Information processing system, information processing method, and program

Abstract

To provide an information processing system capable of easily computing indicators pertaining to damage of a plurality of different tanks with simpler preparation.SOLUTION: A value indicated by a peak of a lifting displacement waveform at a corner near a weld caused by vibration of a tank formed by welding a side plate to a bottom plate, and a coefficient corresponding to the tank are input to a corner strain calculation formula to derive corner strain near the weld.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] This disclosure relates to an information processing system, an information processing method, and a program.

Background Art

[0002] Tanks for storing objects such as oil may be deformed by vibrations such as seismic vibrations. For example, bulging, which is the vibration of the main body of the tank side plate caused by short-period seismic vibrations (high-frequency vibrations), and sloshing, which is the swaying of the liquid surface caused by long-period seismic vibrations (low-frequency vibrations), occur. In addition, rocking vibrations occur in which the tank vibrates laterally due to horizontal inertial forces caused by short-period seismic vibrations (high-frequency vibrations), and the corner portions indicating the vicinity of the joint between the side plate and the bottom plate constituting the tank lift off the ground, and this is known to be one of the main causes of damage to the tank during the occurrence of vibrations such as earthquakes.

[0003] As something for estimating such damage to the tank, a soundness evaluation system (SUSTAINER) for oil tanks has been developed. Also, related technologies are disclosed in Patent Document 1.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, tanks as described above may differ in size and the object stored inside. There is a need for a technology that can easily calculate indices related to the damage of these different multiple tanks with simpler preparation.

[0006] This disclosure aims to provide an information processing system, an information processing method, and a program that solve the above problems.

Means for Solving the Problem

[0007] According to the first aspect of this disclosure, an information processing system inputs a value indicated by a peak of a lifting displacement waveform of a corner portion indicating the vicinity of a joint portion between a side plate and a bottom plate constituting a tank due to vibration and a coefficient corresponding to the tank into a corner portion strain calculation formula, and includes a corner portion strain calculation unit that calculates the corner portion strain at the corner portion.

[0008] According to the second aspect of this disclosure, an information processing method inputs a value indicated by a peak of a lifting displacement waveform of a corner portion indicating the vicinity of a joint portion between a side plate and a bottom plate constituting a tank due to vibration and a coefficient corresponding to the tank into a corner portion strain calculation formula, and includes a corner portion strain calculation unit that calculates the corner portion strain at the corner portion.

[0009] According to the third aspect of this disclosure, a program causes a computer of an information processing system to function as a corner portion strain calculation means that inputs a value indicated by a peak of a lifting displacement waveform of a corner portion indicating the vicinity of a joint portion between a side plate and a bottom plate constituting a tank due to vibration and a coefficient corresponding to the tank into a corner portion strain calculation formula, and calculates the corner portion strain at the corner portion.

Advantages of the Invention

[0010] It is possible to provide an information processing system that can easily calculate indices related to damage of a plurality of different tanks with simpler preparation.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Mode for Carrying Out the Invention

[0012] FIG. 1 is a schematic configuration diagram of an information processing system according to an embodiment of this disclosure. As shown in FIG. 1, the information processing system 100 of this disclosure includes an information processing apparatus 10. The information processing system 100 also includes information processing apparatuses other than the information processing apparatus 10. In other information processing apparatuses, using the data input with the information obtained from seismographs and other sensors, ground motion observation recording processing, ground motion calculation processing for each tank, damage evaluation of the side plates and bottom plates of the tank, sloshing influence evaluation, wave height, overflow of the object enclosed in the tank, calculation of the damage degree of the floating roof, etc. are performed. These processing results are stored in the tank calculation result DB 30. In the ground motion DB 20 for each tank, the ground motion calculation results for each tank calculated by other information processing apparatuses are recorded.

[0013] The information processing device 10 obtains the earthquake motion waveform, which is the calculation result of the earthquake motion of the target tank, from the tank-specific earthquake motion DB 20. The information processing device 10 also obtains the coefficients related to the target tank from a predetermined storage unit. The information processing device 10 inputs the value indicated by the peak of the uplift displacement waveform of the corner part, which indicates the vicinity of the joint between the side plate and the bottom plate that constitute the tank due to vibration, and the coefficient corresponding to the tank, into a corner part strain calculation formula, and calculates the corner part strain at the corner part.

[0014] In the past, when calculating corner strain, it was necessary to calculate the corner strain for each tank using the finite element method. However, the method of the information processing device 10 of the present disclosure makes it possible to easily calculate corner strain for tanks of any size or storage object without prior preparation for the finite element method or extensive processing using the finite element method.

[0015] FIG. 2 is a hardware configuration diagram of the information processing device. 2, the information processing device 10 is a computer including various pieces of hardware such as a central processing unit (CPU) 101, a read only memory (ROM) 102, a random access memory (RAM) 103, a hard disk drive (HDD) 104, and a communication module 105. The information processing system 100 may be configured using a plurality of information processing devices 10. In other words, the other information processing devices are also computers similar to the information processing device 10.

