KR20220057067A - Structure Maintenance Index Calculation System and Method Considering Long-Term Behavior due to Relaxation - Google Patents

Abstract

The present invention relates to a structure maintenance index calculation system and method for considering long-term behavior due to relaxation. According to the present invention, the structure maintenance index calculation system comprises: a relaxation function calculation unit calculating a relaxation function on the basis of the properties of a nano-indentation test on a the structure; a management target amount calculation unit calculating a management target amount (δ_n+m) at the time of long-term behavior on the basis of the relaxation function calculated by the relaxation function calculation unit and a finite element analysis of the structure; and a maintenance index calculation unit using an actual management target amount (δ_n) at the present time, a design management target amount (δ_d,n), a design management target amount (δ_d,n+m) at the time of long-term behavior, and the calculated management target amount (δ_n+m) to calculate a maintenance index. Accordingly, the maintenance index is calculated by comparing the present time and the time of long-term behavior, thereby reviewing structural safety according to the long-term behavior as well as the current time of the structure.

Description

Structure Maintenance Index Calculation System and Method Considering Long-Term Behavior due to Relaxation

The present invention relates to a system and method for calculating a structure maintenance index in consideration of long-term behavior by relaxation, and more particularly, calculating a relaxation function from the result of nano-indentation of a structure, and considering the calculated relaxation function Predicting long-term behavior of structures based on finite element analysis of structures and calculating maintenance indexes based on them will be.

Steel structures applied to buildings and civil engineering structures have high specific strength compared to their unit weight and relatively small amount of volume to enter the structure, making them economical and highly useful. In particular, steel has high strength, excellent ductility, and predictable behavior, so it is easy to design. Due to these advantages, steel is widely used in construction and civil engineering fields, such as being used as a tension member not only for a single steel structure but also for a member made of concrete.

On the other hand, since steel functions as a tensile member, despite the initially secured tensile stress, as time elapses, the stress decreases to a certain extent. This reduction in stress in steel is called relaxation, and a phenomenon in which deformation gradually increases in terms of shape is called creep. That is, as the steel material gradually deteriorates as a structural material over time, it is essential to maintain the structure according to its long-term behavior.

For this reason, when the first structure using steel is completed, the strain rate due to long-term behavior is calculated in advance based on the initial design value. It will be used as an index for the maintenance of the structure.

However, such a conventional maintenance index calculation method was limited to reviewing only the structural safety at the present time by only making a one-to-one comparison with the reference strain calculated in advance based on periodic and repeated inspections. That is, there was a limit in that it was not possible to secure a long-term maintenance plan for the structure or to secure the usage guidelines for the structure.

Furthermore, the durability and safety of the structure could not be guaranteed if inaccurate data were measured as it completely relied on the inspector's on-site inspection results without objective indicators. There was an unavoidable limitation of damage, and there was a problem that the accuracy was still not guaranteed even by the non-destructive testing method.

KR 101677840 B1 KR 101706819 B1

The present invention has been devised to solve the above problems, and it is possible to review the structural safety according to the long-term behavior as well as the current time of the structure, and based on this, it is possible to secure a long-term maintenance plan for the structure, The purpose of this is to provide a system and method for calculating the structure maintenance index in consideration of long-term behavior by relaxation that can establish guidelines for use and can provide accurate diagnosis while minimizing damage to the structure.

In order to solve the above technical problem, the structure maintenance index calculation system (S) in consideration of the long-term behavior by relaxation of the present invention is a reel that calculates a relaxation function based on the physical properties of the nano indentation test for the structure racation function calculation unit 20; Based on the relaxation function calculated by the relaxation function calculation unit 20 and the finite element analysis of the structure, the management target amount calculation unit 30 for calculating the management target amount ( Δ _n+m ) at the time of long-term behavior ); and the actual management target amount at the present time ( Δ _n ), the design management target amount ( Δ _d,n ), the design management target amount at the time of long-term behavior ( Δ _d,n+m ), and the estimated management target amount ( Δ _{n + m} ) by using the maintenance index calculation unit 40 for calculating the maintenance index; characterized in that it comprises a.

