CN110285939A - Railway steel bridge node weld seam random crack propagation based on vibration control inhibits system - Google Patents
Railway steel bridge node weld seam random crack propagation based on vibration control inhibits system Download PDFInfo
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- CN110285939A CN110285939A CN201910267784.7A CN201910267784A CN110285939A CN 110285939 A CN110285939 A CN 110285939A CN 201910267784 A CN201910267784 A CN 201910267784A CN 110285939 A CN110285939 A CN 110285939A
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- steel bridge
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
- G01M5/0008—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings of bridges
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
- G01M5/0033—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by determining damage, crack or wear
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Abstract
The present invention relates to a kind of, and the railway steel bridge node weld seam random crack propagation based on vibration control inhibits system, it includes: dynamic displacement data acquisition system module, displacement-stress mapped system module, three-dimensional cracks extensions path analysis system module, crack tip stress intensity factor control system module, vibration actuator, random crack propagation inhibition system module；Vibration actuator is connected to the lower section of railway steel bridge.The present invention is based on the principles of structural vibration control, can inhibit the extension of railway steel bridge node bead crack, guarantee the safety of bridge structure.
Description
Technical field
The present invention relates to field of civil engineering, in particular to the inhibition system of railway steel bridge node weld seam random crack propagation
System.
Background technique
Fatigue failure is one of main harm of railway steel bridge.The initial crack defect caused by weldquality and its
Extension is one of an important factor for causing railway steel bridge fatigue failure.Weld seam initial crack is such as let alone to develop without being renovated,
It then will lead to crackle constantly to extend until destruction, causes catastrophic accident.The mode of conventional process bead crack mainly passes through
It improves bridge welding technological level and carries out stringent construction management, prevent the generation of initial crack as far as possible.However initial crack
It is influenced by multiple factors, such as human factor, residual stress, temperature, stress ratio etc., furthermore some crackles can take in bridge
Occur after labour a period of time, therefore its distribution over time and space all has very strong randomness and concealment.So passing
The method of system can not fundamentally solve bridge bead crack scaling problem.
For this reason, it is necessary to a kind of system for inhibiting railway steel bridge node weld seam random crack propagation be invented, so that no matter splitting
How are the randomness and concealment of line distribution, can guarantee that crackle no longer extends.
Summary of the invention
The technical problems to be solved by the present invention are: it is random to provide a kind of railway steel bridge node weld seam based on vibration control
Crack propagation inhibits system, its principle based on structural vibration control can inhibit the extension of railway steel bridge node bead crack,
Guarantee the safety of bridge structure.
The technical solution adopted by the present invention to solve the technical problems is:
Railway steel bridge node weld seam random crack propagation based on vibration control inhibits system, it includes:
The dynamic displacement data acquisition system module of the dynamic displacement response time-histories of acquisition railway steel bridge node region,
By it is collected it is dynamic displacement time course data be changed into dynamic stress time course data displacement-stress mapped system module,
According to the zigzag geometrical characteristic in initial crack cracking face, pass through crack tip region acquired in mapping block
Real-time dynamic stress, obtain crack extending length and direction three-dimensional cracks extensions path analysis system module,
The real-time dynamic stress of crack tip region, crack extending length and direction are inputted, analysis crackle is calculated and does not continue
The crack tip stress intensity factor control system module of required direction of control force and size when extension,
Vibration actuator,
To vibration actuator input control signal, starting vibration actuator generates vibration control power and welds railway steel bridge node
The seam random crack tip factor is limited to the random crack propagation in steel threshold range and inhibits system module；
Vibration actuator is connected to the lower section of railway steel bridge.
In above scheme, the vibration actuator is suspended on railway steel bridge lower part.
In above scheme, the vibration actuator is arranged between railway steel bridge lower boom, and laterally setting.
The working principle of above system are as follows:
(1) displacement data acquisition system module is moved: for the dynamic displacement of automatic collection railway steel bridge node when train is passed a bridge
TIME HISTORY SIGNAL is responded, and these signals are transferred to dynamic displacement data acquisition module as needed for node Crack growth analysis and are moved
Displacement boundary conditions.
(2) displacement-stress conversion mapped system module: for the structure of conventional control function and effect to be moved displacement or speed
The corresponding Mapping and Converting of dynamic stress index needed for the mark senses Fatigue Assessments such as degree.Dynamic displacement sensing will be received on bridge first
The information of device is handled to obtain the boundary dynamic displacement response of railway steel bridge node, and acquisition displacement is then applied to finite element
On Shell model in the multiple dimensioned model of software, so as to which railway steel bridge node boundary needed for fatigue analysis crack propagation is moved
Displacement is written in the storage file of boundary.The entity mould of multiple dimensioned model is transmitted to using boundary storage file as input condition again
In type, finally by railway steel bridge weld seam node submodel stress analysis, the real-time of railway weld seam node danger zone is obtained
Dynamic stress, to realize dynamic mapping of the drift index to dynamic stress index required for crack Propagation.