[0016] FIG. 3 is a functional block diagram of the information processing device. The CPU 101 of the information processing device 10 executes the tank management program. As a result, the information processing device 10 exhibits the functions of an acquisition unit 11, an uplift displacement calculation unit 12, a corner strain calculation unit 13, a strain amplitude calculation unit 14, a cumulative damage calculation unit 15, and an output unit 16.

[0017] The acquisition unit 11 acquires various pieces of information used by the information processing device 10 in the calculation process from an external database (DB) or from other information processing devices. The uplift displacement calculation unit 12 calculates the uplift displacement generated in the tank based on the acceleration waveform of the generated seismic motion, using the horizontal vibration value obtained from the model in the seismic response analysis by a single-degree-of-freedom nonlinear horizontal spring model and the uplift displacement calculation formula.

[0018] The corner strain calculation unit 13 inputs the value indicated by the peak of the uplift displacement waveform at the corner of the tank due to vibration and the coefficient corresponding to the tank into the corner strain calculation formula to calculate the corner strain.

[0019] The strain amplitude calculation unit 14 calculates the strain amplitude indicating the difference between the maximum and minimum of the corner strain obtained from the uplift displacement at the corner (near the joint of the bottom plate and the side plate) of the bottom plate and the side plate in response to vibration. The difference between the maximum and minimum of the corner strain is the value of the strain variation from zero to the peak of the uplift displacement.

[0020] The cumulative damage degree calculation unit 15 calculates the cumulative damage degree of the corner of the tank at the number of repetitions of the corner strain amplitude corresponding to the repeated occurrence of the peak of the uplift displacement generated in the tank.

[0021] The output unit 16 performs processing to store information such as the uplift displacement amount, corner strain, strain amplitude, and cumulative damage degree calculated by the information processing device 10 in the storage unit or display the information on the display unit.

[0022] FIG. 4 is a diagram showing an outline of the calculation process of the uplift displacement. FIG. 4(4a) shows the uplift state of the corner of the tank due to seismic motion. The uplift of the corner is mainly caused by the rocking vibration in which the tank and the storage target (such as oil) inside the tank vibrate horizontally due to the inertial force in the horizontal direction by short-period seismic motion (high-frequency vibration). Therefore, in the present disclosure, the information processing device 10 models this rocking vibration by a single-degree-of-freedom nonlinear horizontal spring model and obtains the response displacement Δ of the mass point of the entire tank including the storage target. The response displacement Δ is the lateral movement amount of the mass point of the entire tank including the storage target.

[0023]

Number

[0024] In the single - particle system non - linear horizontal spring model shown by Equation (1), M1 is the effective mass in the entire tank and its stored object (the mass of the mass that affects the response acceleration), C e is the damping corresponding to the response velocity of the particle once (the lateral movement of the particle once), Q R is the restoring force characteristic of the particle corresponding to the force applied in the lateral direction of the tank and the uplifting displacement at the corner, Δ is the response displacement of the particle, u g represents the ground motion displacement (ground motion waveform). Also, in Equation (1), [··] attached above Δ and u represents the second - order time derivative, and [·] attached above Δ represents the first - order time derivative. The effective mass M1 in the entire tank and its stored object, the damping C e corresponding to the response velocity of the particle once, and the restoring force characteristic Q R of the particle corresponding to the force applied in the lateral direction of the tank and the uplifting displacement at the corner are coefficients specific to the tank and may vary for each tank.

[0025] Figure 5 is a graph showing the restoring force characteristic Q R . As shown in Figure 5, the restoring force shown by the restoring force characteristic Q R tends to weaken (the slope decreases) as the response displacement Δ of the particle increases.

[0026] The information processing device 10 calculates the waveform of the response displacement Δ of the particle according to the ground motion acceleration (the ground motion acceleration is the second - order time derivative of the ground motion displacement u g with [··] attached above u of u g ) shown by Equation (1) based on the single - particle system non - linear horizontal spring model. The uplifting displacement δ at the corner of the tank corresponding to the waveform of the response displacement Δ of the particle is calculated using the uplifting displacement calculation formula (2). In the following text, the ground motion acceleration (with [··] attached above u of u g ) in the mathematical formula will be represented by another character "u g ’" for explanation.

[0027]

Number

[0028] In the uplift displacement calculation formula (2), H1 is the height of the mass point of the entire tank, D is the diameter of the cylindrical tank, and K b is the spring constant in the initial uplift stage in the single-mass nonlinear horizontal spring model. The height H1 of the mass point of the entire tank, the diameter D of the tank, and the spring constant K b are coefficients specific to the tank and may vary for each tank. Then, the information processing device 10 inputs the value δ indicated by the peak of the uplift displacement waveform at the corner and the coefficient corresponding to the tank into the corner strain calculation formula (3) to calculate the corner strain ε at the corner of the tank.

