KR20120083696A - Apparatus and system for measuring deformation of concrete structure under blast loading - Google Patents

Abstract

PURPOSE: A device and a system for measuring the strain of a structure caused by a blaster load are provided to accurately measure a blaster load applied to a structure specimen and to confirm explosion proof efficiency of the structure specimen by preciously measuring strain caused by the blaster load. CONSTITUTION: A device for measuring the strain of a structure caused by a blaster load comprises a lower plate unit, a lateral wall unit(120), a structure restrainer(130), a fragment accommodating unit(140), a structure strain measuring unit, and a pressure sensor unit. The lateral wall unit being arranged on the top of the lower plate unit comprises a lateral wall forming a hollow. The structure restrainer being arranged on the top of the lateral wall unit seals the lateral wall unit by restraining the structure specimen in the inside. The fragment accommodating unit is arranged in the inside of the lateral wall unit to accommodate fragments when the fragments of the structure specimen are generated by an external blaster load. The structure strain measuring unit measures the strain of the structure specimen. The pressure sensor unit measures the blast load in which the structure specimen receives.

Description

Apparatus and system for measuring the deformation of structures according to the explosion load {APPARATUS AND SYSTEM FOR MEASURING DEFORMATION OF CONCRETE STRUCTURE UNDER BLAST LOADING}

The present invention relates to an apparatus and a system for measuring the deformation of a structure according to an explosion load. In particular, the present invention relates to an apparatus and system for precisely measuring how deformed a structure, such as a concrete panel used in civil engineering and building structures, by an explosion load.

The study of the effect of concrete structures by the explosion pressure loads has been actively conducted since the Second World War. When the large pressure loads are applied to civil and military structures in a short time due to explosion, shock, terrorism, war, etc. We began to pay attention to what this behavior was.

Such research is still underway in the United States and Europe, but is closely related to national security, so it is limited by technicians in areas that are relatively exposed to risk factors such as the defense industry or the petrochemical industry. Research has been conducted.

However, recently, due to the increase of terrorism and crime such as 9.11 terrorism, the concept of protection design is needed not only for military facilities but also for infrastructure and civilian facilities, and for this purpose, an independent protection technology through research on the behavior of structures subjected to explosion loads. There is a need for building the system.

 Structural behavior against explosion load is evaluated and approximated by Biggs (1964) using the lumped mass model of the terminal inductometer (SDOF) and the multiple freedom meter (MDOF) by Biggs (1964). In this paper, we propose a technique that can be designed as an example. Recently, HFPB (High Fidelity Physics) applying an appropriate material model and finite element modeling considering strength explosion effect and strain rate in consideration of explosion load characteristics to improve the accuracy and reliability of analysis results using this approximate and simplified model Based) Finite element analysis techniques are being actively researched.

In Korea, HFPB finite element analysis techniques are being conducted, which are able to secure higher accuracy than existing simple analysis techniques, and they are constructing protection designs and analysis of independent structures not only for military facilities but also for social infrastructure.

However, in order to analyze the behavior (deformation) of the structure against the explosion load, not only an analytical technique but also an apparatus and a system capable of precisely measuring the deformation of the structure are required. Since the explosion load transmits a very large load in a short time, if the measuring device does not provide a stable and accurate measuring method, there is a problem that damage or incorrect measurement of the measuring device occurs.

An apparatus and system for measuring deformation of a structure according to an explosion load according to the present invention aims to solve the following problems.

First, the present invention intends to increase the accuracy of the measurement of structural deformation according to the explosion load.

Second, to accurately measure the explosion-proof performance of the concrete structure using the present invention.

Third, the present invention allows to safely perform the structural deformation measurement according to the explosion load.

The solution to the problem of the present invention is not limited to those mentioned above, and other solutions not mentioned can be clearly understood by those skilled in the art from the following description.

Apparatus for measuring the deformation of the structure according to the explosion load according to the present invention is disposed on the lower plate portion, the upper side of the lower plate portion, the side wall portion having a side wall to form a hollow, is disposed on the top of the side wall portion, the structure specimen Structure restraint which constrains the side wall part and restrains the structural specimen by external explosive force, the fragment receiving part disposed inside the side wall part to receive the fragment, the structural specimen to measure the deformation of the structural specimen. It is disposed in the structure deformation measurement unit and the pressure sensor holder portion embedded in the upper surface of the structure specimen, and includes a pressure sensor unit for measuring the explosion pressure received by the structure specimen from the external explosion force.

Apparatus for measuring the deformation of the structure according to the explosion load according to the present invention is in the form of a flat plate made of a concrete material, and further comprises a base portion disposed on the upper plate portion.

The side wall portion according to the present invention is composed of a steel, characterized in that the cross-sectional shape is a column shape of any one of a circle, oval, polygon.

The structure restraint according to the present invention is disposed on an upper side of the side wall portion, and includes a receiving frame having a cross-sectional shape, such as a structural specimen, and one or more close means for closely contacting the structural specimen and the receiving frame. Characterized in that it extends in the outward direction than the side wall of the side wall portion.

