JPH01178844A - Testing apparatus of vibration relief element - Google Patents

Abstract

PURPOSE:To eliminate play and not to give a rotating motion to a testing body, by a construction wherein an apparatus is constructed of a hydrostatic bearing, a slide bearing and a table, the hydrostatic bearing being formed to be rectangular, and the rotating motion being joined through the intermediary of an oil film of 20-50mu in a gap between the hydrostatic bearing and a shaft. CONSTITUTION:A fitting jig 1 accepting a counter force of a vibration relief element 2, a table 3 giving a vibration force in the axes Y-X to the vibration relief element 2, and a hydrostatic joint 4 fixing the table 3, are provided. When an X-axis vibrator 10 transmits a pull strength to the hydrostatic joint 4 through a load cell 9 and a swivel joint 8, the vibration relief element 3 is extended in the direction of the axis X. When the vibration relief element 2 is moved in the directions of the axes X and Y, a counter force of rotation acts on the hydrostatic joint 4 since one end of the vibration relief element 2 is fixed to the base 11 by the fitting jig 1. This force is transmitted to hydrostatic bearings 4a-4d fitted in the hydrostatic joint 4 and further to a slide bar 5 through an oil film and to a slide bearing 7 and a shaft 7c, so as to cramp and support shaft supporting devices 6 and 6'.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is a seismic isolation system for testing and evaluating the reliability (rupture characteristics) of seismic isolation elements for protecting nuclear reactor containment vessels and building structures from earthquakes. Regarding element test equipment.

[Conventional technology]

Conventionally, a link mechanism type seismic isolation element testing device as shown in FIG. 4 has been known. There is a seismic isolation element test device in which a link device is supported by upper and lower slide bearings across a test specimen in the center, and is capable of horizontal movement while receiving vertical loads (compression only). This device only compresses the upper and lower parts, but does not cause breakage. A related device of this type is, for example, Japanese Patent Publication No. 44461/1983.

[Problem to be solved by the invention]

The link mechanism method introduced in Figure 4 has some problems, such as the play in the joint of the link, the low rigidity of the link, and the fact that only compressive force can be applied to the test specimen in the vertical direction. A rotational component is generated when applying force to achieve this, reducing accuracy. In addition, there were problems such as the joint part of the link being damaged or the link being deformed due to the reaction from the test specimen at the time of breakage.

An object of the present invention is to provide a seismic isolation element testing device that is free from backlash, has high rigidity, and does not impart rotational motion (yawing, pitching, rolling) to a test specimen.

[Means to solve the problem]

The above purpose is to solve the looseness by constructing a structure consisting of a hydrostatic bearing, a slide bearing, and a table.
This is achieved by bonding via a micron oil film and eliminating mechanical play.

In addition, as a means to increase the rigidity, the oil film on the bearing part is set to 50 microns as described above, and the force in that case is set to 600.000.
kg, the stiffness is 0.005 .mu.kg, which is a very high stiffness, so the purpose is achieved.

[Effect]

One side of the seismic isolation element (test object) is fixed by a jig, and the other side is fixed to a table.

The tables move at right angles to each other in the X-X direction, and the seismic isolation element expands and contracts under the X-Y coupled force from the table.

The table is fixed to a static pressure joint that moves in the X direction with a small frictional force. The X- and Y-axis exciters have swivel joints at both ends, one of which is fixed to a static pressure joint and the other fixed to the foundation, transmitting forces in the X and X directions to the static pressure joint. The table is fixed to a static pressure joint, so the force of the shaker is applied to the static pressure joint.

transmitted to the seismic isolation element via the table.

The mounting jig fixed to the foundation receives the reaction force of the seismic isolation element.

The static pressure joint allows X-axis motion and transmits the X-axis motion to the table.

The slide bearing allows X-axis movement, and allows X-axis movement while restraining rotational movement caused by the X-axis movement.

〔Example〕

An example is shown in FIG. Mounting jig that receives the reaction force of the seismic isolation element 2 1. A table 3 that applies an excitation force along the Y-axis and the X-axis to the seismic isolation element 2, and a static pressure joint 4 that fixes the table 3.
The static pressure joint 4 allows the force in the Y-axis direction, transmits the force in the X-axis direction, and restrains the rotational force from the seismic isolation element 2. The slider 5 and the static pressure bearing 4a.

4b, 4c, and 4d, and the slide par 5 is fixed to a slide bearing 7 that allows a force in the X direction and restrains rotational force generated by the force in the X direction.

A Y vibration exciter is connected to the static pressure joint 4 by a swivel joint 8 in the Y-axis direction, and an X-axis vibration exciter is connected to the static pressure joint 4 by a swivel joint 8 in the X-axis direction. The exciter is connected to the foundation via a load cell 9 that measures the excitation force, and the other end is connected to the foundation by a swivel joint 8'.

The slide bearing 7 includes a shaft 7c and a bearing 7a.

7b is fitted, and the shaft 7C is fixed to the shaft support device i\6,
The shaft support device 6 is fixed to the foundation.

FIG. 2 is a plan sectional view showing details of the hydrostatic joint 4 and slide bearing 7. As shown in FIG. FIG. 3 shows a detail in vertical section of the static pressure continuation 4 and the slide par 5.5'.

Slide pars 5 and 5' have hydrostatic bearings 4ax and 4az.

