KR20210024762A - Structural dynamic stability judgement system - Google Patents

Abstract

The present invention provides an emergency dynamic stability determination system of a structure, which comprises: a plurality of sensor units installed in a structure to sense behavior information of the structure when external force is applied thereto; a structure state determination unit determining a behavior state of the structure by using sensing information of the sensor unit and applying a plurality of stability determination references to determine the state of the structure; and a notification unit notifying the state of the structure. The structure state determination unit determines short-term stability, middle-term stability, and long-term stability of the structure and determines that the structure is in the stable state when the entire determination references are satisfied.

Description

Structural dynamic stability judgment system

The embodiment relates to an emergency dynamic stability determination system of a structure. More specifically, it relates to an emergency dynamic stability determination system for a structure capable of quickly and intuitively confirming the stability of a structure based on measurement data sensed from the external force when an external force is applied to the structure.

Large structures and facilities built in the process of developing into an industrial society are damaged due to defects in the design and construction process or various factors that were not considered at the time of design. Its safety is greatly threatened. For example, in the case of structures in which severe structural damage has occurred, there are frequent cases where the service life is shortened to a degree that is significantly less than the design service life planned at the time of design.

Accordingly, efforts to secure long-term safety and operability of building structures are urgently required. In particular, large structures such as buildings, bridges, and dams are constantly exposed to various operating loads, impacts from external objects, earthquakes, wind loads, wave loads, and corrosion. As a result, it has become an issue of great interest. In order to accurately diagnose the safety of such large structures, it is necessary to monitor the behavior of structures through appropriate experimental measurements, to analyze structural damage mechanically, and to diagnose damage through analysis technology to model structural damage.

In particular, a number of earthquakes have occurred in Korea, which was recently evaluated as a safe area for earthquakes, and concerns about earthquakes are increasing.

In order to respond to such earthquakes, various earthquake safety evaluation systems using earthquake signals have appeared. However, it takes a lot of time to evaluate the stability of a structure due to an earthquake, and there is a problem that rapid evacuation is not suitable for disaster response, which is a life.

Korean Patent Registration No. 10-1431237.

An object of the embodiment is to provide an emergency dynamic stability determination system of a structure that can intuitively check the state of the structure when an external force is applied to the structure.

The problem to be solved by the present invention is not limited to the problems mentioned above, and other problems not mentioned herein will be clearly understood by those skilled in the art from the following description.

An embodiment of the present invention, a plurality of sensor units that are installed in the structure to detect the behavior information of the structure when an external force is applied; A structure state determination unit determining a state of a structure by using the sensing information of the sensor unit, and determining a state of the structure by applying a plurality of stability determination criteria; And a notification unit notifying the state of the structure, wherein the structure state determination unit determines short-term stability, mid-term stability, and long-term stability of the structure, and determines that the structure is in a stable state when all criteria are satisfied. It provides an emergency dynamic stability determination system for structures.

Preferably, the sensor unit includes a plurality of accelerometers in the structure and a displacement meter disposed at the top of the structure, and the structure state determination unit compares the interfloor displacement ratio and Peak Ground Acceleration (PGA) from the plurality of accelerometers to It can be characterized by judging short-term stability.

Preferably, when the structure state determination unit determines the short-term stability, the interfloor displacement ratio and the PGA value are divided into safety, caution, warning, and danger stages, and the risk of the interfloor displacement ratio and the PGA value is The risk is determined based on the high, but may be characterized by using the PGA value as an auxiliary indicator.

Preferably, the structure state determination unit may be characterized in that, when the PGA value is determined to be at least the caution level, determine the state of the structure as the caution level even when a signal of the safe state of the inter-floor displacement ratio is received.

Preferably, the sensor unit includes a plurality of accelerometers in the structure and a displacement meter disposed at the top of the structure, and the structure state determination unit compares the interfloor displacement ratio and the natural frequency change rate of the structure from the plurality of accelerometers to It may be characterized by determining stability.

Preferably, the structure state determination unit divides the interfloor displacement ratio into safety, caution, warning, and danger stages, and the natural frequency change rate is divided into safety and caution stages, and a risk stage among the interfloor displacement ratio and the natural frequency change rate It may be characterized in that it is judged as a safety degree of the structure that is high.

Preferably, the sensor unit includes a plurality of accelerometers in the structure and a displacement meter disposed at an uppermost end of the structure, and the structure state determination unit includes safety, caution, warning, and danger steps according to a range of the elastic displacement ratio of the uppermost end of the structure. It can be characterized by being divided into.

