CN109165447A - A kind of evaluation method and system of the loss of space steel pipe structural walls thickness - Google Patents
A kind of evaluation method and system of the loss of space steel pipe structural walls thickness Download PDFInfo
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Abstract
The invention discloses the evaluation methods and system of a kind of loss of space steel pipe structural walls thickness, method includes the following steps: steel-tube construction geometric & physical property monitors；Determine stiffness matrix of the steel pipe unit under local coordinate system；Stiffness matrix, is expressed as the combination of bar cross section area and cross sectional moment of inertia by the corresponding relationship for analyzing steel pipe unit physical parameter and element stiffness matrix；Establish the sensitivity that steel pipe unit area of section loses wall thickness；Establish the sensitivity that steel pipe unit cross sectional moment of inertia loses wall thickness；Establish the sensitivity that steel pipe element stiffness loses wall thickness under global coordinate system；7) sensitivity that overall structure loses wall thickness is established；8) steel-tube construction frequency mutation analysis evaluation method caused by wall thickness loses is established, and analytical calculation structure wall thickness loses caused dynamic characteristics variation.The present invention utilizes structural dynamic modi- fication principle, cleverly converts the influence to steel pipe unit area of section and the moment of inertia for the influence that wall thickness loses to structure.
Description
Technical field
The present invention relates to what spatial steel structure Performance Evaluation technology more particularly to a kind of space steel pipe structural walls thickness were lost to comment
Valence method and system.
Background technique
Space structure is a kind of typical Civil Infrastructure Systems, since from heavy and light, span is big, interior flexible arrangement, builds
The advantages that area utilization is high is widely used in recent years.By years development, spatial steel structure formed it is a variety of not
Same structure type is to meet different building and structure needs.Space steel-tube construction mainly uses steel tube component as main
Bearing capacity component, therefore be the principal mode of steel construction.Real space steel construction for a long time field be on active service, by burn into high temperature,
The continuous action of the environment such as high wind macroseism and load effect, therefore easily cause damage accumulation even failure damage.State in recent years
It is inside and outside to have spatial steel structure damage and failure accident more, cause serious economic loss and secondary disaster.Therefore, carry out space
Performance evaluation and security evaluation under steel construction Service Environment have important practical significance.
Steel-tube construction long service in the natural environment, inevitably since the corrosiveness of adverse circumstances leads to rod piece
Section loss.The loss of bar cross section will lead to the reduction of steel tube member bar cross-sectional area and the reduction of cross sectional moment of inertia.It will not
The evitable reduction for leading to bar element rigidity, further will lead to the reduction of overall structure rigidity.The power of structure is special
Property is the important indicator of reaction structure military service performance under dynamic load function, and dynamic characteristics then with the direct phase of the rigidity of structure
It closes.Therefore, the reduction of the rigidity of structure inevitably influences integrally-built dynamic characteristics.Recently as numerical computation technology
Rapid development, the static and dynamic force analysis of space steel-tube construction rapidly developed, can using nonlinear finite element method into
Row analytical calculation.There are some powerful finite element analysis software such as ABAQUS, ANSYS etc. that can carry out space steel pipe at present
The dynamic response and dynamic characteristic calculation of structure.But at present during the finite element analysis computation of spatial steel structure, Wu Fayou
Effect considers influence of the different rod piece wall thickness losses to its rigidity in structure, and the different rod piece wall thickness losses of the judge of no standard measure are to knot
Structure rigidity reduces the difference influenced.In addition, conventional method can not quick and precisely evaluate wall thickness loss to dynamic characteristics influence at present
Rule.In general, also very poor for the evaluation method of space steel pipe structural walls thickness loss, still there are many needs of work
Carry out.This respect work at present still belongs to blank, does not have phase also for the evaluation method and system of the loss of space steel pipe structural walls thickness
Close report.
Therefore, it is necessary to which the rod piece wall thickness loss that system research space steel-tube construction occurs under severe Service Environment is special
Point, it is necessary to establish the evaluation method and system of a kind of space steel pipe structural walls thickness loss.Under the premise of ensuring analysis precision,
Fast and effeciently reduce the workload of finite element modeling and military service assessment of performance, this can effectively improve holding for space steel-tube construction
Power computational efficiency and analysis level are carried, large space steel-tube construction is promoted and analyzes appreciable levels.
