JP2001041845A - Device for confirming displacement follow-up performance of construction secondary member, etc. - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simple and low-cost device by applying a relative displacement of a specified amount to vibration frames arranged in parallel using an agitator means which converts the rotation of a servo motor to a horizontal displacement, allowing agitation with a small force. SOLUTION: A test body 4 such as a construction secondary member is so attached as to span vibration frames 1 and 1' suspended from an external frame 2, and the vibration frames 1 and 1' are applied with a horizontal 2-dimension relative displacement by an agitator means which converts the rotation of a servo motor 3 to a horizontal displacement, for a displacement follow-up performance-confirming test. When a lower-side rotary disc 13 is rotated by the servo motor 3, an upper-side rotary disc 12 connected with a chain 17 makes a horizontal relative eccentric circular movement (crank action) with a support axis 18 as a crank pin. The vibration frames 1 and 1' which is, positioned on the rotary disc 12, suspended from the external frame 2 with a suspending material 6 by four corners generate a horizontal 2-dimension vibration which is indicated by an arrow 19 as a synthetic movement.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a secondary building member which is required to have a displacement follow-up performance with respect to a shaking of a building generated during an earthquake, particularly a shaking that causes a large deformation such as a seismic isolation structure. The present invention belongs to the technical field of a displacement follow-up performance confirmation device that can easily and simply confirm displacement follow-up performance at low cost for an expansion joint, a flexible joint of equipment piping, and the like.

[0002]

2. Description of the Related Art Conventionally, various types of vibrating devices used for testing vibration characteristics of structures have been developed. For example, a shaking table apparatus described in Utility Model Registration No. 20555214 (Japanese Utility Model Publication No. 6-22195) suspends a floating frame on a fixed frame, installs the shaking table on the floating frame, and vibrates the shaking table. A vibration exciter is provided, and a damper is connected between the fixed frame and the floating frame. A test body is placed on the vibrating table and vibrated to perform a test.

The vibration exciter described in Japanese Patent Application Laid-Open No. 10-263478 elastically suspends and supports a weight.
In this configuration, a vertical guide means for the weight is provided, and an air cylinder for vertically moving the weight via a coil spring connected to the weight is provided. This vibration exciter is installed on a structure, and vertically moves the weight to impart vertical vibration to the structure.

[0004] In addition, although no suspension mechanism is adopted,
Various types of vibrating devices for horizontally moving a shaking table are also known. However, all devices have a common structure in that an actuator that reciprocates linearly as an excitation source is used.

[0005] Next, as a displacement follow-up performance checking device for a secondary building member, a large-scale table vibration type vibration device using a linearly reciprocating actuator such as an air cylinder as a vibration source is known. is there. One end side of the building secondary member is fixed to the vibration device, the other end side is fixed to a frame that does not vibrate adjacent to the vibration device, and the table is vibrated so that the displacement following performance of the building secondary member is It is for confirming.

[0006]

However, according to the configuration of the conventional displacement follow-up performance checking device, the actuator which generates a large stroke necessary for checking (testing) the displacement performance of the secondary building member is not a single actuator. Large and expensive. In addition, since the operation of the actuator is a one-dimensional linear movement for a secondary building member that requires a displacement tracking performance test of two-dimensional motion, it is necessary to perform a displacement tracking performance test of two-dimensional motion. There is no other way than to change the direction of motion and perform the test. As a means to do so, it is necessary to prepare test specimens in each test direction as needed, which requires time and labor.

[0007] The displacement follow-up performance test of the secondary member of the seismic isolation structure does not require an actuator and a shaking table that generates a large output, but even if it is an over-functional facility, an appropriate alternative test apparatus is used. As a matter of fact, the fact is that the over-functional actuator and the vibration table must be used.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a performance confirmation apparatus capable of performing a confirmation test of the displacement follow-up performance of a secondary building member at a lower cost and more simply by using equipment having an appropriate function.

