CN107063530A - The measuring method of electric power pylon main material angle steel parasitic moment - Google Patents
The measuring method of electric power pylon main material angle steel parasitic moment Download PDFInfo
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- CN107063530A CN107063530A CN201710228832.2A CN201710228832A CN107063530A CN 107063530 A CN107063530 A CN 107063530A CN 201710228832 A CN201710228832 A CN 201710228832A CN 107063530 A CN107063530 A CN 107063530A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
Abstract
The invention discloses a kind of measuring method of electric power pylon main material angle steel parasitic moment, it is related to main material angle steel parasitic moment measuring method technical field.Methods described comprises the following steps：1) foil gauge is installed；2) foil gauge a and foil gauge b is accessed by deformeter, measurement parasitic moment M using half-bridge connectionzThe bending strain of generationAnd parasitic moment M is calculated according to strain and stress expression formulaz；3) foil gauge a and foil gauge b, foil gauge c and foil gauge d are accessed by deformeter, measurement parasitic moment M using half-bridge connection in two timesyThe bending strain of generationAnd parasitic moment M is calculated according to strain and stress expression formulay.The mode of method of attaching and access deformeter of the present invention based on foil gauge, realize parasitic moment measurement during electric power pylon main material angle steel bias stand under load, have the advantages that measuring method is simple, efficiency high, the parasitic moment measurement of eccentric stand under load angle steel in practical structures can be efficiently applied to.
Description
Technical field
The present invention relates to main material angle steel parasitic moment measuring method technical field, more particularly to a kind of electric power pylon main material angle steel
The measuring method of parasitic moment.
Background technology
Electric power pylon is to use hot rolling equal angle steel component, the space truss structure being bolted mostly.But
Because equal leg angle is mono-symmetry component, and Baogang's axis deviates from each other (as shown in Figure 2) with angle steel axis, is passed from connection limb
Two principal axis of inertia of the power pair cross-section passed have bias, thus angle iron component will be by axial load and due to connection
The collective effect for the parasitic moment that bias is produced.For stressing influence of the research parasitic moment to electric power pylon main material angle steel, it is necessary to calculate
The parasitic moment size of main material angle steel when going out eccentric stand under load.At present, it is not yet found that measurement electric power pylon main material angle steel parasitic moment is big
Small correlation technique.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of high electric power pylon main material angle steel of simple, measurement efficiency
The measuring method of moment of flexure.
In order to solve the above technical problems, the technical solution used in the present invention is：A kind of electric power pylon main material angle steel time is curved
The measuring method of square, it is characterised in that comprise the following steps：
4 foil gauges are pasted in two limbs of electric power pylon main material angle steel, wherein foil gauge a and foil gauge b are pasted onto angle steel
Principal axis of inertia and the limb intersection of angle steel two, are m, foil gauge c and foil gauge d relative to angle steel apart from angle steel summit O' distance
Principal axis of inertia z-axis is arranged symmetrically, and it is n apart from angle steel summit O' distance；
Foil gauge a and foil gauge b is accessed by deformeter, measurement parasitic moment M using half-bridge connectionzThe bending strain of generationAnd parasitic moment M is calculated according to strain and stress expression formulaz, wherein MzRefer to the secondary curved of the main material angle steel principal axis of inertia z-axis
Square；
Foil gauge a and foil gauge b, foil gauge c and foil gauge d are accessed in two times by deformeter using half-bridge connection, surveyed
Measure parasitic moment MyThe bending strain of generationAnd parasitic moment M is calculated according to strain and stress expression formulay, wherein MyRefer to described
The parasitic moment of main material angle steel principal axis of inertia y-axis.
Further technical scheme is：The foil gauge a, foil gauge b, foil gauge c and foil gauge d stickup direction it is equal
Along angle steel axis direction.
