JP6322085B2 - Load test equipment - Google Patents

Description

  The present invention relates to a load test apparatus for measuring a load load in a horizontal direction of a test object such as a laminated rubber bearing or a sliding bearing.

  Laminated rubber bearings and sliding bearings used for structures such as bridges and buildings have the function of moving horizontally while receiving vertical loads from the upper structure. The relationship is measured and its characteristics are confirmed.

  In a load test apparatus that measures a load load in the horizontal direction of a test object such as a laminated rubber bearing, there are mainly a linear motion guide system, a roller guide system, a hydraulic levitation system, and the like as a support form of a horizontal vibration table. In addition, as a method of measuring the horizontal resistance force, a load cell is used at the tip of the horizontal actuator, a multi-axis load cell is installed on the upper or lower side of the laminated rubber bearing, or the load cell is installed via a roller or a linear guide. There are methods to install.

  As the load test apparatus, for example, as shown in FIG. 9, a horizontal vibration table 73 on which a test object T such as a laminated rubber bearing is mounted is supported on a fixed base 79 by a plurality of rollers 75, and a horizontal actuator There is a load test apparatus in which a load cell 78 is provided at the tip of 74 and a vertical load is applied to a device under test T via a pressure plate 77 by a vertical actuator 76 fixed to the frame 72.

  Although not shown, the horizontal vibration table is supported by a roller or a linear guide, and a multi-axis load cell is provided between the horizontal vibration table and the test object or between the test object and the vertical actuator. The installed load test apparatus can generally measure the most accurate of various apparatuses.

  Further, as shown in FIG. 10, a horizontal vibration table 83 on which the device under test T is placed is supported on a fixed base 93 by a plurality of rollers 85 and contacts a pressure plate 87 positioned below a vertical actuator 86. There is also an apparatus in which a plurality of rollers 90 are interposed between the upper plate 89 and the lower plate 91 in contact with each other, and a load cell 88 is disposed between the hanging portion 87a of the pressure plate 87 and the end surface of the lower plate 91.

  However, the load test apparatus 71 shown in FIG. 9 accurately measures the horizontal resistance force acting on the DUT under the influence of the resistance force of the roller 75 proportional to the vertical load and the inertial force of the horizontal vibration table 73. Difficult to do. The same problem occurs when the horizontal vibration table 73 is supported by a linear guide.

  Furthermore, in a load testing device equipped with a multi-axis load cell, the shape of the load cell is determined by the combination of vertical load, horizontal load, and overturning moment, but horizontal characteristics such as laminated rubber bearings where the horizontal load is extremely small compared to the vertical load. It is not easy to make the shape of the load cell suitable for grasping, and the apparatus is very expensive.

  On the other hand, in the load test apparatus 81 shown in FIG. 10, there is a concern that the contact surface with the roller 90 of the lower plate 91 may be depressed due to long-term use or the like, which may affect the load detection. It is difficult to conduct a test.

  Therefore, the present invention has been made in view of the problems in the conventional load test apparatus described above, and reduces the apparatus cost and accurately measures the horizontal resistance force acting on the test object such as a laminated rubber bearing. It is an object of the present invention to provide a load testing apparatus that can easily handle a load test in two horizontal directions.

In order to achieve the above object, a load test apparatus according to the present invention includes a movable base on which a device under test is placed and movable in a horizontal direction with respect to a fixed base, and a horizontal direction in which a horizontal load is applied to the movable base. An actuator, a first pressurizing member that is positioned above the device under test and is in contact with the upper surface of the device under test, and a pressure vessel filled with laminated rubber or incompressible liquid . A holding structure placed on the member; a second pressure member positioned above the holding structure and in contact with an upper surface of the holding structure; and a vertical actuator for applying a vertical load to the second pressure member And a load cell that is interposed between the first pressure member and the second pressure member and measures a load load in a horizontal direction, and the holding structure is between an upper portion and a lower portion of the holding structure. Water increases as the horizontal relative displacement increases Characterized by adding a force to the first pressing member and said second pressing member.