[0029]

Number

[0030] In the uplift displacement calculation formula, ε is the corner strain, C is the coefficient corresponding to the type of steel plate constituting the bottom plate (annular plate), p is the liquid pressure at the bottom of the tank (N (Newton) / mm 2 ), δ is the peak value of the uplift displacement (mm (millimeter)), t a is the plate thickness of the bottom plate (annular plate) (mm), and σ y is the yield stress of the bottom plate (annular plate) (N / mm 2 ). These coefficients C corresponding to the type of steel plate constituting the bottom plate, the liquid pressure p at the bottom of the tank, the peak value δ of the uplift displacement, the plate thickness t of the bottom plate (annular plate) a , and the yield stress σ of the bottom plate (annular plate) y are coefficients specific to the tank and may vary for each tank.

[0031] Figure 6 is a diagram showing the processing flow of the information processing device. Figure 7 shows the waveform of the uplift displacement δ at the corner according to the seismic acceleration of the seismic motion. Next, the processing flow of the information processing device will be described step by step. First, the acquisition unit 11 of the information processing apparatus 10 detects the information acquisition timing (step S101). The information acquisition timing may be, for example, when an earthquake occurs. Or the information acquisition timing may be a timing other than when an earthquake occurs. The acquisition unit 11 acquires the identification information of the tanks to be calculated from the storage unit such as the HDD 104. The tanks to be calculated may be, for example, all the tanks in the earthquake occurrence area. The acquisition unit 11 may acquire information such as the location of the earthquake epicenter from an external information providing server in order to determine the calculation target. The method for determining the tanks to be calculated may be any method. The tanks to be calculated may be determined in advance. The acquisition unit 11 acquires the seismic wave form u of each tank recorded in association with the identification information (ID, etc.) of one or more tanks to be calculated, which represents the ground motion acceleration g ’(u g in the formula with [··] on top of u, corresponding to the mathematical formula character) from the per-tank ground motion DB 20 (step S102). The seismic wave form (ground motion acceleration u g ’) acquired by the acquisition unit 11 may be a seismic wave form calculated according to the ground conditions at the location of the tank determined as the calculation target from the ground motion recorded by the seismograph or the simulated ground motion. The acquisition unit 11 acquires the seismic wave form data indicating the relationship between the identification information of the tank and the seismic wave form (ground motion acceleration u g ’) at the location of the tank from the per-tank seismic DB 20.

[0032] Also, the acquisition unit 11 acquires the coefficients used for calculating the uplifting displacement at the corner parts of each tank determined as the calculation target from a predetermined storage unit (step S103). The predetermined storage unit may be an external database or the HDD 104 of the device itself. The coefficients used for calculating the uplifting displacement at the corner parts are, as described above, the effective mass M1 in the tank and its entire storage target, the damping C corresponding to the response velocity of the mass point, the restoring force characteristic Q of the mass point corresponding to the force applied in the lateral direction of the tank and the uplifting displacement at the corner parts e , the height H1 of the mass point of the entire tank, the diameter D of the tank, the spring constant K R , the coefficient C according to the type of steel plate constituting the bottom plate, the liquid pressure p at the bottom of the tank, the plate thickness t of the bottom plate (annular plate) b a, the yield stress σ of the bottom plate (annular plate) y is as follows.

[0033] And the uplift displacement calculation unit 12 inputs, into the single-degree-of-freedom nonlinear horizontal spring model (1), the effective mass M1 in the tank to be calculated and the entire storage target thereof, the damping C corresponding to the response velocity of the mass point, e the restoring force characteristic Q of the mass point corresponding to the force applied in the lateral direction of the tank and the uplift displacement at the corner, R and the seismic acceleration u g ' of the tank obtained in step S102. Thereby, the uplift displacement calculation unit 12 calculates the response displacement Δ of the mass point corresponding to the seismic acceleration u g '. The uplift displacement calculation unit 12 repeats the calculation of the response displacement Δ for each value of the seismic acceleration u g ' at a predetermined interval in the waveform indicated by the seismic acceleration u g '. Thereby, the uplift displacement calculation unit 12 calculates the waveform of the response displacement Δ of the mass point corresponding to the seismic acceleration u g ' (step S104). The waveform of the response displacement Δ of the mass point corresponding to the seismic acceleration u g ' using the single-degree-of-freedom nonlinear horizontal spring model (1) may be calculated by another information processing device, and the information processing device 10 may acquire this.

[0034] Also, the uplift displacement calculation unit 12 inputs the value of the response displacement Δ of the mass point corresponding to the seismic acceleration u g ', the height H1 of the mass point of the entire tank, the diameter D of the tank, and the spring constant K b into the uplift displacement calculation formula (2) to calculate the uplift displacement δ. The uplift displacement calculation unit 12 repeats the calculation of the uplift displacement δ for each value of the response displacement Δ at a predetermined interval in the waveform indicated by the response displacement Δ of the mass point corresponding to the seismic acceleration u g ', and calculates the time history response waveform (FIG. 7) of the uplift displacement δ (step S105).