Preferably, the sensor unit includes a plurality of accelerometers, displacement meters, and anemometers installed in the structure, and the structure state determination unit calculates an interfloor displacement ratio from a plurality of accelerometers and an average wind speed for a preset time measured from the anemometer. It may be characterized in that the short-term stability of the structure is judged by comparison.

Preferably, when the determination unit determines the short-term stability, the interfloor displacement ratio and the average wind speed value are divided into safety, caution, warning, and danger stages, and the risk is high among the interfloor displacement ratio and the average wind speed value. The risk is determined based on that, but the average wind speed value may be used as an auxiliary indicator.

Preferably, the determination unit may be characterized in that, when the average wind speed value is determined as the caution level or higher, determines the state of the structure as the caution level even when a signal of the safe state of the inter-floor displacement ratio is received.

Preferably, the structure state determination unit determines the risk of the structure in stages, but determines the primary stability based on the initial motion signal sensed by the sensor unit, and if displacement occurs in the structure, based on the displacement of the structure. It may be characterized by determining the secondary stability.

Preferably, the notification unit may display real-time movement of the structure by modeling detection values of an accelerometer, a displacement meter, and an anemometer included in the sensor unit.

Preferably, the notification unit may be characterized in that the displacement of the structure is displayed on the screen in real time, such as a lateral movement and an upper movement, and a wind direction and wind speed acting on the structure.

According to the embodiment, when an external force such as an earthquake or a typhoon acts, there is an effect of intuitively checking the state of the structure.

In addition, it is possible to quickly determine the stability of the structure, thereby minimizing secondary damage caused by external force.

Various and beneficial advantages and effects of the present invention are not limited to the above description, and will be more easily understood in the course of describing specific embodiments of the present invention.

1 is a structural diagram of an emergency dynamic stability determination system of a structure according to an embodiment of the present invention,
FIG. 2 is a diagram showing short-term stability determination criteria due to an earthquake in the structure state determination unit, which is the configuration of FIG. 1,
FIG. 3 is a diagram showing a standard for determining short-term stability due to a typhoon in the structure state determination unit of FIG. 1,
FIG. 4 is a diagram showing a medium-term stability determination criterion of a structure in a structure state determination unit, which is a configuration of FIG. 1,
5 is a diagram illustrating a screen of a notification unit, which is the configuration of FIG. 1.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

However, the technical idea of the present invention is not limited to some embodiments to be described, but may be implemented in various different forms, and within the scope of the technical idea of the present invention, one or more of the constituent elements may be selectively selected. It can be combined with and substituted for use.

In addition, terms (including technical and scientific terms) used in the embodiments of the present invention are generally understood by those of ordinary skill in the art, unless explicitly defined and described. It can be interpreted as a meaning, and terms generally used, such as terms defined in a dictionary, may be interpreted in consideration of the meaning in the context of the related technology.

In addition, terms used in the embodiments of the present invention are for describing the embodiments and are not intended to limit the present invention.

In the present specification, the singular form may also include the plural form unless specifically stated in the phrase, and when described as “at least one (or more than one) of A and (and) B and C”, it is combined with A, B, and C. It may contain one or more of all possible combinations.

In addition, terms such as first, second, A, B, (a), and (b) may be used in describing the constituent elements of the embodiment of the present invention.

These terms are only for distinguishing the component from other components, and are not limited to the nature, order, or order of the component by the term.

And, when a component is described as being'connected','coupled' or'connected' to another component, the component is not only directly connected, coupled, or connected to the other component, but also with the component. It may also include the case of being'connected','coupled' or'connected' due to another element between the other elements.

In addition, when it is described as being formed or disposed on the “top (top) or bottom (bottom)” of each component, the top (top) or bottom (bottom) is one as well as when the two components are in direct contact with each other. It also includes the case where the above other component is formed or disposed between the two components. In addition, when expressed as "upper (upper) or lower (lower)", the meaning of not only an upward direction but also a downward direction based on one component may be included.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings, but the same reference numerals are assigned to the same or corresponding components regardless of the reference numerals, and redundant descriptions thereof will be omitted.

1 to 5, in order to clearly understand the present invention conceptually, only the main characteristic parts are clearly shown, and as a result, various modifications of the illustration are expected, and the scope of the present invention is limited by the specific shape shown in the drawings. It doesn't have to be.

An object of the present invention is to determine the stability of a structure against an applied external force in a short-term, medium-term, and long-term, and to evaluate the stability of the structure accordingly.

1 is a structural diagram of a system for determining emergency dynamic stability of a structure according to an embodiment of the present invention.

Referring to FIG. 1, an emergency dynamic stability determination system for a structure according to an embodiment of the present invention may include a sensor unit 100, a structure state determination unit 200, and a notification unit 300.

