JP5744302B1 - Vibration measurement method for structures - Google Patents

Abstract

A vibration measurement method for a structure capable of easily measuring torsional vibration of the structure caused by an earthquake or the like. A plurality of displacement meters 1A and 1B for measuring a horizontal displacement amount of a structure 11 are installed on a floor surface (horizontal installation surface) 12 of the structure 11 at intervals, and a plurality of displacement meters 1A are disposed. , 1B, the torsional vibration of the structure 11 is calculated from the amount of displacement of the structure 11 measured in the horizontal direction and the interval (installation interval L) where the displacement meters 1A, 1B are installed. [Selection] Figure 1

Description

  The present invention relates to a vibration measurement method for a structure.

2. Description of the Related Art Conventionally, displacement meters that measure the amount of displacement (vibration) of structures caused by earthquakes and the like are known. As such a displacement meter, an accelerometer, a ruler, etc. are known.
Further, as a displacement meter, Patent Document 1 discloses a support unit fixed to a structure, a support member that can be displaced relative to the support unit in a horizontal direction, and a sensor that measures a relative displacement amount between the support unit and the support member. And calculating the absolute displacement of the structure from the measured relative displacement between the support and the support (for example, see Patent Document 1).

JP 2010-019748 A

  By the way, a torsional vibration or a rocking vibration of a structure caused by an earthquake or the like is also desired.

  Therefore, an object of the present invention is to provide a vibration measurement method for a structure that can easily measure torsional vibration and rocking vibration of a structure caused by an earthquake or the like.

To achieve the above object, the vibration measuring method of a structure according to the present invention, the horizontal direction of the two axial horizontal in the same plane in the same floor of the structure a displacement meter displacement amount measuring respective structures A plurality of displacement meters are installed at intervals, and a horizontal biaxial displacement amount of the structure measured at each of the plurality of displacement meters, and a horizontal direction between the plurality of displacement meters. and calculating the torsional vibration in the direction around the axis extending in the height direction of the structure from a distance.

  In the present invention, since a plurality of displacement meters installed at intervals in the horizontal direction can respectively measure the amount of displacement in the horizontal direction of the structure, the amount of displacement measured by the displacement meter and the position where the displacement meter is installed Thus, the torsional vibration of the structure can be easily measured.

In the vibration measurement method for a structure according to the present invention, the plurality of displacement meters are configured to be able to measure the amount of displacement in the vertical direction of the structure, respectively, and the plurality of displacement meters are respectively installed. and vertical displacement of the structure were measured at the location, it is preferable to calculate the rocking vibration of the structure from a horizontal spacing displacement gauge each other of the plurality of.
With this configuration, a plurality of displacement meters installed at intervals in the horizontal direction can measure the amount of displacement in the vertical direction of the structure, respectively. The rocking vibration of the structure can be easily measured based on the position where the

In the present invention, a plurality of displacement meters for measuring the amount of displacement of the structure in the vertical direction are installed on the same floor of the structure at intervals in the horizontal direction within the same plane, and the plurality of displacement meters are respectively installed. and vertical displacement of the structure were measured at the location was, and calculates the rocking vibration of the structure from the horizontal spacing displacement gauge each other the plurality of.

In the present invention, since a plurality of displacement meters installed at intervals in the horizontal direction can respectively measure the amount of displacement in the vertical direction of the structure, the amount of displacement measured by the displacement meter and the position where the displacement meter is installed Thus, the rocking vibration of the structure can be easily measured.
In the present invention, it is preferable that the plurality of displacement meters are respectively arranged in positions near the edge of the structure and symmetrical with respect to the rigid center of the structure in plan view.

According to the present invention, since a plurality of displacement meters installed at intervals in the horizontal direction can respectively measure the amount of horizontal displacement of the structure, the amount of displacement measured by the displacement meter and the displacement meter are installed. The torsional vibration of the structure can be easily measured based on the determined position.
Further, according to the present invention, since a plurality of displacement meters installed at intervals in the horizontal direction can respectively measure the amount of displacement in the vertical direction of the structure, the displacement amount measured by the displacement meter and the displacement meter are The rocking vibration of the structure can be easily measured based on the installed position.

