CN109214033B - Method and device for evaluating deformation of storage tank after foundation settlement - Google Patents
Method and device for evaluating deformation of storage tank after foundation settlement Download PDFInfo
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Abstract
The embodiment of the invention discloses a method and a device for evaluating deformation of a storage tank after foundation settlement, wherein the method comprises the following steps: acquiring settlement data of a storage tank foundation, wherein the settlement data comprises a settlement amount and a circumferential angle; fitting the settlement data through a Fourier series expression to obtain a harmonic amplitude and a phase angle after fitting; obtaining a radial deformation value to be evaluated of the tank wall of the storage tank according to the harmonic amplitude, the phase angle and a preset radial deformation calculation formula; and obtaining and displaying a judgment result according to the radial deformation value to be evaluated of the wall of the storage tank and a preset rule. According to the method and the device for evaluating deformation of the storage tank after foundation settlement, provided by the embodiment of the invention, after the foundation of the storage tank is settled, the settlement data of the foundation is collected, the radial deformation of the wall of the storage tank is calculated and obtained based on the settlement data, and then whether the storage tank is qualified or not is evaluated.
Description
Technical Field
The embodiment of the invention relates to the technical field of petrochemical industry, in particular to a method and a device for evaluating deformation of a storage tank after foundation settlement.
Background
The sites of petroleum reserve bases in China are mostly coastal areas of east, and because the soil quality of the areas is soft and the large-scale oil tank load is added, the foundations often have uneven settlement. The settlement will cause the tank wall to generate non-rounding phenomenon, even cause the failure of the floating disc chuck, the tilting disc and the sealing device, and most possibly cause the accidents of oil leakage, lightning strike and ignition and the like.
In order to ensure the safe and smooth operation of the storage tank, national standards such as API 653, EEMUA 159 and SY/T5921 all require that the tank wall deformation evaluation is carried out on the oil tank, and if the API 653 requires that the distance between the floating disc and the tank wall is less than 100 mm.
In the process of implementing the embodiment of the invention, the inventor finds that the cylindricity of the wall of the oil tank is mainly obtained by adopting a field measurement mode at present, and common tank wall deformation measurement methods comprise a girth gauge method, an optical reference line method and an internal photoelectric distance measurement method. By adopting the field measurement method, the labor intensity of detection personnel is high, the operation environment is dangerous, the measurement efficiency is low, and the error is large.
Disclosure of Invention
The method and the device for evaluating the deformation of the storage tank after the foundation settlement are used for solving the problems of high labor intensity of detection personnel, dangerous operation environment, low measurement efficiency and large error caused by the fact that the cylindricity of the wall of the storage tank is obtained by adopting a manual measurement mode in the prior art.
In a first aspect, an embodiment of the present invention provides a method for evaluating deformation of a storage tank after foundation settlement, including:
acquiring settlement data of a storage tank foundation, wherein the settlement data comprises a settlement amount and a circumferential angle;
fitting the settlement data through a Fourier series expression to obtain a harmonic amplitude and a phase angle after fitting;
obtaining a radial deformation value to be evaluated of the tank wall of the storage tank according to the harmonic amplitude, the phase angle and a preset radial deformation calculation formula;
and obtaining and displaying a judgment result according to the radial deformation value to be evaluated of the wall of the storage tank and a preset rule.
Optionally, the fourier series expression is:
wherein u is the sedimentation amount, theta is the circumferential angle, theta is more than or equal to 0 and less than or equal to 2 pi, and u0Is the overall uniform settlement of the foundation, unIs the amplitude of the nth order harmonic precipitation, n is the harmonic number,
is the phase angle of the nth order harmonic at the time of superposition,
optionally, the obtaining a value of radial deformation to be evaluated of the tank wall of the storage tank according to the harmonic amplitude, the phase angle and a preset radial deformation calculation formula includes:
obtaining a calculation formula of a corresponding order from the radial deformation calculation formula according to different orders;
obtaining a radial deformation value under the corresponding order according to a calculation formula under the corresponding order, the harmonic amplitude and the phase angle;
superposing the radial deformation values under different orders to obtain a radial deformation curve of the tank wall after the foundation settlement;
and obtaining a radial deformation value to be evaluated according to the radial deformation curve.