Summary of the invention
The technical problem to be solved in the present invention is that for the defects in the prior art, providing a kind of space steel pipe structural walls
The evaluation method and system of thickness loss.
The technical solution adopted by the present invention to solve the technical problems is: a kind of evaluation of space steel pipe structural walls thickness loss
Method, comprising the following steps:
1) steel-tube construction geometric & physical property monitors: determine steel pipe unit physical parameter in structure, including each nodal information,
Rod piece link information, rod length L, rod piece internal diameter rin, rod piece outer diameter rout, geological information and elasticity modulus including wall thickness t；
2) stiffness matrix of the steel pipe unit under local coordinate system is determinedThe local coordinate system of the steel pipe unit is
Refer to steel pipe one end kernel of section point as O point, axial is x-axis, and radial is y-axis, and vertical direction is z-axis；
3) corresponding relationship for analyzing steel pipe unit physical parameter and element stiffness matrix, by stiffness matrixIt is expressed as bar
The combination of part area of section and cross sectional moment of inertia；
4) according to stiffness matrixThe relationship of area of section and wall thickness is established steel pipe unit area of section and is lost to wall thickness
Sensitivity
Wherein,For thickness of steel pipe, ri,outFor i-th steel pipe unit
Outer radius；
5) according to stiffness matrixThe relationship of cross sectional moment of inertia and wall thickness establishes steel pipe unit cross sectional moment of inertia to wall thickness
The sensitivity of lossWith
6) wall thickness is damaged in the sensitivity and steel pipe unit cross sectional moment of inertia lost according to steel pipe unit area of section to wall thickness
The sensitivity that steel pipe element stiffness loses wall thickness under global coordinate system is established in the sensitivity of mistake
7) according to the sensitivity that steel pipe element stiffness loses wall thickness under global coordinate system, institute is superimposed under global coordinate system
There is steel pipe element stiffness matrix, establishes the sensitivity that overall structure loses wall thickness
8) steel-tube construction frequency mutation analysis evaluation method caused by wall thickness loses is established, and analytical calculation structure wall thickness damages
Dynamic characteristics changes delta f caused by losingr。
According to the above scheme, by stiffness matrix in the step 3)It is expressed as the combination of bar cross section area and the moment of inertia,
It is specific as follows:
In formula:
Wherein: AiFor the area of section of i-th of steel pipe unit under local coordinate system；
In formula: ri,inAnd ri,outThe inside radius and outer radius of i-th of steel pipe unit respectively；WithRespectively i-th
The moment of inertia of the steel pipe unit in x, y, z direction.
According to the above scheme, in the step 5), the formula table for the sensitivity that steel pipe unit cross sectional moment of inertia loses wall thickness
Show as follows:
According to the above scheme, in the step 6), steel pipe element stiffness loses wall thickness under global coordinate system sensitivity
Formula is expressed as follows:
According to the above scheme, in the step 7), overall structure is expressed as follows the formula for the sensitivity that wall thickness loses:
According to the above scheme, in the step 8), dynamic characteristics changes delta frFormula be expressed as follows:
The present invention also provides a kind of evaluation systems of space steel pipe structural walls thickness loss, comprising:
Steel-tube construction geometric & physical property monitoring modular, for determining each nodal information in structure, rod piece link information, bar
Material parameters such as geological informations and elasticity modulus such as part length, rod piece radius, wall thickness etc.；
Steel pipe unit physical parameter and element stiffness matrix corresponding relationship analysis module, for stiffness matrix to be expressed as bar
The combination of part area of section and the moment of inertia；
The sensitivity determining module that steel pipe unit sectional area loses wall thickness occurs for the single steel pipe unit of analytical calculation
Area of section variation after wall thickness loss, the sensitivity that further analytical calculation area of section loses wall thickness；
The sensitivity determining module that steel pipe unit cross sectional moment of inertia loses wall thickness is used for the single steel pipe unit of analytical calculation
Cross sectional moment of inertia variation after wall thickness loss occurs, the sensitivity that further analytical calculation cross sectional moment of inertia loses wall thickness；
The sensitivity determining module that steel pipe element stiffness loses wall thickness under global coordinate system, for according to area of section and
The moment of inertia changes the influence to element stiffness, the sensitivity that analysis steel pipe element stiffness loses wall thickness；
The sensitivity determining module that overall structure loses wall thickness, the steel-tube construction being initially formed under global coordinate system are whole
Then stiffness matrix establishes sensitivity of the single steel pipe unit wall thickness loss to overall structure order frequency；
Steel-tube construction frequency mutation analysis evaluation module, for establishing steel-tube construction frequency variation point caused by wall thickness loses
Evaluation method is analysed, and analytical calculation structure wall thickness loses caused dynamic characteristics variation.