(A) is a top view which shows arrangement | positioning with respect to the structure of the displacement meter used for the vibration measuring method of the structure by 1st Embodiment of this invention, (b) is the sectional view on the AA line of (a). It is a front view which shows an example of the displacement meter used for the vibration measuring method of the structure by 1st Embodiment. (A) is a bottom view of FIG. 2, (b) is the BB sectional drawing of FIG. It is a flowchart explaining a displacement amount calculation method. It is a figure explaining the torsional vibration of the structure in 1st Embodiment. (A) is a graph showing the time history of the displacement amount in the Y direction measured by the displacement meter 1A, and (b) is a graph showing the time history of the displacement amount in the Y direction measured by the displacement meter 1B. It is a graph which shows the time history of the torsional vibration of a structure. It is a figure explaining the rocking vibration of the structure in a 1st embodiment. (A) is a graph showing the time history of the displacement amount in the vertical direction of the displacement meter 1A, and (b) is a graph showing the time history of the displacement amount in the vertical direction of the displacement meter 1B. It is a top view which shows the arrangement | positioning with respect to the structure of the displacement meter used for the vibration measuring method of the structure by 2nd Embodiment of this invention. It is a figure explaining the torsional vibration of the structure in 2nd Embodiment. It is a figure explaining the mode of installation of the displacement meter for measuring rocking vibration by the modification of the embodiment of the present invention. It is a figure explaining the mode of installation of the displacement meter for measuring rocking vibration by other modifications of an embodiment of the present invention.

(First embodiment)
Hereinafter, a vibration measurement method for a structure according to a first embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 1, in the vibration measurement method for a structure according to the first embodiment, two displacement meters 1A and 1B are installed at an interval on the structure 11, and the two displacement meters 1A and 1B respectively measure. The torsional vibration and the rocking vibration of the structure 11 are calculated from the displacement amount of the structure 11. Note that the calculation unit (not shown) calculates the torsional vibration and the rocking vibration of the structure 11.

The structure 11 is a seismic isolation structure, and a known isolator 14 such as a laminated rubber bearing or a rolling bearing is provided on the seismic isolation layer 11a near the ground surface. Although not shown, the seismic isolation layer 11a is appropriately provided with a device such as a damper. The structure 11 is formed in a substantially rectangular shape in plan view. Here, it is assumed that substantially rectangular sides in plan view of the structure 11 extend in the X direction and the Y direction. In the present embodiment, the structure 11 is rigidly displaced except for the seismic isolation layer 11a.
The two displacement meters 1A and 1B are arranged on the floor surface 12 of the seismic isolation layer 11a of the structure 11 so as to be spaced apart in the X direction and have substantially the same position in the Y direction. The two displacement meters 1A and 1B are disposed in the vicinity of both ends in the X direction of the structure 11 and in the substantially central part in the Y direction of the structure. The installation interval between the displacement meter 1A and the displacement meter 1B is L.
The two displacement meters 1A and 1B have the same configuration.

  As shown in FIGS. 2 and 3, the displacement meters 1 </ b> A and 1 </ b> B include a support 2 that can move along the floor surface 12 of the structure 11, and a direction along the floor 12 that is installed on the support 2 ( Three first displacement measuring units 4, 4, and 4 that can measure displacement amounts in the horizontal direction, the X direction, and the Y direction, respectively, and the displacement amount in the vertical direction (Z direction) installed on the support 2. Three possible second displacement measuring units 8, 8, 8 and three first displacement measuring units 4, 4, 4 and a switch unit 5 for driving the three second displacement measuring units 8, 8, 8; A processing unit (not shown) for processing data of the displacement amounts measured by the three first displacement measuring units 4, 4, and 4 and the displacement amounts measured by the three second displacement measuring units 8, 8, and 8, respectively; Electric power that can supply power to the three first displacement measuring units 4, 4, 4 and the three second displacement measuring units 8, 8, 8 Includes a (not shown), a.

  The support body 2 is parallel to the first plate portion 21 with a space between the first plate portion 21 formed in a substantially equilateral triangle shape in plan view and the upper surface of the first plate portion 21. A second plate portion that is arranged and has the same outer shape as the first plate portion, and a connecting portion 23 that connects the first plate portion 21 and the second plate portion 22 so as to be relatively movable in the vertical direction are connected. The first plate portion 21 and the second plate portion 22 are provided with three moving portions 24, 24, and 24 that movably support the floor surface 12.