The sensor unit 100 is installed on a structure and may detect the behavior information of the structure when an external force is applied to the structure. There is no limitation on the type of structure, and it can be applied in various ways to structures such as buildings and other industrial facilities.

In addition, there are no restrictions on the type of external force, and it can include all natural disasters such as earthquakes and typhoons that may affect the safety of the structure.

The sensor unit 100 is installed on a structure, and various devices for detecting movement of the structure may be used when an external force is applied to the structure.

In one embodiment, the structure may be an accelerometer, a displacement meter, an anemometer, or the like.

The accelerometer may be provided in a plurality of structures to measure acceleration acting on the structure, or may indirectly measure the displacement of the structure through double integration of the measured acceleration.

In one embodiment, the accelerometer may be installed at the lower, middle, and upper portions of the structure to obtain acceleration and displacement at a specific point applied to the structure.

The displacement meter is installed on the top of the structure, and unlike the accelerometer, the structure can directly measure the displacement. In one embodiment, the displacement meter may use GPS.

In addition, the anemometer may detect movement according to the influence of wind applied to the structure.

The structure state determination unit 200 may determine the behavioral state of the structure by using the sensing information of the sensor unit 100, and may determine the state of the structure by applying a plurality of stability determination criteria.

The structure state determination unit 200 may determine the short-term stability, mid-term stability, and long-term stability of the structure, and may determine the state of the structure as a stable state when all the determination criteria are satisfied.

The structure state determination unit 200 may determine the level of risk of the structure by dividing the steps.

The structure state determination unit 200 may determine the primary stability of whether an event (earthquake or typhoon, etc.) has occurred based on the initial motion signal detected by the sensor unit 100. Secondary stability can be judged on the basis of it.

In one embodiment, when an earthquake occurs, it may be determined whether or not an earthquake has occurred based on a Peak Ground Acceleration (PGA) value detected by the sensor unit 100. When it is determined that an earthquake has occurred, the structure state determination unit 200 may determine the secondary stability based on the displacement of the structure.

In the case of a typhoon, if the average wind speed for a certain period of time exceeds a preset criterion, it is determined firstly that a typhoon has occurred, and a second stability determination is made based on the displacement of the structure.

FIG. 2 is a diagram illustrating a short-term stability determination criterion due to an earthquake in the structure state determination unit 200 of FIG. 1.

With reference to FIG. 2, a method of determining the short-term stability of the structure state determination unit 200 when an earthquake occurs will be described.

When an earthquake occurs, the structure state determination unit 200 may receive an inter-floor displacement ratio and a Peak Ground Acceleration (PGA) value from a plurality of accelerometers, and determine the short-term stability of the structure based on this.

Referring to FIG. 2, the interfloor displacement ratio and the PGA value can be divided into safety (OP), caution (IO), warning (LS), and danger (CP) stages. The range of steps may vary depending on the type of structure, the height of the structure, or the condition of the ground.

Each of the reference values classified by the structure state determination unit 200 may be designated in advance by an administrator or may be designated according to a design standard of the structure.

Referring to FIG. 2A, when the PGA value is safe (OP), short-term stability is determined according to the interlayer displacement ratio.

The short-term stability is determined based on the high risk among the interlayer displacement ratio and PGA value, but the interlayer displacement ratio is used as a first factor, and the PGA value can be used as a second factor.

Referring to FIG. 2B, when the PGA value is determined as caution (IO), short-term stability is determined as caution (IO) even if the inter-floor displacement ratio appears as safety (OP). In the remaining cases, short-term stability is judged according to the inter-floor displacement ratio.

2C and 2D, when the PGA value is determined as warning (LS) or danger (CP), even if the interfloor displacement ratio appears as safety (OP) or caution (IO), short-term stability is all It is judged as a caution (IO) stage, and the rest are judged for short-term stability according to the inter-floor displacement ratio.

The short-term stability judgment is based on the inter-floor displacement ratio, which has the greatest effect on the structure in the event of an earthquake, but if the PGA value is judged to be above caution (IO) even if the inter-floor displacement ratio is judged as a safe state, pay attention to the short-term stability (IO). Can be determined by

This reflects that the risk of the structure increases when an abnormal signal occurs in the ground acceleration even if no inter-floor displacement occurs.

FIG. 3 is a diagram illustrating a standard for determining short-term stability due to strong winds such as typhoons in the structure state determination unit 200 of FIG. 1.

The case of FIG. 3 is for explaining a case in which a typhoon, not an earthquake, acts as a force acting as an external force, and an average wind speed for a preset time is used as a comparison value instead of a PGA value.