[0009]

Means for Solving the Problems As means for solving the above-mentioned problems, a displacement follow-up performance checking device for a secondary member of a building or the like according to the first aspect of the present invention comprises two horizontally-arranged parallel arrangements. A vibrating frame, an external frame for suspending and supporting each of the vibrating frames, a servo motor for applying a horizontal displacement to each of the vibrating frames, and a vibrating means including a mechanism for converting the rotation of the servo motor into a horizontal displacement; And a test piece such as a secondary building member is attached in an arrangement straddling the two vibration frames, and a constant magnitude relative displacement is given to the two vibration frames by the vibration means. .

According to a second aspect of the present invention, there is provided an apparatus for confirming displacement following performance of a secondary building member or the like according to the first aspect,
Each vibration frame is characterized in that it is suspended and supported by an external frame by a suspension member having a length adjusting mechanism.

According to a third aspect of the present invention, there is provided an apparatus for confirming displacement following performance of a secondary building member or the like according to the first aspect,
The vibrating means includes two upper and lower rotating disks horizontally arranged on the lower surface of the vibrating frame, and a vertical supporting the center of the lower rotating disk so as to be rotatable and fixedly supported on the center of rotation. A rotating shaft device, a servomotor for rotating the lower rotating disk, and a vertical fulcrum shaft connecting the upper and lower rotating disks at eccentric positions are arranged, and an excitation frame is provided on the upper rotating disk. The rotation of the lower rotating disk, which is attached and rotated at a fixed position by the servomotor, is given as the rotation of the upper rotating disk connected by the support shaft and further as the horizontal displacement of the vibration frame. .

According to a fourth aspect of the present invention, there is provided the apparatus for confirming displacement follow-up performance of a secondary building member or the like according to the first aspect,
A plurality of shaft holes are provided at a constant pitch at eccentric positions of the respective rotating disks, and a plurality of shaft holes are provided at predetermined positions at eccentric positions of the respective rotating disks. It is characterized in that it is connected through a shaft hole selected according to the magnitude of the quantity.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of a displacement follow-up performance confirming apparatus for a secondary member of a building or the like according to the present invention.

As shown in FIGS. 1 to 4, the basic structure of the vibration frame 1 is two vibration frames 1, which are horizontally arranged in parallel.
1 ', an external frame 2 for suspending and supporting each of the vibration frames, a servo motor 3 for applying horizontal vibration (displacement) to each of the vibration frames 1, 1', and a horizontal displacement for rotating the servo motor 3 And a vibrating means in combination with a mechanism for converting to.

As illustrated in FIGS. 2 and 3, a test piece 4 such as a secondary building member is mounted so as to straddle the two vibration frames 1 and 1 '. The displacement follow-up performance confirmation (test) is performed by giving a horizontal two-dimensional relative displacement of a certain magnitude to 1 '(the invention according to claim 1).

In the outer frame 2, the pillars 2a at the four corners are erected with their pillars firmly fixed to the concrete foundation 5 with anchor bolts or the like, and the outer beams 2b are erected between the top ends of the pillars 2a. And an inner beam 2c incorporated in the plane of the outer peripheral beam.
It has a strong frame structure that can withstand vibration during the test by incorporating Each column 2a, 2 of the outer frame 2
The interval between a and the vibration frame 1 at the time of excitation (during the test)
1 'and the outer frame 2 have such a size that there is no possibility of contact.

The four corners of each of the vibrating frames 1, 1 'are suspended and supported in a horizontal posture by a suspension member 6, such as a PC steel rod, suspended from the inner beam 2c (the invention according to claim 2). Details of the suspension structure are shown in FIG. As an example, a length adjusting mechanism 7 such as a turnbuckle is provided at an intermediate portion of the hanging member 6, and the upper hanging member 8 attached to the inner beam 2c and the lower hanging member 9 attached to the vibration frame and the hanging member 6 are arranged. ,
Each of them is connected by a so-called ball joint 11, and the external frame 2 and the vibrating frames 1, 1 'are vibrated (during a test).
It is configured to be able to cope with a deformation angle generated between the suspension member 6 and the suspension member 6.