In addition, the maintenance index calculation unit 40, the ratio ( R _n ) of the actual management target amount ( Δn ) to the design management target amount ( Δd _{,n )} at the present time, and the design of the long-term behavior A maintenance index may be calculated based on the ratio ( R _n+m ) of the calculated management target amount ( Δ _n+m ) to the phase management target amount ( Δ _d,n+m ).

In addition, the maintenance index calculation unit 40, when R _n < 1.0, if R _n+m < 1.0, calculates as 'good', if R _n+m > 1.0, calculates as 'caution', and the R _n In the case of > 1.0, if R _n+m < 1.0, it can be calculated as 'border', and if R _n+m > 1.0, it can be calculated as 'severe'.

In addition, the subdivision index calculator 50 for calculating a subdivided maintenance index by using the R _n and R _n+m ; may further include.

In addition, the subdivision index calculation unit 50 is a maintenance index subdivided based on the value of C _n = ( R _n + R _n+m )/2 , which is 'very', 'moderate' or 'slightly'. can yield one.

And it may further include a; physical property measurement unit 10 for measuring the properties required to calculate the relaxation function by performing a nano-indentation test based on the sample for the structure.

On the other hand, in the structure maintenance index calculation method (M) in consideration of the long-term behavior by relaxation of the present invention, the relaxation function calculation unit 20 is a relaxation function based on the physical properties of the nano-indentation test for the structure. A relaxation function calculation step of calculating (S20); A management object amount calculation step (S30) in which the management object amount calculation unit 30 calculates the management object amount ( Δ _n+m ) at the time of long-term behavior based on the calculated relaxation function and the finite element analysis for the structure; and the maintenance index calculating unit 40 calculates the actual management target amount ( Δn) at the present time, the design management target amount (Δd,n), and the design management target amount (Δd , _{n +} at _the time of long-term operation) _m ) and a maintenance index calculation step (S40) of calculating a maintenance index by using the calculated management target amount ( Δn _+m ).

In addition, in the maintenance index calculation step (S40), the maintenance index calculation unit 40 calculates the ratio of the actual management target amount ( Δn ₎ to the design management target amount ( Δd _,n ) at the present time ( Based on the ratio ( R _n+m ) of R _n ) and the estimated management target amount ( Δ _n+m ) to the design management target amount ( Δ _d,n+m ) at the time of long-term behavior, the maintenance index is calculated. can be calculated.

The method may further include a subdivision index calculation step (S50) in which the subdivision indicator calculation unit 50 calculates a subdivided maintenance indicator using R _n and R _n+m .

And the physical property measurement unit 10 performs a nano-indentation test based on the sample for the structure to measure the physical property required to calculate the relaxation function (S10); may further include a.

According to the structure maintenance index calculation system and method in consideration of the long-term behavior by relaxation of the present invention, the relaxation function is calculated using the physical properties of the nano indentation test for the structure, and the finite element analysis of the structure is used. By calculating the amount to be managed at the time of long-term behavior with the calculation of the maintenance index in preparation for the current time and the time of long-term behavior, it is possible to review the structural safety according to the long-term behavior as well as the current time of the structure.

In addition, it is possible to secure a long-term maintenance plan for a structure by calculating a maintenance index based on the time of long-term behavior, and to establish guidelines for use corresponding thereto.

Furthermore, in the field, it is sufficient to measure the amount to be managed at the present time and measure only the physical properties required to calculate the relaxation function based on the nano indentation test, so that damage to the structure can be minimized.

In addition, it is possible to provide an accurate and objective diagnosis according to long-term behavior based on the quantified maintenance index.

1 is a block diagram schematically showing the configuration of a structure maintenance index calculation system in consideration of the long-term behavior by relaxation of the present invention.
2 is a block diagram illustrating a hardware configuration diagram of a management device according to an embodiment of the present invention.
3 is a flowchart schematically illustrating a method of calculating a structure maintenance index in consideration of long-term behavior by relaxation of the present invention.
4 to 7 are graphs showing the initial design value (blue) and the updated value (red) for the amount of deflection in Examples 1 to 4;
8 is a conceptual diagram of a Maxwell model for explaining the conceptual principle for relaxation of steel.

Hereinafter, the structure maintenance index calculation system (S) and method (M) in consideration of the long-term behavior by relaxation of the present invention will be described in detail based on the accompanying drawings.