  The first plate portion 21 is formed with a hole portion 21a having a substantially circular shape in a plan view that penetrates in a vertical direction in a central portion in a plan view. Further, three first displacement measuring units 4, 4, 4 and three moving units 24, 24, 24 are arranged at the lower part of the first plate unit 21, and the lower surface of the first plate unit 21 and the floor surface 12 are arranged. An interval is provided between the two.

The moving part 24 has a cylindrical part 24a whose axial direction is the vertical direction and whose upper end is fixed to the lower surface of the first plate part 21, and is in contact with the floor 12 in a state of being inserted into the cylindrical part 24a. 12, a moving sphere 24 b that can roll along the line 12. The cylindrical portion 24a is disposed so that the lower end portion does not contact the floor surface 12.
Further, in the present embodiment, the three moving parts 24, 24, 24 are arranged at equal intervals in the circumferential direction around the center 21 c of the first plate part 21 with respect to the first plate part 21. The three moving parts 24, 24, 24 are arranged in the vicinity of the three corners 21 b, 21 b, 21 b of the substantially equilateral triangle in the plan view of the first plate part 21, respectively. It is arranged on a line connecting the center 21 c of the one plate portion 21.

In the second plate part 22, three corners 22b, 22b, 22b of a substantially equilateral triangle in plan view overlap with three corners 21b, 21b, 21b of a substantially equilateral triangle in plan view of the first plate part 21, respectively. Are arranged as follows.
The second plate portion 22 has three holes 22a, 22a, and 22a that are substantially circular in plan view and that penetrate in the vertical direction at positions spaced equidistantly from the center 22c in plan view. These hole portions 22a, 22a, and 22a are respectively formed on lines connecting the center 22c and the corner portion 22b of the second plate portion 22 in plan view.

The connecting portion 23 includes cylindrical cylindrical portions 26, 26, 26 fixed to the upper surface of the first plate portion 21, and coil springs 27, 27, 27 into which the cylindrical portions 26, 26, 26 are respectively inserted. doing.
The cylindrical portions 26, 26, and 26 are arranged at positions corresponding to the three moving portions 24, 24, and 24, respectively, with the axial direction being the vertical direction. The cylindrical portions 26, 26, and 26 are inserted into the holes 22 a, 22 a, and 22 a of the second plate portion 22 at the upper end side.
The coil springs 27, 27, 27 each have a first plate portion when the axial direction is the vertical direction, and the upper end side of the cylindrical portions 26, 26, 26 is inserted into the holes 22 a, 22 a, 22 a of the second plate portion 22. The upper end portion is in contact with the lower surface of the second plate portion 22, and the lower end portion is in contact with the upper surface of the first plate portion 21.

  The inner diameter of the hole 22a of the second plate portion 22 is formed larger than the outer shape of the cylindrical portion 26, and the second plate portion 22 and the cylindrical portion 26 are configured to be relatively movable in the vertical direction. In the present embodiment, when the cylindrical portion 26 is inserted into the hole portion 22 a of the second plate portion 22, about 0 is provided between the inner peripheral surface of the hole portion 22 a of the second plate portion 22 and the outer peripheral surface of the cylindrical portion 26. A gap of 1 mm is formed. Even when the second plate portion 22 and the cylindrical portion 26 behave differently in the vertical direction due to slight vibration, if the second plate portion 22 and the cylindrical portion 26 are relatively movable in the vertical direction, the second plate The part 22 and the cylindrical part 26 may be in contact with each other.

Such a second plate portion 22 is configured so that a horizontal force from the first plate portion 21 is transmitted, and configured so that a vertical force from the first plate portion 21 is not transmitted. Has been.
The coil spring 27 preferably has a predetermined rigidity so as not to be easily deformed in the horizontal direction.

In addition, the second plate portion 22 is connected to the lower end portion of the support member 13 that extends in the vertical direction and is supported at the upper end portion, for example, by the ceiling portion or the beam portion of the structure 11. In the present embodiment, the center portion of the upper surface of the second plate portion 22 is connected to the lower end portion of the support member 13.
The support member 13 includes an upper support member 131 supported by a ceiling portion and a beam portion of the structure 11, a lower support member 132 fixed to the second plate portion 22, an upper support member 131, and a lower support member 132. And a connecting plate 133 for connecting the two.
The lower support member 132 and the second plate portion 22 are fixed with, for example, screws or an adhesive.

