JP2011106217A - Operation control device for buckling restraining brace and structure using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an operation control device for a bucking restraining brace capable of releasing the buckling restraining brace from excessive stress loading while reducing the displacement of a building in response to an earthquake. <P>SOLUTION: This operation control device for a buckling restraining brace includes a main frame comprising a beam 4 and columns of a building, the buckling restraining braces 6 installed in the main frame, and a control mechanism 7 comprising at least a control hole 15 having the same length as the predetermined inter-layer deformation angle of the building relative to the longitudinal direction of the beam 4, and a pin 13 engaged with the control hole 15. The control mechanism 7 is attached to the beam 4 of the main frame and the buckling restraining braces 6, and operates the buckling restraining braces 6 when the pin 13 is moved to the end of the control hole 15. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to an operation control device for a buckling restrained brace that controls the operation of a buckling restrained brace corresponding to an interlayer deformation angle of a building, and a structure using the same.

  The general seismic safety of exterior materials in buildings is required not to cause direct damage due to damage to exterior materials such as obstruction of evacuation routes due to falling off of exterior materials, etc. In the case of small and medium-sized earthquakes with a high frequency of occurrence, it is required that the exterior material is not damaged or excessively deformed, and that the habitability and economy of the building are not impaired by the damage to the exterior material.

  In order to meet such seismic safety requirements, a buckling-restrained brace that reduces the response displacement of the building and absorbs energy during the earthquake is installed between the pillars and beams of the building. A pair of gussets that are fixed to each of the columns and beams of the object, and a buckling-restrained brace in which a brace plate is sandwiched between a pair of steel materials having a concrete layer on the inner surface, and the gussets are fixed to the columns and beams And a tongue that stands upright from the planar portion, the tongue is formed with a notch for receiving the brace plate, and the tip of the brace plate is inserted into the notch with the tongue. A joining structure of a column and a beam that welds the brace plate orthogonally to a cross shape is known (see Patent Document 1).

JP 2006-52612 A

  However, in the joint structure described in Patent Document 1, even if the buckling restraint brace sufficiently absorbs energy and reduces the response displacement of the building during a large earthquake, the buckling restraint brace is damaged, so There is a possibility that the exterior material attached with the restraining brace as a supporting material may directly cause damage.

In addition, during small and medium-sized earthquakes, the buckling restraint brace functions as an energy absorbing member from an interlayer deformation angle of about 1/1000, so the exterior material may be affected by excessive deformation due to damage of the buckling restraint brace. is there.
Here, the interlayer deformation angle is a value obtained by dividing the horizontal displacement of the building with respect to the time of the earthquake by the floor height.

  Therefore, an excessive stress load is applied to the buckling-restrained brace during both a large earthquake and a small-to-medium-scale earthquake, so that the exterior material is affected by the above-described damage caused by the buckling-restraining brace.

  The present invention has been made in view of the above problems, and reduces the seismic response displacement of a building and reduces the stress burden on the buckling restrained brace and the structure using the same. The purpose is to provide goods.

  In the buckling restraint brace operation control device of the present invention, one end of a buckling restraint brace is connected to a structure having a main frame composed of columns and beams, and the other end of the buckling restraint brace is connected to two members. It is characterized in that it is connected to one member of a control mechanism having a configuration that eliminates force transmission within a range of a predetermined relative distance, and the other member is connected to the structure (claim 1).

  For this reason, by the said control mechanism, two members will be in the range of relative distance at the time of a medium and small earthquake, a structure will not reach a fixed interlayer deformation angle, and there will be no transmission of force to a buckling restraint brace. That is, the stress burden which is a tension | pulling or a compression effect | action is eliminated by the buckling restraint brace. In the event of a large earthquake exceeding that, the transmission of force to the buckling restraint brace begins and the buckling restraint brace is activated. That is, the buckling restrained brace bears the layer shear force. This control mechanism serves to prevent the buckling restraint brace from operating until a predetermined interlayer deformation angle of the main frame. This reduces the response displacement of the structure and frees it from the excessive stress burden of the buckling restraint brace.

