JP2001264001A - Deformation recording apparatus for inter-structural member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a deformation recording apparatus, capable of directly measuring a distance between two points, which are generated between members of structural objects and which has a simple structure and high reliability. SOLUTION: When a force in the compressive direction in member X and member Y are acted, a right end section 33 of a rod having a scale advances to into the interior of a cylindrical rod 2 by the amount of length with which it was pushed. Even if a force is acted in the direction of pulling between the other member between the X and Y members the rod 30 with a scale will not move, since it is constrained in inside surface of a wedge 24 by friction force. Additionally, even if the members X and Y act in the direction in-between the members A and Y and when the force is smaller than the previous compressive force it has received, the right and section 33 of the rod having a scale 30, it will not be pushed against the member Y.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for recording a relative deformation generated between members of a structure when a disturbance such as an earthquake is input, and more specifically, an apparatus for recording a maximum deformation between the members and a cumulative deformation recording. The present invention relates to a device and a residual deformation recording device.

[0002]

2. Description of the Related Art Conventionally, the response deformation of a building during an earthquake has been obtained by time-integrating an acceleration record electrically measured by a strong seismograph with a computer. However, this method assumes a certain earthquake model,
Since calculation is performed based on this, an error naturally occurs between the building and the actual building, which is not preferable in terms of accuracy. It is also conceivable to install an electric displacement gauge between the members, but it is necessary to integrate the measured displacement in order to know the cumulative deformation. Furthermore, since these electric measuring instruments need to be constantly monitored, there are drawbacks that running costs are high and maintenance work becomes complicated when used for a long time. Also, the reliability of these electrical measuring instruments, particularly the operation guarantee during an earthquake, cannot be said to be high.

On the other hand, Japanese Patent Application Laid-Open No. H11-325802 discloses that a pantograph type horizontal displacement magnifying means is provided between an upper part and a lower part of a shear-type steel damper attached to a structure, and a ratchet gear is used for one-way displacement of the magnifying means. An apparatus for measuring the amount of cumulative deformation, which determines deterioration of a damper by measuring through a device, is disclosed. Since the measuring device is a mechanical measuring device, the above-mentioned drawbacks of the electric measuring device are eliminated, but a complicated structure using a link mechanism and a linear / rotation conversion mechanism using a ratchet is used. It has become.

[0004]

SUMMARY OF THE INVENTION The present invention relates to a simple and highly reliable structural member which can directly measure relative deformation generated between structural members as a displacement length between two points. It is an object of the present invention to provide a modification recording device.

[0005]

According to the present invention, there is provided an apparatus for recording maximum deformation between structural members according to the present invention. And one end of the scale is fixed to the one member, and the other end of the scale is brought into contact with the other member. The scale is composed of two members, a rod having a reference point and a graduated rod, and it is preferable that both members slide by a compressive force but not by a tensile force. The cumulative deformation recording device according to the present invention includes, in series, a scale that shortens in the compression direction but has a constant length in the tensile direction, and a scale that does not change in length in the compression direction but expands in the tensile direction. It is characterized in that both ends of this connecting scale are connected between members of a structure whose deformation is to be recorded. The scale preferably has play means for canceling the elastic deformation of the member. The residual deformation recording apparatus according to the present invention includes a scale that shortens in the compression direction but has a constant length in the tensile direction, and a scale that does not change in length in the compression direction but expands in the tensile direction. It is characterized in that both ends of this connecting scale are connected between members of a structure whose deformation is to be recorded. Each scale constituting the connection scale of the cumulative deformation recording device or the residual deformation recording device is composed of two members, a rod having a reference point and a graduated rod, and the scales are connected by sharing the graduated rod. Is preferable.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. First, the maximum deformation recording device of the present invention will be described.

FIG. 1 shows a member X (for example, a building frame) and a member Y (for example, a stud) of a structure whose deformation is to be recorded.
In the middle, a state where the scale 10 of the present invention is installed is shown. The scale 10 is composed of two members, a cylindrical rod 20 having a reference point 21 and a rod 30 with a scale 31.
The cylindrical rod 20 has a steel tube 22, a tapered steel tube 23, and a plurality of wedges 24 divided in the steel tube 23 as main components. The steel tube 22 and the steel tube 23 are engaged with each other by screws 25, and the steel tube 23 A coil spring 2 for urging a wedge 24 against a steel pipe 22 and a graduated rod 30
Contains 6

The end 27 of the cylindrical rod 20 is fixed to the member X via a pin 28 screwed to the left end of the steel pipe 22. On the other hand, the graduated rod 30 is partially inserted into the cylindrical rod 20, and the right end 33 protruding from the graduated rod 30 is in contact with the member Y. The surface of the graduated rod 30 is rough, and a frictional force acts between the graduated rod 30 and the inner surface of the wedge 24 disposed around the rod. Thus, the scale 10 shortens in the compression direction but remains unchanged in length in the tension separation direction.