1 is a block diagram schematically illustrating the configuration of a structure maintenance index calculation system (S) in consideration of long-term behavior by relaxation of the present invention. A relaxation function calculated based on physical properties of a nano indentation test for a structure. B, the database (D) in which the management target information input by the manager is stored, the relaxation function calculation unit 20 that calculates a relaxation function based on physical properties, and management that calculates the management target amount at the time of long-term behavior A processing device (P) including a target amount calculation unit (30) and a maintenance index calculation unit (40) for calculating a maintenance index, and if necessary, input various information into the processing device (P) or the processing device (P) ) includes a terminal (T) receiving the calculated information.

In addition, the database (D), the processing device (P), and the terminal (T) can transmit and receive information through a mutual communication network. In this case, the communication network may be provided in various ways such as wired/wireless Internet, intranet, and LAN to communicate with each other, and various devices such as a tablet PC, a notebook computer, or a desktop may be used as the terminal T.

On the other hand, "management device (P)" as defined in the present invention means a central processing unit implemented on a terminal such as a notebook, computer, smart phone or smart pad (E-PAD), etc., in the form of a server, may be in a form that can provide a service of It may be implemented to include the above processor, a network interface, a memory for loading a computer program executed by the processor, a storage for storing large-capacity network data and a computer program, and a system bus.

In addition, as used in the specification of the present invention, '~ unit' means 'a block configured to change or plug-in a system of hardware or software', that is, a unit that performs a specific function in hardware or software, or means block.

The structure maintenance index calculation system (S) in consideration of the long-term behavior by relaxation of the present invention is a relaxation function calculated based on the physical properties of the nano-indentation test for a structure, or a safety review item input by an administrator The maintenance index for the structure is calculated by using the database (D) including management target information such as deflection amount and tension.

) 등은 후술할 물성치 측정부(10)에 의하여 측정되어 자동으로 데이터베이스(D)에 전송되거나, 관리자가 단말기(T)로 직접 측정된 값을 입력할 수 있다. On the other hand, the relaxation function calculation unit 20 of the processing device (P) calculates a relaxation function based on the physical properties of the nano-indentation test for the structure. At this time, the physical properties of the structure for calculating the relaxation function, for example, elastic modulus ( E ), viscosity (

) and the like are measured by the physical property measurement unit 10 to be described later and automatically transmitted to the database D, or an administrator may directly input the measured values to the terminal T.

The relaxation function may be expressed in the form of Equation 1 below.

와

(E ₁ , E ₂ 는 탄성계수,

는 점도)은 매개변수이다. As shown in FIG. 8, the relaxation function is based on a Generalized Maxwell model with three elements (two springs and one damping), the relaxation loss ( r(%) ) is calculated can be, which is the value obtained by dividing the amount of stress reduction by the initial loading stress,

Wow

( E ₁ , E ₂ are the modulus of elasticity,

is the viscosity) is a parameter.

When the relaxation function is calculated by the relaxation function calculation unit 20, management of the long-term behavior point based on the relaxation function calculated by the management target amount calculation unit 30 and the finite element analysis of the structure Calculate the target amount ( Δ _n+m ). A general-purpose simulation program can be used for finite element analysis. In this case, the long-term behavior time point ( n + m ) may be defined as a time point when m years have elapsed from the current time point ( n ).

Specifically, the management target amount estimator 30 calculates the management target amount ( Δn _+m ) based on a specific long-term behavior time point ( n+m ) within the durability life of the structure and the relaxation function and finite element It is calculated based on the analysis, and when the information to be managed is deflection, the amount to be managed becomes the amount of deflection, and when the information to be managed is tension, the amount to be managed becomes the tension value.

When the management target amount calculating unit 30 calculates the management target amount ( Δ _{n +m} ) at the time of long-term operation, the maintenance index calculation unit 40 calculates the actual management target amount ( Δn ) at the current time point ( n ) ), the amount to be managed by design ( Δ _d,n ), and the amount to be managed by design ( Δ _d,n+m ) at the time of long-term behavior, and the long-term behavior time calculated by the management amount calculating unit 30 The maintenance index is calculated using the management target amount ( Δ _n+m ).