Screws for locking the connection plate 133 to the upper support member 131 can be inserted into the connection plate 133, and a plurality of upper long holes 133 a and screws for locking the connection plate 133 to the lower support member 132 are provided. A plurality of lower elongated holes 133b that can be inserted are formed. These upper long hole 133a and lower long hole 133b are formed so as to extend in the vertical direction. Accordingly, the vertical position of the lower support member 132 with respect to the upper support member 131 can be adjusted, and the vertical position of the second plate portion 22 with respect to the structure 11 can be adjusted.
In addition, without providing the connecting plate 133 as described above, one of the upper support member 131 and the lower support member 132 is formed with a screw portion extending in the vertical direction, and the other has a screw hole into which the screw portion can be screwed. The position of the lower side support member 132 with respect to the upper side support member 131 may be adjusted by adjusting the amount by which the screw portion and the screw hole are screwed together.

The three first displacement measuring units 4, 4, 4 have a relative displacement amount (hereinafter referred to as a horizontal displacement amount) between the support 2 and the floor surface 12 in a plane (substantially in a horizontal plane) along the floor surface 12. It is composed of a displacement sensor that can measure For example, the three first displacement measuring units 4, 4 and 4 include an optical displacement sensor using a bar code reader, an optical mouse, a displacement sensor using an anotopen, a differential transformer type displacement sensor, etc. It consists of
Further, in the present embodiment, the three first displacement measuring units 4, 4, 4 are arranged at equal intervals in the circumferential direction around the center 21 c of the first plate portion 21 with respect to the first plate portion 21. ing. The three first displacement measuring units 4, 4, 4 are arranged between the three moving units 24, 24, 24 and the center 21 c of the first plate unit 21, respectively. Note that the three first displacement measuring units 4, 4, 4 may be arranged at the center between the adjacent moving units 24, 24.

The three second displacement measuring units 8, 8, 8 are configured to be able to measure the relative displacement in the vertical direction between the second plate portion 22 and the cylindrical portion 26, respectively. Thereby, the 2nd displacement measurement part 8 is comprised so that measurement of the relative displacement amount (henceforth a displacement amount of an up-down direction) of the up-down direction with the ceiling part and beam part of the structure 11, and the floor surface 12 is carried out, respectively. Has been.
Such a second displacement measuring unit 8 includes, for example, a barcode reader, an optical displacement sensor using an optical mouse, a displacement sensor using an anotopen, a differential transformer type displacement sensor, and the like. ing.
Further, in the present embodiment, the three second displacement measuring units 8, 8, 8 are arranged at equal intervals in the circumferential direction around the center 22 c of the second plate portion 22 with respect to the second plate portion 22. ing. The three second displacement measuring units 8, 8, 8 are arranged between the three holes 91, 91, 91 formed in the second plate part 22 and the center 22 c of the second plate part 22, respectively. ing.

  In the present embodiment, horizontal displacement data measured by the three first displacement measuring units 4, 4, and 4 and vertical directions measured by the three second displacement measuring units 8, 8, and 8, respectively. The displacement amount data is communicated to a processing unit (not shown), and the processing unit is configured to calculate an accurate horizontal displacement amount and vertical displacement amount based on these data. . The displacement meters 1A and 1B include communication devices for communicating these data from the three first displacement measuring units 4, 4, 4 and the three second displacement measuring units 8, 8, 8 to the processing unit. For storing the displacement amount data measured by the three first displacement measurement units 4, 4, 4 and the three second displacement measurement units 8, 8, 8, the displacement amount data processed by the processing unit, etc. A storage unit or the like is appropriately installed.

When the switch sphere 51 and the switch sphere 51 come into contact with each other, the switch sphere 51 can move while rotating along the floor surface 12 while being inserted into the hole 21 a of the first plate portion 21 of the support 2. Three mechanical displacement switches 52, 52,... For driving the three first displacement measuring units 4, 4, 4 and the three second displacement measuring units 8, 8, 8.
The switch sphere 51 is formed to have a diameter slightly smaller than the inner diameter of the hole 21 a of the first plate portion 21. When the switch sphere 51 is inserted into the hole 21 a of the first plate portion 21, the first plate portion 21 is configured to be movable within the hole 21a. Further, the switch sphere 51 is configured such that when it is inserted into the hole 21 a of the first plate portion 21, the upper side of the first plate portion 21 is inserted inside the connecting portion 23.