Structure restraint according to the present invention is characterized in that it further comprises a protective plate of a flexible material disposed in contact between the receiving frame and the structure specimen, the contact means is placed in contact with the portion of the structure specimen to apply pressure.

The contact means according to the invention is characterized in that at least one clamp for clamping the structure specimen and the receiving frame.

The fragment receiving portion according to the present invention is characterized in that the plate is arranged between the structure restraint portion and the lower plate portion partitioning the inside of the side wall portion to the upper and lower.

The fragment receiving portion according to the present invention is characterized in that it is composed of a soft synthetic resin or rubber.

Device for measuring the deformation of the structure according to the explosion load according to the present invention, the structure deformation measuring unit is disposed in contact with one or more strain measuring sensors on one or more sides of the upper or lower side of the structure specimen, the contact arrangement on the lower side of the structure specimen The at least one accelerometer and the main body are fixed on the bottom plate, and the displacement transfer unit for measuring the distance displacement of the structure specimen includes one or more LVDTs in contact with the lower side of the structure specimen, the displacement transfer portion of the LVDT When passing through the receiving portion, the displacement transfer portion of the LVDT is characterized in that it has a structure passing through the fragment receiving portion.

In the apparatus for measuring the explosion load according to the present invention, the main body is fixed on the bottom plate, or fixed to the side wall of the side wall, the displacement transmission unit for measuring the displacement of the receiving frame of the structure restraint part is in contact with the lower side of the receiving frame In addition to the above LVDT, when the displacement transmitting portion of the LVDT passes through the debris receiving portion, the displacement transmitting portion of the LVDT is characterized in that it has a structure penetrating through the debris receiving portion.

The pressure sensor unit according to the present invention is characterized by measuring the explosion pressure received only by the structural specimen, including the reflection pressure by the external explosion.

The system for measuring the deformation of a structure according to the explosion load according to the present invention is an explosion load calculation unit for calculating the explosion load transferred to the structure specimen in the external explosion, pressure gauge and structure for measuring the explosion pressure received by the structure specimen Deformation calculation unit for calculating the deformation data for measuring the deformation of the structure using a sensor for measuring the strain of the specimen, strain calculation unit for receiving the strain data calculated from the deformation data calculation unit to calculate the strain of the structure specimen, deformation Deformation energy obtained by subtracting the absorbed energy estimated by the absorbed energy estimating unit from the absorbed energy estimating unit which estimates the absorbed energy in the structural specimen using the strain data calculated by the data calculating unit The strain of the structural specimen calculated by the strain calculator Strains studied to be characterized in that it comprises a.

Deformation data calculation unit according to the present invention is disposed on the lower plate, the upper side of the lower plate, the side wall case having a side wall to form a hollow, the structure restraint plate for sealing the side wall case by restraining the structure specimen inside the outside, outside When fragments of structural specimens are generated by explosive force, the fragment receiving plate disposed inside the sidewall case to receive the fragments, the structural strain measurement sensor group disposed on the structural specimens to measure the strain of the structural specimens, and the upper surface of the structural specimens. It is disposed in the pressure sensor holder portion embedded in, characterized in that it comprises a pressure gauge for measuring the explosion pressure received by the structure specimen from the external explosion force.

Side wall case according to the present invention is composed of a steel, characterized in that the cross-sectional shape of any one of a columnar shape of a circle, oval, polygon.

The structure restraint plate according to the present invention is disposed on the top of the side wall case, and includes a receiving frame having a cross-sectional shape, such as a structural specimen, on which the structural specimen is placed, and one or more contact means for closely contacting the structural specimen and the receiving frame. The frame is characterized in that it extends in the outward direction than the side wall of the side wall case.

Structure restraint plate according to the invention is characterized in that it further comprises a protective plate of a flexible material disposed in contact between the receiving frame and the structure specimen, the contact means is placed in contact with the portion of the structure specimen to apply pressure.

The contact means according to the invention is characterized in that at least one clamp for clamping the structure specimen and the receiving frame.

The fragment receiving plate according to the present invention is characterized in that the plate is arranged between the structure restraint plate and the lower plate to partition the inside of the side wall case to the upper and lower.

The fragment receiving plate according to the present invention is characterized in that it is composed of soft synthetic resin or rubber.

Structural strain measurement sensor group according to the present invention is one or more strain measurement sensors disposed in contact with at least one side of the upper surface or the lower surface of the structure specimen, one or more acceleration measurement sensors disposed in contact with the lower side of the structure specimen and the lower plate Displacement of the LVDT when the displacement transfer portion of the LVDT is secured on and includes a displacement transfer portion for measuring a distance displacement of the structure specimen in contact with the underside of the structure specimen, the displacement transfer portion of the LVDT passing through the debris receiving plate. The part is characterized by having a structure penetrating the debris receiving plate.

One or more LVDTs in which the deformation data calculation unit according to the present invention is fixed on the bottom plate or fixed to the side wall of the side wall case, and the displacement transmission unit for measuring the displacement of the receiving frame of the structure restraint are in contact with the lower side of the receiving frame. Further comprising, if the displacement transmission portion of the LVDT passes the debris receiving plate, the displacement transmission portion of the LVDT is characterized in that it has a structure passing through the debris receiving plate.