Optionally, the obtaining and displaying a judgment result according to the to-be-evaluated radial deformation value of the tank wall of the storage tank and a preset rule includes:
if the radial deformation value to be evaluated is smaller than the preset value, judging that the deformation of the storage tank does not exceed the standard according to the evaluation result, and displaying that the storage tank is qualified; otherwise, the judgment result is that the deformation of the storage tank exceeds the standard, and the storage tank is displayed to be unqualified.
Optionally, the obtaining settlement data of the foundation of the storage tank comprises: setting a vertical displacement observation point on the edge of the storage tank foundation, setting a horizontal displacement side pile at the position of the vertical displacement observation point, and collecting settlement data at the position of the horizontal displacement side pile by adopting a level gauge.
In a second aspect, an embodiment of the present invention provides an apparatus for evaluating deformation of a storage tank after foundation settlement, including:
the system comprises an acquisition module, a storage tank and a control module, wherein the acquisition module is used for acquiring settlement data of a storage tank foundation, and the settlement data comprises settlement and a circumferential angle;
the fitting module is used for fitting the settlement data through a Fourier series expression to obtain the harmonic amplitude and the phase angle after fitting;
the calculation module is used for obtaining a radial deformation value to be evaluated of the storage tank wall according to the harmonic amplitude, the phase angle and a preset radial deformation calculation formula;
and the judging module is used for obtaining and displaying a judging result according to the radial deformation value to be evaluated of the tank wall of the storage tank and a preset rule.
Optionally, the fourier series expression is:
wherein u is the sedimentation amount, theta is the circumferential angle, theta is more than or equal to 0 and less than or equal to 2 pi, and u0Is the overall uniform settlement of the foundation, unIs the amplitude of the nth order harmonic precipitation, n is the harmonic number,
is the phase angle of the nth order harmonic at the time of superposition,
optionally, the calculation module is specifically configured to:
obtaining a calculation formula of a corresponding order from the radial deformation calculation formula according to different orders;
obtaining a radial deformation value under the corresponding order according to a calculation formula under the corresponding order, the harmonic amplitude and the phase angle;
superposing the radial deformation values under different orders to obtain a radial deformation curve of the tank wall after the foundation settlement;
and obtaining a radial deformation value to be evaluated according to the radial deformation curve.
Optionally, the determining module is specifically configured to:
if the radial deformation value to be evaluated is smaller than the preset value, judging that the deformation of the storage tank does not exceed the standard according to the evaluation result, and displaying that the storage tank is qualified; otherwise, the judgment result is that the deformation of the storage tank exceeds the standard, and the storage tank is displayed to be unqualified.
Optionally, the obtaining module is specifically configured to: and carrying out data transmission with a level gauge arranged at a vertical displacement observation point on the edge of the storage tank foundation to obtain foundation settlement data.
According to the technical scheme, the method and the device for evaluating the deformation of the storage tank after the foundation subsides, provided by the embodiment of the invention, have the advantages of high evaluation efficiency and high evaluation precision compared with the manual measurement mode in the prior art.
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The features and advantages of the present invention will be more clearly understood by reference to the accompanying drawings, which are illustrative and not to be construed as limiting the invention in any way, and in which:
FIG. 1 is a schematic flow chart of a method for evaluating deformation of a storage tank after foundation settlement according to example 1 of the present invention;
FIG. 2 is a schematic diagram illustrating a finite element model of a foundation settling tank according to an embodiment of the present invention;
FIG. 3 is a graph showing radial deformation of a storage tank after single harmonic settlement of a foundation according to an embodiment of the present invention;
FIG. 4 is a graph illustrating the magnitude of single harmonic settlement of a foundation as a function of radial deformation of a tank wall provided by an embodiment of the present invention;
FIG. 5 is a graph illustrating radial deformation of a tank after foundation settlement provided by an embodiment of the present invention;
fig. 6 is a schematic structural diagram illustrating a tank deformation evaluation apparatus after foundation settlement according to example 2 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Fig. 1 is a schematic flow chart of a method for evaluating deformation of a storage tank after foundation settlement according to embodiment 1 of the present invention, and referring to fig. 1, the method may be implemented by a processor, and specifically includes the following steps:
s11, obtaining settlement data of the foundation of the storage tank, wherein the settlement data comprises a settlement amount and a circumferential angle.