  The load test apparatus according to the present invention includes a movable base on which a holding structure is mounted and movable in a horizontal direction with respect to the fixed base, a horizontal actuator that applies a horizontal load to the movable base, and the holding structure A first pressure member that is in contact with the upper surface of the holding structure; a device to be tested that is placed on the first pressure member; and a device to be tested that is located above the device to be tested. A second pressure member that contacts the upper surface of the body, a vertical actuator that applies a vertical load to the second pressure member, and the first pressure member and the second pressure member. A load cell for measuring a horizontal load, wherein the holding structure increases a horizontal force that increases as a horizontal relative displacement between an upper portion and a lower portion of the holding structure increases. It is added to the first pressure member.

According to the load test apparatus according to the present invention, the horizontal relative displacement between the upper part and the lower part increases between the DUT and the vertical actuator or between the DUT and the movable base. In order to provide a holding structure that adds a horizontal force that increases with the adjacent member to the adjacent member, only the horizontal force that increases as the horizontal displacement of the holding structure increases is added to the pressure member provided with the load cell, Even when a roller or linear guide is used to support the movable base, the load cell does not detect the frictional force between the movable base and the roller. Can be simplified. Further, regardless of the magnitude of the vertical load, because the horizontal displacement horizontal displacement of the retaining structure increases with increase is only applied to the load cell, when the horizontal displacement of the retaining structure is small errors in the horizontal force measured Becomes smaller. Therefore, the horizontal resistance can be measured with high accuracy while keeping the apparatus cost low with a simple configuration. Also, it can easily cope with load tests in two horizontal directions.

  In the load test apparatus, the horizontal rigidity of the holding structure is set to 0.5% or less of the horizontal rigidity of the load cell, thereby restricting the movement and deformation of the holding structure at the time of measurement. Measurement errors can be reduced and high-precision measurements can be made.

  Further, the holding structure can be a pressure vessel filled with laminated rubber or an incompressible liquid.

  Further, the load test apparatus includes a through bolt that vertically penetrates the holding structure and is fixed to a member adjacent to the holding structure, the first pressure member or the first pressure member positioned above the holding structure. (2) The stopper is fixed to the pressure member and surrounds the upper part of the holding structure, thereby providing a stopper for restricting the space between the upper part and the lower part of the holding structure. Can be prevented and rotational deformation can be restricted.

  As described above, according to the present invention, the apparatus cost is low, the horizontal resistance acting on the test object such as a laminated rubber bearing can be accurately measured, and the load test in two horizontal directions can be easily handled. It is also possible to provide a load test apparatus that can also be used.

It is a schematic block diagram which shows one Embodiment of the load test apparatus which concerns on this invention. It is a graph which shows the horizontal deformation amount and horizontal force of laminated rubber which were used for the load testing device concerning the present invention, and the horizontal displacement and horizontal force of the horizontal vibration table used for the conventional load testing device. It is a figure which shows an example of the laminated rubber used for the load test apparatus which concerns on this invention, Comprising: (a) is front sectional drawing, (b) is a schematic plan view which shows the positional relationship of laminated rubber and a load cell. It is a figure which shows the other example of the laminated rubber used for the load test apparatus which concerns on this invention, Comprising: (a) is front sectional drawing, (b) is a schematic plan view which shows the positional relationship of laminated rubber and a load cell. It is a figure which shows an example of the stopper of the laminated rubber used for the load test apparatus which concerns on this invention, Comprising: (a) is sectional drawing, (b) is the sectional view on the AA line of (a). It is a schematic block diagram which shows the other example of the holding structure of the load test apparatus which concerns on this invention. It is a schematic block diagram which shows the other example of the holding structure of the load test apparatus which concerns on this invention. It is a schematic block diagram which shows the other example of the holding structure of the load test apparatus which concerns on this invention. It is a schematic block diagram which shows an example of the conventional load test apparatus. It is a schematic block diagram which shows the other example of the conventional load test apparatus.