The pressure gauge according to the present invention is characterized by measuring the deformation of the structure according to the explosion load, characterized in that for measuring the explosion pressure received only by the structural specimen, including the reflection pressure by the external explosion.

Apparatus and system for measuring the deformation of a structure according to the explosion load according to the present invention has the following effects.

First, it is possible to accurately determine the explosion load received by the structural specimens, and to determine the explosion-proof performance of the structural specimens by precisely measuring the deformation according to the explosion load.

Secondly, according to the explosion proof performance of the structural specimens, the structural specimens are placed in the proper places for the civil and architectural structures to effectively improve the explosion-proof performance of the civil and architectural structures.

Third, in the apparatus for measuring the structure deformation, by separately receiving the debris due to the destruction of the structure specimen, the measurement sensor is accurately measured without destroying the measurement sensor.

Fourth, by measuring the energy received by the explosion load and the structural specimen, it is possible to examine whether the structural deformation measuring apparatus of the present invention accurately measured the deformation.

The effects of the present invention are not limited to those mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the following description.

Figure 1 is a side cross-sectional view of a device for measuring the deformation of the structure according to the explosion load according to the present invention (various measurement units not shown).
Figure 2 shows an example of the side wall portion of the present invention, Figure 2 (a) is a perspective view of the side wall portion consisting of four rectangular side walls, Figure 2 (b) is a side view of the side wall inner side surface. .
Figure 3 shows an example of the structure constraints of the present invention, Figure 3 (a) is a side cross-sectional view of the structure constraints, Figure 3 (b) is a plan view of the structure constraints 130, Figure 3 ( c) is a partially enlarged side sectional view in which the clamp of the structure restraint is installed.
Figure 4 is a plan view showing an example of the fragment receiving portion of the present invention.
Figure 5 is a side cross-sectional view showing an example of the position of the various measuring units disposed in the apparatus for measuring the deformation of the structure according to the present invention.
Figure 6 is a side cross-sectional view schematically showing the position of the sensor constituting the structure deformation measuring unit and the sensor constituting the pressure thin line in accordance with the present invention.
Figure 7 is a plan view showing an example of the position of the various measuring devices installed on the structure specimen of the present invention, Figure 7 (a) shows the upper side of the structure specimen, Figure 7 (b) is the bottom of the structure specimen Show the side.
8 is a side view showing an example of the position of the strain measurement sensor disposed on the side wall of the side wall portion of the present invention.
FIG. 9 illustrates an example of a pressure sensor holder in which a pressure sensor unit of the present invention is disposed. FIG. 9 (a) shows a top plan view, and FIG. 9 (b) shows a pressure sensor holder and a pressure sensor. The actual picture is embedded in the structure specimen.
Figure 10 is a block diagram showing the configuration of a system for measuring the deformation of the structure according to the explosion load according to the present invention.
11 is a graph showing a screen for calculating the explosion pressure load received by the structure specimen using the ConWEP program.
12 is a graph illustrating an example of calculating the energy received by the structure specimen.

As used herein, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It is to be understood that the present invention means that there is a part or a combination thereof, and does not exclude the presence or addition possibility of one or more other features or numbers, step operation components, parts or combinations thereof.

Hereinafter, with reference to the drawings will be described in detail with respect to the apparatus and system for measuring the deformation of the structure according to the explosion load.

The present invention relates to an apparatus and a measurement system for analyzing the behavior (deformation) of a concrete structure when performing a blasting experiment to evaluate the effect of the pressure load due to the explosion and the protection performance.

Explosion refers to a kind of chemical reaction in which high energy is released at a very short rate due to high heat or impact. The explosive speed of general explosives ranges from 4,000 to 8,400 m / s, and the explosive speed of TNT, a representative explosive, is about 6,900 m. Since it is / s, it is very fast and large compared to the loads generally considered in civil engineering and architecture.

The dynamic load during a very short time caused by an explosion is a non-vibratory impact pressure load belonging to the impact zone, and the operating time is very short in about 1/1000 second. In general, as the action time of the load becomes shorter, the inertia effect becomes apparent. Explosion is composed of blast wave, debris from debris or debris of structure, high temperature heat, etc., with high pressure gas, among which blast wave acts at high temperature and pressure in structure It is considered as a pressure load.

As explosives, it is preferable to use explosives without an explosive case, such as ANFO. TNT explosives are difficult to measure the accurate explosion pressure because the steel case is formed on the outside, it may be difficult to accurately measure because the steel case is in addition to the pure pressure to the concrete specimen.

The effects of the explosion load affecting the structure can be classified into four categories, depending on the location of the explosion: free explosion in the atmosphere, atmospheric explosion, surface explosion and internal explosion. In the experiment for the present invention, the explosion load acts on the concrete slab structure by inducing free explosion in the air, and the free explosion in the air can measure the initial shock wave without disturbing the pressure such as the reflected wave.

The explosive load received by the concrete structure specimens by external explosion was measured using the ConWEP program. ConWEP can calculate the explosive load considering the effects of storm waves, debris, surface impacts, ball holes, etc. Among them, the explosive load can be calculated by considering the explosive angle in the case of storm waves. Can be.