In this step, it should be noted that, in the embodiment of the present invention, for the collection of the settlement data, a vertical displacement observation point is set on the edge of the storage tank foundation, a horizontal displacement side pile is set at the vertical displacement observation point, and a level is used to collect the settlement data at the horizontal displacement side pile.
The positions and the number of the set observation points can be determined according to the model of the storage tank and the observation precision requirement, and the observation points are set on the outer circumferential surface of the foundation.
And S12, fitting the settlement data through a Fourier series expression to obtain the fitted harmonic amplitude and phase angle.
In this step, it should be noted that, in the embodiment of the present invention, after the settlement data acquired in step S11 is acquired, the fitting processing is performed on the settlement data through a fourier series expression, so as to obtain the fitted harmonic amplitude and phase angle.
Wherein the Fourier series expression is:
wherein u is the sedimentation amount, theta is the circumferential angle, theta is more than or equal to 0 and less than or equal to 2 pi, and u0Is the overall uniform settlement of the foundation, unIs the amplitude of the nth order harmonic precipitation, n is the harmonic number,
is the phase angle of the nth order harmonic at the time of superposition,
in the embodiment of the present invention, the harmonic number n can be set according to the specific situation. When the storage tank foundation settlement is evaluated, the combined harmonic within 6 times can well reflect the authenticity and regularity of the actual settlement of the foundation, so that the total number of the harmonic suitable for the storage tank foundation settlement can be 6. Meanwhile, the influence of integral uniform sedimentation (n is 0) and plane inclination (n is 1) on the deformation of the tank wall is small and can be ignored, so that n is more than or equal to 2 and less than or equal to 6.
In the step, a plurality of collected settlement data are substituted into a Fourier series expression to obtain a plurality of equations, and the equations are solved to obtain the fitted harmonic amplitude and phase angle. It should be noted that this calculation is based on a processor.
And S13, obtaining the radial deformation value to be evaluated of the storage tank wall according to the harmonic amplitude, the phase angle and a preset radial deformation calculation formula.
In this step, it should be noted that, in the embodiment of the present invention, the proposed radial deformation calculation formula is preset in the processor, and therefore, the obtaining of the radial deformation calculation formula is explained first, and specifically, the following may be performed:
at 10X 104m3Large external floating roofFor example, a cylindrical crude oil storage tank has a nominal diameter of 80m, a tank wall height of 21.8m, and a design liquid level height of 19.8 m.
1) Obtaining material parameters of the tank
Specifically, the parameters include: tensile strength σ of the MaterialbYield strength σyAnd elastic modulus E. The above parameters can be obtained by a metal tensile test.
2) Determining constitutive relation of materials
Determining the constitutive relation of the equivalent stress sigma and the equivalent strain epsilon of the material by adopting a Ramberg-Osgood model in a formula (1) according to the basic parameters obtained in the step 1:
in the formula: epsilonyElastic strain at yield point, epsilony＝σy/E；σyIs the yield stress; e is the elastic modulus, and E is 2.06 multiplied by 105 MPa; alpha is a hardening coefficient, alpha is plastic strain at a yield point/elastic strain at the yield point, and the plastic strain at the yield point is 0.2%; m is the power hardening exponent. Specific values for the three materials used in the tank are shown in table 1.
The material power hardening exponent m is obtained by the formula (2):
TABLE 1 storage tank Material parameters
3) Establishing a finite element full model of the large non-anchored variable-wall-thickness storage tank
The main structure and material parameters of the storage tank are shown in Table 2. According to the physical property and the geometrical characteristic of the storage tank, the influence of all accessories such as wall-surrounding type foundation, variable wall thickness, reinforcing rings and rib plates, wind-resistant rings and supports, edge-covered angle steel and the like is simultaneously considered, wherein the wind-resistant rings and the rib platesThe supporting ring, the reinforcing ring and the rib plate are modeled according to actual geometric structures, and a finite element full model of the large non-anchored variable-wall-thickness storage tank is established. As shown in fig. 2. The method comprises the steps that a contact unit is adopted to simulate the interaction between a storage tank bottom plate and a foundation, the contact unit is applied to all areas where the storage tank bottom plate is in contact with the foundation, a storage tank wall plate, a storage tank bottom plate, a wind-resistant ring, a reinforcing ring and a rib plate are simulated through a 4-node shell unit, the support of a tank wall top layer edge-covering angle steel and the wind-resistant ring is simulated through a beam unit, and an 8-node entity unit with different elasticity moduli is adopted to simulate the annular wall type foundation of the storage tank; the elastic moduli of the reinforced concrete ring wall and the sand foundation are respectively 2 multiplied by 1010Pa、1.6×107Pa. After the model is established, the storage tank and the foundation are respectively subjected to grid division.