  Further, the control mechanism is characterized in that a control hole having an elongated hole is formed in one member, a pin is attached to the other member, and the two members are connected to each other through the control hole. .

  Furthermore, the distance that the pin in the control hole moves is a length corresponding to a predetermined interlayer deformation angle in the structure (claim 3).

  Furthermore, a pair of stoppers are provided on both movement direction lines of one member fixed to the buckling restraint brace (claim 4).

  As a result, one member fixed to the buckling-restraining brace moves and comes into contact with the stopper, and the attachment position of the stopper to the structure can be adjusted within a predetermined range of interlayer deformation. Become. Moreover, versatility can be improved by making adjustment of the length of a control hole unnecessary.

  A structure of a main frame composed of columns and beams, wherein the buckling-restraining brace provided on the main frame is interposed via the buckling-restraining brace operation control device according to any one of claims 1 to 4. It is provided between the beam of the main frame and a beam or a column (Claim 5).

  This eliminates the stress burden on buckling-restrained braces and medium- and small-scale earthquakes, and reduces the stress burden on exterior materials such as glass between buckling-restrained braces within the general design criteria. Damage can be avoided. In the event of a large earthquake, the buckling-restrained brace starts operating and acts to prevent damage to the structure.

As described above, according to the first aspect of the present invention, the operation control device for the buckling restraint brace includes the control mechanism for controlling the operation of the buckling restraint brace, so that the two members constituting the control mechanism can be provided at the time of a small and medium earthquake. Is within the range of the relative distance, and it is possible to eliminate the stress load which is a tension or compression action on the buckling restrained brace. In the event of a large earthquake that exceeds that, the transmission of force to the buckling-restrained brace begins, and the layer shear force is borne by the buckling-restraining brace. This control mechanism serves to prevent the buckling restraint brace from operating until a predetermined interlayer deformation angle of the main frame. Thereby, it is possible to release the excessive stress load of the buckling restraint brace.
According to the invention of claim 4, since one member fixed to the buckling restraint brace moves and hits the stopper, the position of the stopper attached to the structure is set within a desired interlayer deformation angle. It becomes possible to adjust. Moreover, versatility can be improved by making adjustment of the length of a control hole unnecessary.
Furthermore, according to the invention of claim 5, in order to eliminate the stress burden on the buckling restrained brace attached to the structure and prevent the damage in the case of a small-scale earthquake, the stress burden on the exterior material such as glass is prevented. can do. In addition, during a large earthquake, it is possible to prevent damage to the structure by operating the buckling restrained brace.

FIG. 1 is a configuration diagram showing an operation control device for a bending restraint brace. 2A and 2B are diagrams showing the configuration of the control mechanism, in which FIG. 2A is an exploded perspective view showing each part of the control mechanism, and FIG. 2B is a control when assembling each part shown in FIG. It is a block diagram of a mechanism. FIG. 3 is a front view of the operation control device for the bending restraint brace. FIG. 4 is a graph showing the layer shear force with respect to the interlayer deformation angle of the building. FIG. 5 shows the operation control device of the buckling restrained brace at each interlayer deformation angle, where (a) shows a state where no vibration is input, and (b) shows the interlayer deformation angle (δ1). The state is shown, and (c) shows the state of the interlayer deformation angle (δ2). FIG. 6 is an image diagram showing the operation state of the bending restraint brace operation control device at each interlayer deformation angle, where (a) shows a state where no vibration is input, and (b) shows an interlayer deformation angle (δ1). (C) shows the state of the interlayer deformation angle (δ2). FIG. 7 is a front view of the bending restraint brace operation control apparatus according to the second embodiment. FIG. 8 is a front view of the bending restraint brace operation control apparatus according to the third embodiment. FIG. 9 is a graph showing changes in load with respect to the displacement of the operation control device of the buckling restrained brace. FIG. 10 is a graph showing experimental results of a building to which a buckling-restrained brace is attached. (A) shows the shear force with respect to the interlayer deformation angle, and (b) is a buckling constraint at each level. It shows the plasticity rate of braces.