Such a switch sphere 51 has a very small mass as compared with the structure 11 and is configured to be displaceable even by minute vibration that does not cause the structure 11 to be displaced (deformed). For this reason, the switch sphere 51 can be displaced even by a minute vibration such that the support 2 supported by the structure 11 does not move, and the support 2 and the switch sphere 51 behave differently due to the minute vibration. It is configured.
Note that the friction coefficient between the switch sphere 51 and the floor surface 12 is smaller than the friction coefficient between the movement sphere 24 b of the moving unit 24 and the floor surface 12, and even if a vibration such as an earthquake occurs. You may be comprised so that it may stay at substantially one point without shaking. When the floor 12 and the support 2 are relatively displaced, the support 2 and the switch sphere 51 may be configured to behave differently.

The mechanical switches 52, 52,... Are arranged at equal intervals along the edge of the hole 21 a of the first plate portion 21.
In such a switch unit 5, the switch sphere 51 inserted in the hole 21 a of the first plate portion 21 of the support 2 and the support 2 is stationary when the earthquake vibration or the like does not occur normally. The spherical body 51 and the mechanical switches 52, 52,... Provided at the edge of the hole 21a of the first plate portion 21 are separated from each other. When the earthquake or the like occurs in the switch unit 5, the switch sphere 51 behaves differently from the support 2 so that one or more of the four mechanical switches 52, 52,. Touch.

In the present embodiment, when the switch sphere 51 comes into contact with any one or more of the four mechanical switches 52, 52,..., The three first displacement measuring units 4, 4, 4, and Power is supplied to the three second displacement measuring units 8, 8, 8 so that the three first displacement measuring units 4, 4, 4 and the three second displacement measuring units 8, 8, 8 are driven. Has been. At this time, if the switch sphere 51 is configured to be displaceable by slight vibration, the switch sphere 51 can come into contact with any one or more of the four mechanical switches 52, 52,. Therefore, the relative displacement amount between the support 2 and the floor 12 can be measured from the state of slight vibration.
The three first displacement measuring units 4, 4, 4 and the three second displacement measuring units 8, 8, 8 that are driven are in a fixed period in which a state in which a displacement amount greater than or equal to a predetermined value is not measured is set After a lapse of time, the power supply from the battery is stopped and the measurement is stopped.

In the present embodiment, the three first displacement measuring units 4, 4, 4 and the three second displacement measuring units 8, 8, 8 that are driven are continuously in a state in which the amount of displacement being measured is 0 mm. When 10 seconds elapse, the supply of power from the battery is stopped and the measurement is stopped.
In this embodiment, the signal from the switch unit 5 and the value of the measured quantity measured by the three first displacement measuring units 4, 4, 4 and the three second displacement measuring units 8, 8, 8 are used. The power supply from the battery to the three first displacement measuring units 4, 4, 4 and the three second displacement measuring units 8, 8, 8 is controlled, and the three first displacement measuring units 4, 4, 4, and 3 are controlled. A control unit (not shown) for controlling driving and stopping of the two second displacement measuring units 8, 8, 8 is provided.

  The battery is disposed, for example, between the first plate portion 21 and the second plate portion 22 of the support body 2 or an upper portion of the second plate portion 22. In addition, when the battery is arranged on the upper part of the second plate portion 22, it is easy to replace the battery.

The displacement meters 1A and 1B include a first cover portion 64 that surrounds the three first displacement measurement units 4, 4, and a second cover that surrounds the three second displacement measurement units 8, 8, and 8. Part 65.
In FIG. 2, the front side portion of the first cover portion 64, the front side portion of the second cover portion 65, and a part of the upper plate portion 65b are omitted, and in FIG. The upper plate portion 65b of the cover portion 65 is omitted.

The first cover portion 64 is connected to the entire outer edge of the first plate portion 21 and extends toward the floor surface 12. The first cover portion 64 is attached to the lower end portion of the plate portion 64 a and slightly attached to the floor surface 12. And a brush material 64b in contact with.
The second cover portion 65 is connected to a plate-like side plate portion 65a that is connected to the entire outer periphery of the second plate portion 22 and extends upward, and is connected to the upper end portion of the side plate portion 65a. And an upper plate portion 65b disposed in parallel with each other. The upper plate portion 65b is a member that constitutes the support member 2 such as the column portion 26 or a member that constitutes the support member 13 even when the first plate portion 21 and the second plate portion 22 are relatively displaced in the vertical direction. It is configured so as not to interfere with. For this reason, a hole (not shown) or the like is appropriately formed in the upper plate portion 65b.