Table 210 × 104m3Structural parameters of storage tank
4) Setting of boundary conditions and application of load
Setting of boundary conditions and application of load: the annular and radial displacements of the nodes on the lower surface of the storage tank foundation are zero, and the axial displacement of the nodes on the outer edge of the foundation is a single harmonic u-u expressed by Fourier seriesnThe settling amount of cos (n theta) is assumed to be 40mm (u is the settling amplitude of 2-6 times of foundation harmonic waves2＝u3＝u4＝u5＝u6And 40), the axial displacement of the central node is the average value of the axial displacements of the outer edge nodes, and the axial displacement values of the rest nodes linearly change along the radial direction. The hydrostatic pressure load (H19.8 m) is applied to the bottom plate and the wall plate of the storage tank, the dead weight load of the tank body and all accessories is applied, and the steel density is 7850kg/m3。
The hydrostatic pressure is distributed in a triangular linear mode from the liquid level to the bottom of the tank, gradually increases from top to bottom, and is added to a wall plate and a bottom plate of the tank in a mode of uniformly distributing loads, and the expression of the hydrostatic pressure is as follows:
p＝ρg(H-z)
wherein p is hydrostatic pressure, Pa; rho is stock solution density, kg/m3(ii) a g is the gravity acceleration, N/kg; h is the height of the liquid in the storage tank, m; z is the axial distance, m, from the tank floor.
5) Performing numerical solution
And (4) selecting a proper algorithm to solve the stress and deformation of the storage tank after the foundation settlement. Wherein the coefficient of friction between the tank floor and the foundation is taken to be 0.2.
6) Radial deformation of the tank wall at the maximum level
Obtaining the single harmonic settlement u-u of the foundation according to the solving data of 5)nRadial deformation data of the tank wall at the float caused by cos (n θ) at the highest liquid level, as shown in fig. 3 and 4. FIG. 3 is a radial deformation curve diagram of a storage tank after single harmonic settlement of a foundation, and FIG. 4 is a relation diagram of single harmonic settlement amplitude of the foundation and radial deformation of a tank wall.
According to the obtained curve diagram, after the foundation subsides, the form of the calculation formula of the radial deformation of the storage tank is
The form is set according to fig. 3. In the formula, the coefficient K under each harmonic ordernIs the amplitude unThe specific form of the function of (2) is determined according to fig. 4.
Therefore, the radial deformation calculation formula mentioned in the embodiment of the present invention is obtained by performing simulation test calculation based on a finite element full model.
Therefore, the step S13 may specifically be:
s131, obtaining a calculation formula of the corresponding order from the radial deformation calculation formula according to different orders.
S132, obtaining a radial deformation value under the corresponding order according to a calculation formula under the corresponding order, the harmonic amplitude and the phase angle;
s133, superposing the radial deformation values under different orders to obtain a radial deformation curve of the tank wall after foundation settlement;
and S134, obtaining a radial deformation value to be evaluated according to the radial deformation curve.
In contrast, it should be noted that, because coefficients at different harmonic orders are different, calculation formulas corresponding to the orders need to be obtained at different orders, radial deformation values at the corresponding orders are obtained according to the calculation formulas at the corresponding orders and the harmonic amplitudes and phase angles obtained in step S12, the radial deformation values at the single orders are superposed to obtain a radial deformation curve of the tank wall after the foundation combination harmonic subsides, and then the maximum value of the absolute peak value is found from the radial deformation curve, where the maximum value is the radial deformation value to be evaluated.
And S14, obtaining and displaying a judgment result according to the radial deformation value to be evaluated of the tank wall of the storage tank and a preset rule.