At this time, the actual management target amount ( Δ _n ) at the current time point ( n ) can be input to the database (D) using the terminal (T) based on the actual measurement of the structure, and when the structure using the first steel material is completed, the initial design Since the strain rate due to long-term behavior is calculated in advance based on the value, the design management target quantity ( Δ _d,n ) at the current time point ( n ) is specified based on the progress of the current time point ( n ) with respect to the initial design value. can do. In addition, the amount to be managed ( Δ _d,n+m ) at the time of long-term behavior can be specified based on the elapse of the time of long-term behavior ( n+m ) with respect to the initial design value in the same way.

Therefore, the maintenance index calculation unit 40 calculates the actual management target amount ( Δn ) at the measured current time point ( n ), the current time point ( _n ) already designed as the initial design value, and the long-term behavior time point ( n +m ) Based on the design management target amount ( Δ _d,n ) ( Δ _d,n+m ), the maintenance index is calculated using the calculated long-term behavior point management target amount ( Δ _n+m ).

Accordingly, according to the structure maintenance index calculation system (S) in consideration of the long-term behavior by relaxation of the present invention, it is possible to review the structural safety according to the long-term behavior as well as the safety review for the current time of the structure. By calculating the maintenance index based on the time of movement, it is possible to secure a long-term maintenance plan for the structure and to establish guidelines for its use.

In one embodiment, the maintenance index calculator 40 calculates the ratio ( R _n ) of the actual management target amount ( Δn ) to the design management target amount ( Δd _{,n )} at the present time, and the long-term behavior time The maintenance index can be calculated based on the ratio ( R _n+m ) of the calculated management target amount ( Δ _n+m ) to the management target amount ( Δ _d,n+m ) in the design of .

That is, the R _n and R _n+m can be expressed by the following Equation (2).

As shown in Table 1, the maintenance index calculation unit 40 is 'good' if R _{n + m} < 1.0 when R _n < 1.0 based on Equation 2 as shown in Table 1, and R _{n + m} > 1.0 It is calculated as 'Caution', and when R _n > 1.0, R _n+m < 1.0 is calculated as 'Border', and if R _n+m > 1.0, it is calculated as 'Severe', thereby calculating the structure maintenance index considering long-term behavior. can do.

Evaluation of the condition of structures according to indicators state R _n R _n+m Good < 1.0 < 1.0 caution < 1.0 > 1.0 boundary > 1.0 < 1.0 serious > 1.0 > 1.0

Meanwhile, the processing device P may further include a subdivision indicator calculating unit 50 for calculating a subdivided maintenance indicator using the R _n and R _n+m . The subdivision indicator calculation unit 50 includes four status indicator items calculated by the maintenance indicator calculation unit 40, 'very', 'caution', 'vigilance' and 'severe', respectively It can be subdivided into 'moderate' and 'slight' levels.

In one embodiment, the subdivision indicator calculating unit 50 may calculate any one of 'very', 'moderate', or 'slightly' as a subdivided maintenance indicator based on Equation 3 below. .

As shown in Table 2, the subdivision index calculation unit 50 determines that the index item of the maintenance index calculation unit 40 is 'good' and 'very' if C _n < 0.8, based on Equation 3, as shown in Table 2. , if C _n is 0.8 ~ 0.9, it is calculated as 'moderate', _if C _n is 0.9 ~ 1.0, it _is calculated as ' somewhat ' . If it is 1.0 ~ 1.1, it is calculated as ' moderate ', _if C _n < 1.0, it _is calculated as ' slightly ' . _{If n} is 1.0 to 1.1, it is calculated as 'slightly'.

Segmentation of evaluation of the condition of structures according to the size of the surface state robbery C _n
Good So < 0.8 usually 0.8 to 0.9 slightly 0.9 to 1.0
caution So > 1.1 usually 1.0 to 1.1 slightly < 1.0
boundary So > 1.1 usually 1.0 to 1.1 slightly < 1.0
serious So > 1.2 usually 1.1 to 1.2 slightly 1.0 to 1.1

In addition, the structure maintenance index calculation system (S) in consideration of the long-term behavior by relaxation of the present invention performs a nano-indentation test based on a sample for a structure using the physical property measurement unit 10 to perform a relaxation function It is possible to measure the physical properties required to calculate .