  Next, embodiments for carrying out the present invention will be described in detail with reference to the drawings. In the following description, a case where the load load in the horizontal direction of the laminated rubber bearing is measured by the load test apparatus according to the present invention will be described as an example.

  FIG. 1 shows a first embodiment of a load test apparatus according to the present invention. The load test apparatus 1 includes a fixed base 11 and a laminated rubber bearing (hereinafter referred to as “test object”) T to be tested. A movable base (horizontal vibration table) 3 mounted on the fixed base 11 and horizontally movable by a plurality of rollers 5, a horizontal actuator 4 that applies a horizontal load to the movable base 3, and a device under test T A first pressure plate (first pressure member) 7 that comes into contact with the upper surface, a laminated rubber (a part of the test apparatus) 10 as a holding structure placed on the first pressure plate 7, and an upper surface of the laminated rubber 10 A second pressure plate (second pressure member) 12 that abuts and is movable in the vertical direction by a plurality of rollers 13, and a vertical actuator 6 that is fixed to the frame 2 and applies a vertical load to the second pressure plate 12. And the hanging part 12 of the second pressure plate 12 , Interposed between the 12b and the end face of the first pressurizing plate 7 comprises a load cell 8, 9 for measuring the horizontal applied load and the like.

  The laminated rubber 10 has both a primary shape factor which is a ratio of a pressure-receiving area and a free area of one rubber layer, and a secondary shape factor obtained by dividing the outer shape of the laminated rubber by the total rubber thickness, and has a low rigidity. A rubber material having a small damping property is used. In order to suppress the rotational behavior of the laminated rubber 10 by setting the internal configuration so that the horizontal rigidity of the laminated rubber 10 is 0.5% or less of the rigidity of the load cells 8 and 9 (allowable measurement error rate of the load cells 8 and 9). The vertical sinking amount at the maximum vertical load is set to 1/200 or less of the outer shape of the laminated rubber 10.

  Using the load test apparatus 1 having the above-described configuration, a load is applied to the device under test T with the horizontal actuator 4 and the vertical actuator 6, and the load load in the horizontal direction of the device under test T is measured with the load cells 8 and 9. .

  Here, for example, in the conventional load test apparatus 71 shown in FIG. 9, the horizontal vibration table 73 on which the device under test T is placed is supported by a plurality of rollers 75, and a load cell 78 is provided at the tip of the horizontal actuator 74. The horizontal load load of the test object T is measured by providing the horizontal vibration table 73 as shown in FIG. 2B due to friction between the horizontal vibration table 73 and the fixed base 79. Regardless of the magnitude of the horizontal displacement, a horizontal force L proportional to the vertical load (increasing as the horizontal displacement increases) is generated, which leads to an error in measuring the horizontal force by the load cell 78.

  On the other hand, when the laminated rubber 10 is used as in the present invention, only a horizontal force proportional to the horizontal displacement of the laminated rubber 10 is applied to the first pressure plate 7 as shown in FIG. Since the load cells 8 and 9 do not detect the friction force between the movable base 3 and the fixed base 11, the configuration between the movable base 3 and the fixed base 11 can be simplified. That is, the horizontal force can be measured with high accuracy without adopting a configuration in which the friction between the movable base 3 and the fixed base 11 is low. Further, the horizontal displacement of the laminated rubber 10 is small because only the horizontal force proportional to the horizontal displacement of the laminated rubber 10 is applied to the load cells 8 and 9 regardless of the magnitude of the vertical load by the vertical actuator 6. In this case, the error in horizontal force measurement is reduced. Therefore, the horizontal resistance force can be measured with high accuracy with a simple configuration.

  Further, since the horizontal rigidity of the laminated rubber 10 is 0.5% or less of the rigidity of the load cells 8 and 9, the laminated rubber 10 hardly moves and deforms during measurement. Therefore, the error of horizontal force measurement due to the installation of the laminated rubber 10 is small, and high-precision measurement is possible. In particular, when a vertical load such as a low friction type sliding bearing is large and a horizontal resistance force is small, an error is smaller than other methods.