(3) the real-time dynamic stress of crack tip region is inputted, the three-dimensional cracks extension road in crack extending length and direction is obtained
Diameter analysis system module: the module mainly according to the zigzag geometrical characteristic in initial crack cracking face, passes through institute in mapping block
The real-time dynamic stress of crack tip region at the dangerous cracking point of acquisition, realizes the three-dimensional cracks of railway steel bridge weld seam initial crack
Extensions path trace analysis.
(4) the real-time dynamic stress of input crack tip region, crack extending length and direction, calculate analysis crackle do not occur after
The crack tip stress intensity factor control system module of required direction of control force and size when continuous extension: the module with it is aforementioned
Dynamic displacement data acquisition system module, displacement-stress conversion mapped system module, three-dimensional cracks extensions path analysis system mould
Block is connected, based on Based on principles of crack mechanics obtain crack tip at stress intensity factor, control crack tip stress intensity because
Son is less than material threshold.
(5) Xiang Zhendong actuator input control signal, starting vibration actuator generate vibration control power for railway steel bridge section
The spotweld random crack tip factor is limited to the random crack propagation in steel threshold range and inhibits system module: the module root
According to the structural vibration control device being arranged on bridge, receives crack tip stress intensity factor control system module transfer and come
Signal, calculate control force size, starting vibration actuator generates corresponding control force, reduces structural response, and mapping reduces knot
Structure stress, crack tip stress factor control within the scope of material threshold, and railway steel bridge node weld seam random crack can be completed
The inhibition of extension.
It is also an advantage of the present invention that: even if the distribution of railway steel bridge weld seam initial crack over time and space has very
Strong randomness and concealment, the system are not necessarily to detect the position that crackle occurs, only need to be by control principle to railway steel bridge
The stress intensity factor value at node bead crack tip controls in certain threshold range, then no matter the bead crack generates
How are the randomness and concealment of position or time of origin, and crackle can effectively be inhibited to continue to extend.The present invention can substantially change
The fatigue resistance of kind railway steel bridge has biggish practical engineering application value.
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 schematic structural view of the invention.
Fig. 2 is the sensor arrangement figure of the embodiment of the present invention.
Fig. 3 is bridge vertical motion control device layout drawing.
Fig. 4 is the horizontal vibration control apparatus layout drawing of bridge.
Fig. 5 is the system block diagram of the embodiment of the present invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, not
For limiting the present invention.
As shown in Figure 1, 2, the present invention is based on the railway steel bridge node weld seam random crack propagations of vibration control to inhibit system
Embodiment includes:
The dynamic displacement data acquisition system module of the dynamic displacement response time-histories of acquisition railway steel bridge node region,
By it is collected it is dynamic displacement time course data be changed into dynamic stress time course data displacement-stress mapped system module,
According to the zigzag geometrical characteristic in initial crack cracking face, pass through crack tip region acquired in mapping block
Real-time dynamic stress, obtain crack extending length and direction three-dimensional cracks extensions path analysis system module,
The real-time dynamic stress of crack tip region, crack extending length and direction are inputted, analysis crackle is calculated and does not continue
The crack tip stress intensity factor control system module of required direction of control force and size when extension,
Vibration actuator,
To vibration actuator input control signal, starting vibration actuator generates vibration control power and welds railway steel bridge node
The seam random crack tip factor is limited to the random crack propagation in steel threshold range and inhibits system module；
As shown in Figure 3,4, vibration actuator is connected to the lower section of railway steel bridge.It receives random crack propagation and inhibits system mould
The control force instruction that block issues, starter carry out vibration control.
Dynamic displacement data acquisition system module of the invention includes dynamic Bit Shift sensor 1 and Acquisition Instrument 2, moves Bit Shift and passes
Sensor 1 and Acquisition Instrument 2 are mounted on bridge.Dynamic Bit Shift sensor 1 is used to acquire the position on risk symptoms node boundary when train is passed a bridge
It moves and responds and information is passed into Acquisition Instrument 2 by wired mode.In order to obtain accurately and effectively displacement information, Bit Shift is moved
Sensor 1 should be arranged on all connecting rods of risk symptoms node, and according to Saint Venant's principle, should be arranged in the dangerous section of distance
(or left and right) position up and down in the rod piece stress section at point axis centre 2-3m, as shown in Figure 2.Acquisition Instrument is for receiving displacement
Information is amplified etc. and is transferred to wireless receiver 4 by wireless transmitter 3 after processing by the information of sensor.Due to bridge pier
Place is relatively more firm and has larger free space, therefore Acquisition Instrument is arranged on bridge pier, as shown in Figure 2.