The beneficial effect comprise that:
One, a kind of space steel pipe structural walls thickness loss assessment method proposed by the present invention has clear concept, analytical calculation
Accurate advantage.The analysis method and system have applicability, suitable for various different spans, height and different physical
The wall thickness loss analysis of space steel-tube construction is assessed.
Two, currently used method is the analysis meter that steel pipe Structural Static power performance in space is carried out using finite element method
It calculates.But since space steel-tube construction is made of many rod pieces, must be established respectively for single rod piece in analytic process
Then accurate finite element model considers that the wall thickness of each rod piece loses and carries out dynamic Property Analysis calculating one by one respectively, point
Analysis process is very cumbersome and complicated, not very practical, empty especially for the numerous large size of rod piece for practical operation angle
Between steel-tube construction, can not establish fine finite element analysis model at all and carry out the analysis of its wall thickness loss for each rod piece
Assessment.And a kind of space steel pipe structural walls thickness loss assessment method proposed by the present invention is passed through using structural dynamic modi- fication principle
The corresponding relationship for establishing steel pipe unit physical parameter and element stiffness matrix, by its stiffness matrix be expressed as bar cross section area with
The combination of the moment of inertia.Cleverly the shadow to steel pipe unit area of section and the moment of inertia is converted by the influence that wall thickness loses to structure
It rings.
Three, what the present invention innovated establishes the sensitivity point that steel pipe unit area of section and cross sectional moment of inertia lose wall thickness
Analysis method.Sensitivity and overall structure rigidity that steel pipe element stiffness under global coordinate system loses wall thickness are established to wall thickness
The sensitivity of loss.On this basis, the assay method of steel-tube construction frequency variation caused by wall thickness loses is established.It is logical
It crosses such an approach achieves the analysis to the loss sensitivity of steel pipe unit wall thickness, realizes wall thickness loss to structure military service performance shadow
Loud assessment.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples, in attached drawing:
Fig. 1 is the method flow diagram of the embodiment of the present invention；
Fig. 2 is the axonometric drawing and elevation of the space steel-tube construction of the embodiment of the present invention；
Fig. 3 is the local coordinate system schematic diagram of the steel pipe unit of the embodiment of the present invention；
Fig. 4 is the wall thickness loss of the steel pipe unit of the embodiment of the present invention with the variation schematic diagram of Years Of Service；
Fig. 5 is that wall thickness loss occurs for the steel pipe unit of the embodiment of the present invention to the influence schematic diagram of 5 order frequencies before structure；
Fig. 6 is that the influence that the lasting section of the structure generation different year of the embodiment of the present invention is lost to preceding 5 order frequency is shown
It is intended to.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, is not used to limit
The fixed present invention.