  Hereinafter, an operation control device for a buckling restrained brace of the present invention will be described with reference to the drawings.

  In FIG. 1, the example which attached | subjected the operation control apparatus 1 of the buckling restraint brace 6 to the building 2 is shown. The building (structure) 2 includes a main frame 5 including a group of columns 3 and a group of beams 4 orthogonally provided between the columns 3 and the columns 3 of the main frame 5. A number of buckling restrained braces 6 are provided on the beam 4. In this example, the buckling restraint brace 6 is attached to the lower beam 4 at one end and to the upper beam 4 via the control mechanism 7 described below at the other end. Although not shown in detail, a glass exterior material 8 is attached between the 6 groups of buckling restrained braces.

  The buckling-restrained brace 6 has a known structure, for example, a steel material used as a brace core material. Concrete (mortar) and concrete in which the brace core material is present except for connecting portions at both ends are used. It becomes the structure restrained by the steel material to enclose.

  2 and 3, the control mechanism 7 includes a sub-plate 10 interposed between the beam 4 of the main frame 5 and the buckling-restrained brace 6 and fixed below the beam 4 of the building 2. The center plate 12 is moved relative to the plate 10, and the pins 13 connect the plates 10 and 12.

  The sub-plate 10 includes a front surface portion 10a on the front side and a rear rear surface portion 10b, and a recess 11 is provided between the front surface portion 10a and the rear surface portion 10b. In addition, an elongated control hole 15 having a predetermined length l in the lateral direction is formed in the front surface portion 10a and the rear surface portion 10b of the sub plate 10.

  The center plate 12 is a rectangular plate-like member, has a predetermined thickness that can be inserted into the concave portion 11 of the sub-plate 10 and can slide, and an attachment hole 18 is formed at the center. The following pins 13 are inserted into When the center plate 12 is inserted into the recess 11, the mounting hole 18 is monitored in a control hole 15 formed in the sub plate 10. Further, two attachment plates 16 a and 16 b for coupling to the buckling restraining brace 6 are provided at two points on the front and back surfaces of the center plate 12 at the midpoint between the attachment hole 18 and the end portion, respectively.

  The pin 13 is a cylindrical member having the same diameter as the mounting hole 18, and after the center plate 12 is inserted into the recess 11 of the sub-plate 10, the pin 13 is fitted and fixed in the mounting hole 18. The sub plate 10 and the center plate 12 are connected and the relative positional relationship is restricted.

In the control mechanism 7 described above, first, the sub-plate 10 is fixed to the lower surface of the beam 4 of the building 2 by welding or the like. Then, when the center plate 12 is inserted into the recess 11 of the sub-plate 10, the mounting hole 18 is monitored in the control hole 15 of the sub-plate 10, and the pin 13 is inserted into the mounting hole 18 through the control hole 15. Fixed. Then, the lateral movement of the center plate 12 is restricted by the control hole 15. In other words, the lateral movement of the center plate 12 is obtained by subtracting the diameter A of the pin 13 from the length l of the center plate and is ½ the length. This lateral movement distance (1-A) / 2 corresponds to the interlayer deformation angle that determines the operation start point of the buckling restraint brace 6.
Finally, the connecting portion 6 a of the buckling restrained brace 6 is connected to the mounting plates 16 a and 16 b of the center plate 12.
The center plate 12 has a clearance (c) of at least about 2 mm between the center plate 12 and the beam 4 in order to prevent the lateral movement of the center plate 12 from being hindered.

The operation of the operation control device for the buckling restrained brace configured as described above will be described.
The interlayer deformation angles (δ1) and (δ2) shown below were defined as follows.
Interlayer deformation angle (δ1): Interlayer deformation angle at which the buckling-restrained brace begins to function, and was set assuming an interlayer deformation angle of 1/200.
Interlayer deformation angle (δ2): Interlayer deformation angle at which the buckling-restrained brace yields, and was set assuming an interlayer deformation angle of 1/100.