Wireless receiver 4 first carries out fault-tolerant, correction processing after receiving displacement information, is then mapped in computer 5
Analysis, as shown in figure 5, computer 5 obtains the displacement of weld seam node cut-boundary and to apply it to finite element software multiple dimensioned
On Shell model 6 in model, it is contemplated that computational efficiency, Shell model 6 are modeled using housing unit.Shell is acquired by analysis
Finite element model response, then cut-boundary displacement apply it on multiple dimensioned physical model 7, wherein multiple dimensioned physical model 7
It is modeled using solid element, the implementation method of cut-boundary displacement is that finite element Sub Model Method carries out rotary insertion on boundary position
Value.The analysis of weld seam node finally is realized to multiple dimensioned physical model 7, to obtain weld seam node dynamic stress, realizes drift index
The mapping of the dynamics index needed to crack Propagation.
Consider that the three-dimensional cracks extensions path analysis center 8 of geometric parameter analyzes available expansion to above-mentioned physical model 7
Open up path and service life.Rain-flow counting is carried out to each rod piece stress time-histories in physical model analysis 7 first, extract stress amplitude compared with
Big numerical value, and each rod piece stress amplitude is synthesized by equivalent stress amplitude Δ σ based on equivalent damage amount methodeq, can be by dynamic stress
Load is converted into static load.Then by equivalent stress amplitude Δ σeqIt is applied in the physical model with three-dimensional cracks, can calculate
Effect stress intensity factor at crack tip out.Cycle-index N is calculated followed by effect stress intensity factor, according to MTS standard
The extension step-length for then acquiring expanded- angle and hypothesis determines next step crack tip, long up to reaching crack propagation repeatedly
Spend af, then each extension can be found out based on the FORMAN formula in fracture mechanics and walk the cycle-index needed, finally split
The extensions path of line and total cycle-index (service life).
Stress intensity factor control centre 9 is according to the determination of threshold of stress intensity factor to above-mentioned extensions path analysis center
8 result is analyzed, if stress intensity factor is excessive, is calculated and is mounted on vibration actuator (vibration control on bridge
Device 10) quantity and power output magnitude numerical value, and issue control instruction.Specifically: full-bridge is write in FORTRAN software first
Shell model program, and Analysis of Vibration Control is completed, the displacement condition of steel bridge node cut-boundary after then being controlled.It should
Displacement condition is applied to extensions path analysis center 8 and is analyzed, and can calculate crack tip stress intensity factor after control,
Its numerical values recited must be less than the numerical value before no control.According to preset stress intensity factor target, and obtain anti-
Feedback, the parameter of continuous adjustment control system optimizes, can finally calculate on bridge the quantity of vibration control apparatus 10 and
Power output size.
Vibration actuator on bridge starts to carry out vibration control after receiving the instruction of stress intensity factor control centre 9
System reduces bridge structure Whole Response, also reduces the stress intensity factor at random crack, it is suppressed that crack propagation.Vibration
Control device can be arranged on the lower boom of steel bridge span centre or response maximum, and the selection of device is multifarious, Ke Yiwei
Active control device, passive control device, semi-automatic control device.There are two types of arrangements, and one is neighbouring in span centre node
Lower boom on be directly suspended tuned mass damper (vertical motion control), such as Fig. 3；Another scheme is under bridge
Damper (horizontal vibration control) is arranged in chord member intermediate lateral, and the steel member for providing moment arm by one is mounted on spanning node
At lower boom, such as Fig. 4.So far inhibition of the system to railway steel bridge node weld seam random crack propagation is realized.
Claims (3)
1. the railway steel bridge node weld seam random crack propagation based on vibration control inhibits system, it is characterised in that: it includes:
The dynamic displacement data acquisition system module of the dynamic displacement response time-histories of acquisition railway steel bridge node region,
By it is collected it is dynamic displacement time course data be changed into dynamic stress time course data displacement-stress mapped system module,
It is real-time by crack tip region acquired in mapping block according to the zigzag geometrical characteristic in initial crack cracking face
Dynamic stress, obtain crack extending length and direction three-dimensional cracks extensions path analysis system module,
The real-time dynamic stress of crack tip region, crack extending length and direction are inputted, analysis crackle is calculated and does not continue to extend
The crack tip stress intensity factor control system module of the direction of control force of Shi Suoxu and size,
Vibration actuator,
To vibration actuator input control signal, starting vibration actuator generate vibration control power by railway steel bridge node weld seam with
The machine crack tip factor is limited to the random crack propagation in steel threshold range and inhibits system module；
Vibration actuator is connected to the lower section of railway steel bridge.
2. the system as claimed in claim 1, it is characterised in that: the vibration actuator is suspended on railway steel bridge lower part.
3. the system as claimed in claim 1, it is characterised in that: vibration actuator setting railway steel bridge lower boom it
Between, and laterally setting.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114253308A (en) * | 2020-09-21 | 2022-03-29 | 陕西环保产业研究院有限公司 | Active control method and device for vibration of space frame structure |
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| CN110285939B (en) | 2020-11-24 |
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