The physical property measurement unit 10 measures a physical property value based on the nano-indentation test for the structure, and calculates a relaxation function based on the measured physical property value. In this case, the physical property value of the structure measured by the physical property measurement unit 10 may be automatically transmitted to the database D, or an administrator may directly input the measured value into the terminal T. Accordingly, it is possible to minimize damage to the structure unnecessarily during the inspection process.

On the other hand, the structure maintenance index calculation method (M) in consideration of the long-term behavior by relaxation of the present invention is performed by the management device (P) of the above-described structure maintenance index calculation system (S), Figure 3 As shown in Fig. , it may include a physical property measurement step (S10), a relaxation function calculation step (S20), a management target amount calculation step (S30), and a maintenance index calculation step (S40).

) 등은 물성치 측정부(10)에 의하여 측정되어 자동으로 데이터베이스(D)에 전송되거나, 관리자가 단말기(T)로 직접 측정된 값을 입력할 수 있다. The relaxation function calculation step (S20) is a step in which the relaxation function calculation unit 20 calculates a relaxation function expressed by Equation 1 based on the physical properties of the nano-indentation test for the structure. At this time, the physical properties of the structure for calculating the relaxation function, for example, elastic modulus ( E ), viscosity (

), etc. are measured by the physical property measurement unit 10 and automatically transmitted to the database D, or an administrator can directly input the measured values to the terminal T.

The management target amount calculation step (S30) that proceeds after the relaxation function calculation step (S20) is a long-term based on the relaxation function calculated by the management target amount calculation unit 30 and the finite element analysis for the structure This is the step of calculating the amount to be managed ( Δ _n+m ) at the time of movement. In the management target amount calculation step (S30), the management target amount ( Δ _n+m ) based on a specific long-term behavior point ( n+m ) within the durability life of the structure is based on the above-described relaxation function and finite element analysis , and when the information to be managed is sag, the amount to be managed becomes the amount of deflection, and when the information to be managed is tension, the amount to be managed may be a tension value.

In the maintenance index calculation step (S40), which is performed after the management target amount calculation step (S30), the maintenance index calculation unit 40 calculates the actual management target amount ( Δn ₎ at the present time, and the design management target amount ( Δ _d,n ) and the design management target amount ( Δ _d,n+m ) at the time of long-term behavior, and the calculated management target amount ( Δ _n+m ) are used to calculate the maintenance index. In the maintenance index calculation step (S40), the actual management target amount ( Δ _n ) at the measured current time ( n ), the current time ( n ) already designed as an initial design value, and the long-term behavior time ( n+m ) Based on the amount to be managed ( Δ _d,n ) ( Δ _d,n+m ), the maintenance index is calculated using the amount to be managed ( Δ _n+m ) at the time of the calculated long-term behavior.

In one embodiment, the step of calculating the maintenance index ( S40 ) includes the ratio ( R _n ) of the actual management target amount ( Δn ) to the design management target amount ( Δd _,n ) at the present time ( _Rn ), and the long-term behavior time The maintenance index can be calculated based on the ratio ( R _n+m ) of the calculated management target amount ( Δ _n+m ) to the management target amount ( Δ _d,n+m ) by design of R _n and R _n+m may be expressed by Equation 2 described above. In the maintenance index calculation step (S40), based on the result value of Equation 2 and Table 1, the maintenance index items are classified into four categories: 'Good', 'Caution', 'Caution' and 'Severe'. can

On the other hand, after the maintenance indicator calculation step (S40), the subdivision indicator calculation step (S50) in which the subdivision indicator calculation unit 50 calculates a subdivided maintenance indicator using R _n and R _n+m may be additionally performed. there is. In one embodiment, the subdivision index calculation step (S50) is a subdivision item based on the result value of Equation 3 and Table 2, and is classified into three categories of 'very', 'moderate' and 'slight' for each index item. can be calculated by

In addition, in the structure maintenance index calculation method (M) in consideration of the long-term behavior by relaxation of the present invention, the physical property measurement unit 10 collects a sample for the structure before the relaxation function calculation step (S20) Based on the nano-indentation test, the method may further include a physical property measurement step (S10) of measuring a physical property required to calculate a relaxation function. In this case, the physical property value of the structure measured in the physical property measurement step S10 may be automatically transmitted to the database D, or an administrator may directly input the measured value into the terminal T. Accordingly, it is possible to minimize damage to the structure unnecessarily during the inspection process.