Referring to FIG. 3A, when the average wind speed value for 3 seconds is safe (OP), short-term stability is determined according to the interfloor displacement ratio.

The short-term stability is judged based on the high risk among the interfloor displacement ratio and the 3-second average wind speed value, but the inter-floor displacement ratio is used as the first factor, and the 3-second average wind speed value can be used as a second factor. have.

Referring to FIG. 2B, when the average wind speed value of 3 seconds is determined as caution (IO), short-term stability is determined as caution (IO) even if the inter-floor displacement ratio appears as safety (OP). In the remaining cases, short-term stability is judged according to the inter-floor displacement ratio.

Referring to Figure 2 (C) and (D), when the average wind speed value of 3 seconds is determined as warning (LS) or danger (CP), even if the inter-floor displacement ratio appears as safety (OP) or caution (IO), short-term All stability is judged at the attention (IO) stage, and the rest are judged for short-term stability according to the inter-floor displacement ratio.

The short-term stability determination is based on the inter-floor displacement ratio according to the actual structure behavior in the event of a typhoon, but even if the inter-floor displacement ratio is judged to be in a safe state, pay attention to the short-term stability if the average wind speed value of 3 seconds is judged to be above caution (IO) ( IO).

FIG. 4 is a diagram illustrating a medium-term stability criterion for a structure in the structure state determination unit 200, which is a configuration of FIG. 1.

Referring to FIG. 4, in the determination of mid-term stability, the mid-term stability is determined by comparing the interfloor displacement ratio and the rate of change of the natural frequency of the structure.

The rate of change of the natural frequency of the structure can be checked by measuring the natural frequency of the structure over a certain period of time. The rate of change of the natural frequency can be calculated by the following equation.

Natural frequency change rate = (natural frequency after earthquake-normal natural frequency)/normal natural frequency

The method of measuring the rate of change of the natural frequency is not limited, and various known methods may be used.

4(A) shows the case where the natural frequency change rate is safety (OP), and FIG. 4(B) shows the case where the natural frequency change rate is caution (IO).

Unlike the PGA value, the natural frequency change rate divides the entire stage into only the stable (OP) and caution (IO) stages.

This is because the natural frequency change rate is judged as normal or abnormal depending on whether it is within a certain range or out of a certain range, so it can be divided into two stages: stability (OP) and caution (IO).

The medium-term stability is judged according to the inter-floor displacement ratio, but if the natural frequency change rate is judged as caution (IO), the medium-term stability is judged as caution (IO) even if the inter-floor displacement ratio is judged as safety (OP).

The long-term stability criterion is based on displacement information measured from a displacement measuring instrument disposed at the top of the structure. Long-term stability, unlike other criteria, is judged by its own index (elastic displacement at the top of the structure).

Table 1 is an example of the criteria for determining long-term stability. division range Safety (OP) Displacement ratio of uppermost tansheng<80% Attention (IO) 80%<elastic displacement ratio of the uppermost part<99% Warning (LS) 99% <elastic displacement ratio of the uppermost part <120% Risk (CP) 120%<elastic displacement ratio at the top end

Referring to Table 1, the criteria for determining long-term stability may be based on a ratio of the elastic displacement of the uppermost end to a reference value. The reference value of the elastic displacement may vary depending on the type of structure. The ranges set in Table 1 are only examples, and may be set according to various factors such as the type of structure and the ground. As such, the structure state determination unit 200 uses information detected by the sensor unit 100. Accordingly, the level of safety can be determined from a short-term, mid-term, and long-term perspective of the state of the structure, and when a signal of more than one caution is transmitted according to these three criteria, a signal can be transmitted to the notification unit 300. ) May receive the state of the structure from the structure state determination unit 200 and inform the manager or occupant.

5 is a diagram illustrating a screen of the notification unit 300 configured in FIG. 1.

Referring to FIG. 5, the notification unit 300 may indicate the state of the structure on a screen so that the state of the structure can be intuitively checked.

First, it is possible to transmit a plurality of information related to the displacement of the structure.

The notification unit 300 may display displacement information obtained from an accelerometer. In this case, it is possible to indicate the location where each accelerometer is installed. In addition, it is possible to increase the reliability by allowing the displacement measured directly from the GPS displacement meter to be displayed together.

The screen showing the displacement can display a dynamic screen that moves in real time according to the displacement of the structure, and the limit line of displacement can be divided into safety, need for inspection, severe damage, etc., and the safety status of the structure can be checked only by displaying the screen. .

In addition, displacement may be indicated at the top of the structure so that displacement information of the structure can be confirmed in three dimensions.