Further, based on the horizontal rigidity of the laminated rubber 10 and the rigidity of the load cells 8 and 9, the horizontal force detected by the load cells 8 and 9 is corrected by the following calculation formula to calculate the actual horizontal force of the test object T. be able to.
Bearing horizontal force = Detected horizontal force x (1 + Horizontal rigidity of laminated rubber / Rigidity of load cell)

  In the above embodiment, the laminated rubber 10 is disposed between the first pressure plate 7 and the second pressure plate 12, and the device under test T is disposed between the movable base 3 and the first pressure plate 7. However, this positional relationship is reversed, and the laminated rubber 10 is disposed between the movable base 3 and the first pressure plate 7, and the device under test T is disposed between the first pressure plate 7 and the second pressure plate 12. It is also possible to arrange them, and in this case, the same effects as described above are obtained.

  FIG. 3 shows an example of the configuration of the laminated rubber 10 and the vicinity thereof, and exemplifies a case where a horizontal force in one direction is measured.

  The laminated rubber 10 is placed on the upper surface of the first pressure plate 24 that is in contact with the upper surface of a device under test (not shown), and the second pressure plate 21 is in contact with the upper surface of the laminated rubber 10. Above the second pressure plate 21, a vertical actuator (not shown) that applies a load in the vertical direction to the second pressure plate 21 is disposed. Between the hanging parts 21a and 21b of the second pressure plate 21 and the rising parts 24a and 24b of the first pressure plate 24, load cells 22 and 23 for measuring a load load in the horizontal direction are arranged. Each of the load cells 22 and 23 is arranged in five, each rated capacity is 2 MN, and the total rated capacity is 20 MN.

  Through-holes are formed in the laminated rubber 10 in the vertical direction, and bolts 25 are inserted through the respective through-holes. Thereby, while being able to prevent the lamination | stacking rubber | gum 10 and the adjacent member, rotation deformation | transformation can be restrained. Particularly, it is suitable when the thickness of the laminated rubber 10 is increased in order to reduce the measurement error of the horizontal force.

  FIG. 4 shows an embodiment of the configuration of the laminated rubber 10 and the vicinity thereof when measuring the horizontal force in two directions.

  The laminated rubber 10 is placed on the upper surface of the first pressure plate 28 that is in contact with the upper surface of a device under test (not shown), and the second pressure plate 26 is in contact with the upper surface of the laminated rubber 10. Above the second pressure plate 26, a vertical actuator (not shown) that applies a load in the vertical direction to the second pressure plate 26 is disposed. A load cell 27 for measuring a load load in the horizontal direction is disposed between each of the four hanging portions 26 a of the second pressure plate 26 and the four rising portions 28 a of the first pressure plate 28. Each load cell 27 has a rated capacity of 2MN, and can be measured in two directions with a rated capacity of 4MN. The through bolts 25 are disposed in the laminated rubber 10 and correspond to the separation and rotation between the laminated rubber 10 and the adjacent members, as in the case of the one-way measurement.

  In addition to the through bolts 25, as shown in FIG. 5, a stopper 29 is provided on the upper surface of the first pressure plate 7, and the protruding portion 29 b that protrudes inward in the horizontal direction from the standing portion 29 a of the stopper 29 The movement of the upper flange portion 10a in the horizontal direction is restricted, and the upward movement of the protruding portion 10b protruding in the horizontal direction from the upper flange portion 10a is restricted, whereby the laminated rubber 10 and the first pressure plate 7 or the upper flange portion 10a. Can be prevented and rotational deformation can be constrained. Moreover, when installing the load cells 22 and 23, if necessary, a bearing for allowing the laminated rubber 10 to sink or rotate in the vertical direction may be provided.

  As described above, according to the load test apparatus 1 according to the present invention, it is possible to easily change the rated capacity of the load cell for each device under test T, that is, to replace the load cell and change the number of installations. Using a uniaxial load cell, load detection in two horizontal directions can be easily performed.