[0035] The seismic acceleration u g of the seismic motion shown in FIG. 7From the waveform of the uplifting displacement δ of the corner part corresponding to '', it can be seen that the peaks of the uplifting displacement δ occur 10 times as δ1, δ2, ···, δ10. The uplifting displacement calculation unit 12 identifies the peak values from the waveform data of the calculated uplifting displacement δ, and outputs the peak values of these uplifting displacements δ (in the case of FIG. 7, each peak value of the 10 occurrences of δ1, δ2, ···, δ10) to the corner strain calculation unit 13.

[0036] In addition, the calculation of the time history response waveform of the uplifting displacement δ and the identification of the peak value of the uplifting displacement δ may also be calculated by other information processing devices, and the information processing device 10 may acquire these results. That is, in this case, the information processing device 10 may perform the processing from the calculation of the corner strain in the following description.

[0037] The corner strain calculation unit 13 acquires the peak values of the uplifting displacement δ of the corner part during the occurrence of ground motion (in the case of FIG. 7, each peak value of the 10 occurrences of δ1, δ2, ···, δ10). The corner strain calculation unit 13 uses the peak value δ1 of the uplifting displacement of the first occurrence, the coefficient C corresponding to the type of steel plate constituting the bottom plate, which is a coefficient specific to the tank to be calculated, the liquid pressure p at the bottom of the tank, the peak value δ of the uplifting displacement, the plate thickness t of the bottom plate (annular plate) a , and the yield stress σ of the bottom plate (annular plate) y and inputs them into the corner strain calculation formula (3). Thereby, the corner strain calculation unit 13 calculates the corner strain ε1 at the corner of the tank corresponding to the peak value δ1 of the uplifting displacement of the first occurrence.

[0038] Similarly, the corner strain calculation unit 13 uses the peak value δ2 of the uplifting displacement of the second occurrence, the coefficient C corresponding to the type of steel plate constituting the bottom plate, which is a coefficient specific to the tank to be calculated, the liquid pressure p at the bottom of the tank, the peak value δ of the uplifting displacement, the plate thickness t of the bottom plate (annular plate) a , and the yield stress σ of the bottom plate (annular plate) yis input into the corner strain calculation formula (3). As a result, the corner strain calculation unit 13 calculates the corner strain ε2 at the corner of the tank corresponding to the peak value δ2 of the uplifting displacement in the second occurrence. Thus, the corner strain calculation unit 13 calculates the corner strain ε (ε1, ε2, ···, ε 10 ) for each uplifting displacement δ (δ1, δ2, ···, δ10) of the corner where each peak occurs (step S106). The corner strain calculation unit 13 outputs the corner strain ε for each uplifting displacement δ of the corner where each peak occurs to the strain amplitude calculation unit 14.

[0039] Note that the information processing device 10 may at least calculate the corner strain ε. In related technologies, when calculating the corner strain ε, it was necessary to calculate it using the finite element method. When calculating the corner strain ε using the finite element method, a lot of time, cost, and labor were required for preparatory work, and it was not possible to immediately calculate the corner strain ε of each corner of tanks storing different sizes and different objects at a desired timing such as immediately after an earthquake. According to the present disclosure, the corner strain ε of each corner of tanks storing different sizes and different objects can be immediately calculated with a simple formula of the corner strain calculation formula (3) without using the finite element method, without spending a lot of time, cost, and labor for preparatory work. Thereby, based on the corner strain ε caused by vibration generation for each tank storing different sizes and different objects, the degree of damage can be quickly grasped.

[0040] The strain amplitude calculation unit 14 acquires the corner strain ε for each uplifting displacement δ of the corner where each peak occurs. The strain amplitude calculation unit 14 inputs the corner strain ε1 at the corner of the tank corresponding to the peak value δ1 of the uplifting displacement in the first occurrence into the first strain amplitude calculation formula (4) and calculates the strain amplitude Δε corresponding to the peak value δ1 of the uplifting displacement in the first occurrence (step S107).

[0041] [Equation]

[0042] The strain amplitude calculation unit 14 calculates the corner strains ε2 to ε at the corner portions of the tank corresponding to the peak values δ2 to δ10 of the upward displacement generated after the second time. 10 Input them into the second strain amplitude calculation formula (5) to calculate the strain amplitude Δε corresponding to each peak value δ of the upward displacement generated after the second time (step S108).

[0043]

Equation

[0044] Note that the value of the coefficient 0.3 in the second strain amplitude calculation formula (5) may vary depending on the type such as the size of the tank.