In the above apparatus, when a force in the compression direction acts between the members X and Y, the right end 3
3 is pushed by the member Y, and the same rod 3 is pushed by the pushed length.
0 goes into the inside of the cylindrical rod 20. On the other hand, member X,
Even if a tensile force acts between Y, the graduated rod 30 does not move because it is restrained by the frictional force on the inner surface of the surrounding wedge 24. Even if a compressive force acts between the members X and Y, if the compressive force received in the past is smaller than the force applied in the past, the right end 33 of the graduated rod 30 is not pushed by the member Y. Therefore, the maximum deformation between the members X and Y is recorded as the extension length of the graduated rod 30. The maximum deformation length is directly measured by reading the scale 31 of the graduated rod 30 from the reference point 21 of the cylindrical rod 20.

Next, the cumulative deformation recording apparatus of the present invention will be described with reference to FIG. In FIG. 2, the scale 10 described above is provided between the member X and the member Y of the structure whose deformation is to be recorded.
The scale 40 made of the same component is connected in series with the scaled rod 30 as a common member. The scale 40 has a wedge 24 and a scale 1
Since it is oriented in the same direction as 0 and the graduated rod 30 is located between the scales, the scale 40 extends in the tensile direction and does not change in the compressive direction. The end 36 on the scale 40 side is pin-joined to the member Y via a pin 35 screwed to the right end of the cylindrical rod 20, and the end 2 on the scale 10 side.
7 is pin-joined to the member X via the pin 28 as described above.

FIG. 3 shows a method of measuring the cumulative deformation by the above apparatus.
This will be described below. 3 (1) shows the installation location of the cumulative deformation recording device, in which a scale 10 and a scale 40 are connected and fixed between a column X and a stud Y standing between floor slabs 38 and 39. In the right diagram of FIG. 3A, reference numerals 21 and 41 are reference points provided on the cylindrical rods 20 of the scales 10 and 40. FIG. 3A shows an initial state before a disturbance input. I have.

Next, as shown in the left diagram of FIG. 3 (2), when the floor slab 38 moves relative to the floor slab 39 rightward by the length a, the scale 40 is moved to the scale 40 as shown in the right diagram. Since the force in the pulling direction acts, the scale 40 extends by the length a, and the graduated rod 30 moves to the left from the reference point 41 of the scale 40 by the length a. At this time, since only a tensile force acts on the scale 10, its length is unchanged.

Next, as shown in the left diagram of FIG. 3 (3), when the deformation of the length a returns to the original state and the deformation of the length b occurs further to the left, that is, the floor slab 38 is If the scale 39 is moved to the left relative to the length a + b, only the force in the compression direction acts on the scale 40, so that the length is unchanged. On the other hand, the scale 10 is shortened by the length a + b by the action of the compressive force. Accordingly, the scaled rod 30 has a length a to the left from the reference point 21 of the scale 10.
Move by + b.

The cumulative deformation of the structure so far due to the external force is obtained by reading the scale 31 of the scaled rod 30 from both the reference points 21 and 41, and calculating the sum a + (a +
b) = 2a + b. Therefore, even when a repeated alternating load such as seismic force is applied, the cumulative deformation is recorded as the sum of the two. Further, the residual deformation amount of the structure is measured as the difference (a + b) −a = b between the two by using the same deformation recording device.

Since the elastic deformation of the measuring member subjected to the external force does not affect the yield of the member,
When the present cumulative deformation recording device is applied to an energy absorbing member such as a damper, it is preferable not to measure the elastic deformation. In such a case, a play means for canceling the amount of elastic deformation from the accumulated deformation amount is provided on the scale 10.
May be provided. In the residual deformation recording device, such a play means may be provided. In this case, the plastic deformation is recorded as the residual deformation amount. FIG. 4 shows the play means 50 provided on the pin 28 of the scale 10 shown in FIG. FIG. 4A is a plan view, and FIG. 4B is a vertical sectional side view taken along the line II-II of FIG. The play means 50 comprises a pin 52
The pin 53 is slidably inserted therein, and a projection 53 implanted on the outer surface of the pin 28 projects from a long hole 54 penetrating through the inner and outer surfaces of the pipe 52. Since the pin 28 is slidable in the pipe 52 by a distance L in the long diameter direction of the long hole 54, the distance L = 2 × (the amount of elastic deformation of the member)
By doing so, the amount of cumulative plastic deformation can be directly obtained. The play means 50 can be installed not only on the pin 28 but also on the steel pipe 22 or the pin 35 or the like.