  Regarding the relationship between the interlayer deformation angle of the building 2 and the layer shear force, the first stage is the period until the building 2 reaches the interlayer deformation angle (δ1), and the building 2 exceeds the interlayer deformation angle (δ1) The time until the deformation angle (δ2) is reached will be described as the second stage, and the time when the deformation angle δ2 is exceeded will be described as the third stage.

(Interlayer deformation angle: about the first stage)
In the first stage shown in FIG. 4, depending on the earthquake resistance of the main frame 5, the buckling high-speed brace 6 does not bear the layer shear force. As shown in FIGS. 5A and 5B and FIGS. 6A and 6B, this is applied to the building 2 by operating the control mechanism 7 without operating the buckling restraint brace 6. This is because the stress is reduced.

(Interlayer deformation angle: about the second stage)
In the second stage shown in FIG. 4, the layer shear force (Qy) is shown when the layer shear force is gradually generated and the interlayer deformation angle reaches δ2. As shown in FIGS. 5 (c) and 6 (c), since the interlayer deformation angle δ1 at which the buckling restraint brace 6 is actuated is reached in the control mechanism 7, the buckling restraint brace 6 is actuated to build 2 This is to reduce the shear force of the building 2 as well as the layer shear force applied to the building 2.

(Interlayer deformation angle: about the third stage)
In the third stage shown in FIG. 4, the buckling restrained brace 6 yields. At this time, a shearing force is also applied to the main frame 5, and the layer shearing force shows a constant value (Qy).

FIG. 7 shows a second embodiment of the present invention.
In the first embodiment, when the buckling restraint brace 6 bears stress, the stress is transmitted by the pin 13. However, by providing the control mechanism 7 with a stopper, concentration of stress on the pin 13 can be avoided and the control mechanism can be avoided. 7 damage can be prevented.
In the following embodiments, the same portions as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  Specifically, as shown in FIG. 7, the stoppers 20 a and 20 b are provided on the beam 4 in pairs on both movement direction lines of the center plate 12. And it attaches so that it may have predetermined distance between the edge part of the center plate 12, and stopper 20a, 20b, and this predetermined distance D is the interlayer deformation which the buckling restraint brace 6 act | operates in the building 2 It is equivalent to a corner, and is equal to the lateral movement distance (1-A) / 2 of the pin 13 shown in the first embodiment.

  That is, when the buckling restraint brace 6 bears the stress, the stress is transmitted by the center plate 12 and the stoppers 20a and 20b, not by the pin 13 so that the control mechanism 7 is not damaged. Therefore, the control hole 15 functions as a guide hole for the pin 13 without setting its length l.

FIG. 8 shows a third embodiment of the present invention.
In the first and second embodiments, the control hole 15 is provided in the sub-plate 10 and the attachment hole 18 of the center plate 12 is provided to constitute the control mechanism 7. However, the control hole 15 ′ is provided in the center plate 12 and attached to the sub-plate 10. The present invention can be implemented even if the hole 18 ′ is provided.

  Specifically, as shown in FIG. 8, the control hole 15 ′ provided at the center of the center plate 12 and the mounting hole 18 ′ provided at the center of the sub-plate 10 are engaged by a pin 13. To do.

(Experimental example)
Static Loading Test A pair of buckling-restrained braces 6 of the buckling-restrained brace operation control device 1 according to Example 2 was fixed to the base, and then a load cell sensing shaft was attached to the tip of the beam 4. Then, assuming the roll of the earthquake, the load cell main body was reciprocally oscillated in the longitudinal direction of the beam 4 in a plurality of cycles by a hydraulic jack. In this vibration, the displacement-load curve according to Example 1 was obtained from the load acting on the load cell from the buckling restraint brace operation control device 1 and the displacement in the longitudinal direction of the beam 4.
The experiment was conducted with the interlayer deformation angle (δ1) being 1/150.