1 is a side cross-sectional view of an apparatus 100 for measuring deformation of a structure according to an explosion load according to the present invention. 1 does not show a sensor for measuring strain.

Apparatus 100 for measuring the deformation of the structure according to the explosion load according to the invention is disposed on the lower plate portion 110, the lower plate portion 110, side wall portion 120 having a side wall to form a hollow, side wall The structure restraint unit 130 disposed on the upper part of the upper part 120 and constraining the structural specimen inside to seal the side wall part 120, when the fragment of the structural specimen is generated by an external explosive force, Debris receiving portion 140 disposed inside the side wall portion 120 to accommodate, the structure deformation measuring unit 150 disposed on the structure specimen to measure the deformation of the structure specimen and the pressure sensor holder embedded in the upper surface of the structure specimen It is disposed inside the part, and includes a pressure sensor unit 160 for measuring the explosion pressure received by the structure specimen from the external explosion force.

Furthermore, the device 100 for measuring the deformation of the structure according to the explosion load of the present invention is a flat plate made of a concrete material, the lower plate 110 may further include a base portion 170 is disposed on the top. have.

In the actual experiment for the present invention, the concrete structure (panel) was used as the structural specimen, but since the apparatus of the present invention is to measure the deformation of the structure due to the explosion load, the structural specimen is not limited to this, and various structures such as steel structures This is available.

The device 100 for measuring the deformation of a structure according to the explosion load of the present invention reduces the deformation of the device 100 for measuring the deformation itself, and the behavior of the concrete structure is different from that predicted by an unexpected additional pressure acting on the concrete structure specimen. It is advisable to install the measuring device under the ground in order to prevent it from being generated and to accept the pure explosion pressure, and to arrange the structure specimen and the ground to be flat.

In FIG. 1, the lower plate part 110 is disposed on an upper end of the base part 170 and is fixed to the base part 170 through a set anchor. As shown in Figure 1, the base portion 170 preferably extends further to the side than the lower plate portion 110 has a larger structure. The lower plate 110 is preferably in the form of a flat plate made of iron.

The size and position of each component shown in FIG. 1 and the drawings described below are merely numerical values used in the experiments for the present invention. It is obvious that a measuring device having various configurations of various sizes may be used depending on the size of the structure to be tested or the experimental environment.

Figure 2 shows an example of the side wall portion 120 of the present invention, Figure 2 (a) is a perspective view of the side wall portion 120 consisting of four rectangular side walls, Figure 2 (b) is a side wall portion ( 120) Side view of the inner side of the side wall.

The side wall part 120 may be made of steel, and may have a pillar shape having a cross-sectional shape of a circle, an oval, or a polygon. In FIG. 2, the side wall portion 120 is formed of four walls, and the cross section is square. As shown in FIG. 2, each sidewall of the sidewall portion 120 is preferably reinforced with sidewall stiffeners to reduce deformation due to explosion load.

3 illustrates an example of the structure restrainer 130 according to the present invention. FIG. 3 (a) is a side cross-sectional view of the structure restraint 130, and FIG. 3 (b) shows the structure restraint 130. 3C is a partially enlarged side sectional view in which the clamp of the structure restraint 130 is installed.

The structure restraint unit 130 is disposed on the upper side of the side wall portion 120 and has a cross-sectional shape such as a structure specimen to closely contact the receiving frame 131 on which the structural specimen is placed, and the structural specimen and the receiving frame 131. The above contact means 132 is included. Furthermore, the receiving frame 131 is preferably in a form extending further in the outward direction than the side wall of the side wall portion 120.

It is preferable to further include a protective plate 133 of a flexible material disposed in contact between the receiving frame 131 and the structure specimen, the contact means 132 is in contact with the portion of the structure specimen to apply pressure. As the protective plate 133 of the flexible material, a material such as synthetic resin or rubber may be used. Furthermore, as shown in FIG. 3 (a), the cover metal plate 134 may be installed on the protective plate 133 to be fixed to the structure specimen and the receiving frame 131 by the contact means 132.

As shown in FIG. 3 (a) and FIG. 3 (c) in which the circular display portions of FIG. 3 (a) are enlarged, the contact means 132 may be one or more clamps that clamp the structure specimen and the receiving frame. It is preferable to use a plurality of clamps in various aspects to securely hold the structural specimen.

The lower plate part 110, the side wall part 120, and the structure restraint part 130 form a housing structure in which a hollow is formed therein. When the structure restrainer 130 is mounted on the sidewall 120 and the structure specimen accommodated in the structure restraint 130 is in close contact with the receiving frame 131, the housing structure has a sealed shape.

4 is a plan view showing an example of the fragment receiving portion 140 of the present invention.

The fragment receiving portion 140 is disposed inside the side wall portion 120 to receive the fragment when fragments of the structural specimen are generated by an external explosive force. The debris receiving unit 140 is basically located in an area capable of receiving debris of the structure specimen. It may be placed in a suitable position depending on the aspect of the generation of fragments.