Further technical scheme is：Strain-ga(u)ge reading is read using half-bridge connection to comprise the following steps：
Deformeter is accessed using foil gauge a and foil gauge b as abutting end, strain-ga(u)ge reading ε is read1；
Deformeter is accessed using foil gauge a and foil gauge b as opposite end, strain-ga(u)ge reading ε is read2；
Deformeter is accessed using foil gauge c and foil gauge d as opposite end, strain-ga(u)ge reading ε is read3。
Further technical scheme is：The parasitic moment MzComputational methods comprise the following steps：
Measuring point a and b strain expression formula ε are obtained respectivelyaAnd εb；
To measuring point a and b strain expression formula simultaneous solution, parasitic moment M is drawnzThe strain of generation
With reference to strain-ga(u)ge reading ε1And calculation of Bending Moment formula, calculate parasitic moment Mz。
Further technical scheme is：The parasitic moment MzComputational methods comprise the following steps：
Because principal axis of inertia y-axis passes through foil gauge a, b paste position, parasitic moment MyWill not be to being answered at foil gauge paste position
Power produces only axle power P and parasitic moment M in influence, internal forcezThe size of stress at this is influenceed, strain is by two kinds of stretching and bending
Composition composition is strained, i.e.,：
Wherein εP、Represent respectively by the stretching strain produced by stretching, bending, the absolute value of bending strain；
To formula (1) and (2) simultaneous solution, parasitic moment M is drawnzThe strain of generationFor；
Foil gauge b is linked into AB sections of deformeter, foil gauge a is linked into BC sections of deformeter, then the reading of deformeter is：
ε1=εb-εa (4)
Then
Angle iron component is in the presence of eccentric external applied load, there is interior force component present on its cross section：Axle power P, it is secondary curved
Square MyWith parasitic moment Mz；It can be seen from principle of stacking, each point is all uniaxial stressed state on member under an eccentric axial force cross section, and it is surveyed
The theoretical calculation formula of point place direct stress is the algebraical sum of tensile stress and moment of flexure direct stress, i.e.,：
It can be seen from Hooke's law, the survey calculation formula of direct stress is the elastic modulus E and measuring point of material at its measuring point
Locate the product of normal strain, i.e.,：
σ=E ε (7)
According to formula (5), (6) and (7) simultaneous solution, parasitic moment M is calculatedzFor：
Wherein
Then
Further technical scheme is：Parasitic moment MySolution comprise the following steps：
1) measuring point c and d strain expression formula ε are obtained respectivelycAnd εd；
2) to measuring point a, b, c and d strain expression formula εa、εb、εcAnd εdSimultaneous solution, draws parasitic moment MyThe strain of generation
3) strain-ga(u)ge reading ε is combined2And ε3And calculation of Bending Moment formula, calculate parasitic moment My。
Further technical scheme is：Parasitic moment MySolution comprise the following steps：
There are axle power P, parasitic moment M in internal forceyWith parasitic moment MzInfluence the size of stress at foil gauge c and foil gauge d, strain
By stretching and bending two kinds of strain compositions compositions, i.e.,：
Wherein εPRepresent the axial strain that axial stress is produced；Represent parasitic moment MyThe bending strain of generation；Represent
Parasitic moment MzThe bending strain of generation；
By formula (10) and (11) simultaneous solution, parasitic moment M is drawnyThe strain of generationFor：
It can be obtained by formula (1) and (2) simultaneous：
Foil gauge a is linked into AB sections of deformeter, foil gauge b is linked into CD sections of deformeter, the reading for obtaining deformeter is：
ε2=εa+εb (14)
Then
Foil gauge c is linked into AB sections of deformeter, foil gauge d is linked into CD sections of deformeter, the reading for obtaining deformeter is：
ε3=εc+εd (16)
By formula (12), (15) and (16), simultaneous is obtained：
By formula (5), (6) and (17) simultaneous solution, parasitic moment M is calculatedyFor：
Wherein
Then
It is using the beneficial effect produced by above-mentioned technical proposal：Paste position of the methods described based on foil gauge and
The different access way of foil gauge access deformeter, parasitic moment of the power to two principal axis of inertia of angle cross section when calculating eccentric stand under load
Size, has the advantages that measuring method is simple, conventional efficient is high, can be efficiently applied to time of eccentric stand under load angle steel in practical structures
Moment of flexure is measured, to design and the check important of electric power pylon.
Brief description of the drawings
The present invention is further detailed explanation with reference to the accompanying drawings and detailed description.
Fig. 1 is the pieces of cloth schematic diagram of foil gauge in methods described of the embodiment of the present invention；
Fig. 2 is the connection diagram of angle steel and Baogang in the prior art；
Fig. 3 is the schematic diagram of half-bridge connection in methods described of the embodiment of the present invention；
Wherein：1st, the centre of form 2, electric power pylon main material angle steel 3, angle steel principal axis of inertia y 4, angle steel principal axis of inertia z 5, Baogang
6th, bolt hole 7, angle steel axis 8, Baogang's axis 9, eccentric throw.
Embodiment
With reference to the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Ground is described, it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
Many details are elaborated in the following description to facilitate a thorough understanding of the present invention, still the present invention can be with
It is different from other manner described here using other to implement, those skilled in the art can be without prejudice to intension of the present invention
In the case of do similar popularization, therefore the present invention is not limited by following public specific embodiment.