In one embodiment, the notification unit 300 may display the wind direction and wind speed acting on the structure on the screen, and may display the moving direction of the position of the GPS displacement meter in the east, west, north and south directions.

As described above, with reference to the accompanying drawings with respect to an embodiment of the present invention was looked at in detail.

The above description is merely illustrative of the technical idea of the present invention, and those of ordinary skill in the technical field to which the present invention belongs can make various modifications, changes, and substitutions within the scope not departing from the essential characteristics of the present invention. will be. Accordingly, the embodiments disclosed in the present invention and the accompanying drawings are not intended to limit the technical idea of the present invention, but are for illustrative purposes, and the scope of the technical idea of the present invention is not limited by these embodiments and the accompanying drawings. . The scope of protection of the present invention should be construed by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

100: sensor unit
200: structure state determination unit
300: notification unit

Claims (13)

A plurality of sensor units installed on the structure to detect behavior information of the structure when an external force is applied;
A structure state determination unit that determines a behavior state of the structure using the sensing information of the sensor unit, and determines the state of the structure by applying a plurality of stability determination criteria; And
A notification unit notifying the state of the structure;
Including,
The structure state determination unit determines the short-term stability, mid-term stability, and long-term stability of the structure, and determines that the structure is in a stable state when all criteria are satisfied. The method of claim 1,
The sensor unit includes a plurality of accelerometers in the structure and a displacement meter disposed at an uppermost end of the structure,
The structure state determination unit determines the short-term stability of the structure by comparing the inter-floor displacement ratio and Peak Ground Acceleration (PGA) from a plurality of accelerometers. The method of claim 2,
When the structure state determination unit determines the short-term stability,
The interfloor displacement ratio and the PGA value are divided into safety, caution, warning, and danger stages, and the level of risk is determined based on the high risk among the interlayer displacement ratio and the PGA value, and the PGA value is used as an auxiliary indicator. Emergency dynamic stability determination system of a structure, characterized in that. The method of claim 3,
The structure state determination unit, when it is determined that the PGA value is greater than or equal to the caution level, determines the state of the structure as the caution level even when a signal of the safety state of the inter-floor displacement ratio is received. The method of claim 1,
The sensor unit includes a plurality of accelerometers in the structure and a displacement meter disposed at an uppermost end of the structure,
The structure state determination unit determines the intermediate-term stability of the structure by comparing the inter-floor displacement ratio and the natural frequency change rate of the structure from a plurality of accelerometers. The method of claim 5,
The structure state determination unit divides the interfloor displacement ratio into safety, caution, warning and danger stages, and the natural frequency change rate into safety and caution stages,
The emergency dynamic stability determination system of a structure, characterized in that it is determined as a safety degree of the structure that the risk level is high among the inter-floor displacement ratio and the natural frequency change rate. The method of claim 1,
The sensor unit includes a plurality of accelerometers in the structure and a displacement meter disposed at an uppermost end of the structure,
The structure state determination unit classified into safety, caution, warning, and danger stages according to a range of an elastic displacement ratio of an uppermost end of the structure. The method of claim 1,
The sensor unit includes a plurality of accelerometers, displacement meters, and anemometers installed on the structure,
The structure state determination unit determines the short-term stability of the structure by comparing an inter-floor displacement ratio from a plurality of accelerometers and an average wind speed for a predetermined period of time measured from the anemometer. The method of claim 8,
When the determination unit determines the short-term stability,
The interfloor displacement ratio and the average wind speed value are divided into safety, caution, warning, and risk stages, and the risk level is determined based on the high risk among the interfloor displacement ratio and the average wind speed value, and the average wind speed value is used as an auxiliary indicator. An emergency dynamic stability determination system of a structure, characterized in that utilizing. The method of claim 9,
The determination unit, when it is determined that the average wind speed value is greater than or equal to the caution level, determines the state of the structure as the caution level even when a signal of the safety state of the interfloor displacement ratio is received. The method of claim 1,
The structure state determination unit determines the level of risk of the structure by dividing the stages, but determines the primary stability based on the initial motion signal detected by the sensor unit, and determines the secondary stability based on the displacement of the structure when a displacement occurs in the structure. Emergency dynamic stability determination system of a structure, characterized in that to determine. The method of claim 1,
The notification unit is an emergency dynamic stability determination system of a structure, characterized in that by modeling the sensing values of an accelerometer, a displacement meter, and an anemometer included in the sensor unit to indicate real-time movement of the structure. The method of claim 12,
The notification unit is an emergency dynamic stability determination system of a structure, characterized in that the displacement of the structure is displayed on a screen in real time, such as side movements and upper movements, and wind direction and wind speed acting on the structure.

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