As shown in FIGS. 1 and 2, the fragment receiving portion 140 is disposed between the structure restraining portion 130 and the lower plate portion 110 to divide the inside of the side wall portion 120 into an upper portion and a lower portion. Is preferably.

The fragment receiving portion 140 is preferably made of soft synthetic resin or rubber. The fragment receiving portion 140 shown in FIG. 4 is in a form in which a flexible synthetic resin or the like is placed on the steel frame. Holes in the outer shell of the fragment receiving portion 140 of FIG. 4 are positions where bolts or clamps for fixing the fragment receiving portion 140 to the steel frame are installed.

Figure 5 is a side cross-sectional view showing an example of the position of the various measuring unit disposed in the apparatus 100 for measuring the deformation of the structure according to the invention, Figure 6 constitutes a structure deformation measurement unit 150 according to the present invention It is a side cross-sectional view schematically showing the position of the sensor and the sensor constituting the pressure thin line.

The structure deformation measuring unit 150 is a strain gauge for measuring the deformation of the structure specimen, and an acceleration measurement sensor for measuring the structure specimen when it is displaced downward while cracking is caused by the explosion load. ), And an LVDT 153 for measuring what is the downward displacement of the structure specimen.

Strain measurement sensors are available in a variety of sensors that can be used by those skilled in the art. The Linear Variable Differential Transformer (LVDT) is an electrical transducer that measures the linear distance difference. Three solenoid coils are located around the tube. The cylinder-shaped magnet core moves along the center of the tube and informs the position value of the measurement target.

The structure deformation measurement unit 150 may include one or more strain measurement sensors disposed in contact with at least one side of the upper and lower surfaces of the structure specimen, one or more acceleration measurement sensors disposed in contact with the lower surface of the structure specimen, and the main body on the lower plate. The displacement transfer unit 154, which is fixed and for measuring the distance displacement of the structure specimen, includes one or more LVDTs 153 in contact with the underside of the structure specimen.

In this case, when the displacement transmitting unit 154 of the LVDT passes the fragment receiving unit 140, the displacement transmitting unit 154 of the LVDT preferably has a structure passing through the fragment receiving unit 140.

The LVDT 153 can be selected in two ways to measure the displacement of structural specimens according to the movement of concrete specimens subjected to explosion load. Firstly, there is a spring type LVDT which is generally used, which can measure only the maximum deflection. Second, there is an unspring behavior LVDT. This is a way to measure the displacement of behavior caused by the structural specimen being subjected to an explosion load. Among these two LVDT methods, the user should select the desired LVDT. When using the unspring type LVDT, the LVDT fixing device should be installed at the displacement measuring position of the structural specimen and connected by screw. 5 and 6 illustrate an example of using the behavior LVDT of the unsping method for the LVDT installed in the center of the structure specimen.

As shown in Figure 6, the apparatus for measuring the explosion load according to the present invention is fixed on the lower plate, or fixed to the side wall of the side wall portion 120, while the displacement of the receiving frame of the structure restraint unit 130 The displacement transfer unit for measurement further comprises one or more LVDTs in contact with the underside of the receiving frame. In this case, when the displacement transmission unit of the LVDT passes the fragment receiving unit 140, the displacement transmission unit of the LVDT preferably has a structure that penetrates the fragment receiving unit 140.

The reason for measuring the displacement of the accommodating frame is to consider a case in which not only the structural specimen but also the accommodating frame for accommodating or supporting the structural specimen, the side wall part 120, and the like are deformed by the explosion load. In other words, if the receiving frame is moved downward by the explosion, this value is measured to accurately measure only the displacement value generated only by the structural specimen.

Figure 7 is a plan view showing an example of the position of the various measuring devices installed on the structure specimen of the present invention, Figure 7 (a) shows the upper side of the structure specimen, Figure 7 (b) is the bottom of the structure specimen The side is shown.

In FIG. 7, a 60 mm strain sensor was attached to the center of the concrete, 100 mm from the center to the top, and 230 mm from the center to the left side (FIG. 7 (a)). Figure 7 (b) shows a form in which the strain measuring sensor is attached to the opposite position.

FIG. 8 is a side view illustrating an example of a position of a strain measuring sensor disposed on a side wall of the side wall part 120 of the present invention. As described above, since the deformation occurring on the sidewall of the sidewall portion 120 affects the deformation measurement of the structural specimen, the strain measurement sensor disposed on the sidewall measures a reference correction value for measuring the accurate deformation of the structural specimen. It is to. In FIG. 8, in order to measure the strain of reinforcing bars, a total of four 5 mm strain gages are attached to the tension portions of both bars.

9 illustrates an example of a pressure sensor holder in which the pressure sensor unit 160 of the present invention is disposed. FIG. 9 (a) shows an upper plan view, and FIG. 9 (b) shows a pressure sensor holder. Is a real photograph of the structure specimen. 6 and 7 show an example of a position where the pressure sensor unit 160 is disposed.

The pressure sensor unit 160 is disposed inside the pressure sensor holder part embedded in the upper surface of the structure specimen, and measures the explosion pressure received by the structure specimen from the external explosion force. The pressure sensor unit 160 may measure the explosion pressure received only by the structural specimen, including the reflection pressure caused by the external explosion.