In this step, it should be noted that if the radial deformation value to be evaluated is smaller than the preset value, the evaluation result indicates that the deformation of the storage tank does not exceed the standard, and the storage tank is qualified; otherwise, the judgment result is that the deformation of the storage tank exceeds the standard, and the storage tank is displayed to be unqualified.
The following examples illustrate embodiments of the invention:
with a certain oil depot of 10X 104m3The large-scale external floating roof vertical cylindrical crude oil storage tank is a research object, the nominal diameter is 80m, the height of the tank wall is 21.8m, and the height of the designed liquid level is 19.8 m. The evaluation procedure is shown in fig. 1, and specifically comprises the following steps:
1. carrying out settlement observation on the foundation of the storage tank to obtain the settlement
And manually observing the foundation settlement by adopting a precision level gauge according to 24 preset vertical settlement observation points and observation horizontal displacement side columns during the construction of the storage tank, wherein the measurement precision is II-level leveling, and the foundation settlement is obtained. The sedimentation amount of the storage tank is maximum under the full load condition, and a basic sedimentation observation value under the highest liquid level is selected for safety. The measurement results are shown in Table 3.
TABLE 3 cumulative settlement observation data (mm) of storage tank foundation
| Measuring point | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
| Amount of sedimentation | 242 | 236 | 238 | 250 | 259 | 287 | 306 | 336 | 362 | 392 | 418 | 425 |
| Measuring point | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 |
| Amount of sedimentation | 430 | 429 | 431 | 434 | 410 | 388 | 347 | 297 | 268 | 249 | 249 | 237 |
2. Harmonic fitting of foundation settlement
And expanding the actually measured discrete data of the sedimentation of the foundation of the storage tank into a form of combination of a plurality of orders of harmonic waves through Fourier series to obtain a fitting formula of the sedimentation. The Fourier series expression is as follows:
in the formula: n represents the harmonic number; u. of0Representing the overall uniform settling of the tank; n-1 represents the overall inclination of the tank; u. ofnIs the amplitude of the nth order harmonic settlement;
is the initial phase angle of the nth order harmonic at the time of superposition,
because the combined harmonic within 6 times can well reflect the authenticity and regularity of the actual settlement of the foundation, n is less than or equal to 6.
According to table 3, the Fourier fitting results of the measured settlement of the tank foundation are shown in table 4.
TABLE 4 Fourier decomposition of tank settling data (u)n/mm，
)
3. Calculating the radial deformation of the tank wall under the foundation settlement according to the following formula
For 10 x 104m3According to the large-scale storage tank, the radial deformation calculation formula of the tank wall at the floating plate caused by the foundation combination harmonic settlement under the highest liquid level is as follows:
in the formula, y is the radial deformation of the tank wall at the highest liquid level, and is mm; k is a radical ofnThe coefficients are corresponding to the formula (5) to the formula (9); u. ofn、
Carrying out Fourier fitting on actually measured data to obtain a harmonic amplitude and a phase angle; theta is a circumferential angle, and theta is more than or equal to 0 and less than or equal to 2 pi. Because the influence of integral uniform sedimentation and plane inclination on the deformation of the tank wall is small and can be ignored, n is more than or equal to 2 and less than or equal to 6.
n＝2：
n＝3：
n＝4：
n＝5：
n＝6：
By substituting the data in table 4 into the corresponding formula (4), the deformation curve of the tank wall at the highest liquid level after the foundation subsides can be obtained, as shown in fig. 5.
4. Tank wall deformation evaluation
Obtaining the maximum value of the absolute value of the radial deformation y of the tank wall at the highest liquid level, evaluating the operation safety of the storage tank according to the regulation of the tank wall deformation in the standard, and evaluating the criterion: the distance between the floating plate and the wall of the tank, i.e. the value of y, should be less than 100 mm. If the standard is not exceeded, the operation is safe, and the operation can be continued. If the standard exceeds the standard, the corresponding processing is required.
According to the step 3, the absolute value of the maximum deformation value of the tank wall obtained by the formula is 80.3mm (as shown in figure 5), and is less than 100mm, so that the deformation evaluation result of the settling tank does not exceed the standard, the settling tank belongs to safe operation, and the settling tank can be continuously used.