FIG. 5 is a sectional view showing a modification of the scale 10. As shown in FIG. This scale 60 is formed by inserting the distal end 62 of the graduated rod 30 into the opening 61 of the cylindrical rod 20 and forming the width of the cylindrical rod 20 in a tapered shape toward the opening 61. Also, the width of the distal end portion 62 of the graduated rod 30 is widened to form a tapered shape that becomes narrower toward the rear, and the intermediate portion is provided in the gap between the cylindrical rod 20 and the distal end portion of the graduated rod 30. Member 6
., And the inner surface of the cylindrical rod 20 and the outer surface of the graduated rod 30 are connected to intermediate members 63, 63,.
.. having an intermediate member 6
, 63... Have a width dimension tapered toward the opening 61 of the cylindrical rod 20, and a compression spring 64.
Are biased so as to press the intermediate members 63, 63... Toward the opening 61 of the cylindrical rod 20.

While the scale 10 and the scale 40 resist in the tension direction or the compression direction only by the frictional force, the scale 60 shown in FIG.
A taper is provided at the distal end of the cylindrical rod 20 to lock the cylindrical rod 20. In any case, the scale of the present invention is:
It is sufficient if the length in the compression direction is invariable but the length is invariable in the compression direction, but the length is invariable in the tension direction, but the length is invariable in the compression direction.

[0018]

According to the first and second aspects of the present invention, the relative deformation generated between the members of the structure can be directly measured as the displacement length between two points, and the reliability is reduced with a simple structure. Is also expensive. Therefore, the present apparatus is extremely effective as an index for measuring the degree of damage of a member. According to the third, fifth, and sixth aspects of the invention, the amount of cumulative deformation or the amount of residual deformation generated between members of the structure can be directly measured, and the reliability is high with a simple structure. Therefore, it is very effective in measuring the amount of cumulative deformation or residual deformation experienced by an energy absorbing member such as a damper or a boundary S beam of a parallel shear wall. According to the invention as set forth in claim 4, since the amount of cumulative plastic deformation occurring between members of the structure can be obtained, if the invention is applied to an energy absorbing member such as a damper, the replacement time of the member can be immediately determined at the place where the member is installed. Can be determined.

[Brief description of the drawings]

FIG. 1 is a sectional view of a maximum deformation recording device.

FIG. 2 is a sectional view of a cumulative deformation recording device and a residual deformation recording device.

FIG. 3 is an explanatory diagram of a method of measuring cumulative deformation by the above device.

FIG. 4 is a plan view of the play means 50 (FIG. 4 (1)) and a vertical sectional side view taken along the line II-II of FIG. 4 (FIG. 4 (2)).

FIG. 5 is a sectional view of a scale 60 as a modification.

[Explanation of symbols]

 10, 40, 60 Scale 21, 41 Reference point 20 Cylindrical rod 30 Scaled rod 50 Play means X, Y Structure member

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Kanji Fukushima 2-1 Tsukudo-cho, Shinjuku-ku, Tokyo Kumagaya Gumi Tokyo Head Office F-term (reference) 2F061 AA01 AA26 CC07 DD22 DD27 GG05 GG36 HH02 JJ03 JJ11 JJ19 JJ63 LL13 LL25 LL57 LL58 VV09 VV29 VV38 VV48

Claims (6)

[Claims] 1. A scale, which is shortened in the compression direction but invariable in the tension direction, is interposed between members of a structure in which deformation is to be recorded, and one end of the scale is fixed to the one member, A maximum deformation recording device between structural members formed by bringing the other end of the scale into contact with the other member. 2. The maximum deformation recording apparatus according to claim 1, wherein said scale comprises two members, a rod having a reference point and a graduated rod, wherein both members slide by a compressive force but do not slide by a tensile force. 3. A scale, which is shortened in the compression direction but invariable in the tension direction, and a scale which is invariable in the compression direction but extends in the tension direction, are connected in series,
An apparatus for recording cumulative deformation between structural members in which both ends of the connection scale are connected between members of a structure in which deformation is to be recorded. 4. The cumulative deformation recording apparatus according to claim 3, wherein said scale has a play means for canceling an elastic deformation of the member. 5. A scale that is shortened in the compression direction but invariable in the tension direction and a scale that is invariable in the compression direction but extends in the tension direction is connected in series,
An apparatus for recording a residual deformation between structural members in which both ends of the connection scale are connected between members of a structure in which deformation is to be recorded. 6. A scale according to claim 3, wherein each of said scales comprises a rod having a reference point and a scaled rod, and said scales are connected by sharing said scaled rod. The deformation recording device according to claim 5.