The reason why the pressure sensor part is disposed inside the pressure sensor holder part is that the pressure sensor part 160 may move if the pressure sensor part 160 receives the explosion load while the pressure sensor part 160 is disposed on the top of the structure specimen. . In other words, the pressure sensor holder is used for accurate measurement.

Hereinafter, a system 200 for measuring deformation of a structure according to an explosion load will be described. System 200 for measuring deformation of a structure includes, in one configuration, an apparatus 100 for measuring deformation of a structure described above. Furthermore, the apparatus 100 for measuring structure deformation has a configuration of reviewing whether accurate strain is measured. The configuration common to the apparatus 100 for measuring deformation of the structure described above will be briefly described.

10 is a block diagram showing a configuration of a system 200 for measuring deformation of a structure according to an explosion load according to the present invention.

The system 200 for measuring deformation of a structure according to an explosion load according to the present invention includes an explosion load calculation unit 210 for calculating an explosion load energy transferred to a structure specimen in an external explosion, and an explosion pressure received by the structure specimen. Calculated by the strain data calculator 220 and the strain data calculator 220 for calculating strain data for measuring the structure strain using a pressure gauge 226 for measuring the pressure and a sensor for measuring strain of the structure specimen Strain calculation unit 230 for receiving the strain data to calculate the strain of the structure specimen, absorption energy estimation unit 240 for estimating the absorbed energy in the structure specimen using the strain data calculated by the deformation data calculation unit 220 and Strain energy and strain lead subtracting the absorbed energy estimated by the absorbed energy estimator 240 from the explosive load energy calculated by the explosive load calculator 210 And a strain review unit 250 for comparing the strain of the specimen structure in the operation unit 230.

The explosion load calculation unit 210 is configured to calculate the explosion load received by the structure specimen due to the external explosion. As mentioned above, the explosion load can be calculated using the ConWEP program. The type of explosives, the weight of explosives, the explosives and the standoff can be input, and the explosive load generated using ConWEP can be measured. 11 is a graph showing a screen for calculating the explosion pressure load received by the structure specimen using the ConWEP program.

Deformation data calculation unit 220 is a configuration corresponding to the apparatus 100 for measuring the deformation of the structure according to the above-described explosion load. That is, the data calculated through the apparatus 100 for measuring the structure deformation is called deformation data.

The deformation data calculation unit 220 is disposed on the lower plate 221, the upper side of the lower plate, and has a side wall case 222 having a side wall forming a hollow, and is disposed on an upper side of the side wall to confine the structure specimen therein to seal the side wall case. When the structural restraint plate 223, the fragments of the structural specimens generated by the external explosion force, the fragment receiving plate 224 disposed inside the sidewall case to receive the fragments, the structural specimens to measure the strain of the structural specimens The structure strain measurement sensor group 225 is disposed and the pressure gauge holder 226 disposed inside the pressure sensor holder part embedded in the upper surface of the structure specimen, and measures the explosion pressure received by the structure specimen from the external explosion force.

The side wall case 222 is made of steel, the cross-sectional shape is preferably in the form of a column of any one of a circle, oval, polygon.

The structure restraining plate 223 is disposed on the upper side of the side wall case 222, and includes a receiving frame having a cross-sectional shape such as a structural specimen and one or more close means for closely contacting the structural specimen and the receiving frame. It is preferable that the accommodating frame extends outward from the side wall of the side wall case.

The structure restraining plate 223 may further include a protective plate made of a soft material disposed in contact between the receiving frame and the structure specimen, and in contact with the portion of the structure specimen to which the contact means applies the pressure.

Preferably, the contact means is one or more clamps that clamp the structure specimen and the receiving frame.

The fragment receiving plate 224 is preferably in the form of a plate disposed between the structure restraint plate and the lower plate to partition the inside of the side wall case to the upper and lower. Furthermore, the fragment receiving plate 224 is preferably made of soft synthetic resin or rubber.

When debris is accommodated in the debris receiving plate 224, the number of debris and the depth into which the debris penetrates will vary depending on the explosion load received by the structural specimen. Therefore, the aspect of the debris (destructive form) of the structural specimens can be analyzed and used for measuring energy or strain received by the structural specimens according to the explosion load.

The structure strain measurement sensor group 225 may include one or more strain measurement sensors disposed in contact with at least one side of the upper and lower surfaces of the structure specimen, one or more acceleration measurement sensors disposed in contact with the lower side of the structure specimen and the body may be disposed on the lower plate. And the displacement transfer portion for measuring the distance displacement of the structure specimen includes one or more LVDTs in contact with the underside of the structure specimen, wherein the displacement transfer portion of the LVDT when the displacement transfer portion of the LVDT passes the debris receiving plate. It is preferable to have a structure which penetrates a fragment receiving plate.

The deformation data calculation unit 220 is fixed on the lower plate, or fixed to the side wall of the side wall case, the displacement transmission unit for measuring the displacement of the receiving frame of the structure restraint plate 223 is in contact with the lower side of the receiving frame It further comprises one or more LVDT, wherein, if the displacement transfer portion of the LVDT passes the debris receiving plate, it is preferable that the displacement transfer portion of the LVDT has a structure that penetrates through the fragment receiving plate. This LVDT is for separately measuring the displacement of the structure supporting the structure specimen, such as the receiving frame or side wall case 222, as described above.