As shown in figures 1 and 3, the embodiment of the invention discloses a kind of measurement side of electric power pylon main material angle steel parasitic moment
Method, comprises the following steps：
4 foil gauges are pasted in two limbs of electric power pylon main material angle steel, wherein foil gauge a and foil gauge b are pasted onto angle steel
Principal axis of inertia and the limb intersection of angle steel two, are m, foil gauge c and foil gauge d relative to angle steel apart from angle steel summit O' distance
Principal axis of inertia z-axis is arranged symmetrically, and it is n apart from angle steel summit O' distance；
Foil gauge a and foil gauge b is accessed by deformeter, measurement parasitic moment M using half-bridge connectionzThe bending strain of generationAnd parasitic moment M is calculated according to strain and stress expression formulaz, wherein MzRefer to the secondary curved of the main material angle steel principal axis of inertia z-axis
Square；
Foil gauge a and foil gauge b, foil gauge c and foil gauge d are accessed in two times by deformeter using half-bridge connection, surveyed
Measure parasitic moment MyThe bending strain of generationAnd parasitic moment M is calculated according to strain and stress expression formulay, wherein MyRefer to described
The parasitic moment of main material angle steel principal axis of inertia y-axis.
Specifically：
Strain-ga(u)ge reading is read using half-bridge connection to comprise the following steps：
Deformeter is accessed using foil gauge a and b as abutting end, strain-ga(u)ge reading ε is read1；
Deformeter is accessed using foil gauge a and b as opposite end, strain-ga(u)ge reading ε is read2；
Deformeter is accessed using foil gauge c and d as opposite end, strain-ga(u)ge reading ε is read3；
Angle iron component is in the presence of eccentric external applied load, there is interior force component present on its cross section：Axle power P, it is secondary curved
Square MyWith parasitic moment Mz。
It can be seen from principle of stacking, each point is all uniaxial stressed state on member under an eccentric axial force cross section, at its measuring point just
The theoretical calculation formula of stress is the algebraical sum of tensile stress and moment of flexure direct stress, i.e.,：
It can be seen from Hooke's law, the survey calculation formula of direct stress is the elastic modulus E and measuring point of material at its measuring point
Locate the product of normal strain, i.e.,：
σ=E ε (2)
As a kind of measuring method of new electric power pylon main material angle steel parasitic moment, half-bridge connection principle is mainly included such as
Lower step：
Collimation method principle is half-and-half bridged with reference to Fig. 3 to illustrate：
When measuring, foil gauge only is connect in the AB sections of electric bridge and BC sections sometimes, and in AD and CD sections of connection deformeter
The equal fixed resistance of two internal resistances.In the case, due to
R1=R2=R R3=R4 ΔR3=Δ R4=0 (3)
So, from formula (3), the output voltage of electric bridge is
Then the reading of deformeter is
Similarly, if connecing foil gauge in the AB sections of electric bridge and CD sections, and two inside AD and BC sections of connection deformeter are hindered
It is worth equal fixed resistance, now the reading of deformeter is：
It is used as a kind of measuring method of new electric power pylon main material angle steel parasitic moment, parasitic moment MzSolution mainly include such as
Lower step：
Foil gauge is pasted at a, b in Fig. 1, and principal axis of inertia y-axis is by strain gauge adhesion position, therefore parasitic moment MyWill
Only axle power P and parasitic moment M in influence, internal force will not be produced on stress at foil gauge paste positionzInfluence the big of stress at this
Small, strain is by stretching and bending two kinds of strain compositions compositions, i.e.,：
Wherein εP、Represent respectively by the stretching strain produced by stretching, bending, the absolute value of bending strain.
To formula (7) and (8) simultaneous solution, parasitic moment M is drawnzThe strain of generationFor；
Such as Fig. 3, foil gauge b is linked into AB sections, foil gauge a is linked into BC sections, then the reading of deformeter is：
ε1=εb-εa (10)
Then
According to formula (1), (2) and (11) simultaneous solution, parasitic moment M is calculatedzFor：
Wherein
Then
Parasitic moment MySolution flow mainly comprise the following steps：
Being pasted in Fig. 1 at c, d in foil gauge, internal force then has axle power P, parasitic moment MyWith parasitic moment MzInfluence stress at this
Size, strain by stretch and bending two kinds strain compositions composition, i.e.,：
Wherein εPRepresent the axial strain of axial stress generation；Represent parasitic moment MyThe bending strain of generation；Represent
Parasitic moment MzThe bending strain of generation；
By formula (14) and (15) simultaneous solution, parasitic moment M is drawnyThe strain of generationFor：
It can be obtained by formula (7) and (8) simultaneous：
Foil gauge a is linked into AB sections, foil gauge b is linked into CD sections, the reading for obtaining deformeter by formula (6) is：
ε2=εa+εb (18)
Then
Foil gauge c is linked into AB sections, foil gauge d is linked into CD sections, the reading for obtaining deformeter by formula (6) is：
ε3=εc+εd (20)
By formula (16), (19) and (20), simultaneous is obtained：
By formula (1), (2) and (21) simultaneous solution, parasitic moment M is calculatedyFor：
Wherein
Then
So far, the parasitic moment suffered by electric power pylon main material angle steel during eccentric stand under load is calculated by 4 foil gauges and finished.