  Further, the load test apparatus 1 can be installed not only in a load test in a test building or a factory but also in a bridge or a seismic isolation apparatus of a base isolation building for monitoring.

  Next, the calculation result of the measurement error of the horizontal load at the time of vertical load loading in this invention and the conventional load test apparatus is demonstrated.

  Table 1 shows the vertical load loaded on the test object T when using the load test apparatus 71 shown in FIG. 9, the horizontal force (true value) of the test object T, and the detected horizontal load (measurement error). Table 2 shows the relationship between the vertical load, the horizontal force under test, and the measurement error. Although the horizontal vibration table 73 is supported by the roller 75 in FIG. 9, this calculation shows a case where the horizontal vibration table 73 is supported by the linear motion guide method and the friction coefficient μ of the table guide is 0.0025. ing. As shown in Table 2, the measurement error increases as the vertical load increases, and the error is particularly large when the vertical load is large and the detected horizontal load is small. The black portion in the table is an error portion with an allowable measurement error rate of 0.5% or more of the load cell 78.

  Tables 3 and 4 show the vertical load loaded on the test object T of the load test apparatus using the multi-axis load cell, the horizontal force (true value) of the test object T, and the detected horizontal load (including measurement errors). Value) and the relationship between the vertical load, the horizontal force under test, and the measurement error. In this case, since the load detection value in each direction is corrected by the multi-axis load cell, no measurement error occurs.

  Table 5 shows the vertical load loaded on the test object T when the load test apparatus 81 shown in FIG. 10 is used, the horizontal force (true value) of the test object T, and the detected horizontal load (measurement error). Table 6 shows the relationship among the vertical load, the horizontal force under test, and the measurement error. This calculation shows a case where the friction coefficient μ of the roller 90 is 0.0001. The black portion in the table is a portion where the allowable measurement error rate of the load cell 88 is 0.5% or more, and as shown in FIG. Although the error is significantly smaller than that of the linear motion guide system, the error is still large when the vertical load is large and the detected horizontal load is small.

  Table 7 shows the vertical load loaded on the test object T when the load test apparatus 1 according to the present invention shown in FIG. 1 is used, the horizontal force (true value) of the test object T, and the detected horizontal load. Table 8 shows the relationship between the vertical load, the test object horizontal force, and the measurement error. In this calculation, the horizontal rigidity of the laminated rubber 10 is 10.047 kN / mm, the dimensions of the laminated rubber 10 are 1600 mm × 1600 mm in plan view, 33 layers with a thickness of 3 mm, and the rigidity of the load cell is determined according to the horizontal resistance force of the DUT T. This shows the case of adjustment. As shown in Table 8, the measurement error is constant regardless of the increase in the vertical load, and the error is significantly smaller than the linear motion guide method in Table 2 and the roller guide method in Table 6. In Table 8, the error is relatively large when the detected horizontal load is small. This is because when the detected horizontal load is small, that is, when the horizontal resistance force of the test object is small, the laminated rubber 10 accompanying the deformation of the load cell. It is because it is strongly influenced by the horizontal force of the.

  In the above embodiment, the case where the load load in the horizontal direction of the laminated rubber bearing is measured by the load test apparatus according to the present invention is illustrated. However, in addition to the laminated rubber bearing, the load in the vertical direction and the horizontal direction are also measured. It is possible to target a device under test that can simultaneously receive and follow a horizontal displacement.

  Next, another example of the load test apparatus holding structure according to the present invention will be described with reference to FIG.

  The holding structure 31 is disposed between the first pressure plate 7 and the second pressure plate 12 instead of the laminated rubber 10 shown in FIG. 1, and is disposed between the pressure vessel 32 and the piston 33. The hydraulic oil 34 as an incompressible liquid is filled, and the small diameter portion 33 a of the piston 33 and the inner surface of the pressure vessel 32 are sealed with a seal ring 35. The internal structure is set so that the horizontal rigidity of the holding structure 31 is 0.5% or less of the rigidity of the load cells 8 and 9 shown in FIG. Although not shown, a flow path for guiding the hydraulic oil 34 from the outside to the pressure vessel 32 is formed in the pressure vessel 32, and the pressure vessel 32 is provided with a pump, a pressure gauge, and the like for sending the hydraulic oil 34. .