The pressure gauge is characterized by measuring the deformation of the structure according to the explosion load, characterized in that for measuring the explosion pressure received only by the structural specimen, including the reflection pressure caused by the external explosion.

Deformation data calculation unit 230 is a configuration for calculating the strain of the structure specimen by receiving the data transmitted from the deformation data.

An important part of the structure deformation measurement system according to the present invention is the strain review unit 250. The strain review unit 250 is a strain energy obtained by subtracting the absorbed energy estimated by the absorbed energy estimator 240 from the explosion load energy calculated by the explosion load calculator 230 and the strain of the structural specimen calculated by the strain calculator 230. Compare If the strain energy and strain of the structural specimens are the same or at least extremely similar, the strain calculation of the present invention is accurate. If a large number of errors are displayed, it is preferable to calculate the strain again in the strain calculation unit because incorrect data is calculated.

Absorption energy estimator 240 is a configuration for estimating the energy absorbed by the structure specimen, it is preferable to use the explosion pressure measured in the pressure gauge of the deformation data calculation unit. That is, the energy absorbed by the structural specimen can be estimated by using the reflection pressure measured by the pressure gauge and the displacement value of the structural specimen.

As shown in FIG. 12, when the X axis is set as the displacement value (elastic deflection value) of the structure specimen and the Y axis is set as the reflection pressure value measured by the pressure gauge, a graph having a constant area appears. This area is the energy value absorbed by the structural specimen.

The embodiments and drawings attached to this specification are merely to clearly show some of the technical ideas included in the present invention, and those skilled in the art can easily infer within the scope of the technical ideas included in the specification and drawings of the present invention. Modifications that can be made and specific embodiments will be apparent that all fall within the scope of the present invention.

100: device for measuring the deformation of the structure 110: lower plate
120: side wall portion 130: structure restraint
131: receiving frame 132: contact means
133: protective plate 134: cover metal plate
140: fragment receiving portion 150: deformation measuring unit
151: strain measurement sensor 152: acceleration measurement sensor
153: LVDT 154: displacement transfer unit of LVDT
155: LVDT 160 disposed in the receiving frame: pressure sensor
170: foundation
200: system for measuring the deformation of the structure 210: explosion load calculation unit
220: deformation data calculation unit 221: lower plate
222: side wall case 223: structure restraining plate
224: debris receiving plate 225: strain measurement sensor group
226: pressure gauge 230: strain calculation unit
240: absorption energy estimation unit 250: strain review unit

Claims (22)