Paste position and foil gauge access deformeter different access way of the methods described based on foil gauge, calculate inclined
Power is to the parasitic moment size of two principal axis of inertia of angle cross section during heart stand under load, with that measuring method is simple, conventional efficient is high etc. is excellent
Point, can be efficiently applied to the parasitic moment measurement of eccentric stand under load angle steel in practical structures, design and check to electric power pylon have
Material impact.
Claims (7)
1. a kind of measuring method of electric power pylon main material angle steel parasitic moment, it is characterised in that comprise the following steps：
4 foil gauges are pasted in two limbs of electric power pylon main material angle steel, wherein foil gauge a and foil gauge b are pasted onto angle steel master and be used to
Property axle and the limb intersection of angle steel two, the distance apart from angle steel summit O' is m, and foil gauge c and foil gauge d are used relative to angle steel master
Property axle z-axis is arranged symmetrically, and it is n apart from angle steel summit O' distance；
Foil gauge a and foil gauge b is accessed by deformeter, measurement parasitic moment M using half-bridge connectionzThe bending strain of generation
And parasitic moment M is calculated according to strain and stress expression formulaz, wherein MzRefer to the parasitic moment of the main material angle steel principal axis of inertia z-axis；
Foil gauge a and foil gauge b, foil gauge c and foil gauge d are accessed by deformeter, measurement time using half-bridge connection in two times
Moment MyThe bending strain of generationAnd parasitic moment M is calculated according to strain and stress expression formulay, wherein MyRefer to the main material
The parasitic moment of angle steel principal axis of inertia y-axis.
2. the measuring method of electric power pylon main material angle steel parasitic moment as claimed in claim 1, it is characterised in that：The foil gauge
A, foil gauge b, foil gauge c and foil gauge d stickup direction are along angle steel axis direction.
3. the measuring method of electric power pylon main material angle steel parasitic moment as claimed in claim 1, it is characterised in that：Using half bridging
Collimation method reads strain-ga(u)ge reading and comprised the following steps：
Deformeter is accessed using foil gauge a and foil gauge b as abutting end, strain-ga(u)ge reading ε is read1；
Deformeter is accessed using foil gauge a and foil gauge b as opposite end, strain-ga(u)ge reading ε is read2；
Deformeter is accessed using foil gauge c and foil gauge d as opposite end, strain-ga(u)ge reading ε is read3。
4. the measuring method of electric power pylon main material angle steel parasitic moment as claimed in claim 3, it is characterised in that the parasitic moment Mz
Computational methods comprise the following steps：
Measuring point a and b strain expression formula ε are obtained respectivelyaAnd εb；
To measuring point a and b strain expression formula simultaneous solution, parasitic moment M is drawnzThe strain of generation
With reference to strain-ga(u)ge reading ε1And calculation of Bending Moment formula, calculate parasitic moment Mz。
5. the measuring method of electric power pylon main material angle steel parasitic moment as claimed in claim 4, it is characterised in that：The parasitic moment
MzComputational methods comprise the following steps：
Because principal axis of inertia y-axis passes through foil gauge a, b paste position, parasitic moment MyStress at foil gauge paste position will not be produced
Only axle power P and parasitic moment M in raw influence, internal forcezThe size of stress at this is influenceed, strain is by two kinds of strains of stretching and bending
Composition is constituted, i.e.,：
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Wherein εP、Represent respectively by the stretching strain produced by stretching, bending, the absolute value of bending strain；
To formula (1) and (2) simultaneous solution, parasitic moment M is drawnzThe strain of generationFor；
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Foil gauge b is linked into AB sections of deformeter, foil gauge a is linked into BC sections of deformeter, then the reading of deformeter is：
ε1=εb-εa (4)
Then
Angle iron component is in the presence of eccentric external applied load, there is interior force component present on its cross section：Axle power P, parasitic moment MyWith