The first cover part 64 and the second cover part 65 prevent foreign matter from entering from the outside to the inside of the first cover part 64 and the second cover part 65. The first cover part 64 and the second cover part 65 are made of an impermeable material that does not transmit light, and light enters the inside of the first cover part 64 and the second cover part 65 from the outside. It is maintained at a constant brightness.
In addition, when a hole is formed in the upper plate portion 65b, the shape of the hole is set so that light entering the inside from the outside of the second cover portion 65 through the hole is minimized. ing.

  Next, a processing method by the processing unit of the displacement amount data (hereinafter referred to as data) measured by the three first displacement measuring units 4, 4 and 4 will be described based on the flowchart shown in FIG. Note that the processing method of the displacement data measured by the three second displacement measuring units 8, 8, and 8 is the displacement data measured by the three first displacement measuring units 4, 4, and 4, respectively. The processing is performed in the same manner as the processing method by the processing unit (hereinafter referred to as data), and the description is omitted.

(Measurement step)
The relative displacement amounts of the support 2 and the floor 12 are respectively measured by the three first displacement measuring units 4, 4 and 4 of the displacement meters 1A and 1B described above (S-1).

(Correction step)
In the measurement step (S-1), the relative displacement data (hereinafter referred to as data) between the support 2 and the floor surface 12 measured by the three first displacement measuring units 4, 4, and 4 are axially corrected, and the reference and The time history of two pieces of data other than the one piece of data is matched with one piece of reference data (S-2).

(Selection step)
Of the three data whose axes have been corrected in the correction step (S-2), data for the subsequent average value calculation step is selected (S-3).
First, it is determined whether or not the three data are missing (S-4).
If it is determined in this determination (S-3) that there is no missing data, a standard deviation is calculated from the three data (S-5).
Then, it is determined whether or not there is an abnormal value outside the standard deviation range in the data (S-6).
If it is determined in this determination (S-6) that there is no abnormal value outside the standard deviation range, three data are selected (S-7).

If it is determined in this determination (S-6) that the data has an abnormal value outside the standard deviation range, the first displacement obtained by measuring the data outside the standard deviation range in the measurement step (S-1). Changes in data measured by the first displacement measuring unit 4 that measures data within the standard deviation range are applied with reference to data measured immediately before the data outside the standard deviation range is measured by the measuring unit 4. Correction data is calculated (S-8).
Then, the correction data and data within the standard deviation are selected (S-9).

  Further, in the determination of whether or not the three data are missing (S-4), if there is a missing data, the data that is not missing is selected (S-10).

(Average value calculation step)
Selection process (S7, S9, S10) of the selection step (S-3) The average value of the selected data is calculated, and this average value is used as the relative displacement (representative value) between the support 2 and the floor surface 12. (S-11).

Next, a method of calculating the torsional vibration of the structure 11 from the displacement amount of the structure 11 measured by the two displacement meters 1A and 1B as described above will be described. Here, it is assumed that the structure 11 is rotated from the state shown in FIG. 1 around an axis orthogonal to the horizontal plane as shown in FIG .
First, displacement amounts XA and XB in the X direction and displacement amounts YA and YB in the Y direction measured by the two displacement meters 1A and 1B, respectively, are shown as time histories. In FIG. 6, the displacement amounts YA and YB in the Y direction respectively measured by the two displacement meters 1A and 1B are shown as time histories.
Then, as shown in FIG. 7, the difference XA−XB (Torsion (X)) between the X-direction displacement amount XA measured by the displacement meter 1A and the X-direction displacement amount XB measured by the displacement meter 1B is calculated. To do.

Similarly, for the Y direction, a difference YA−YB (Torsion (Y)) between the displacement amount YA in the Y direction measured by the displacement meter 1A and the displacement amount YB in the Y direction measured by the displacement meter 1B is calculated.
Then, an installation interval L between the displacement meters 1A and 1B, a difference XA−XB (Torsion (X)) between the displacement amount XA in the X direction measured by the displacement meter 1A and the displacement amount XB in the X direction measured by the displacement meter 1B. ), And the difference YA−YB (Torsion (Y)) between the displacement amount YA in the Y direction measured by the displacement meter 1A and the displacement amount YB in the Y direction measured by the displacement meter 1B, the structure 11 is displaced. The rotation angle in the horizontal plane (torsional vibration, θ = ATAN (Torsion / L)) is calculated.