Next, as shown in FIGS. 6 to 9, the vibrating means comprises a lower surface portion of each of the vibrating frames 1, 1 ', especially two vibrating frames arranged in parallel in the illustrated example. 1,
At the two corner positions (see FIG. 2) near the inner side in 1 ', the upper and lower rotating disks 12 and 13 are horizontally arranged.

That is, the lower rotating disk 13 is supported by the rotating shaft 14a of the rotating shaft device 14 whose center is vertical so as to be rotatable and the rotation center is immovably fixed.

That is, the base plate 14b of the rotary shaft device 14 is firmly fixed to the concrete foundation 5 by means such as an insert anchor. On the upper part of the vertical rotating shaft 14a supported by the rotating shaft device 14, the lower rotating disk 13 and the sprocket wheel 15 are attached to a concentrically arranged structure in which they respectively rotate integrally,
The sprocket wheel 15 is connected to a driving sprocket 3 a of the servomotor 3 by a chain 17.

In the case of the illustrated example, one servo motor 3 is provided for one vibration frame, and one servo motor 3 rotates two lower disks 13, 13 at a common speed in a common direction. ing. The rotation of the servo motor 3 is automatically controlled through a pulse transmitter not shown. The servo motor 3 is fixed to a concrete foundation 5. However,
Depending on the shape, weight, etc. of the test body 4, the upper and lower two rotating disks 12, 1
3 and four rotating shaft devices 1 on one vibration frame
In some cases, the servomotor 3 is used to vibrate by the rotation of two servomotors 3. Alternatively, when an excessive load is applied to one servomotor 3, the rotation shaft 14a may be driven by one servomotor 3 in some cases. In this case, the drive of each servomotor 3 is commonly controlled through the same control device (pulse transmitter).

The upper and lower rotating disks 12 and 13 are combined so as to be capable of relative horizontal displacement, and their eccentric positions are connected by a vertical fulcrum shaft 18, so that the two upper and lower rotating disks 1 and 13 are rotated.
2 and 13 are configured to perform horizontal relative eccentric circular motion (so-called crank motion) using the fulcrum shaft 18 as a crankpin. The vibration frame 1 or 1 ′ is mounted on the upper rotating disk 12. Accordingly, the rotation of the lower rotating disk 13 rotated at a fixed position by the servomotor 3 is controlled by the rotation of the upper rotating disk 1 connected by the fulcrum shaft 18.
As the eccentric circular rotation of 2, the vibration frame 1, which is further positioned on the upper rotating disk 12 and whose four corners are suspended and supported by the suspension members 6,
This is transmitted as a horizontal two-dimensional displacement of 1 '(the above is the invention according to claim 3).

Here, the relationship between the rotational circular motion of the upper and lower rotary disks 12, 13 and the horizontal displacement of the vibrating frames 1, 1 'will be described.

The lower rotating disk 1 is driven by the servomotor 3.
When 3 is rotated, the upper rotating disk 12 connected by the fulcrum shaft 17 performs a horizontal relative eccentric circular motion (so-called crank motion) using the fulcrum shaft 18 as a crankpin. The eccentric motion at this time is, as described in FIG.
This is a circular motion (two-dimensional motion) whose radius is the distance x between the center a and the fulcrum shaft 18. With the eccentric motion of the upper rotating disk 12, the respective vibration frames 1, 1 ′ which are located on the upper rotating disk 12 and whose four corner positions are hung on the outer frame 2 by the hanging members 6, Arrow circle 19 in FIG.
Performs the circular motion shown by, and generates horizontal two-dimensional vibration (displacement). The magnitude of the displacement at this time depends on the rotation shaft 14a.
And the distance x between the centers of the fulcrum shafts 18.

Therefore, the upper and lower two rotating disks 12 and 1
Shaft holes 20 and 21 through which the fulcrum shaft 18 vertically connects
As shown in FIGS. 8 and 9, each rotating disk 12, 1
A plurality (four in the illustrated example) is provided at a constant pitch at eccentric positions on the radius line 3 and the fulcrum shaft 18 is a shaft selected from the plurality of shaft holes according to the magnitude of the amount of displacement to be applied to the test body 4. It is implemented in a configuration in which it is connected through a hole.
Described invention).

