JP2619453B2 - Seismic isolation element test equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to seismic isolation for testing and evaluating the reliability (breaking characteristics) of seismic isolation elements for protecting reactor containment vessels and building structures from earthquakes. The present invention relates to an element test device.

[Conventional technology]

Conventionally, a link mechanism type seismic isolation element testing apparatus as shown in FIG. 4 is known. This device is configured such that a link device is supported by upper and lower slide bearings with a test piece in a central portion interposed therebetween, and is capable of moving horizontally while receiving a vertical load (only compression). However, this device can only apply a compressive load in the vertical direction, and does not break it. Related devices of this type include, for example, those described in JP-B-54-44461.

[Problems to be solved by the invention]

In the link mechanism system shown in FIG. 4, there is play at the joint portion of the link, the rigidity of the link is low, and only a compressive force can be applied to the test body in the vertical direction.
A rotation component is generated at the time of a horizontal-up / down combined force, and accuracy is reduced. In addition, there were problems such as the joint part of the link being damaged and the link being deformed due to the recoil from the test piece at the time of breaking.

SUMMARY OF THE INVENTION An object of the present invention is to provide a seismic isolation element testing apparatus which has high rigidity without play and does not give a rotating motion (yawing, pitching, rolling) to a test body.

[Means for solving the problem]

The above objective is to solve the backlash, consists of a hydrostatic bearing, slide bearing and table, the hydrostatic bearing is short, and the rotation is joined through a 20-50 micron oil film between the bearing and the shaft. This is achieved by eliminating mechanical play.

As a means to increase the rigidity, if the oil film of the bearing part is 50 microns as described above and the force in that case is 600,000 kg, the rigidity is increased. Thus, very high rigidity is obtained, and the object is achieved.

[Action]

One of the seismic isolation elements (test object) is fixed by a jig, and the other is fixed to a table. The table moves at right angles to each other in the XY direction, and the XY
The seismic isolation element expands and contracts under the force of the coupling action.

The table is fixed to a hydrostatic joint that moves in the Y direction with a small frictional force. The X-axis and Y-axis vibrators are provided with swivel joints at both ends. One of the static pressure joints is fixed to the foundation, and the force in the X and Y directions is transmitted to the static pressure joints. Since the table is fixed to the hydrostatic joint, the force of the vibrator is transmitted to the seismic isolation element via the hydrostatic joint and the table.

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

The hydrostatic joint allows Y-axis motion and transmits the Y-axis motion to the table.

The slide bearing allows the X-axis movement and allows the X-axis movement while restricting the rotational movement caused by the Y-axis movement.

〔Example〕

FIG. 1 shows an embodiment. The mounting jig 1 receives the reaction force of the seismic isolation element 2. The table 3 gives the seismic isolation element 2 a vibration force in the Y-axis and the X-axis. The hydrostatic joint 4 fixes the table 3. The hydrostatic joint 4 allows a force in the Y-axis direction, transmits a force in the X-axis direction, and restrains the rotational force from the seismic isolation element 2. The slide bar 5 and the hydrostatic bearings 4a, 4b, 4c, 4d are fitted. The slide bar 5 allows a force in the X direction and a slide bearing 7 for restraining the rotational force generated by the force in the Y direction.
It is fixed to.

The hydrostatic joint 4 is connected to a Y-axis vibrator by a swivel joint 8 in the Y-axis direction, and is connected to an X-axis vibrator by a swivel joint 8 in the X-axis direction. X
Each of the shaft and Y-axis vibrators is connected to a foundation via a swivel joint 8 'via a load cell 9 for measuring a vibrating force.

The shaft 7c and the bearings 7a and 7b are fitted to the slide bearing 7, and the shaft 7c is fixed to the shaft support device 6, and the shaft support device 6 is fixed to the foundation.

FIG. 2 is a sectional plan view showing details of the hydrostatic joint 4 and the slide bearing 7. FIG. 3 is a detailed vertical sectional view of the hydrostatic joint 4 and the slide bars 5, 5 '.

The slide bar 5, 5 'hydrostatic bearing _{4a 1, 4a 2, 4b 1} , 4b 2, 4c 1, 4
It is levitated and supported by a minute oil film by c ₂ , 4d ₁ , 4d ₂ , 4e ₁ , 4e ₂ , 4f ₁ , 4f ₂ . Pressure Ps for each hydrostatic bearing
Oil is supplied.

Third, as shown in FIG, electrostatic圧継hands 4 'fitted, slide bars 5,5' slide bar 5, 5 are levitated by small oil film hydrostatic bearing 4a ₁ ~4f is vertically and horizontally respectively Floating supported by _one .

 The operation principle will be described below.

(1) Description of Operation Based on FIG. 1 When the X-axis exciter 10 transmits a tensile force to the hydrostatic joint 4 via the load cell 9 and the sweeping joint 8, the seismic isolation element 3 moves in the X-axis direction. extend. At this time, slide bearing 7
The Y-axis vibrator 10 ′ connected to the slide bar 5 and the static pressure joint 4 in the Y direction is guided by the shaft 7 c and the slide bearing 7 and moves in the X direction. Next, when a vibrating force is applied to the hydrostatic joint 4 in the direction in which the Y-axis vibrator 10 'pushes out, the hydrostatic joint 4
Is guided by the slide bar 5, and the table 3 and the seismic isolation element 2 fixed to the hydrostatic joint 4 move upward in the Y-axis.
At this time, the X-axis vibrator 10 connected to the hydrostatic joint by the swivel joint 8 also moves upward in the Y-axis.

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 grounded by the mounting jig 1.
The rotation reaction force acts on the hydrostatic joint 4 because it is fixed to 11.

(2) Description of Operation of Rotational Constraint Based on FIG. 2 The rotational force generated by the X-axis / Y-axis coupled vibration in (1) above acts on the hydrostatic joint 4 and fits into the hydrostatic joint 4. And transmitted to the slide bar 5 via an oil film, transmitted to the slide bearing 7 and the shaft 7c, and constrained and supported by the shaft support devices 6, 6 '. You.

(3) Correction of crosstalk between X axis and Y axis When the XY coupled vibration is performed as described above, the X axis is rotated between the X axis and the Y axis around the swivel joint 8 '. Is the crosstalk due to the displacement of the Y axis, and the Y axis is the X
Crosstalk occurs due to shaft displacement.

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

(4) Rotational constraint force of the embodiment The rotation moment of the embodiment is a Z-axis excitation force of 600 ton, Y-axis displacement
If it is 60 cm, the rotational moment is 600 ton × 60 cm = 36,000 ton-cm, which is received by the hydrostatic bearings 4a, 4b, 4c, 4d and the slide bearing 7 and the bearings 7a, 7b.

〔The invention's effect〕

According to the present invention, there is no backlash and an accurate 2
Dimensional force can be applied. The control accuracy for a displacement of ± 600 mm with two-dimensional force is 0.1% or more. Furthermore, since the rotational motion has a high oil film stiffness of 1.2 × 10 ⁸ kg / cm ² , there is no need for rotation suppression control, so the control accuracy is 0.1% even for large moments such as 600,000 kg-m. Can be kept more.

Then, the impact reaction force generated when the test piece breaks can be received by the hydrostatic bearing and the slide bearing. When the impact reaction exceeds the force of the vibrator, the force is transmitted to the vibrator and is absorbed by a shock absorber mechanism built in the vibrator.

In the test up to the breakage of the test piece, it is not preferable from the viewpoint of the characteristic analysis that the rotational movement is mixed, so it is very important to suppress the rotational movement, and the present invention can achieve this object.

[Brief description of the drawings]

FIG. 1 is a plan view of a seismic isolation element test apparatus, FIG.
FIG. 3 is a longitudinal sectional view of a hydrostatic joint, and FIG. 4 is an elevation view and a side view of a conventional link-type seismic isolation element testing apparatus. 1. Specimen mounting jig, 2. Specimen (seismic isolation element), 3
…… Table, 4 …… Static pressure fitting, 5 …… Slide bar,
6 ... Shaft support device, 7 ... Slide bearing, 7c ...
Axis 8 Swivel joint 9 Load cell
10: Exciter, 4a ₁ , 4a ₂ , 4f ₁ , 4f ₂ … Static bearing, 7
a, 7b: Bearing (hydrostatic bearing or slide bearing), 10: Basic.

Claims (1)

(57) [Claims] 1. A seismic isolation element test apparatus in which vertical movements are at right angles to each other and perform independent or interlocking force. A vertical vibration mechanism having a swivel joint attached to both ends, and a vertical vibration mechanism A horizontal vibrating mechanism to which a swivel joint is attached, a vertical pressure vibrating mechanism to which one end of each of the vertical vibrating mechanism and a horizontal vibrating mechanism is mounted, and a slide to be fitted to the static pressure coupling A bar, a slide bearing to which an end of the slide bar is attached, for guiding the horizontal movement, and a table for holding a test object fixed to the hydrostatic joint, wherein the vibration mechanism for vertical movement and the horizontal The swivel joints at the other end of each of the moving vibration mechanisms are fixed, and the vertical and horizontal vibration mechanisms are arranged at substantially right angles. A seismic isolation element testing apparatus characterized in that it is possible to add a horizontal or horizontal simultaneous excitation force.