As shown in Figure 1, a kind of evaluation method of space steel pipe structural walls thickness loss, comprising the following steps:
Step 1: each nodal information in steel-tube construction, rod piece link information, rod length, rod piece radius, wall thickness etc. are determined
Geological information and elasticity modulus establish the stiffness matrix under steel pipe unit local coordinate system；
It is illustrated in figure 3 the local coordinate system O-XYZ of steel pipe unit.The space of two, steel pipe unit both ends node 1 and 2 is sat
Mark is respectively as follows: (x1,y1,z1)、(x2,y2,z2).The progress of three-dimensional space beam element usually can be used in the steel pipe unit of spatial steel structure
It simulates, there are three translational degree of freedom and three rotational freedoms on each node.Then corresponding modal displacement indicates are as follows: (u1,v1,
w1,θx1,θy1,θz1)、(u2,v2,w2,θx2,θy2,θz2).In local coordinate system lower node motion vectorAnd force vectorIt can indicate
Are as follows:
The stiffness matrix of i-th steel pipe unit and mass matrix may be expressed as: under local coordinate system
In formula: ρiFor the density of material of i-th cell；BiFor strain-transposed matrix of i-th cell；HiFor the shape of i-th cell
Function；DiFor the material matrix of i-th cell；V is the integral domain of i-th cell.It is managed based on Euler-Bernoulli beam element
By the stiffness matrix of steel pipe unit under local coordinate systemIt may be expressed as:
Step 2: the corresponding relationship of steel pipe unit physical parameter and stiffness matrix is established
In beam element stiffness matrixIn, physical parameter relevant to thickness of steel pipe is mainly area of section, all directions
The moment of inertia:
Therefore, the stiffness matrix of i-th of steel pipe unit is represented by area of section A under local coordinate systemi, all directions it is used
Property square WithLinear combination:
In formula:
Step 3: the sensitivity that steel pipe unit area of section loses wall thickness is established
Steel pipe unit long service, area of section under the adverse circumstances such as corrosion will be gradually reduced and cause overall structure
The degeneration of Static and dynamical behavior.Therefore, influence of the area of section loss to structural behaviour can be evaluated by Dynamic Modification technology.Steel
The reduction of pipe unit wall thickness will cause its area of section AiReduction.The area of section of steel pipe unit may be expressed as:
In formula: ri,inAnd ri,outThe inside radius and outer radius of i-th of steel pipe unit respectively.
Area of section is to thickness of steel pipeSensitivity may be expressed as:
Step 4: the sensitivity that the transversal the moment of inertia of steel pipe unit loses wall thickness is established
Steel pipe unit wall thicknessReduction will cause its cross sectional moment of inertiaWithReduction.
The steel tube section the moment of inertia of different directions is to its wall thicknessSensitivity can respectively indicate are as follows:
Therefore, cross sectional moment of inertia is to thickness of steel pipeSensitivity may be expressed as:
Step 5: the sensitivity that steel pipe element stiffness loses wall thickness under global coordinate system is established
I-th of steel pipe element stiffness is to wall thickness under local coordinate systemSensitivity may be expressed as:
Further, it can establish under local coordinate system i-th of steel pipe element stiffness to wall thicknessCalculation formula:
Using transformation matrix of coordinatesIt can be by the element stiffness matrix under local coordinate systemBe converted to global coordinate system
Under element stiffness matrix Ki:
It is possible thereby to the element stiffness matrix K under establishing global coordinate systemiTo wall thicknessCalculation of Sensitivity formula:
Step 6: the sensitivity that overall structure loses wall thickness is established
By being superimposed all steel pipe element stiffness matrixs under global coordinate system, the rigidity square of steel-tube construction entirety can be established
Battle array K:
In formula: ne is the quantity of all rod pieces in steel-tube construction.
The characteristic equation of the r first order mode of structure entirety may be expressed as:
In formula: M and K is respectively integrally-built mass matrix and stiffness matrix ωrAnd φrRespectively integrally-built
R stage frequency and vibration shape vector.
The sensitivity of i-th of steel pipe unit can be obtained by solving characteristic equation:
In view of integrally-built mass matrix and stiffness matrix are symmetrical matrix and consider vibration shape vector and quality
Matrix M meets normalizing condition, therefore can obtain sensitivity of i-th of the unit wall thickness loss of steel-tube construction to its r order frequency:
In view of the combination that the Bulk stiffness matrix of structure is each unit stiffness matrix, therefore i-th of steel-tube construction single
First wall thickness loss may be expressed as: the sensitivity of its r order frequency
Step 7: steel-tube construction frequency mutation analysis method caused by wall thickness loses is established
It has been determined that rod piece outer wall due to caused by severe Service Environment losesAfterwards, that is, it can determine caused entirety
The frequency of structure changes:
Due to there are multiple rod pieces that wall thickness loss occurs in structure, the influence of different rod pieces can be superimposed so that it is determined that institute
There is rod piece wall thickness to lose the influence to integrally-built frequency:
In formula: nm is the quantity that the rod piece of wall thickness loss occurs in steel-tube construction due to environmental degradation.