On the other hand, in the following, the structure maintenance index calculation system (S) and method (M) in consideration of the long-term behavior by relaxation of the present invention will be described in detail based on an embodiment in which the management target information is set to sag.

Measurement time n: 5 years, current ( n ) deflection ( Δ _n ): 171 mm, current ( n ) design deflection ( Δ _d,n ): 218 mm, long-term behavior n+m: 35 years, above The amount of deflection ( Δ _{n+m ) at the time of long-term behavior ( n+m} ) : 326mm, the amount of deflection ( Δ _d,n ) by design at the time of long-term behavior ( n+m ): 391mm if

Meanwhile, FIG. 4 is a graph showing the initial design value (blue) for the amount of deflection and the updated value (red) based on the relaxation function measured at the present time in Example 1;

In the case of Example 1,

Therefore, it is determined to be 'normally good' as an indicator for glass management of the structure.

Measurement time n: 5 years, current ( n ) deflection ( Δ _n ): 199mm, current ( n ) design deflection ( Δ _d,n ): 218 mm, long-term behavior n+m: 35 years, above The amount of deflection ( Δ _n+m ) at the time of long-term behavior ( n+m ) calculated by the management target amount calculation unit 30: 416mm, the amount of deflection ( Δ _d,n ) at the time of long-term behavior ( n+m ): 391mm if

Meanwhile, FIG. 5 is a graph showing an initial design value (blue) and an updated value (red) for the amount of deflection measured at the present time and updated based on the relaxation function in Example 2;

In the case of Example 2,

Therefore, it is decided as a 'slightly careful' state as an indicator for glass management of the structure.

Measurement time n: 5 years, current ( n ) deflection ( Δ _n ): 258 mm, current ( n ) design deflection ( Δ _d,n ): 218 mm, long-term operation time n+m: 35 years, above The amount of deflection ( Δ _n+m ) at the time of long-term behavior ( n+m ) calculated by the management target amount calculation unit 30: 350mm, the amount of deflection ( Δ _d,n ) by design at the time of long-term behavior ( n+m ): 391mm if

Meanwhile, FIG. 6 is a graph showing the initial design value (blue) for the amount of deflection and the updated value (red) based on the relaxation function measured at the present time in Example 3;

In the case of Example 3,

Therefore, it is determined as a 'normal boundary' state as an indicator of glass management of the structure.

Measurement time n: 5 years, current ( n ) deflection ( Δ _n ): 321 mm, current ( n ) design deflection ( Δ _d,n ): 218 mm, long-term operation time n+m: 35 years, above The amount of deflection ( Δ _n+m ) at the time of long-term behavior ( n+m ) calculated by the management target amount calculation unit 30: 450mm, the amount of deflection by design ( Δ _d,n ) at the time of long-term behavior ( n+m ): 391mm if

Meanwhile, FIG. 7 is a graph showing an initial design value (blue) for the amount of deflection and an updated value (red) based on the relaxation function measured at the present time in Example 4;

In the case of Example 4,

Therefore, it is determined to be 'very serious' as an indicator for glass management of the structure.

The structure maintenance index calculation system (S) and method (M) in consideration of long-term behavior by relaxation according to the present invention as described above, those of ordinary skill in the art to which the present invention pertains are the technical ideas of the present invention However, it will be understood that the present invention may be embodied in other specific forms without changing essential features.

Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive, and the scope of the present invention is indicated by the claims to be described later rather than the above detailed description, the meaning of the claims and All changes or modifications derived from the scope and its equivalents should be construed as being included in the scope of the present invention.