According to the method for evaluating deformation of the storage tank after foundation settlement, provided by the embodiment 1 of the invention, after the foundation of the storage tank is settled, the settlement data of the foundation is collected, the radial deformation of the wall of the storage tank is calculated and obtained based on the settlement data, and then whether the storage tank is qualified or not is evaluated.
Fig. 6 is a schematic structural diagram illustrating an apparatus for evaluating deformation of a storage tank after settlement of a foundation according to example 2 of the present invention, referring to fig. 6, the apparatus comprising: an obtaining device 21, a fitting module 22, a calculating module 23 and a judging module 24, wherein:
the acquiring module 21 is configured to acquire settlement data of a storage tank foundation, where the settlement data includes a settlement amount and a circumferential angle;
the fitting module 22 is configured to perform fitting processing on the settlement data through a fourier series expression to obtain a harmonic amplitude and a phase angle after fitting;
the calculation module 23 is configured to obtain a radial deformation value to be evaluated of the tank wall of the storage tank according to the harmonic amplitude, the phase angle, and a preset radial deformation calculation formula;
and the judging module 24 is used for obtaining and displaying a judging result according to the radial deformation value to be evaluated of the tank wall of the storage tank and a preset rule.
Since the principle of the apparatus according to embodiment 2 of the present invention is the same as that of the method according to the above embodiment, further details are not repeated herein for further explanation.
It should be noted that, the embodiment of the present invention may implement the relevant functional module through a hardware processor (hardware processor).
According to the deformation evaluation device for the storage tank after the foundation subsides, provided by the embodiment 2 of the invention, after the foundation of the storage tank subsides, the subsidence data of the foundation are collected, the radial deformation of the wall of the storage tank is obtained through calculation based on the subsidence data, and then whether the storage tank is qualified or not is evaluated.
It should be noted that, in the respective components of the apparatus of the present invention, the components therein are logically divided according to the functions to be implemented thereof, but the present invention is not limited thereto, and the respective components may be newly divided or combined as necessary.
Various component embodiments of the invention may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. In the device, the PC remotely controls the equipment or the device through the Internet, and accurately controls each operation step of the equipment or the device. The present invention may also be embodied as apparatus or device programs (e.g., computer programs and computer program products) for performing a portion or all of the methods described herein. The program for realizing the invention can be stored on a computer readable medium, and the file or document generated by the program has statistics, generates a data report and a cpk report, and the like, and can carry out batch test and statistics on the power amplifier. It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A deformation evaluation method of a storage tank after foundation settlement is characterized by comprising the following steps:
acquiring settlement data of a storage tank foundation, wherein the settlement data comprises a settlement amount and a circumferential angle;
fitting the settlement data through a Fourier series expression to obtain a harmonic amplitude and a phase angle after fitting;
obtaining a radial deformation value to be evaluated of the tank wall of the storage tank according to the harmonic amplitude, the phase angle and a preset radial deformation calculation formula;
obtaining and displaying a judgment result according to the radial deformation value to be evaluated of the wall of the storage tank and a preset rule;
the preset radial deformation calculation formula is obtained by performing simulation experiment calculation based on a finite element full model, and comprises the following steps:
where y is the radial deformation value, n is the harmonic number, θ is the circumferential angle,
is the phase angle of the nth order harmonic when superimposed,
knis the amplitude u of the nth order harmonic precipitationnAs a function of (c).
2. The method of claim 1, wherein the fourier series expression is:
wherein u is the sedimentation amount, theta is the circumferential angle, theta is more than or equal to 0 and less than or equal to 2 pi, and u0Is the overall uniform settlement of the foundation, unIs the amplitude of the nth order harmonic precipitation, n is the harmonic number,
is the phase angle of the nth order harmonic at the time of superposition,
3. the method according to claim 1, wherein the obtaining a value of the radial deformation to be evaluated of the tank wall of the storage tank according to the harmonic amplitude, the phase angle and a preset radial deformation calculation formula comprises:
according to different orders, obtaining a calculation formula corresponding to the order from the radial deformation calculation formula;
obtaining a radial deformation value under the corresponding order according to a calculation formula under the corresponding order, the harmonic amplitude and the phase angle;
superposing the radial deformation values under different orders to obtain a radial deformation curve of the tank wall after the foundation settlement;
and obtaining a radial deformation value to be evaluated according to the radial deformation curve.