A kind of evaluation method and system of the loss of space steel pipe structural walls thickness characterized by comprising
Steel-tube construction geometric & physical property monitoring modular, for determining each nodal information in structure, rod piece link information, bar
Material parameters such as geological informations and elasticity modulus such as part length, rod piece radius, wall thickness etc.；
Steel pipe unit physical parameter and element stiffness matrix corresponding relationship analysis module, for stiffness matrix to be expressed as bar
The combination of part area of section and the moment of inertia；
For analytical calculation single steel pipe unit wall thickness occurs for the sensitivity module that steel pipe unit sectional area loses wall thickness
Area of section variation after loss, the sensitivity that further analytical calculation area of section loses wall thickness；
The sensitivity module that steel pipe unit cross sectional moment of inertia loses wall thickness occurs for the single steel pipe unit of analytical calculation
Cross sectional moment of inertia variation after wall thickness loss, the sensitivity that further analytical calculation cross sectional moment of inertia loses wall thickness；
The sensitivity analysis module that steel pipe element stiffness loses wall thickness under global coordinate system, for group collection area of section and
The moment of inertia changes the influence to element stiffness, the sensitivity that analysis steel pipe element stiffness loses wall thickness；
The sensitivity analysis module that overall structure loses wall thickness, the steel-tube construction being initially formed under global coordinate system are whole
Then stiffness matrix establishes sensitivity of the single steel pipe unit wall thickness loss to overall structure order frequency；
Steel-tube construction frequency mutation analysis evaluation module, for establishing steel-tube construction frequency variation point caused by wall thickness loses
Evaluation method is analysed, and analytical calculation structure wall thickness loses caused dynamic characteristics variation.
Specific implementation of the patent process is described with real space steel-tube construction case below:
Certain space steelpipe net shell structure, span are 50 meters, and 8 meters of height shares 500 steel tube member bar units.Bar material
Elasticity modulus is 2.01 × 1011Pa, density of material 7800kg/m3, Poisson's ratio 0.28.The outer radius of steel pipe unit is
180mm, area of section 0.002749m2.The inside radius of steel pipe unit is 159mm, area of section 0.002419m2.Steel pipe list
First material is Q235 steel, yield strength 235MPa.Due to being on active service for many years, part rod piece occurs the space steel-tube construction
A degree of wall thickness loss, the rod piece that wall thickness loss occurs on inspection account for about the half of all rod piece quantity.Fig. 2 is the sky
Between steel-tube construction axonometric drawing and elevation.The local coordinate system of steel pipe unit is initially set up as shown in figure 3, wherein long along rod piece
Spending direction is X to two orthogonal directions along rod piece cross section are respectively Y-direction and Z-direction.
It is first depending on formula (5) and writes computer program and determine stiffness matrix of the steel pipe unit under local coordinate system
Computer program is write by stiffness matrix according to formula (6) and (7)It is expressed as bar cross section area and the moment of inertia
Combination；
The sensitivity that computer program determines that steel pipe unit sectional area loses wall thickness is write according to formula (15)
Computer program, which is write, according to formula (23), (25) and (27) determines that steel pipe unit cross sectional moment of inertia loses wall thickness
SensitivityWith
The sensitivity that computer program determines that steel pipe element stiffness loses wall thickness under coordinate system is write according to formula (31)
The sensitivity that computer program determines that overall structure loses wall thickness is write according to formula (37)
Computer program, which is write, according to formula (39) determines that structure wall thickness loses caused dynamic characteristics changes delta fr。
Fig. 4 give steel pipe unit wall thickness loss with Years Of Service variation, numerical value can by structure into
Row in-site measurement obtains.After Fig. 5 gives the generation wall thickness loss of steel pipe unit, influence of the different units to 5 order frequencies before structure.
After Fig. 6 gives the lasting section loss that different year occurs for structure, the influence to its preceding 5 order frequency.