  Stopper bolts 36 and 37 are provided between the pressure vessel 32 and the piston 33. The stopper bolts 36 and 37 restrict the horizontal and upward movement of the piston 33 with respect to the pressure vessel 32. In addition to the stopper bolts 36 and 37, a stopper that restricts the horizontal and upward movement of the piston 33 by surrounding the large-diameter portion 33b of the piston 33 may be provided as in the stopper 29 shown in FIG. it can.

When the holding structure 31 is used, the first pressure plate is absorbed in the same manner as when the laminated rubber 10 is used by absorbing a small horizontal relative displacement between the pressure vessel 32 and the piston 33 by elastic deformation of the seal ring 35. 7, only the horizontal force that increases as the horizontal displacement of the holding structure 31 increases is applied, and the load cells 8 and 9 do not detect the frictional force between the movable base 3 and the fixed base 11. Further, regardless of the magnitude of the vertical load by the vertical actuator 6, since the horizontal force horizontal displacement increases with increase of the holding structure 31 is only applied to the load cell 8,9, the horizontal displacement of the holding structure 31 When is small, the error in horizontal force measurement is small, and the horizontal resistance force can be measured with high accuracy with a simple configuration.

  In addition, since the horizontal rigidity of the holding structure 31 is 0.5% or less of the rigidity of the load cells 8 and 9, the holding structure 31 hardly moves and deforms during measurement, and the horizontal rigidity due to the installation of the holding structure 31. The error in force measurement is small and high-precision measurement is possible.

  Next, another example of the load test apparatus holding structure according to the present invention will be described with reference to FIG.

  This holding structure 41 is also arranged between the first pressure plate 7 and the second pressure plate 12 in place of the laminated rubber 10 shown in FIG. 1, and has an incompressible liquid inside the pressure vessel 42. The hydraulic oil 44 is filled. The upper part 42a and the lower part 42b of the pressure vessel 42 are integrated through a narrow part 42c. The internal structure is set so that the horizontal rigidity of the holding structure 41 is 0.5% or less of the rigidity of the load cells 8 and 9 shown in FIG. Although not shown, a flow path for guiding the hydraulic oil 44 from the outside to the pressure vessel 42 is formed in the pressure vessel 42, and a pump and a pressure gauge for sending the hydraulic oil 44 to the pressure vessel 42 through the flow path Etc. are provided.

  Stopper bolts 46 and 47 are provided between the upper part 42 a and the lower part 42 b of the pressure vessel 42. The stopper bolts 46 and 47 restrict the horizontal and upward movement of the upper part 42a with respect to the lower part 42b of the pressure vessel 42. In addition to the stopper bolts 46 and 47, a stopper that surrounds the upper portion 42a of the pressure vessel 42 and restricts the horizontal and upward movement of the upper portion 42a can be provided as in the stopper 29 shown in FIG. .

When the holding structure 41 is used, the minute horizontal relative displacement between the upper part 42a and the lower part 42b of the pressure vessel 42 is absorbed by the bending deformation of the narrow part 42c, so that it is the same as when the laminated rubber 10 is used. Further, as shown in FIG. 2A, only the horizontal force that increases as the horizontal displacement of the holding structure 41 increases is applied to the first pressure plate 7, and the load cells 8 and 9 are connected to the movable base 3. The frictional force between the fixed base 11 is not detected. Further, regardless of the magnitude of the vertical load by the vertical actuator 6, since the horizontal force horizontal displacement of the retaining structure 41 increases with increases only applied to the load cell 8,9, the horizontal displacement of the holding structure 41 When is small, the error in horizontal force measurement is small, and the horizontal resistance force can be measured with high accuracy with a simple configuration.