S: Structure maintenance index calculation system
D:Database T:Terminal
P: processing device 10: physical property measurement unit
20: relaxation function calculation unit 30: management target amount calculation unit
40: maintenance index calculation unit 50: segmentation index calculation unit
M: Calculation method of structure maintenance index
S10: Physical property measurement step S20: Relaxation function calculation step
S30: Calculation of management target amount S40: Calculation of maintenance index
S50: Segmentation index calculation stage

Claims (10)

a relaxation function calculator 20 for calculating a relaxation function based on the physical properties of the nano-indentation test for a structure;
Based on the relaxation function calculated by the relaxation function calculation unit 20 and the finite element analysis of the structure, the management target amount calculation unit 30 for calculating the management target amount ( Δ _n+m ) at the time of long-term behavior ); and
The actual management target amount at the present time ( Δ _n ), the design management target amount ( Δ _d,n ), the design management target amount at the time of long-term behavior ( Δ _d,n+m ), and the estimated management target amount ( Δ _n+m ) using the maintenance index calculation unit 40 to calculate the maintenance index;
Structure maintenance index calculation system in consideration of long-term behavior by relaxation, characterized in that it comprises a.
According to claim 1,
The maintenance index calculation unit 40,
The ratio ( R _n ) of the actual control target ( Δ _n ) to the design control target ( Δ _d,n ) at the present time,
It is characterized in that the maintenance index is calculated based on the ratio ( R _n+m ) of the calculated management target amount ( Δ _n+m ) to the design management target amount ( Δ _d,n+m ) at the time of long-term operation. Structure maintenance index calculation system considering long-term behavior by relaxation.
3. The method of claim 2,
The maintenance index calculation unit 40,
When R _n < 1.0
If R _n+m < 1.0, it is calculated as 'good', if R _n+m > 1.0, it is calculated as 'caution',
When R _n > 1.0
Structure maintenance index calculation system considering long-term behavior by relaxation, characterized in that R _n+m < 1.0 is calculated as 'boundary' and if R _n+m > 1.0 as 'severe'.
4. The method of claim 3,
a subdivision indicator calculating unit 50 for calculating a subdivided maintenance indicator using the R _n and R _n+m ;
Structure maintenance index calculation system in consideration of long-term behavior by relaxation, characterized in that it further comprises.
5. The method of claim 4,
The subdivision index calculation unit 50,
Based on the value of C _n = ( R _n + R _n+m )/2, as a subdivided maintenance index, in relaxation Structure maintenance index calculation system considering the long-term behavior of
According to claim 1,
a physical property measurement unit 10 for measuring physical properties required to calculate a relaxation function by performing a nano-indentation test based on a sample for a structure;
Structure maintenance index calculation system in consideration of long-term behavior by relaxation, characterized in that it further comprises.
A relaxation function calculation step (S20) in which the relaxation function calculation unit 20 calculates a relaxation function based on the physical properties of the nano-indentation test for the structure;
A management object amount calculation step (S30) in which the management object amount calculation unit 30 calculates the management object amount ( Δ _n+m ) at the time of long-term behavior based on the calculated relaxation function and the finite element analysis for the structure; and
The maintenance index calculation unit 40 calculates the actual management target amount ( Δ _n ) at the present time, the design management target amount ( Δ _d,n ), and the design management target amount ( Δ _d,n+m ) at the time of long-term operation ) and a maintenance index calculation step (S40) of calculating a maintenance index using the calculated management target amount ( Δn _+m );
Structure maintenance index calculation method in consideration of long-term behavior by relaxation, characterized in that it comprises a.
8. The method of claim 7,
The maintenance index calculation step (S40) is,
The maintenance index calculation unit 40 calculates the ratio ( R _n ) of the actual management target amount ( Δn ) to the design management target amount ( Δd _{,n )} at the present time,
It is characterized in that the maintenance index is calculated based on the ratio ( R _n+m ) of the calculated management target amount ( Δ _n+m ) to the design management target amount ( Δ _d,n+m ) at the time of long-term operation. A method of calculating the structure maintenance index considering long-term behavior by relaxation.
9. The method of claim 8,
a subdivision indicator calculation step (S50) in which the subdivision indicator calculation unit 50 calculates a subdivided maintenance indicator using R _n and R _n+m ;
Structure maintenance index calculation method in consideration of long-term behavior by relaxation, characterized in that it further comprises.
8. The method of claim 7,
A physical property measurement step (S10) in which the physical property measurement unit 10 measures a property value required to calculate a relaxation function by performing a nano-indentation test based on a sample for the structure;
Structure maintenance index calculation method in consideration of long-term behavior by relaxation, characterized in that it further comprises.

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