Analysis the result shows that: (1) wall thickness loss occurs for the unit of structure different location, influence to the rigidity of structure exist compared with
Big difference；(2) the radial rod piece (rm) along structure radius direction usually there is biggish wall thickness to lose sensitivity, main cause
It is the main bearing member that radial rod piece is structure, therefore its rigidity is affected to structure overall frequency；(3) along structure perimeter
There is the circumferential rod piece (cm) in direction lesser wall thickness to lose sensitivity, wherein close to the internal layer circumferential direction rod piece of structure centre
The wall thickness loss that the wall thickness loss sensitivity of (cm1, cm2, cm3) is significantly greater than outer layer circumferential direction rod piece (cm4, cm5, cm6) is sensitive
Degree；(4) along the slanting oblique unit (sm) of structure there is biggish wall thickness to lose sensitivity, wherein close to the internal layer of structure centre
The wall thickness loss sensitivity of oblique unit (sm1, sm2, sm3) is significantly greater than the wall thickness of the oblique unit of outer layer (sm4, sm5, sm6)
Lose sensitivity；(5) with the increase of structure active time, wall thickness loss of the structure under adverse circumstances effect is gradually increased,
This rigidity that will lead to structure entirety is gradually reduced.Therefore, also lead to being gradually reduced for structure overall frequency, structure is caused to be on active service
The degeneration of performance.(6) appraisal procedure precision proposed by the present invention is high, fully meets the requirement of Practical Project analysis；(7) of the invention
The Equivalent analysis method of proposition has many advantages, such as that applied widely, amount of calculation is small, analysis precision is high, calculating is quick.
It should be understood that for those of ordinary skills, it can be modified or changed according to the above description,
And all these modifications and variations should all belong to the protection domain of appended claims of the present invention.
Claims (7)
1. a kind of evaluation method of space steel pipe structural walls thickness loss, which comprises the following steps:
1) steel-tube construction geometric & physical property monitors: determining steel pipe unit physical parameter in structure, including each nodal information, rod piece
Link information, rod length L, rod piece internal diameter rin, rod piece outer diameter rout, geological information and elasticity modulus including wall thickness t；
2) stiffness matrix of the steel pipe unit under local coordinate system is determinedThe local coordinate system of the steel pipe unit refers to steel
Pipe one end kernel of section point is O point, and axial is x-axis, and radial is y-axis, and vertical direction is z-axis；
3) corresponding relationship for analyzing steel pipe unit physical parameter and element stiffness matrix, by stiffness matrixIt is expressed as bar cross section
The combination of area and cross sectional moment of inertia；
4) according to stiffness matrixThe relationship of area of section and wall thickness establishes the spirit that steel pipe unit area of section loses wall thickness
Sensitivity
Wherein,For thickness of steel pipe, ri,outIt is outer the half of i-th of steel pipe unit
Diameter；
5) according to stiffness matrixThe relationship of cross sectional moment of inertia and wall thickness is established steel pipe unit cross sectional moment of inertia and is lost to wall thickness
SensitivityWith
6) what wall thickness was lost in the sensitivity and steel pipe unit cross sectional moment of inertia lost according to steel pipe unit area of section to wall thickness
The sensitivity that steel pipe element stiffness loses wall thickness under global coordinate system is established in sensitivity
7) according to the sensitivity that steel pipe element stiffness loses wall thickness under global coordinate system, all steel are superimposed under global coordinate system
Pipe unit stiffness matrix establishes the sensitivity that overall structure loses wall thickness
8) steel-tube construction frequency mutation analysis evaluation method caused by wall thickness loses is established, and the loss of analytical calculation structure wall thickness is drawn
The dynamic characteristics changes delta f risenr。
2. the evaluation method of space steel pipe structural walls thickness loss according to claim 1, which is characterized in that the step 3)
It is middle by stiffness matrixIt is expressed as the combination of bar cross section area and the moment of inertia, specific as follows:
In formula:
Wherein: AiFor the area of section of i-th of steel pipe unit under local coordinate system；
In formula: ri,inAnd ri,outThe inside radius and outer radius of i-th of steel pipe unit respectively；WithRespectively i-th of steel pipe
The moment of inertia of the unit in x, y, z direction.