[0045] Through the above processing, the corner strain calculation unit 13 calculates the first corner strain corresponding to the peak value of the first upward displacement generated in the tank based on the waveform indicating vibration, and the second corner strain corresponding to each peak value of the upward displacement generated after the second time in the tank based on the waveform. Also, through the above processing, the strain amplitude calculation unit 14 is the strain amplitude indicating the difference between the maximum and minimum of the corner strain obtained from the upward displacement of the corner portion of the bottom plate according to the vibration indicated by the waveform. The strain amplitude when the first corner strain occurs is calculated using the first strain amplitude calculation formula represented by formula (4), and the strain amplitude when the second corner strain occurs is calculated using the second strain amplitude calculation formula represented by formula (5).

[0046] The strain amplitude calculation unit 14 outputs the strain amplitude Δε corresponding to the peak value δ1 of the upward displacement generated for the first time and the strain amplitude Δε corresponding to each peak value δ of the upward displacement generated after the second time to the cumulative damage degree calculation unit 15.

[0047] The cumulative damage degree calculation unit 15 acquires the strain amplitude Δε corresponding to the peak value δ1 of the first occurrence of the uplift displacement, and the strain amplitude Δε corresponding to each peak value δ of the uplift displacement occurring after the second time. Now, the corner strain ε corresponding to the uplift displacement δ is expressed by Equation (6),

[0048]

Equation

[0049] If the coefficient for each number of occurrences (cycles) at which the peak value of the uplift displacement occurs is c, the strain amplitude Δε can be expressed by Equation (7). Note that the strain amplitude is the value of the strain variation from zero to the peak of the uplift displacement.

[0050]

Equation

[0051] Here, it is assumed that the strength evaluation item for the corner with respect to the uplift during an earthquake is low-cycle fatigue. The phenomenon of the corner repeatedly rising is low-cycle fatigue. The damage degree due to low-cycle fatigue can be obtained by fitting it to Iida's optimum fatigue curve. The cumulative damage degree calculation unit 15 obtains the fatigue life Nc by Equation (8) using Iida's optimum fatigue curve as the S-N curve.

[0052]

Equation

[0053] In Equation (8), f ε is the safety factor with respect to the strain amplitude, and its value is set to 1.1. Note that the safety factor is the ratio of the allowable fatigue life to the reference fatigue life, which is reference fatigue life ÷ allowable fatigue life.

[0054] The cumulative damage degree calculation unit 15 applies the Miner's rule and calculates the damage degree D j for the j-th earthquake from the seismic waveform (ground motion acceleration u gLet i be the number of peaks of the uplift displacement occurring in ‘), and calculate it by the following cumulative damage degree calculation formula (9) (step S109).

[0055] [Number]

[0056] Here, Δε i represents the amplitude of the uplift strain corresponding to the number of peaks of the uplift displacement. Also, N c (Δε i ) represents the fatigue life of the uplift strain amplitude Δε i corresponding to the number of peaks of the uplift displacement. f c represents the safety factor with respect to the number of repetitions.

[0057] Here, when the cumulative damage degree D, which is the sum of the damage degrees D j for a plurality of earthquakes for the j-th earthquake, exceeds 1, it is the end of the life. Therefore, the cumulative damage degree calculation unit 15 calculates the cumulative damage degree for the j earthquakes by summing the damage degrees D j for each earthquake (step S110). Also, when the cumulative damage degree calculation unit 15 does not satisfy the determination formula shown in formula (10), that is, when the cumulative damage degree D exceeds 1, it may be determined that it is the life of the tank, and warning information or the like may be output to a predetermined output destination.

[0058] [Number]

[0059] The information processing device 1 determines whether the processing has been completed for all the tanks to be calculated (step S111). If the information processing device 1 has not completed the processing for all the tanks to be calculated, the processing from step S103 is repeated.

[0060] According to the above processing, the information processing apparatus 10 calculates the damage degree D of the tank in one earthquake using the corner strain ε for each peak of the uplifting displacement δ at the corner in one or a plurality of predetermined tanks calculated without spending much time, cost, and labor for prior preparation. j Moreover, the cumulative damage degree due to multiple earthquakes can be calculated. As a result, the damage degree D of the tank in one earthquake for each tank storing different sizes and different objects j and the cumulative damage degree due to multiple earthquakes can be calculated without spending much time, cost, and labor.

[0061] The output unit 16 of the information processing apparatus 10 acquires the above-mentioned corner strain, damage degree D j and the numerical value of the cumulative damage degree D. Then, the output unit 16 generates display information indicating, for each tank, the corner strain, damage degree D j and the numerical value of the cumulative damage degree D, and warning information with a display mode corresponding to the numerical value, and outputs it to a predetermined output device. As a result, among the tanks storing different sizes and different objects, it is possible to confirm which tank has what degree of corner strain, what degree of damage degree D j has occurred in one earthquake, and what degree of cumulative damage degree D has occurred in multiple past earthquakes. By checking such display information a few minutes after the earthquake has ended, it is possible to quickly take measures such as restoration work against the damage suffered by the tank.