Parasitic moment Mz；It can be seen from principle of stacking, each point is all uniaxial stressed state on member under an eccentric axial force cross section, at its measuring point just
The theoretical calculation formula of stress is the algebraical sum of tensile stress and moment of flexure direct stress, i.e.,：
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It can be seen from Hooke's law, at its measuring point the survey calculation formula of direct stress at elastic modulus E and the measuring point of material just
The product of strain, i.e.,：
σ=E ε (7)
According to formula (5), (6) and (7) simultaneous solution, parasitic moment M is calculatedzFor：
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Wherein
Then
6. the measuring method of electric power pylon main material angle steel parasitic moment according to claim 5, it is characterised in that parasitic moment My
Solution comprise the following steps：
1) measuring point c and d strain expression formula ε are obtained respectivelycAnd εd；
2) to measuring point a, b, c and d strain expression formula εa、εb、εcAnd εdSimultaneous solution, draws parasitic moment MyThe strain of generation
3) strain-ga(u)ge reading ε is combined2And ε3And calculation of Bending Moment formula, calculate parasitic moment My。
7. the measuring method of electric power pylon main material angle steel parasitic moment according to claim 6, it is characterised in that parasitic moment My
Solution comprise the following steps：
There are axle power P, parasitic moment M in internal forceyWith parasitic moment MzInfluence foil gauge c and foil gauge d locate stress size, strain by
Two kinds of strain composition compositions of stretching and bending, i.e.,：
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Wherein εPRepresent the axial strain that axial stress is produced；Represent parasitic moment MyThe bending strain of generation；Represent secondary curved
Square MzThe bending strain of generation；
By formula (10) and (11) simultaneous solution, parasitic moment M is drawnyThe strain of generationFor：
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It can be obtained by formula (1) and (2) simultaneous：
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Foil gauge a is linked into AB sections of deformeter, foil gauge b is linked into CD sections of deformeter, the reading for obtaining deformeter is：
ε2=εa+εb (14)
Then
Foil gauge c is linked into AB sections of deformeter, foil gauge d is linked into CD sections of deformeter, the reading for obtaining deformeter is：
ε3=εc+εd (16)
By formula (12), (15) and (16), simultaneous is obtained：
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<mo>)</mo>
</mrow>
</mrow>
By formula (5), (6) and (17) simultaneous solution, parasitic moment M is calculatedyFor：
<mrow>
<msub>
<mi>M</mi>
<mi>y</mi>
</msub>
<mo>=</mo>
<mfrac>
<mrow>
<mo>(</mo>
<msub>
<mi>&epsiv;</mi>
<mn>3</mn>
</msub>
<mo>-</mo>
<msub>
<mi>&epsiv;</mi>
<mn>2</mn>
</msub>
<mo>)</mo>
<msub>
<mi>EI</mi>
<mi>y</mi>
</msub>
</mrow>
<mrow>
<mn>2</mn>
<mi>z</mi>
</mrow>
</mfrac>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>18</mn>
<mo>)</mo>
</mrow>
</mrow>
Wherein
Then
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201953132U (en) * | 2011-02-09 | 2011-08-31 | 中国电力工程顾问集团东北电力设计院 | Lattice reinforced steel tube single-pole tower |
| CN202416968U (en) * | 2011-12-30 | 2012-09-05 | 华北电力大学（保定） | Lattice angle iron power transmission tower body |
| CN102968542A (en) * | 2012-12-12 | 2013-03-13 | 河北省电力勘测设计研究院 | Method for performing structure analysis on steel pylon by using ANSYS software |
| CN106294917A (en) * | 2015-06-10 | 2017-01-04 | 中国电力科学研究院 | A kind of adjustment method of the column foot plate of power transmission tower |
-
2017
- 2017-04-10 CN CN201710228832.2A patent/CN107063530B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201953132U (en) * | 2011-02-09 | 2011-08-31 | 中国电力工程顾问集团东北电力设计院 | Lattice reinforced steel tube single-pole tower |
| CN202416968U (en) * | 2011-12-30 | 2012-09-05 | 华北电力大学（保定） | Lattice angle iron power transmission tower body |
| CN102968542A (en) * | 2012-12-12 | 2013-03-13 | 河北省电力勘测设计研究院 | Method for performing structure analysis on steel pylon by using ANSYS software |
| CN106294917A (en) * | 2015-06-10 | 2017-01-04 | 中国电力科学研究院 | A kind of adjustment method of the column foot plate of power transmission tower |
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