4b1, 4bz, 4cs, 402.4dt, 4dz.

4ez, 4ez+ 4f engineering, 4fz are supported floating by a minute oil film. Each hydrostatic bearing has a structure in which pressure oil Ps is supplied.

As shown in FIG. 3, the hydrostatic joint 4 fits the slide pars 5, 5' which are floated by a minute oil film, and the slide pars 5, 5' are fitted with hydrostatic bearings 4a on the top, bottom, left and right, respectively.
It is floatingly supported by s~4fz.

The operating principle will be explained below.

(1) Operation explanation based on Figure 1 X-axis vibration +! When the tensile force of &1o is transmitted to the static pressure joint 4 via the load cell 9° sweep joint 8, the vibration isolation element J3 extends in the X-axis direction.

At this time, the Y-axis vibrator 10' is connected to the slide bearing 7, the slide par 5, and the static pressure joint 4 in the X direction.
is guided by the shaft 7C and the slide bearing 7 and moves in the X direction. Next, when the Y-axis vibrator 10' applies an excitation force in the pushing direction to the static pressure joint 4, the static pressure joint 4 moves to the slide par 5.
The table 3 and the seismic isolation element 2 fixed to the static pressure joint 4 move upward along the Y axis. At this time, the X-axis vibrator 10 connected to the static pressure joint by the swivel joint 8 also moves upward in the Y-axis direction.

As described above, when the seismic isolation element 2 is moved in the X-axis direction and the Y-axis direction, one end of the seismic isolation element 2 is attached to the foundation 1 by the mounting jig 1.
1, a rotational reaction force acts on the static pressure joint 4.

(2) Operation explanation of rotational restraint based on Figure 2 (1) above
The rotational force generated by the X-axis and Y-axis coupled vibration acts on the static pressure joint 4, and the static pressure bearing 4 fitted to the static pressure joint 4
a, 4b, 4c.

4d, is transmitted to the slide par 5 via an oil film, and is transmitted to the slide bearing 7 and shaft 7c, and is restrained and supported by shaft support devices 6 and 6'.

(3) Crosstalk correction between the X and Y axes When the X-Y coupled excitation is performed as described above, between the X and Y axes,
By rotating around swivel joint 8',
Crosstalk occurs on the Y-axis due to displacement on the Y-axis, and crosstalk occurs on the Y-axis due to displacement on the X-axis.

In order to correct this crosstalk, the X-axis can be mutually corrected by performing trigonometric function correction by Y-axis displacement, and the Y-axis by performing trigonometric function correction by X-axis displacement.

(4) Rotational restraint force in the example The rotational moment in the example is an X-axis excitation force of 600 tons,
If the Y-axis displacement is 60, the rotational moment is 600 tonsX 60aa = 36,000ton-a
m, and these are the static pressure bearings 4a, 4b, and 4c.

4d, and the slide bearing 7 and bearing 7a.

Receive it at 7b.

〔Effect of the invention〕

According to the present invention, there is no backlash at all, and highly accurate two-dimensional force can be applied. Also, the displacement due to two-dimensional force is ±600+a
The control accuracy for this is 0.1% or more. Furthermore, since the oil film stiffness is as high as 1.2X10δ-/d for rotational motion, one-rotation inhibition control is not required, so the one-rotation moment is 600,000.
Control accuracy of 0.1% or more can be maintained even for large moments such as 0 kg-m.

The impact reaction force generated when the test specimen breaks can be stopped by the hydrostatic bearing and the slide bearing.

this? #When the impact force exceeds the applied force of the exciter, the force is transmitted to the exciter and is absorbed by the shock absorbing mechanism built into the exciter.

Since it is undesirable for characteristic analysis to include one-rotation motion in the test leading to the test specimen's failure, it is very important to suppress rotational motion, and this objective can be achieved by the present invention.

[Brief explanation of the drawing]

Figure 1 is a plan view of the seismic isolation element testing device, Figure 2 is a cross-sectional view of the static pressure joint that suppresses rotational movement and can apply two-dimensional force.
FIG. 3 is a longitudinal sectional view of a static pressure joint, and FIG. 4 is an elevational and side view of a conventional link type seismic isolation element testing device. 1... Test specimen mounting jig, 2... Test specimen (seismic isolation element)
, 3... Table, 4... Static pressure joint, 5... Slide par, 6... Shaft support device, 7... Slide bearing, 7c... Shaft, 8... Swivel joint, 9... Load cell, 10-... Vibrator, 4 al,
4 ax, --4fte4fz...static pressure bearing, 7
a, 7b...Bearing (static pressure bearing, 1st I21 2nd recess 5 large A) + - 3rd recess 4th (2)

Claims (1)

[Claims] 1. In a seismic isolation element testing device where the vertical and lateral motions are at right angles to each other and apply force independently or in conjunction, the vertical swivel joint vibration machine, the horizontal swivel joint vibration machine and the vibration force are used. static pressure joints that transmit vibrations, guide the table vertically using minute friction and restrain rotational motion, slide bearings that use minute frictional force to guide the table laterally and restrain rotational motion, and slide bearing shaft support devices. A seismic isolation element testing device characterized in that it applies vertical motion alone, lateral motion alone, or simultaneous vertical-horizontal coupled excitation force to a test object.