[0062] FIG. 8 is a first diagram showing a comparative example of the relationship between corner strain and uplifting displacement. FIG. 9 is a second diagram showing a comparative example of the relationship between corner strain and uplifting displacement. Using FIGS. 8 and 9, for different tanks, the relationship between the corner strain calculated by the method according to the present disclosure (corner strain calculation formula (3): simplified formula) and the corner strain and the corner uplift displacement calculated by the finite element method (FEM: Finite Element Method) is compared. The example shown in FIG. 8 shows the relationship between the corner strain and the corner uplift displacement calculated by the method according to the present disclosure and the finite element method for Tank A. As shown in FIG. 8, the relationships between the corner strain and the corner uplift displacement calculated by the method according to the present disclosure and the finite element method both result in substantially the same results.

[0063] The example shown in FIG. 9 shows the relationship between the corner strain and the corner uplift displacement calculated by the method according to the present disclosure and the finite element method for Tank B. As shown in FIG. 9, the relationships between the corner strain and the corner uplift displacement calculated by the method according to the present disclosure and the finite element method both result in substantially the same results. That is, when calculating the corner strain of the present disclosure, it is possible to calculate the corner strain with high accuracy similar to the finite element method using the simple formula of the corner strain calculation formula (3).

[0064] FIG. 10 is a diagram showing another configuration of the information processing apparatus. FIG. 11 is a diagram showing the processing flow of the information processing apparatus with another configuration. The information processing apparatus 10 of the present disclosure only needs to include at least a corner strain calculation unit 13. The corner strain calculation unit 13 inputs the value indicated by the peak of the corner uplift displacement waveform indicating the vicinity of the joint between the side plate and the bottom plate constituting the tank due to vibration and the coefficient corresponding to the tank into the corner strain calculation formula, and calculates the corner strain at the corner (step S111).

[0065] In the example of the information processing apparatus 10 described above, the case where the example of the vibration applied to the tank is seismic motion is described as an example. However, in other examples, the example of the vibration applied to the tank may be other than seismic motion. For example, the corner strain of a tank vibrating due to wind, the strain amplitude, the damage degree, and the cumulative damage degree may be calculated.

[0066] Incidentally, the above information processing apparatus records a program for executing all or part of the processes to be performed on a computer-readable recording medium, causes the computer system to read the program recorded on this recording medium, and performs the processes of each part by executing it. Here, the "computer system" is assumed to include hardware such as an OS and peripheral devices. Further, the "computer-readable recording medium" refers to a portable medium such as a flexible disk, a magneto-optical disk, a ROM (Read Only Memory), a CD-ROM (Compact Disc Read Only Memory), or a storage device such as a hard disk built into the computer system. Further, the above program may be for realizing a part of the functions described above, or may be a combination of the functions described above and a program already recorded in the computer system to realize the functions.

[0067] Incidentally, the above embodiment may be defined as follows.

[0068] (Appendix 1) An information processing system including a corner strain calculation unit that inputs a value indicated by a peak of a lifting displacement waveform of a corner portion showing the vicinity of a joint portion between a side plate and a bottom plate constituting a tank due to vibration and a coefficient corresponding to the tank into a corner strain calculation formula, and calculates the corner strain at the corner portion.

[0069] (Appendix 2) The corner strain calculation unit calculates the corner strain as ε, a coefficient corresponding to the type of steel plate constituting the bottom plate as C, the liquid pressure at the bottom of the tank as p, the peak value of the lifting displacement as δ, the plate thickness of the bottom plate as t a , the yield stress of the bottom plate as σ y and calculates the corner strain using the corner strain calculation formula represented by Equation (1). [Number] The information processing system according to Appendix 1.

[0070] (Appendix 3) The corner strain calculation unit calculates a first corner strain corresponding to a peak value of the first upward displacement generated in the tank based on the waveform indicating the vibration, and a second corner strain corresponding to each peak value of the upward displacements generated in the tank after the second time based on the waveform, calculates a strain amplitude indicating the difference between the maximum and minimum of the first corner strain using a first strain amplitude calculation formula represented by Formula (2), [Number] calculates a strain amplitude indicating the difference between the maximum and minimum of the second corner strain using a second strain amplitude calculation formula represented by Formula (3). [Number] The information processing system according to Appendix 2, comprising a strain amplitude calculation unit.

[0071] (Appendix 4) a cumulative damage degree calculation unit that calculates the cumulative damage degree of the corner portion at the number of repetitions corresponding to the repeated occurrence of the peak of the upward displacement generated in the tank based on the waveform using a cumulative damage degree calculation formula; The information processing system according to Appendix 3, comprising the same.