In this embodiment, in addition to the rotation of the structure 11 about the axis orthogonal to the horizontal plane, the structure 11 rotates from the state shown in FIG. 1 about the axis orthogonal to the vertical plane as shown in FIG. 8 (rocking vibration). A method of calculating the rocking vibration of the structure 11 from the displacement amount of the structure 11 measured by the displacement meters 1A and 1B will be described.
First, as shown in FIG. 9, the displacement amounts ZA and ZB in the Z direction measured by the two displacement meters 1A and 1B are shown as time histories.

Next, displacements ZA and ZB in the Z direction measured by the two displacement meters 1A and 1B are shown as time histories. Then, a difference ZA−ZB (Rocking) between the displacement amount ZA in the Z direction measured by the displacement meter 1A and the displacement amount ZB in the Z direction measured by the displacement meter 1B is calculated.
And the installation interval L of the displacement meters 1A and 1B, and the difference ZA−ZB (Rocking / L) between the displacement amount ZA in the Z direction measured by the displacement meter 1A and the displacement amount ZB in the Z direction measured by the displacement meter 1B. ), The rotation angle (rocking vibration, θ = ATAN (Rocking / L)) in the vertical plane when the structure 11 is displaced is calculated.

Next, operations and effects of the above-described structure vibration measuring method will be described with reference to the drawings.
In the vibration measurement method of the structure according to the first embodiment described above, the displacement amount measured by the two displacement meters 1A and 1B installed at an interval on the structure 11 and the two displacement meters 1A and 1B are installed. The torsional vibration of the structure 11 can be easily measured based on the position and the distance between the two displacement meters 1A and 1B.
Further, the two displacement meters 1A and 1B are configured to be able to measure the amount of displacement of the structure 11 in the vertical direction, respectively, so that the rocking vibration of the structure 11 can be easily measured.
Moreover, in this embodiment, since the two displacement meters 1A and 1B are arrange | positioned at the seismic isolation layer 11a, the motion of an isolator is computable based on the state of rocking vibration.

(Second Embodiment)
Next, the second embodiment will be described with reference to the accompanying drawings. However, the same or similar members and parts as those of the above-described second embodiment are denoted by the same reference numerals, and the description thereof will be omitted. Will be described.
As shown in FIGS. 10 and 11, in the vibration measurement method for a structure according to the second embodiment, four displacement meters 1A to 1D are arranged for the structure. The displacement meters 1A and 1B are arranged at substantially the same positions as in the first embodiment, and the displacement meters 1C and 1D are spaced apart in the X direction on the floor surface 12 of the seismic isolation layer 11a of the structure 11 in the Y direction. The positions are arranged so as to be substantially the same. Displacement meters 1C and 1D are arranged in the vicinity of both ends in the X direction of the structure 11 and in a substantially central part in the Y direction of the structure.
Moreover, these four displacement meters are each arrange | positioned in the vicinity of the isolator.

  In the structure vibration measuring method according to the second embodiment, it is possible to measure torsional vibration and rocking vibration of the structure 11 in more detail than in the first embodiment.

As mentioned above, although embodiment of the vibration measuring method of the structure by this invention was described, this invention is not limited to said embodiment, In the range which does not deviate from the meaning, it can change suitably.
For example, in the above embodiment, the displacement meters 1A to 1B including the three first displacement measuring units 4, 4, 4 and the three second displacement measuring units 8, 8, 8 are used. As long as it is possible to measure, the form of the displacement meter may be other than the above. For example, in the above embodiment, the three first displacement measuring units 4, 4, 4 and the three second displacement measuring units 8, 8, 8 are provided, but the number of the first displacement measuring units 4 to be installed is provided. And the number of the 2nd displacement measurement parts 8 may be suitably set as 1 or 2 or 4 or more. An accelerometer, a ruler, etc. may be used as the displacement meter.

  In the above-described embodiment, two or four displacement meters 1A, 1B,... Are installed in the structure 11, but three or five or more displacement meters 1A, 1B,. May be configured to calculate the torsional vibration or rocking vibration of the structure 11 based on the displacement measured by the displacement meters 1A, 1B.

