correlation between the main pipe diameter and the length of the intersecting weld, and finally the regression calculation is performed to obtain the influence coefficient k of the main pipe diameter D on the length of the intersecting weld2：
L＝k2D
Wherein L is the length of the intersecting weld.
The method adopts each main rigidity of the steel pipe nodes as a basic parameter, constructs a basic calculation model of the calculation method of the stress concentration coefficient of the steel pipe nodes according to the coupling relation among the main rigidities of the steel pipe nodes, introduces the important coefficient of each main rigidity ratio to the stress concentration coefficient of the steel pipe nodes according to the contribution degree of each main rigidity ratio of the steel pipe nodes to the stress concentration coefficient of the steel pipe nodes, and further obtains the calculation method of the stress concentration coefficient of the steel pipe nodes based on the node rigidity. All the geometric parameters influencing the stress concentration coefficient of the steel pipe node at present are considered, the coupling effect among the geometric parameters cannot be considered in the calculation method for eliminating the stress concentration coefficient of the steel pipe node at present, and the stress concentration degree of the steel pipe node is integrally grasped.
The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the present invention.

Claims (4)

1. Steel pipe joint based on joint rigidityThe method for calculating the point stress concentration coefficient is characterized in that each main rigidity of the steel pipe node is considered, including the main pipe radial rigidity K1Axial stiffness K of branch pipe2Bending stiffness K of branch pipe3Main pipe bending rigidity K4Main pipe axial stiffness K5And axial stiffness K of intersecting weld joint along branch pipe6The steel pipe node stress concentration coefficient expression is as follows:
Figure FDA0001478750590000011
wherein SCF is the stress concentration coefficient of the steel pipe node; m is1Is axial rigidity K of branch pipe2Radial rigidity K of main pipe1Comparing the contribution of the stress concentration coefficient of the steel pipe node; m is2Is a bending rigidity K of the main pipe4Bending rigidity K of branch pipe3Comparing the contribution of the stress concentration coefficient of the steel pipe node; m is3Axial stiffness K of intersecting weld along branch pipe6Axial rigidity K of main pipe5The contribution of the stress concentration coefficient of the steel pipe node is compared.
2. The method for calculating the stress concentration coefficient of a steel pipe node according to claim 1, wherein the main pipe radial stiffness K1Axial stiffness K of branch pipe2Bending stiffness K of branch pipe3Main pipe bending rigidity K4Main pipe axial stiffness K5And axial stiffness K of intersecting weld joint along branch pipe6The influence on the stress concentration coefficient of the steel pipe is determined by the following formula:
Figure FDA0001478750590000012
Figure FDA0001478750590000013
Figure FDA0001478750590000014
Figure FDA0001478750590000015
Figure FDA0001478750590000016
K6＝E(k1d+k2D)ttanθ
wherein E is the elastic modulus of the steel pipe; d is the diameter of the main pipe; d is the diameter of the branch pipe; t is the main pipe wall thickness; t is the wall thickness of the branch pipe; theta is an included angle between the main pipe axis and the branch pipe axis; k is a radical of1The influence coefficient of the diameter d of the branch pipe on the length of the intersecting weld joint is shown; k is a radical of2The influence coefficient of the main pipe diameter D on the length of the intersecting weld seam is shown.
3. The method for calculating the stress concentration coefficient of the steel pipe joint according to claim 2, wherein the existing steel pipe joint is used for counting the diameter of the branch pipe and the length of the intersecting weld joint, the following linear regression equation is adopted for analyzing the correlation between the diameter of the branch pipe and the length of the intersecting weld joint, and finally the influence coefficient k of the diameter d of the branch pipe on the length of the intersecting weld joint is obtained through regression calculation1：
L＝k1d
Wherein L is the length of the intersecting weld.
4. The method for calculating the stress concentration coefficient of a steel pipe node according to claim 2, wherein the existing steel pipe node is used for counting the main pipe diameter and the length of the intersecting weld joint, the following linear regression equation is adopted for analyzing the correlation between the main pipe diameter and the length of the intersecting weld joint, and the final regression calculation is used for obtaining the influence coefficient k of the main pipe diameter D on the length of the intersecting weld joint2：
L＝k2D
Wherein L is the length of the intersecting weld.
CN201711178740.4A 2017-11-23 2017-11-23 Steel pipe node stress concentration coefficient calculation method based on node rigidity Active CN107944138B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201711178740.4A CN107944138B (en) 2017-11-23 2017-11-23 Steel pipe node stress concentration coefficient calculation method based on node rigidity

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201711178740.4A CN107944138B (en) 2017-11-23 2017-11-23 Steel pipe node stress concentration coefficient calculation method based on node rigidity

Publications (2)

Publication Number Publication Date
CN107944138A CN107944138A (en) 2018-04-20
CN107944138B true CN107944138B (en) 2021-03-30

Family

ID=61930016

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201711178740.4A Active CN107944138B (en) 2017-11-23 2017-11-23 Steel pipe node stress concentration coefficient calculation method based on node rigidity

Country Status (1)