[0072] (Appendix 5) The corner strain calculation unit is a coefficient corresponding to the target tank, where a coefficient corresponding to the type of steel plate constituting the bottom plate is C, the liquid pressure at the bottom of the tank is p, the peak value of the upward displacement is δ, the plate thickness of the bottom plate is t a , the yield stress of the bottom plate is σ y and calculates the corner strain using the corner strain calculation formula. The information processing system according to Appendix 2.

[0073] (Appendix 6) Using the waveform of the generated vibration, the upward displacement that occurred in the tank, a single-degree-of-freedom non-linear horizontal spring model, the horizontal vibration peak value obtained from the model, and the upward displacement calculation formula, an upward displacement calculation unit that calculates the peak value of the upward displacement The information processing system according to any one of Appendices 1 to 5, comprising

[0074] (Appendix 7) An acquisition unit that acquires the acceleration waveform of the seismic motion as the waveform of the vibration when the seismic motion occurs The information processing system according to Appendix 6, comprising

[0075] (Appendix 8) Input the value indicated by the peak of the upward displacement waveform of the corner portion showing the vicinity of the joint between the side plate and the bottom plate constituting the tank due to vibration, and the coefficient corresponding to the tank into the corner strain calculation formula, and calculate the corner strain at the corner portion Information processing method

[0076] (Appendix 9) Let the corner strain be ε, the coefficient corresponding to the type of steel plate constituting the bottom plate be C, the liquid pressure at the bottom of the tank be p, the peak value of the upward displacement be δ, the plate thickness of the bottom plate be t a , and the yield stress of the bottom plate be σ y As, use the corner strain calculation formula represented by Equation (1) to calculate the corner strain

Equation

[0077] (Appendix 10) The corner strain calculation unit calculates a first corner strain corresponding to the peak value of the first upward displacement generated in the tank based on the waveform indicating the vibration, and a second corner strain corresponding to each of the peak values of the upward displacements generated in the tank after the second time based on the waveform Calculate the strain amplitude indicating the difference between the maximum and minimum of the first corner strain using the first strain amplitude calculation formula represented by Equation (2).

Number

Number

[0078] (Supplementary Note 11) Based on the waveform, calculate the cumulative damage degree of the corner part at the number of repetitions corresponding to the repeated occurrence of the peak of the uplifting displacement generated in the tank using the cumulative damage degree calculation formula. The information processing method described in Supplementary Note 10 comprising the above.

[0079] (Supplementary Note 12) The coefficient corresponding to the target tank, where the coefficient corresponding to the type of steel plate constituting the bottom plate is C, the liquid pressure at the bottom of the tank is p, the peak value of the uplifting displacement is δ, the plate thickness of the bottom plate is t a , the yield stress of the bottom plate is σ y And calculate the corner strain using the corner strain calculation formula. The information processing method described in Supplementary Note 9.

[0080] (Supplementary Note 13) Using the generated vibration waveform, the uplifting displacement generated in the tank as a single - mass - point non - linear horizontal spring model, the horizontal vibration peak value obtained from the model, and the uplifting displacement calculation formula, calculate the peak value of the uplifting displacement. The information processing method described in any one of Supplementary Notes 8 to 12.

[0081] (Supplementary Note 14) Acquire the acceleration waveform of the ground motion as the vibration waveform when the ground motion is occurring. The information processing method described in Supplementary Note 13.

[0082] (Supplementary Note 15) Cause the computer of the information processing system to Input the value indicated by the peak of the uplift displacement waveform of the corner portion showing the vicinity of the joint between the side plate and the bottom plate constituting the tank due to vibration and the coefficient corresponding to the tank into the corner strain calculation formula, and calculate the corner strain at the corner portion, a corner strain calculation means A program that functions as

[0083] (Supplementary Note 16) The corner strain calculation means calculates the corner strain using the corner strain calculation formula represented by Equation (1), where the corner strain is ε, the coefficient corresponding to the type of steel plate constituting the bottom plate is C, the liquid pressure at the bottom of the tank is p, the peak value of the uplift displacement is δ, the plate thickness of the bottom plate is ta, and the yield stress of the bottom plate is σy. [Number] The program described in Supplementary Note 15.

[0084] (Supplementary Note 17) The corner strain calculation means calculates a first corner strain corresponding to the peak value of the first uplift displacement generated in the tank based on the waveform indicating the vibration, and a second corner strain corresponding to each peak value of the uplift displacements generated in the tank after the second time based on the waveform. Calculate the strain amplitude indicating the difference between the maximum and minimum of the first corner strain using the first strain amplitude calculation formula represented by Equation (2). [Number] Calculate the strain amplitude indicating the difference between the maximum and minimum of the second corner strain using the second strain amplitude calculation formula represented by Equation (3). [Number] Strain amplitude calculation means The program described in Supplementary Note 16 that functions as