  As shown in FIG. 9, when the deformation reaches about 18 mm, the load of the load cell gradually increases. This can be considered in the same manner as in the first stage described above, indicating that no load is applied because the control mechanism 7 operates until the interlayer deformation angle δ1 is reached, and δ1 as in the second stage described above. This shows that the buckling restraint brace 6 is operating.

(Comparative example)
Assume that the building to be analyzed is a 13-layer steel office building. The analysis model is shown in Table 1.

  The stiffness and proof stress of the buckling restraint brace 6 are constant, and the interlayer deformation angle δ1 at which the buckling restraint brace 6 starts to function is used as a parameter. The interlayer deformation angle δ1 was 1/400, 1/300, 1/240, 1/200, and T400 type, T300 type, T240 type, and T200 type, respectively. These are collectively referred to as the T series. For comparison, the F type without the control mechanism 7 and the S type with only the main frame 5 were also analyzed.

As shown in FIG. 10A, when the T series and the F type were compared with respect to the degree of entry, no significant difference was found. However, as shown in FIG. 10B, when the plasticity ratio of the buckling restrained brace 6 was compared, it was reduced in most types of the T series compared to the F type. Therefore, the stress load on the buckling restrained brace 6 can be reduced by the buckling restrained brace operation control device 1.
In addition, in the plasticity rate in FIG.10 (b), it becomes a standard for the buckling restraint brace 6 to be damaged at the plasticity rate of 1.0. Therefore, most of the T series results in no damage to the buckling-restrained braces, and it is clear that the F type has damaged buckling-restrained braces at all levels.

  Next, when compared in the T series, it can be confirmed that the penetration degree of each layer is averaged in the T series. There is no significant difference in the degree of entry for each type. However, when comparing the plastic modulus of the buckling restrained brace 6, the plastic modulus decreases as the interlayer deformation angle increases. In particular, in the T200 type, the response is reduced while the buckling restraint brace 6 is kept within the elastic range.

  As described above, the response displacement of the building 2 is suppressed within the general design criteria of the exterior material 8 by appropriately setting the interlayer deformation angle in the control mechanism 7 of the operation control device 1 of the buckling restraint brace. Thus, it becomes possible to release the buckling restraint brace 6 from an excessive stress load and to avoid direct damage to the exterior material 8 which is a concern.

DESCRIPTION OF SYMBOLS 1 Operation control apparatus of buckling restraint brace 3 Column 4 Beam 5 Main frame 6 Buckling restraint brace 7 Control mechanism 8 Exterior material 10 Subplate 11 Recess 12 Center plate 13 Pin 15, 15 'Control hole 18, 18' Mounting hole 20a 20b Stopper

Claims (5)

  One end of a buckling-restraining brace is connected to a structure having a main frame composed of columns and beams, and the other end of the buckling-restraining brace is connected to transmit force within a range of a predetermined relative distance. An operation control device for a buckling-restrained brace, characterized in that it is connected to one member of a control mechanism having a structure to be eliminated and the other member is connected to the structure.   2. The seat according to claim 1, wherein the control mechanism includes a control hole having an elongated hole formed in one member, a pin attached to the other member, and the two members connected to each other through the control hole. Actuation control device for bending restraint brace.   The operation control device for a buckling restrained brace according to claim 2, wherein a distance traveled by the pin in the control hole is set to a length corresponding to a predetermined interlayer deformation angle in the structure.   3. The buckling restraint brace operation control device according to claim 1, wherein a pair of stoppers are provided on both movement direction lines of one member fixed to the buckling restraint brace.   A structure of a main frame composed of columns and beams, wherein the buckling-restraining brace provided on the main frame is interposed via the buckling-restraining brace operation control device according to any one of claims 1 to 4. A structure provided between a beam and a beam or a column of the main frame.

Images