4. The method according to claim 3, wherein the obtaining and displaying of the evaluation result according to the radial deformation value to be evaluated of the tank wall and the preset rule comprises:
if the radial deformation value to be evaluated is smaller than the preset value, judging that the deformation of the storage tank does not exceed the standard according to the evaluation result, and displaying that the storage tank is qualified; otherwise, the judgment result is that the deformation of the storage tank exceeds the standard, and the storage tank is displayed to be unqualified.
5. The method of claim 1, wherein the obtaining settlement data for the foundation of the storage tank comprises: setting a vertical displacement observation point on the edge of the storage tank foundation, setting a horizontal displacement side pile at the position of the vertical displacement observation point, and collecting settlement data at the position of the horizontal displacement side pile by adopting a level gauge.
6. A deformation evaluation device for a storage tank after foundation settlement is characterized by comprising:
the system comprises an acquisition module, a storage tank and a control module, wherein the acquisition module is used for acquiring settlement data of a storage tank foundation, and the settlement data comprises settlement and a circumferential angle;
the fitting module is used for fitting the settlement data through a Fourier series expression to obtain the harmonic amplitude and the phase angle after fitting;
the calculation module is used for obtaining a radial deformation value to be evaluated of the storage tank wall according to the harmonic amplitude, the phase angle and a preset radial deformation calculation formula;
the judging module is used for obtaining and displaying a judging result according to the radial deformation value to be evaluated of the tank wall of the storage tank and a preset rule;
the preset radial deformation calculation formula is obtained by performing simulation experiment calculation based on a finite element full model, and comprises the following steps:
where y is the radial deformation value, n is the harmonic number, θ is the circumferential angle,
is the phase angle of the nth order harmonic when superimposed,
knis the amplitude u of the nth order harmonic precipitationnAs a function of (c).
7. The apparatus of claim 6, wherein the Fourier series expression is:
wherein u is the sedimentation amount, theta is the circumferential angle, theta is more than or equal to 0 and less than or equal to 2 pi, and u0Is the overall uniform settlement of the foundation, unIs the amplitude of the nth order harmonic precipitation, n is the harmonic number,
is the phase angle of the nth order harmonic at the time of superposition,
8. the apparatus of claim 6, wherein the computing module is specifically configured to:
according to different orders, obtaining a calculation formula corresponding to the order from the radial deformation calculation formula;
obtaining a radial deformation value under the corresponding order according to a calculation formula under the corresponding order, the harmonic amplitude and the phase angle;
superposing the radial deformation values under different orders to obtain a radial deformation curve of the tank wall after the foundation settlement;
and obtaining a radial deformation value to be evaluated according to the radial deformation curve.
9. The apparatus of claim 6, wherein the determining module is specifically configured to:
if the radial deformation value to be evaluated is smaller than the preset value, judging that the deformation of the storage tank does not exceed the standard according to the evaluation result, and displaying that the storage tank is qualified; otherwise, the judgment result is that the deformation of the storage tank exceeds the standard, and the storage tank is displayed to be unqualified.
10. The apparatus of claim 6, wherein the obtaining module is specifically configured to: and carrying out data transmission with a level gauge arranged at a vertical displacement observation point on the edge of the storage tank foundation to obtain foundation settlement data.
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| CN111811844A (en) * | 2019-04-11 | 2020-10-23 | 中国石油天然气集团有限公司 | Storage tank settlement testing device and method for testing tank wall change |
| CN110348040B (en) * | 2019-05-21 | 2022-09-27 | 合肥通用机械研究院有限公司 | Mean square convergence condition-based non-uniform settlement function fitting method |
| CN112257299A (en) * | 2019-07-05 | 2021-01-22 | 中国石油化工股份有限公司 | Method and device for acquiring buckling critical pressure stress of storage tank |
| CN110824018B (en) * | 2019-11-12 | 2022-05-27 | 宁波市劳动安全技术服务公司 | Risk assessment and safety detection evaluation method for atmospheric storage tank |
| CN115854976B (en) * | 2021-12-21 | 2024-01-23 | 中集安瑞科工程科技有限公司 | Sedimentation observation device and method for low-temperature storage tank |
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