Axial hole 2 provided in upper and lower rotating disks 12 and 13
0 and 21 are concentrically arranged vertically. The shaft hole 21 of the lower rotating disk 13 is provided with a bolt 1 used for a fulcrum shaft.
8 is formed as a screw hole into which the screw 8 is screwed, and the shaft hole 20 of the upper rotating disk 12 is formed as a loose hole having a diameter considerably larger than the screw outer diameter of the bolt 18 serving as the fulcrum shaft. A necessary and sufficient motion gap S1 is secured. Also, a necessary and sufficient movement gap S2 is secured between the head 18a of the bolt 18 used for the fulcrum shaft and the upper surface of the upper rotating disk 12. The above-mentioned motion gaps S1 and S2 realize smooth motion by preventing the above-mentioned eccentric circular motion of the upper rotating disk 12 and the accompanying vertical movement of the vibrating frames 1 and 1 ′ and the catch during operation. Is important above.

In FIG. 2, the two vibration frames 1 and 1 'arranged in parallel have their horizontal two-dimensional vibrations (eccentric circular motion) always point-symmetric with respect to a fixed point P obtained at the center position between them. The rotation of each of the servomotors 3 is controlled in the same direction and at the same speed so as to be at the position. As a result, the relative displacement between the two vibrating frames 1 and 1 ′ has a maximum value in an arbitrary direction, and specifically, is four times the distance x between the centers. Then, in one rotation movement, it is possible to give the maximum displacement in any direction assumed during the earthquake. For example, when it is desired to apply the maximum displacement a to the test body 4, the center distance x is set to a / 4.

When a test for confirming the displacement following performance of a secondary building member is performed by using this apparatus, first, the length adjusting mechanism 7 of the hanging member 6 is operated, and the effective hanging length H (see FIG. 5) Adjust properly. Thereafter, the two vibrating frames 1 and 1 ′ are fixed using a jack or the like at a relevant position where a point symmetry fixed point P is established. Vibrating frame 1,
Attach it in an arrangement across 1 '(see FIGS. 2 and 4). The illustrated test body 4 is an example of a pipe connected by a flexible joint. It is convenient to equip the vibration frames 1 and 1 'with a pipe support 22, a fixture 23 and other attachment members as needed (FIGS. 2 and 3). The center distance x between the rotating shaft 14a and the fulcrum shaft 18 is set in accordance with the maximum displacement a to be applied to the test body 4. Thereafter, the servomotor 3 is started to perform a test for confirming displacement following performance by excitation. Will do.

The movement (vibration displacement) at the installation site of the test body 4 (secondary building member) generated during the earthquake is as follows:
If two points M and N arbitrarily determined on the test body 4 are captured, a model can be formed as shown in FIG. 10A. Assuming that the maximum horizontal displacement in each direction at the installation site of the building secondary member is Z, each site is centered on the positions M and N before the earthquake, and circles E1 and E2 whose radius is the displacement Z (FIG. 10B).
). Therefore, the relative displacement amount of each part to which the secondary member is attached is determined by two points M1 and N1 (see FIG. 10) in two circles E1 and E2 having the displacement Z as a radius.
B). The length of the straight line in the arbitrary direction passes through a midpoint P on a line connecting the centers of the two circles E1 and E2, and becomes maximum when connecting two points M2 and N2 on each circumference (FIG. 10C). ). Midpoint P in FIG. 10C
And the fixed point P in FIG. 2 is a common point.

That is, in FIG. 2, when the building secondary member as the test body 4 is mounted with the relative displacement between the two vibration frames 1, 1 'being the minimum value, the two vibration frames 1, 1 ′ is always at a point-symmetric position with respect to the fixed point P, and the relative displacement of each of the vibrating frames 1 and 1 ′ becomes the maximum value in an arbitrary direction, and gives the maximum displacement expected to the specimen 4. Can be.