[0085] (Supplementary Note 18) Cumulative damage degree calculation means for calculating the cumulative damage degree of the corner part at the number of repetitions corresponding to the repeated occurrence of the peak of the upward displacement generated in the tank based on the waveform using a cumulative damage degree calculation formula, The program described in Supplementary Note 17 that functions as

[0086] (Supplementary Note 19) The corner strain calculation means is the coefficient corresponding to the target tank, where C is the coefficient corresponding to the type of steel plate constituting the bottom plate, p is the liquid pressure at the bottom of the tank, δ is the peak value of the upward displacement, t is the plate thickness of the bottom plate a , and σ is the yield stress of the bottom plate y and calculates the corner strain using the corner strain calculation formula The program described in Supplementary Note 16

[0087] (Supplementary Note 20) Upward displacement calculation means for calculating the peak value of the upward displacement using the waveform of the generated vibration, the upward displacement generated in the tank, a one-degree-of-freedom non-linear horizontal spring model, and a horizontal vibration peak value and upward displacement calculation formula obtained from the model, The program described in any one of Supplementary Notes 15 to 19 that functions as

[0088] (Supplementary Note 21) Acquisition means for acquiring the acceleration waveform of the seismic motion as the waveform of the vibration when the seismic motion occurs, The program described in Supplementary Note 20 that functions as

Explanation of Reference Signs

[0089] 10 ··· Information processing device 20 ··· Seismic motion DB for each tank 30 ··· Tank calculation result DB 11 ··· Acquisition unit 12 ··· Buoyancy displacement calculation unit 13 ··· Corner strain calculation unit 14 ··· Strain amplitude calculation unit 15 ··· Cumulative damage degree calculation unit 16 ··· Output unit

Claims

1. An information processing system comprising a corner strain calculation unit that inputs a value indicated by a peak of a lifting displacement waveform of a corner portion indicating the vicinity of a joint portion between a side plate and a bottom plate constituting a tank due to vibration and a coefficient corresponding to the tank into a corner strain calculation formula, and calculates the corner strain at the corner portion.

2. The corner strain calculation unit calculates the corner strain as ε, the coefficient corresponding to the type of steel plate constituting the bottom plate as C, the liquid pressure at the bottom of the tank as p, the peak value of the uplifting displacement as δ, the plate thickness of the bottom plate as t ａ , the yield stress of the bottom plate as σ ｙ and calculates the corner strain using the corner strain calculation formula represented by Equation (1). 【Number 1】 The information processing system according to claim 1.

3. The corner strain calculation unit calculates a first corner strain corresponding to a peak value of the first lifting displacement generated in the tank based on the waveform indicating the vibration, and a second corner strain corresponding to each peak value of the lifting displacements after the second time generated in the tank based on the waveform, calculates a strain amplitude indicating a difference between the maximum and minimum of the first corner strain using a first strain amplitude calculation formula represented by formula (2), 【Number 2】 and calculates a strain amplitude indicating a difference between the maximum and minimum of the second corner strain using a second strain amplitude calculation formula represented by formula (3). 【Number 3】 The information processing system according to claim 2, further comprising a strain amplitude calculation unit.

4. A cumulative damage degree calculation unit that calculates the cumulative damage degree of the corner portion at the number of repetitions corresponding to the repeated occurrence of the peak of the lifting displacement generated in the tank based on the waveform using a cumulative damage degree calculation formula, The information processing system according to claim 3, further comprising:

5. The corner strain calculation unit uses the coefficient corresponding to the target tank, where C is the coefficient corresponding to the type of steel plate constituting the bottom plate, p is the liquid pressure at the bottom of the tank, δ is the peak value of the uplifting displacement, t is the plate thickness of the bottom plate ａ , σ is the yield stress of the bottom plate ｙ , and calculates the corner strain using the corner strain calculation formula The information processing system according to claim 2.

6. A lifting displacement calculation unit that calculates a peak value of the lifting displacement using a waveform of the generated vibration, a single-degree-of-freedom non-linear horizontal spring model of the lifting displacement generated in the tank, a horizontal vibration peak value obtained from the model, and a lifting displacement calculation formula, The information processing system according to any one of claims 1 to 5, further comprising:

7. An acquisition unit that acquires an acceleration waveform of seismic motion as the waveform of the vibration when the seismic motion occurs, The information processing system according to claim 6, further comprising:

8. An information processing method in which a value indicated by a peak of a lifting displacement waveform of a corner portion indicating the vicinity of a joint portion between a side plate and a bottom plate constituting a tank due to vibration and a coefficient corresponding to the tank are input into a corner strain calculation formula, and the corner strain at the corner portion is calculated. Information processing method.

9. The computer of the information processing system Input the value indicated by the peak of the uplifting displacement waveform of the corner part showing the vicinity of the joint between the side plate and the bottom plate constituting the tank due to vibration and the coefficient corresponding to the tank into the corner part strain calculation formula, and calculate the corner part strain at the corner part by means of corner part strain calculation means. A program that functions as.

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