Lower plate portion;
A side wall portion disposed on an upper portion of the lower plate portion and having a side wall forming a hollow;
A structure restraining part disposed on an upper end of the side wall part, the structure restraining part sealing the side wall part by constraining a structure specimen inside;
When fragments of the structural specimens are generated by an external explosive force, the fragment receiving portion disposed inside the side wall portion to receive the fragments;
A structure deformation measurement unit disposed on the structure specimen to measure deformation of the structure specimen; And
It is disposed inside the pressure sensor holder portion embedded in the upper surface of the structure specimen, measuring the deformation of the structure according to the explosion load, characterized in that it comprises a pressure sensor unit for measuring the explosion pressure received by the structure specimen from the external explosion force Device. The method of claim 1,
An apparatus for measuring the deformation of the structure according to the explosion load, characterized in that the flat plate made of a concrete material, the lower plate portion further comprises a base portion disposed on the top. The method of claim 1,
The side wall portion is made of steel, the cross-sectional shape is a device for measuring the deformation of the structure according to the explosion load, characterized in that the column shape of any one of circular, oval, polygon. The method of claim 1,
The structural constraints are disposed on the upper side of the side wall portion, the receiving frame having a cross-sectional shape, such as the structural specimen to the structural specimen placed thereon; And
At least one contact means for contacting the structure specimen and the receiving frame,
The receiving frame is a device for measuring the deformation of the structure according to the explosion load, characterized in that extending in the outward direction than the side wall of the side wall portion. The method of claim 4, wherein
The structure restraint part is disposed between the receiving frame and the structure specimen, and the contact means further comprises a protective plate of a flexible material disposed in contact with the portion of the structure specimen to apply a pressure of the structure according to the explosion load Device for measuring strain. The method according to claim 4 or 5,
The contact means is a device for measuring the deformation of the structure according to the explosion load, characterized in that one or more clamps for clamping the structure specimen and the receiving frame. The method of claim 1,
The debris receiving portion is disposed between the structure restraint portion and the lower plate portion is a device for measuring the deformation of the structure according to the explosion load, characterized in that the plate shape partitioning the inside of the side wall portion to the top and bottom. The method according to claim 1 or 7,
The debris receiving unit is a device for measuring the deformation of the structure according to the explosion load, characterized in that consisting of a soft synthetic resin or rubber. The method of claim 1,
The structure deformation measuring unit may include one or more strain measuring sensors disposed in contact with at least one side of an upper surface or a lower surface of the structure specimen;
At least one acceleration sensor disposed in contact with the lower surface of the structure specimen; And
The main body is fixed on the lower plate, and includes a displacement transfer unit for measuring the distance displacement of the structural specimen in contact with the lower surface of the structural specimen,
And the displacement transmitting part of the LVDT has a structure passing through the fragment receiving part when the displacement transmitting part of the LVDT passes the debris receiving part. 10. The method of claim 9,
The device for measuring the explosion load
The main body further includes at least one LVDT fixed to the bottom plate or fixed to the side wall of the side wall, the displacement transmission for measuring the displacement of the receiving frame of the structure restraint in contact with the lower side of the receiving frame,
And the displacement transmitting part of the LVDT has a structure passing through the fragment receiving part when the displacement transmitting part of the LVDT passes the debris receiving part. The method of claim 1,
The pressure sensor unit measures the deformation of the structure according to the explosion load, characterized in that for measuring the explosion pressure received only by the structure specimen including the reflection pressure caused by the external explosion. An explosion load calculation unit for calculating an explosion load transferred to a structure specimen from an external explosion;
Deformation data calculation unit for calculating the deformation data for measuring the structure deformation by using a pressure gauge for measuring the explosion pressure received by the structure specimen and a sensor for measuring the strain of the structure specimen;
A strain calculator for receiving strain data calculated by the strain data calculator to calculate strain of a structural specimen;
An absorption energy estimating unit estimating absorption energy of the structure specimen using the deformation data calculated by the deformation data calculating unit; And
And a strain examining unit comparing the strain energy obtained by subtracting the absorbed energy estimated by the absorbing energy estimating unit from the explosion load energy calculated by the explosion load calculating unit and the strain of the structural specimen calculated by the strain calculating unit. System for measuring the deformation of structures under load. The method of claim 12,
The deformation data calculation unit
Bottom plate;
A sidewall case disposed on an upper portion of the lower plate and having a sidewall forming a hollow;
A structure restraining plate disposed on an upper end of the side wall and confining the structure specimen to seal the side wall case;
A fragment receiving plate disposed inside the sidewall case to receive the fragment when fragments of the structural specimen are generated by an external explosion force;
A structure strain sensor group disposed on the structure specimen to measure the strain of the structure specimen; And
It is disposed in the pressure sensor holder portion embedded in the upper surface of the structure specimen, measuring the deformation of the structure according to the explosion load, characterized in that it comprises a pressure gauge for measuring the explosion pressure received by the structure specimen from the external explosion force system. The method of claim 13,
The side wall case is made of steel, the cross-sectional shape is a system for measuring the deformation of the structure according to the explosion load, characterized in that the column shape of any one of a circle, oval, polygon. The method of claim 13,
The structure restraint plate is disposed on an upper side of the side wall case, the receiving frame having a cross-sectional shape, such as the structure specimen is placed on top of the structure specimen; And
At least one contact means for contacting the structure specimen and the receiving frame,
The receiving frame is a system for measuring the deformation of the structure according to the explosion load, characterized in that extending in the outward direction than the side wall of the side wall case. The method of claim 13,
The structure restraint plate further comprises a protective plate of a flexible material disposed in contact between the receiving frame and the structure specimen, the contact means being placed in contact with a portion of the structure specimen under pressure. System to measure the deformation of the system. 17. The method according to claim 15 or 16,
The contact means is a system for measuring the deformation of the structure according to the explosion load, characterized in that at least one clamp for clamping the structure specimen and the receiving frame. The method of claim 13,
The debris receiving plate is a system disposed between the structure restraint plate and the lower plate is a system for measuring the deformation of the structure according to the explosion load, characterized in that the partition shape of the upper and lower parts of the side wall case. The method according to claim 13 or 18,
The debris receiving plate is a system for measuring the deformation of the structure according to the explosion load, characterized in that composed of a soft synthetic resin or rubber. The method of claim 13,
The structure strain measuring sensor group may include one or more strain measuring sensors disposed in contact with at least one side of an upper surface or a lower surface of the structure specimen;
At least one acceleration sensor disposed in contact with the lower surface of the structure specimen; And
The main body is fixed on the lower plate, and includes a displacement transfer unit for measuring the distance displacement of the structural specimen in contact with the lower surface of the structural specimen,
And the displacement transmitting portion of the LVDT has a structure passing through the fragment receiving plate when the displacement transmitting portion of the LVDT passes through the fragment receiving plate. The method of claim 13,
The deformation data calculation unit
The main body further includes at least one LVDT fixed on the bottom plate or fixed to the side wall of the side wall case, the displacement transmission for measuring the displacement of the receiving frame of the structure restraint in contact with the lower side of the receiving frame. ,
And the displacement transmitting portion of the LVDT has a structure passing through the fragment receiving plate when the displacement transmitting portion of the LVDT passes through the fragment receiving plate. The method of claim 13,
The pressure gauge measures the deformation of the structure according to the explosion load, characterized in that for measuring the explosion pressure received only by the specimen of the structure, including the reflection pressure caused by the external explosion. Measuring system.

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