Country Link
CN (1) CN107944138B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110390165B (en) * 2019-07-23 2021-03-30 福州大学 Method for calculating stress concentration coefficient of concrete filled steel tube welding intersecting node
CN113515801B (en) * 2021-07-23 2022-06-28 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 steel pipe K-shaped stiffening intersecting welding node
CN114004125A (en) * 2021-11-03 2022-02-01 河海大学 Method for calculating peak value of stress concentration coefficient of tube node under axial force load and application
CN114004045B (en) * 2021-11-25 2024-08-23 大连理工大学 Y-type pipe node stress concentration coefficient calculation method, device and storable medium

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101674929A (en) * 2007-04-30 2010-03-17 空中客车英国有限公司 Composite structure comprising a stringer with a pad embedded in the recess of a panel and method of transmitting forces
CN103853892A (en) * 2014-03-21 2014-06-11 清华大学 Modeling and stress analysis method for silicon carbide coating layer of non-spherical fuel particles
CN104614227A (en) * 2015-02-15 2015-05-13 南京工业大学 Method for calculating ultra-high cycle fatigue crack initiation time
JP2015108588A (en) * 2013-12-05 2015-06-11 三菱日立パワーシステムズ株式会社 Stress analysis system and stress analysis method of piping system welded portion
CN104809311A (en) * 2015-05-14 2015-07-29 东南大学 Structural part remaining life predicting method based on multi-factor fusion correction
EP3161692A1 (en) * 2014-06-25 2017-05-03 Siemens Aktiengesellschaft Method for analysis of 3d features using a 2d probabilistic analysis
CN107133388A (en) * 2017-04-12 2017-09-05 傅德生 A kind of method to cast steel node finite element analysis

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101674929A (en) * 2007-04-30 2010-03-17 空中客车英国有限公司 Composite structure comprising a stringer with a pad embedded in the recess of a panel and method of transmitting forces
JP2015108588A (en) * 2013-12-05 2015-06-11 三菱日立パワーシステムズ株式会社 Stress analysis system and stress analysis method of piping system welded portion
CN103853892A (en) * 2014-03-21 2014-06-11 清华大学 Modeling and stress analysis method for silicon carbide coating layer of non-spherical fuel particles
EP3161692A1 (en) * 2014-06-25 2017-05-03 Siemens Aktiengesellschaft Method for analysis of 3d features using a 2d probabilistic analysis
CN104614227A (en) * 2015-02-15 2015-05-13 南京工业大学 Method for calculating ultra-high cycle fatigue crack initiation time
CN104809311A (en) * 2015-05-14 2015-07-29 东南大学 Structural part remaining life predicting method based on multi-factor fusion correction
CN107133388A (en) * 2017-04-12 2017-09-05 傅德生 A kind of method to cast steel node finite element analysis

Also Published As

Publication number Publication date
CN107944138A (en) 2018-04-20

Similar Documents

Publication Publication Date Title
CN107944138B (en) Steel pipe node stress concentration coefficient calculation method based on node rigidity
Silvestre et al. Post-buckling behaviour and direct strength design of lipped channel columns experiencing local/distortional interaction
CN110443407B (en) Node flow optimal distribution method for improving transient hydraulic simulation precision of water supply series pipeline
CN110737960A (en) shield tunnel segment design parameter optimization method
CN113836658B (en) Calculation method for bearing capacity of compression-resistant design of Y-shaped cast steel node
CN102284512A (en) Control method for manufacturing process of large deformation pipeline steel pipe
CN106126847B (en) A kind of determination method of thermoplasticity reinforced composite pipe road design ratio
CN109376865A (en) A kind of truss structure security assessment method based on discrete type Bayesian network
CN107588879B (en) Rope supports the equal for hinged girder interpolation model method for building up of bridge cable group's cable force vibration method measurement
CN110555281A (en) evaluation method for integrity of deep rock mass
CN110390165B (en) Method for calculating stress concentration coefficient of concrete filled steel tube welding intersecting node
JP4696893B2 (en) Method for evaluating local buckling performance of steel pipe, material design method for steel pipe, and method for manufacturing steel pipe
CN109614747B (en) Layout design method for pipelines in high aspect ratio wing
CN108763667B (en) Simplified design method of large-curvature curve steel-concrete combined box girder bridge
Uenaka et al. Concrete filled double skin tubular members subjected to bending
Zhang et al. New formula relating the yield stress-strain with the strength coefficient and the strain-hardening exponent
CN112100879B (en) Composite material structural strength analysis method considering fiber braiding damage
CN106055800A (en) Deformation calculation method of internal bias non-coaxial type cab stabilizer bar system
CN108804837A (en) A kind of high-pressure rubber pipe optimum structure design method based on finite element
CN107729654B (en) Method for determining corresponding relation between maximum value of wind drift tension of wire and wind speed
CN109540349A (en) A kind of consideration many factors influence sunpender tension recognition methods
CN118504397A (en) Particle swarm optimization algorithm-based steel tube concrete section plastic stress parameter identification method
Kang et al. Extensional vibration analysis of curved beams including rotatory inertia and shear deformation using DQM
CN114004125A (en) Method for calculating peak value of stress concentration coefficient of tube node under axial force load and application
CN106759861B (en) The calculation method of welded hollow spherical joints spatial mesh structure beam element rod piece moment of flexure

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant