JP3033371B2 - Performance confirmation method of seismic isolated floor system and seismic isolated floor horizontal force test device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for confirming the performance of a base-isolated floor system that has been assembled on site, and a test apparatus for horizontal loading of the base-isolated floor.

[0002]

2. Description of the Related Art In general, a seismic isolation floor system (Dynamic Floor System; DFS) supports an entire floor set from a building frame and is supported by a seismic isolation device. The structure is reduced to

FIG. 8 to FIG. 11 show an example of this, which has a double floor structure in which an upper floor 2 is constructed above a floor surface 1 of the building itself, and a plurality of seismic isolation devices 10 are provided on the floor surface 1 at predetermined intervals. The seismic isolation device 10 is used as a seismic isolation floor 3 that supports the upper floor and absorbs vibrations such as earthquakes.

The seismic isolation device 10 is similar to that disclosed in Japanese Utility Model Publication No. 57-25942, and takes into account the property that the response of a structural floor to an earthquake is usually amplified several times as large as an input seismic wave. The configuration is as follows. That is, in consideration of the nature of the floor response, the vertical spring 11 and the horizontal spring 12 which are soft in both the vertical and horizontal directions are provided to create a vibration system having a longer period than the structure, and further, the hydraulic system provided in the vertical direction The vibration energy in the vertical direction is absorbed by the damper 13 and transmission to the double floor is reduced. This seismic isolation device 10
When a seismic force (acceleration) greater than a set value is applied, slippage occurs in the horizontal direction. In this horizontal direction, an interposition occurs between the base 14 of the seismic isolation device 10 and the slide plate 15 on the floor 1. The sliding friction of the mounted friction material 22 exerts a damper action.

On the other hand, when the seismic isolation floor is elastically supported as described above, frictional force acts in the horizontal direction, so that the floor does not slide in normal times. Environmental vibration is a problem. For this reason, from the viewpoint of maintaining the living environment in normal times, a fixing mechanism that does not allow the seismic isolation device to function in the vertical direction in the vertical direction is provided. That is, the seismic isolation device 10 receives the load of the upper floor 2 by its main body 16, and 90% of the load supported by the main body 16 is placed on the vertical spring 11, and the remaining 10% is placed on the shaft 17 in the center of the main body 16. And the stopper 18 is interposed in a state where the stopper 18 is pulled by a pull-out spring 19. When vertical movement occurs due to an earthquake or the like, the stopper 18 is released by the pulling force of the extraction spring 19 to release the normal fixing mechanism, and the support of the main body 16 is shifted to the elastic suspension by the vertical spring 11. The seismic isolation effect is exhibited. In addition, 20
Is a set bolt screwed from the top plate 16a of the main body 16 to adjust the load sharing ratio between the vertical spring 11 and the shaft 17, 21 is a pressing plate of the vertical spring 11, and 4 is a hydraulic cylinder used for adjusting the load sharing ratio. It is.

[0006]

The seismic isolation device of the above-mentioned seismic isolation floor system is used at a factory in a spring constant test of a single device, a sliding friction between a friction material constituting a sliding bearing of the seismic isolation device and a sliding plate. Tested and shipped.

However, when actually constructing a seismic isolation floor system, since a plurality of seismic isolation devices are installed, the performance may slightly change depending on the installation accuracy at the site. In actual seismic isolation floor systems, there are many shock absorbers around the seismic isolation floor, but the effect of friction is not taken into account when designing. For example, as shown in FIG. 12, a filler 23 made of rubber or the like whose lower part is easier to compress than the upper part is inserted into the gap between the upper floor 2 and the pillars 24 to form a packed floor.
When an earthquake occurs, the packing 23 is moved to the base-isolated floor 1 as shown in the figure.
The structure may be such that it does not transmit the horizontal movement of the columns and the like to the base-isolated floor by climbing upward from the joint 26 with the base 2 (Japanese Patent Publication No. 57-23061). Sometimes not considered.

For this reason, when a seismic isolation floor is assembled on site,
It is extremely important to reconfirm the performance of the seismic isolation floor system, but there has been no means to reconfirm such seismic isolation performance.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and takes into consideration the situation of the seismic isolation floor assembly site (mounting accuracy, connection with surroundings, etc.) and improves the performance of the seismic isolation floor system that has been completed on-site assembly. It is an object of the present invention to provide a checking method and a seismic isolation floor horizontal force test device.

[0010]

In order to achieve the above object, a method for confirming the performance of a base-isolated floor system according to the present invention comprises the steps of:
A force applying means is installed between the
And place a reaction force on the existing structure through the reaction force receiver.
The seismic isolation floor is horizontally moved by the force means , the horizontal force and the amount of movement in the horizontal direction are measured by sensors, and the measured data is processed to calculate the horizontal force P.
(Ton) and the amount of movement δ (cm) are graphed, and the entire friction coefficient μ and spring constant Δk are determined from the graph (claim 1).

[0011] Further, the seismic isolation floor horizontal force test apparatus of the present invention comprises:
Near the center of the base-isolated floor where field assembly was completed ,
Between the floor and the multiple reaction receivers fixed to the existing structure.
Respectively, and the reaction force is applied to the existing structure through the reaction force receiver.
A plurality of hydraulic jacks for applying horizontal force to the seismic isolation floor, a pump unit that operates while synchronizing these hydraulic jacks to move the seismic isolation floor horizontally, a load meter for measuring horizontal applied force, and Displacement meter for measuring the amount of movement in the horizontal direction, and arithmetic processing means for collecting and calculating these measurement data and graphing the relationship between the horizontal force P (ton) and the amount of movement δ (cm) are provided. (Claim 2).

In the seismic isolation floor horizontal force test apparatus, a restoring hydraulic jack and its pump unit may be provided in addition to the hydraulic jack (claim 3). Using a double-acting hydraulic jack,
It can also be used as a hydraulic jack for horizontal loading and for restoring (claim 4).

[0013]

[Function] The first of the performances of the seismic isolation floor system is how much force the seismic isolation device starts to move in the event of an earthquake, that is, when the seismic isolation effect is obtained. Although possible, these are determined by (1) the magnitude of the friction coefficient μ between the seismic isolation device and the sliding plate, and (2) the magnitude of the strength of the horizontal spring (spring inconstant k). Therefore, the whole seismic isolation floor is moved laterally statically, the relationship between the horizontal force P (ton) and the movement amount δ (ton) is grasped, and the overall friction coefficient and spring constant are obtained. Its performance can be confirmed . Especially, since it is after installation on site,
Considering that it is difficult to apply force from outside the floor
And apply force at a position inside the seismic isolation floor.
After installation, as a reaction force receiving when applying the existing structure
Seismic isolation floor that has been completed
At approximately the center of the building, the anti-seismic floor and the
A force applying means is installed between the power receiver and the power receiver.
The seismic isolation floor is leveled by applying force to the installed structure
It is made to move, so that the seismic isolation floor system
Appropriate performance even after building a seismic isolation floor at the site
Can be confirmed again (claim 1).

[0014] MenShinyuka completing the field assembly is intended greater is the floor area of 1000m ² ~2000m ^2, give a horizontal pressure force MenShinyuka completing the field assembly of a plurality of hydraulic jacks, these Upon actuation while tuning the hydraulic jack, you can move the MenShinyuka horizontally obtain a graph of amount of movement and a desired horizontal loading force P (ton) δ (cm)
Wear. Especially after installation on site, force is applied from outside the base-isolated floor
Considering that it is difficult to
And the existing structure after installation
It will be used as a reaction force receiver when applying force to the body.
In other words, almost at the center of the base-isolated floor where on-site assembly has been completed,
Between the base-isolated floor and the multiple reaction supports fixed to the existing structure
Hydraulic jacks are installed for each, and they are already installed via the reaction force receiver.
Takes a reaction force on the structure and is level with the seismic isolation floor by hydraulic jack
The system is designed to provide additional force, which
System performance, even after building the seismic isolation floor on site.
It can be confirmed again immediately (claim 2).

In the seismic isolation floor horizontal loading test apparatus, a restoring hydraulic jack is provided in addition to the loading hydraulic jack to restore the original state (claim 3). By using, it can be used for both horizontal application and restoration, which is advantageous in installation (Claim 4).

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. The seismic isolation device constructing the seismic isolation floor system in the present embodiment is the same as that already described with reference to FIGS.

The first performance of the seismic isolation floor system is how much force the seismic isolation device 10 starts to move during an earthquake, that is, when the seismic isolation effect is obtained. The second is how much tremor can be attenuated. These are (1) the magnitude of the friction coefficient μ between the seismic isolation device 10 and the sliding plate 15;
(2) It is determined by the strength of the horizontal spring 12 (spring constant k). Therefore, the whole seismic isolation floor is statically moved laterally, and the load (ton) as the horizontal force P and the displacement (cm) as the moving amount δ are measured, and the friction coefficient μ and the spring constant of the whole are measured. Confirm the seismic isolation performance of the system by determining Σk.

In an actual site, a large one is 1000
There are floor area m ² ~2000m ^2, which in testing as integral, it is necessary to devise to move the MenShinyuka horizontally. Therefore, as shown in FIG. 1, a plurality of hydraulic jacks 31 are used as force applying means for moving horizontally, and the hydraulic jacks 31 for horizontal force are operated by the pump unit 30 while synchronizing with each other, so that the seismic isolation floor is leveled. Move.
At the same time, the load exerted by the hydraulic jack 31 is detected by the load meter 32, and the amount of movement of the seismic isolation floor in the horizontal direction is detected by the displacement meter 33, and is measured in real time by the digital dynamic strain meter 34. The measured data is collected and processed by the personal computer 35, and the relationship between the horizontal force P (ton) and the movement amount δ (cm) is graphed on the monitor screen. From the graph, the overall spring constant Σk and friction coefficient μ are calculated. Ask. In addition, the hydraulic jack 36 for restoration
And its pump unit 30 are also provided.

FIGS. 2 and 3 show a seismic isolation floor horizontal force test apparatus specifically applied to a computer room seismic isolation floor. The outline of the seismic isolation floor targeted here is as follows.

Seismic isolation floor area: 665 m ² Number of units: 32 full units, 16 half units Fixed load (steel frame weight, equipment weight, panel weight, stand weight, etc.): 58.74 t Loading load: 0.60 t Total load: 59.34 t Designed horizontal spring constant (for 4 pieces): ＝ k = 0.60t Designed friction coefficient: μ = 0.06 (At design load, loading load = 150
Kg / cm ² ) In the figure, A1 to A4 indicate locations where the hydraulic jacks 31 for horizontal force are arranged. Regarding the loading method, taking into account that loading is applied at the position inside the base-isolated floor and that the existing structure is used, the hydraulic jacks 31 are installed at four points approximately in the center of the base-isolated floor. The force was applied and the reaction force was applied to the steel frame bracket 37 anchored to the slab by hole-in. The brackets 37 were used for these A1 to A4 portions, and the hydraulic jacks 31 for applying force were diverted into hydraulic jacks 36 for restoration, which were used at the time of restoring the base-isolated floor. That is, a separate-type double-acting hydraulic jack in which the raising and lowering of the ram can be operated by switching the hydraulic pump is used for the hydraulic jack 31 for loading, and this is used for loading and restoring.
Further, an electric hydraulic pump unit was used as the pump unit 30. Reference numeral 38 denotes a control switch of the pump unit 30 that operates while synchronizing the hydraulic jacks 31.

The maximum deformation δmax due to the horizontal force
Was set to 15 cm in consideration of the use and fitting of the hydraulic jack 31, the performance of the displacement meter, and the like. ΣPma with δmax = 15cm
x = 12.4t, and therefore the reaction force per location is calculated to be a maximum of 3.1t.

Next, regarding the measuring method, a load cell (load cell) 32 is provided as L1 to L4 in the above A1 to A4 parts, and a displacement meter 33 is provided at two places of the above A1 to A4 parts and the terminal end of the base isolation floor. D1 to D6 were provided. The load P (ton) of the horizontal force is calculated by the load cells L1 to L4.
The deformation movement amount δ (cm) is simultaneously measured by the displacement meters D1 to D6 via the dynamic strain measuring device 34, subjected to data processing by the personal computer 35, and subjected to the load-displacement (P−
δ) Characteristics were obtained.

FIGS. 4 and 5 show a part of the obtained “load-displacement” graph, and FIG. 6 shows the results of obtaining the friction coefficient μ and the spring constant Δk from such a “load-displacement” graph. .
In FIG. 6, tests No. 1 to No. 3 show the case where the buffer unit described with reference to FIG. 12 is provided.

FIG. 7 shows the load-displacement (P-δ) predicted from the design horizontal spring constant Δk = 0.60 t and the design friction coefficient μ = 0.06 (loading load = 150 kg / cm ² at design load) at the time of shipment. ) Show characteristics. From the comparison between the expected load-displacement characteristics and the actually measured load-displacement characteristics, the following can be said as the result of this test.

(1) The apparent friction coefficient is μ = 0.07 to 0.07
5, which is slightly larger than the design value under the design load. The reason is that (a) the static friction coefficient is larger than the kinetic friction coefficient, and this effect is included in the apparent friction coefficient. b) The coefficient of friction depends on the surface pressure, and since there is almost no load during the test, it is considered that the coefficient of friction is larger than that at the time of the design load. A value.

(2) The apparent spring constant is slightly smaller than the design value. However, the decrease in the spring constant is due to the effect of increasing the period of the base-isolated floor to a longer period. It may be considered that it works favorably for the performance of. Therefore,
As a result, it can be said that it is satisfactory enough.

(3) In the comparison between the presence and absence of the buffer (for example, FIGS. 4 and 5), the effect of the presence of the buffer can be seen at the beginning of the deformation, but the effect as the load is at most 1 to 2t.
It can be said that extraction of the buffer is generally good.

(4) Among the actually measured load-displacement characteristics, in the process of restoring from the time of maximum deformation, it is considered that the gradient becomes small where the load is close to zero due to the effect of the inertia force due to the restoring force of the spring. .

(5) From the above (1) to (4), it can be judged that the present test has obtained sufficiently satisfactory results by the smooth loading, and it has been confirmed that the performance of the base-isolated floor is sufficient. It can be said that it was done.

In this way, it is possible to confirm the performance of an actually assembled seismic isolation floor system, and to perform a simulation without actually inputting seismic force. Further, an experiment can be performed even after loading of a computer or the like.

[0031]

As described above, according to the method or apparatus of the present invention, the following excellent effects can be obtained.

(1) The whole seismic isolation floor is statically moved laterally, and the relationship between the horizontal force P (ton) and the movement amount δ (cm) is grasped, and the friction coefficient and spring constant of the whole are determined. This makes it possible to confirm the performance of the actually constructed seismic isolation floor system . Especially after installation on the site, outside the seismic isolation floor
Considering that it is difficult to apply force from
Apply force at the internal position and after installation
To use as a reaction force receiver when applying force to
And the performance of the seismic isolation floor system can be
Even after assembling the seismic isolation floor in
Doo can (claim 1). Therefore, the simulation can be performed without actually inputting the seismic force. Further, an experiment can be performed even after loading of a computer or the like.

[0033] (2) In particular, in MenShinyuka Horizontal loading test apparatus according to claim 2 gives a horizontal pressure force MenShinyuka completing the field assembly of a plurality of hydraulic jacks, to tune these hydraulic jack Therefore, even for a base-isolated floor having a large floor area, the floor can be correctly and horizontally moved to obtain a graph of a desired horizontal force P (ton) and a movement amount δ (cm).

(3) According to the third or fourth aspect of the present invention, the seismic isolation floor can be restored to its original state by using a hydraulic jack for restoration or a separate-type double-acting hydraulic jack that can be shared for horizontal loading and restoration. Can be restored.

[Brief description of the drawings]

FIG. 1 is a diagram showing a basic configuration of a method for confirming the performance of a base-isolated floor system according to the present invention.

FIG. 2 is a diagram showing an arrangement relationship between a hydraulic jack and a displacement meter of the seismic isolation floor horizontal force test apparatus according to one embodiment of the present invention.

FIG. 3 is a diagram showing a configuration of a seismic isolation floor horizontal load test apparatus according to an embodiment of the present invention.

[Fig. 4] "Load-displacement" obtained from the measurement value of the test device
It is a figure showing the example of a graph.

FIG. 5 is a diagram showing an example of a “load-displacement” graph obtained from measurement values.

FIG. 6 is a diagram showing a result of obtaining a friction coefficient μ and a spring constant Δk from a “load-displacement” graph.

FIG. 7 is a diagram showing load-displacement (P-δ) characteristics expected at the time of shipping.

FIG. 8 is a diagram showing an outline of a conventional seismic isolation floor system.

FIG. 9 is a view showing a seismic isolation device constituting the seismic isolation floor system of FIG.

FIG. 10 is a sectional view showing the seismic isolation device of FIG. 9;

FIG. 11 is a top view showing the seismic isolation device of FIG. 9;

FIG. 12 is a view for explaining a conventional buffer around a base-isolated floor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Seismic isolation device 12 Horizontal spring 15 Sliding plate 22 Friction material 30 Pump unit 31 Hydraulic jack for load 32 Load cell 33 Displacement meter 34 Digital dynamic strain gauge 35 Personal computer 36 Hydraulic jack for restoration 37 Steel bracket 38 Control switch

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) G01M 19/00

Claims (4)

(57) [Claims] 1. Nearly the center of the base- isolated floor where field assembly has been completed
Between the seismic isolation floor and the reaction force receiver fixed to the existing structure.
A force applying means is provided between the existing structure and the reaction force receiver.
The seismic isolation floor is horizontally moved by the force means by applying a reaction force to the body, and the horizontal force and the amount of movement in the horizontal direction are measured by sensors, and the measured data is arithmetically processed to calculate the horizontal force. A method for confirming the performance of a base-isolated floor system, which graphs the relationship between the force and the amount of movement and calculates the overall friction coefficient and spring constant from the graph. 2. A substantially central portion of the base-isolated floor where field assembly has been completed.
A plurality of reaction force receiving members fixed to the seismic isolation floor and the existing structure at the position.
And installed between them, and the existing
A plurality of hydraulic jacks for applying a horizontal force to the seismic isolation floor by taking a reaction force on the installed structure, a pump unit for operating the hydraulic jacks in synchronization and moving the seismic isolation floor horizontally, And a displacement meter for measuring the amount of movement in the horizontal direction, and arithmetic processing means for collecting and calculating these measurement data and graphing the relationship between the horizontal force and the amount of movement. A seismic isolation floor horizontal force test device. 3. The seismic isolation floor horizontal force test device according to claim 2, wherein a restoring hydraulic jack and a pump unit thereof are provided in addition to the hydraulic jack. 4. The horizontal loading test of a seismic isolated floor according to claim 2, wherein a separate-type double-acting hydraulic jack is used as said hydraulic jack, and is also used as a hydraulic jack for horizontal loading and a restoring hydraulic jack. apparatus.