3. the evaluation method of space steel pipe structural walls thickness loss according to claim 1, which is characterized in that the step 5)
In, steel pipe unit cross sectional moment of inertia is expressed as follows the formula for the sensitivity that wall thickness loses:
4. the evaluation method of space steel pipe structural walls thickness loss according to claim 1, which is characterized in that the step 6)
In, steel pipe element stiffness is expressed as follows the formula for the sensitivity that wall thickness loses under global coordinate system:
5. the evaluation method of space steel pipe structural walls thickness loss according to claim 1, which is characterized in that the step 7)
In, overall structure is expressed as follows the formula for the sensitivity that wall thickness loses:
6. the evaluation method of space steel pipe structural walls thickness loss according to claim 1, which is characterized in that the step 8)
In, dynamic characteristics changes delta frFormula be expressed as follows:
7. a kind of evaluation system of space steel pipe structural walls thickness loss characterized by comprising
Steel-tube construction geometric & physical property monitoring modular, for determining that each nodal information in structure, rod piece link information, rod piece are long
Material parameters such as geological informations and elasticity modulus such as degree, rod piece radius, wall thickness etc.；
Steel pipe unit physical parameter and element stiffness matrix corresponding relationship analysis module are cut for stiffness matrix to be expressed as rod piece
The combination of face area and the moment of inertia；
For analytical calculation single steel pipe unit wall thickness occurs for the sensitivity determining module that steel pipe unit sectional area loses wall thickness
Area of section variation after loss, the sensitivity that further analytical calculation area of section loses wall thickness；
The sensitivity determining module that steel pipe unit cross sectional moment of inertia loses wall thickness occurs for the single steel pipe unit of analytical calculation
Cross sectional moment of inertia variation after wall thickness loss, the sensitivity that further analytical calculation cross sectional moment of inertia loses wall thickness；
The sensitivity determining module that steel pipe element stiffness loses wall thickness under global coordinate system, for according to area of section and inertia
Square changes the influence to element stiffness, the sensitivity that analysis steel pipe element stiffness loses wall thickness；
The sensitivity determining module that overall structure loses wall thickness, the steel-tube construction overall stiffness being initially formed under global coordinate system
Then matrix establishes sensitivity of the single steel pipe unit wall thickness loss to overall structure order frequency；
Steel-tube construction frequency mutation analysis evaluation module is commented for establishing steel-tube construction frequency mutation analysis caused by wall thickness loses
Valence method, and analytical calculation structure wall thickness loses caused dynamic characteristics variation.
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| CN110851988A (en) * | 2019-11-15 | 2020-02-28 | 中国石油集团测井有限公司华北分公司 | Casing pipe state evaluation method |
| CN110851904A (en) * | 2019-11-12 | 2020-02-28 | 武汉理工大学 | Method and system for quickly analyzing structural parameter sensitivity of outer frame inner cylinder television tower |
| CN113484396A (en) * | 2021-06-24 | 2021-10-08 | 中国电建集团华东勘测设计研究院有限公司 | Corrosion monitoring sensor, monitoring device and monitoring method for coupling four-probe potential drop measurement and tow electrode technology |
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| CN110851904A (en) * | 2019-11-12 | 2020-02-28 | 武汉理工大学 | Method and system for quickly analyzing structural parameter sensitivity of outer frame inner cylinder television tower |
| CN110851988A (en) * | 2019-11-15 | 2020-02-28 | 中国石油集团测井有限公司华北分公司 | Casing pipe state evaluation method |
| CN113484396A (en) * | 2021-06-24 | 2021-10-08 | 中国电建集团华东勘测设计研究院有限公司 | Corrosion monitoring sensor, monitoring device and monitoring method for coupling four-probe potential drop measurement and tow electrode technology |
| CN113484396B (en) * | 2021-06-24 | 2024-04-09 | 中国电建集团华东勘测设计研究院有限公司 | Corrosion monitoring device and method for coupling four-probe potential drop measurement and tow electrode |
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| CN109165447B (en) | 2022-12-13 |
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