[0031]

[Effects of the present invention] In the displacement follow-up performance checking device for a secondary member of a building or the like according to the first to fourth aspects of the present invention, since a suspension mechanism is used for the vibrating frame, it is possible to excite with a small force. In addition, a simple and low-cost device can be provided by using a servomotor as a vibration source.

[0032] By giving two vibration frames a rotary motion having a radius that is a fraction of the amplitude (displacement) during the earthquake,
It is possible to give an assumed maximum displacement in an arbitrary direction (secondary source direction) in one rotation, thereby saving labor and shortening the test.

As described above, the displacement follow-up performance of the building secondary member and the like can be easily and easily confirmed, so that it is possible to provide a high quality secondary member and thereby contribute to the improvement of the quality of the building.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of a displacement tracking performance confirmation device according to the present invention.

FIG. 2 is a plan view of the same device with an external frame omitted.

FIG. 3 is an elevation (front) view of the apparatus.

FIG. 4 is a side view of the same device.

FIG. 5 is a detailed view of a hanging member.

FIG. 6 is a plan view of a vibrating means of the apparatus.

FIG. 7 is an elevational view of the same vibration means.

FIG. 8 is a cross-sectional view taken along the line-of FIG. 6;

FIG. 9 is an enlarged detailed view of a portion supported by FIG. 8;

FIG. 10A is an explanatory diagram in which the movement at the mounting portion of the specimen is captured at any two points M and N defined on the specimen, and B is the relative displacement amount of the specimen in two circles E1, E2
Figure showing the length connecting two points M1 and N1 in C.
FIG. 4 is a diagram showing the length of the maximum displacement amount.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 1 'Vibration frame 2 External frame 6 Suspension material 3 Servo motor 4 Specimen 7 Length adjustment mechanism 12 Rotating disk 13 Rotating disk 14 Rotating shaft device 18 Support shaft (bolt) 20 Shaft hole 21 Shaft hole

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kozo Kawada 1-5-1, Otsuka, Inzai City, Chiba Pref. Inside the Research Institute of Takenaka Corporation (72) Inventor Takeshi Kanbe 4-4-1 Odori Nishi, Chuo-ku, Sapporo City Takenaka Corporation Hokkaido Branch

Claims (4)

[Claims] 1. Two vibration frames arranged horizontally in parallel, an external frame for suspending and supporting each of the vibration frames, a servo motor for giving a horizontal displacement to each of the vibration frames, and a rotation of the servo motor. And a vibrating means comprising a mechanism for converting to horizontal displacement, and a test body such as a secondary building member is attached in a position straddling the two vibrating frames, and is fixed to the two vibrating frames by the vibrating means. A displacement follow-up performance confirmation device for a secondary building member or the like, wherein a relative displacement amount is given. 2. The displacement follow-up performance of a secondary building member or the like according to claim 1, wherein each vibration frame is suspended and supported on an external frame by a suspension member having a length adjusting mechanism. Confirmation device. 3. The vibrating means includes two upper and lower rotating disks horizontally arranged on the lower surface of the vibration frame, and a center portion of the lower rotating disk rotatably fixed on the basis of the center of rotation. A vertical rotating shaft device for supporting the rotating disk, a servomotor for rotating the lower rotating disk, and a vertical fulcrum shaft connecting the upper and lower rotating disks at an eccentric position. The rotation of the lower rotating disk rotated at a fixed position by the servomotor is given as the rotation of the upper rotating disk connected by the support shaft, and further as the horizontal displacement of the vibration frame. The displacement follow-up performance confirmation device for a secondary building member or the like according to claim 1, wherein: 4. A plurality of shaft holes through which support shafts for vertically connecting two upper and lower rotating disks are provided at a constant pitch at eccentric positions of the respective rotating disks, wherein the support shaft is one of the plurality of shaft holes. The displacement follow-up performance confirmation device for a secondary building member or the like according to claim 1, wherein the device is connected to a shaft hole selected according to the magnitude of a displacement amount given to the test body.