  In addition, since the horizontal rigidity of the holding structure 41 is 0.5% or less of the rigidity of the load cells 8 and 9, the holding structure 41 hardly moves or deforms during measurement, and the horizontal rigidity due to the installation of the holding structure 41. The error in force measurement is small and high-precision measurement is possible.

  Next, another example of the load test apparatus holding structure according to the present invention will be described with reference to FIG.

  This holding structure 51 is also disposed between the first pressure plate 7 and the second pressure plate 12 in place of the laminated rubber 10 shown in FIG. 1, and includes a lower portion 52 and an upper portion 53 that constitute a pressure vessel. In between, hydraulic oil 54 as an incompressible liquid is filled. Between the lower part 52 and the upper part 53, the 1st O-ring 55, the backup ring 56, the 2nd O-ring 57, and the 3rd O-ring 58 are provided as a sealing means. The internal structure is set so that the horizontal rigidity of the holding structure 51 is 0.5% or less of the rigidity of the load cells 8 and 9 shown in FIG. Although not shown, a flow path for guiding the hydraulic oil 54 from the outside between the lower part 52 and the upper part 53 is formed in the lower part 52, and a pump, a pressure gauge, etc. for sending the hydraulic oil 54 to the flow path are provided. Is connected.

  Stopper bolts 59 and 60 are provided between the lower part 52 and the upper part 53. The stopper bolts 59 and 60 restrict the horizontal and upward movement of the upper portion 53 relative to the lower portion 52. In addition to the stopper bolts 59 and 60, a stopper that surrounds the upper portion 53 and restricts the horizontal and upward movement of the upper portion 53 can be provided, as in the stopper 29 shown in FIG.

When the holding structure 51 is used, the laminated rubber 10 can be used by absorbing the minute horizontal relative displacement between the upper portion 53 and the lower portion 52 by the deformation of the first to third O-rings 55, 57, 58. As shown in FIG. 2A, since the horizontal force that increases as the horizontal displacement of the holding structure 51 increases is applied to the first pressure plate 7 as shown in FIG. And the frictional force between the fixed base 11 is not detected. Further, regardless of the magnitude of the vertical load by the vertical actuator 6, since the horizontal force horizontal displacement increases with increase of the holding structure 51 is only applied to the load cell 8,9, the horizontal displacement of the holding structure 51 When is small, the error in horizontal force measurement is small, and the horizontal resistance force can be measured with high accuracy with a simple configuration.

  In addition, since the horizontal rigidity of the holding structure 51 is 0.5% or less of the rigidity of the load cells 8 and 9, the holding structure 51 hardly moves and deforms during measurement, and the horizontal structure due to the installation of the holding structure 51. The error in force measurement is small and high-precision measurement is possible.

  In the above embodiment, the holding structures 31, 41, 51 are disposed between the first pressure plate 7 and the second pressure plate 12 in FIG. 1, and the object T to be tested is the movable base 3 and the first pressure plate. However, the positional relationship is reversed, the holding structures 31, 41, 51 are arranged between the movable base 3 and the first pressure plate 7, and the device under test T is It is also possible to arrange between the first pressurizing plate 7 and the second pressurizing plate 12, and in this case also, the same effects as described above are obtained.

  In addition to the laminated rubber 10 and the holding structures 31, 41, 51, the horizontal force proportional to the magnitude of the horizontal relative displacement between the upper part and the lower part, or the horizontal relative displacement increases. Various structures can be adopted as long as the horizontal force that increases with the pressure can be applied to the adjacent first pressure member 7 and second pressure member 12.