Moreover, in said embodiment, although the structure 11 is a seismic isolation structure and the displacement meter 1A, 1B ... is provided in the seismic isolation layer 11a, the structure 11 does not need to be a seismic isolation structure, Even when the structure 11 is a seismic isolation structure, the displacement meters 1A, 1B... In addition, when the structure 11 is a seismic isolation structure, it is preferable that the displacement gauges 1A, 1B... Be installed in a layer close to the ground surface such as the seismic isolation layer 11a, the first floor, the first basement floor, When 11 is not a seismic isolation structure, it is preferably installed in a layer close to the ground surface such as the first floor or the first basement.
Further, the structure vibration measuring method according to the present embodiment may be used when measuring not only the displacement of the structure due to an earthquake or wind pressure but also the secular displacement of the structure.

Further, in the above embodiment, the torsional vibration of the structure 11 is calculated from the amount of displacement in the horizontal direction of the structure 11 measured by the displacement meters 1A, 1B... And the position where the displacement meters 1A, 1B. Are calculated so as to calculate the rocking vibration of the structure 11 from the amount of displacement in the vertical direction of the structure 11 measured by the displacement meters 1A, 1B.
On the other hand, in the present invention, only the torsional vibration of the structure 11 is calculated from the amount of horizontal displacement of the structure 11 measured by the displacement meters 1A, 1B... And the position where the displacement meters 1A, 1B. It may be configured.
In the present invention, only the rocking vibration of the structure 11 is calculated from the amount of displacement in the vertical direction of the structure 11 measured by the displacement meters 1A, 1B... And the position where the displacement meters 1A, 1B. May be.

When measuring the rocking vibration of the structure 11, for example, as shown in FIG. 12, displacement gauges 1 </ b> E and 1 </ b> F attached to the outer wall 15 of the structure 11 at positions spaced apart in the horizontal direction are used. The structure 11 may be configured to be able to measure the amount of vertical displacement of the structure 11.
In the form shown in FIG. 12, the displacement meters 1E and 1F are supported by a support member 16A attached to the outer wall 15 so as to be movable along the ground surface. The support member 16A includes a first bar 161 rigidly joined to the outer wall 15, a second bar 162 whose upper side is pin-joined to the first bar 161 and whose lower side is joined to the displacement gauges 1E and 1F, have.
When measuring the rocking vibration of the structure 11, for example, as shown in FIG. 13, displacement gauges 1 </ b> G and 1 </ b> H attached to the inner wall 17 of the structure 11 at positions spaced apart in the horizontal direction respectively. The structure 11 may be configured to be able to measure the amount of vertical displacement of the structure 11.
In the form shown in FIG. 13, the displacement meters 1 </ b> G and 1 </ b> H are supported so as to be movable along the floor surface 12 of the structure 11 by a support member 16 </ b> B attached to the inner wall 17. The support member 16B includes a first bar 163 rigidly joined to the inner wall 17, a second bar 164 whose upper side is pin-joined to the first bar 163 and whose lower side is joined to the displacement gauges 1F and 1G, have.

1A to 1H Displacement meter 11 Structure 11a Seismic isolation layer 12 Floor surface

Claims (4)

A plurality of displacement meters that measure the amount of displacement in the biaxial direction in the horizontal direction of the structure are installed on the same floor of the structure at intervals in the horizontal direction in the same plane ,
The height of the structure from the displacement amount in the horizontal direction of the two axial directions of the structure were measured, and the horizontal spacing of the displacement gauge each other of the plurality of the locations where the plurality of displacement gauges are installed respectively A vibration measurement method for a structure, characterized by calculating a torsional vibration in a direction around an axis extending in a direction . The plurality of displacement meters are configured to be able to measure the amount of displacement in the vertical direction of the structure,
Said plurality of displacement gauges are calculated and vertical displacement of the structure were measured, and the horizontal spacing of the displacement gauge each other the plurality of the rocking of the structure from the place where it has been installed, respectively The method for measuring vibration of a structure according to claim 1. A plurality of displacement gauges for measuring the amount of displacement in the vertical direction of the structure are installed on the same floor of the structure at intervals in the horizontal direction within the same plane ,
Said plurality of displacement gauges are calculated and vertical displacement of the structure were measured, and the horizontal spacing of the displacement gauge each other the plurality of the rocking of the structure from the place where it has been installed, respectively A vibration measurement method for a structure characterized by the above. The plurality of displacement meters are respectively arranged in positions near the edge of the structure and symmetrical with respect to the rigid center of the structure in plan view. A vibration measurement method for a structure according to claim 1.

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