DESCRIPTION OF SYMBOLS 1 Load test apparatus 2 Frame 3 Movable base 4 Horizontal direction actuator 5 Roller 6 Vertical direction actuator 7 1st pressurization board 8, 9 Load cell 10 Laminated rubber 10a Upper flange part 10b Protrusion part 11 Fixed base 12 2nd pressurization board 12a, 12b Hanging Part 13 Roller 21 Second pressure plate 21a, 21b Hanging portion 22, 23 Load cell 24 First pressure plate 24a, 24b Upright portion 25 Through bolt 26 Second pressure plate 26a Hanging portion 27 Load cell 28 First pressure plate 28a Standing portion 29 Stopper 29a Standing part 29b Protruding part 31 Holding structure 32 Pressure vessel 33 Piston 33a Small diameter part 33b Large diameter part 33c, 33d Countersink part 34 Hydraulic oil 35 Seal ring 36, 37 Stopper bolt 41 Holding structure 42 Pressure container 42a Upper part 42b Lower part 42c Narrow part 42d, 42e Countersink part 4 Hydraulic fluid 46, 47 stopper bolt 51 holding structure 52 bottom 53 top 53a, 53b spot facing portion 54 hydraulic fluid 55 first 1O ring 56 back-up ring 57 first 2O ring 58 first 3O ring 59,60 stopper bolt T test object

Claims (9)

A movable base on which a device under test is placed and movable in a horizontal direction with respect to the fixed base;
A horizontal actuator for applying a horizontal load to the movable base;
A first pressure member located above the device under test and in contact with the upper surface of the device under test;
A holding structure made of laminated rubber and placed on the first pressure member;
A second pressure member positioned above the holding structure and abutting against the upper surface of the holding structure;
A vertical actuator for applying a vertical load to the second pressure member;
A load cell interposed between the first pressurizing member and the second pressurizing member and measuring a load in a horizontal direction,
The holding structure applies a horizontal force that increases as the relative displacement in the horizontal direction between the upper portion and the lower portion of the holding structure increases to the first pressure member and the second pressure member. A characteristic load testing device. A movable base on which a device under test is placed and movable in a horizontal direction with respect to the fixed base;
A horizontal actuator for applying a horizontal load to the movable base;
A first pressure member located above the device under test and in contact with the upper surface of the device under test;
A holding structure comprising a pressure vessel filled with an incompressible liquid and placed on the first pressure member;
A second pressure member positioned above the holding structure and abutting against the upper surface of the holding structure;
A vertical actuator for applying a vertical load to the second pressure member;
A load cell interposed between the first pressurizing member and the second pressurizing member and measuring a load in a horizontal direction,
The holding structure applies a horizontal force that increases as the relative displacement in the horizontal direction between the upper portion and the lower portion of the holding structure increases to the first pressure member and the second pressure member. A characteristic load testing device.   3. The load test apparatus according to claim 1, wherein a horizontal rigidity of the holding structure is 0.5% or less of a horizontal rigidity of the load cell. A movable base on which a holding structure is mounted and movable in a horizontal direction with respect to the fixed base;
A horizontal actuator for applying a horizontal load to the movable base;
A first pressure member located above the holding structure and abutting against the upper surface of the holding structure;
A device under test placed on the first pressure member;
A second pressure member located above the device under test and in contact with the upper surface of the device under test;
A vertical actuator for applying a vertical load to the second pressure member;
A load cell interposed between the first pressurizing member and the second pressurizing member and measuring a load in a horizontal direction,
The holding structure applies a horizontal force that increases as the relative displacement in the horizontal direction between the upper part and the lower part of the holding structure increases to the movable base and the first pressure member. Load test equipment. The load test apparatus according to claim 4, wherein a horizontal rigidity of the holding structure is 0.5% or less of a horizontal rigidity of the load cell. Load test apparatus according to claim 4 or 5, wherein the retaining structure is a laminated rubber. 6. The load test apparatus according to claim 4 or 5 , wherein the holding structure is a pressure vessel filled with an incompressible liquid. Load test apparatus according to any one of claims 1 to 7 wherein the holding structure penetrating in a vertical direction, characterized in that it comprises a through bolt which is fixed to the member adjacent to the holding structure. The space between the upper part and the lower part of the holding structure is increased by being fixed to the first pressure member or the second pressure member located above the holding structure and surrounding the upper part of the holding structure. load test apparatus according to any one of claims 1 to 7, characterized in that it comprises a stopper for regulating.