JP2016130405A - Energy absorption-type bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an energy absorption-type bearing that offers high initial rigidity and control at will of yield strength, and is expected to realize a desired energy absorption effect even when a vertical load from a roof frame fluctuated greatly at a time of earthquake or the like.SOLUTION: An energy absorption-type bearing 10 connects a bearing frame BF with a roof frame RF, is provided with a cutout part 3, and includes a base plate 1 supporting weight of the roof frame RF, a friction resistance plate 4 housed in the cutout part 3 and having a larger friction resistance compared to the base plate 1 with regard to the bearing frame; a first anchor member 6 inserted into a first hole 2 of the base plate 1 for connecting the base plate 1 with the bearing frame BF; and a second anchor member 7 inserted into a second hole 5 of the friction resistance plate 4 for connecting the friction resistance plate 4 with the bearing frame BF. An axial force adjustment member 8 is fitted on a second anchor member 7, and the friction resistance plate 4 is pressed against the bearing frame BF with prescribed compression force Q, through the axial force adjustment member.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an energy-absorbing support that connects an RC or SRC support frame and an S-structure roof frame supported by the support frame.

  In the Great East Japan Earthquake that occurred in 2011, there were many damages such as damage to the support section of the S structure roof frame and the RC structure that supported the gymnasium. When seismic waves are input to the support frame, an excessive out-of-plane response occurs in the support frame in a direction where the horizontal rigidity is low. As a result of this out-of-plane response being propagated to the roof frame, an alternating load is applied to the support section. One of the reasons is that I was deceived by

  Public facilities with a large capacity, such as gymnasiums, play an important role as evacuation facilities for natural disasters such as typhoons and earth and sand disasters, in addition to the original function of indoor exercise areas. . Therefore, it is extremely important to continue the role and function as an evacuation facility during the recovery and reconstruction period of the local infrastructure and damaged houses after a natural disaster without being damaged during a natural disaster.

  Currently, research is being conducted to reduce the response during earthquakes by using an elasto-plastic type energy absorbing bearing for RC cantilever frame bearings such as gymnasium roofs. In this technology, the initial stiffness of the bearing is increased, and a higher response reduction effect is expected when the yield strength is in a limited range. Therefore, the initial stiffness is high, and the elastoplastic energy absorption type that can freely control the yield strength. Bearing development is desired in the art.

  Here, turning to the public technology, Patent Document 1 has a function of allowing relative horizontal displacement between the roof frame and the support structure and a function of generating a damping force at the time of relative horizontal displacement. A seismic isolation device is installed, causing at least a certain amount of relative displacement between the roof frame and the support structure in the direction where the horizontal rigidity of the support structure is low, and the roof frame and the support structure in a direction where the horizontal rigidity is high. A seismic isolation structure is disclosed in which a horizontal force is applied to the seismic isolation device and a damping force is generated while allowing relative displacement between them. In this seismic isolation structure, a steel rod damper or a curved steel plate damper is applied as an energy absorbing material.

  According to the seismic isolation structure disclosed in Patent Document 1, it is possible to reduce the transmission of the horizontal force in the direction of low horizontal rigidity input to the support structure to the roof frame and to avoid forced deformation to the roof frame. It is said.

  However, the rigidity and proof stress of a steel rod damper or a curved steel plate damper applied as an energy absorbing material are closely related to the shape of the damper. Therefore, it is extremely difficult to freely control the yield strength under the above-described problem, that is, the condition that the initial rigidity is high.

  Further, Patent Document 2 discloses a sliding support composed of a sliding material in which a polyamide resin containing a filler is inserted into a holding plate and a coated sliding plate.

  According to the sliding bearing disclosed in Patent Document 2, the friction coefficient can be controlled within the optimum range, and the earthquake resistance is improved.

  By the way, the above-mentioned sliding bearing generates a frictional force by the vertical load shared by the bearing and absorbs seismic energy by this frictional force. For example, the sliding bearing is loaded on the sliding bearing, for example, by a roof frame such as a gymnasium. Since the vertical load varies greatly depending on the seismic response, it is difficult to stably absorb the seismic energy by generating a stable friction force during an earthquake, and there is a big difference between the design value and the actual energy absorption performance. Is considered to exist.

JP 2005-344508 A JP 2006-161840 A

  The present invention has been made in view of the above-mentioned problems, and enables high initial rigidity and free control of yield strength, and also when the vertical load from the roof frame greatly fluctuates during an earthquake or the like. An object of the present invention is to provide an energy absorption type bearing that can be expected to have a desired energy absorption effect.

  In order to achieve the above object, an energy absorbing bearing according to the present invention is an energy absorbing bearing that connects an RC or SRC support frame and an S roof structure supported by the support frame. A base plate provided with a notch and connected to the roof frame to support the weight of the roof frame; and a friction resistance plate accommodated in the notch and having a large frictional resistance between the support frame and the base plate; A first anchor member inserted through a first hole formed in the base plate to connect the base plate and the support frame, and a second hole formed in the friction resistance plate to be inserted and supported by the friction resistance plate. A second anchor member that connects the frame, and an axial force adjusting member is attached to the second anchor member, and the friction resistance plate is supported by the axial force adjusting member. Those that are suppressed by predetermined compression force against.

  The energy absorption type support of the present invention has a base plate that supports the weight of the roof frame connected to the roof frame, and a friction resistance plate that expects a friction resistance force between the support frame. An axial force adjusting member is attached to the anchor member of the frictional resistance plate that is expected to have a frictional resistance force, and is fixed to the supporting frame via a unique anchor member, and the frictional resistance plate is compressed against the supporting frame by this axial force adjusting member. The force can be controlled freely. Here, RC construction means reinforced concrete construction, SRC construction means steel reinforced concrete construction, S construction means steel construction, and S construction roof frames are made of steel, metal, etc. A roof is constructed by laying sheet materials and sheet materials of various materials. Further, examples of the structure to which the energy absorption type support of the present invention having these structures is installed include a gymnasium as described above, a library, a public building of a local government, various amusement facilities, and the like.

  According to the above-described configuration of the energy absorption type bearing of the present invention, since the vertical load due to the roof frame that varies greatly during an earthquake is not considered as a compressive force for the frictional resistance, a constant frictional resistance during an actual earthquake or the like. It is possible to expect power.

  In addition, by adjusting the compression force of the frictional resistance plate against the support frame with an axial force adjusting member as desired, an energy absorption type bearing capable of freely controlling high initial rigidity and yield strength is obtained. In addition, since the elastic behavior with high initial rigidity and the plastic behavior that absorbs energy by moving horizontally while exhibiting friction resistance after the yield strength, the energy absorption type bearing of the present invention is Also, it can be referred to as an elastoplastic damper or a rigid plastic damper having a high initial rigidity.

  The energy absorption type support of the present invention has a structure in which, for example, a notch is provided in a steel base plate and a steel friction resistance plate is accommodated in the notch.

  When an out-of-plane response occurs to an energy-absorbing bearing during an earthquake, the base plate that supports the weight of the roof frame and the frictional resistance plate housed in the notch both respond to the vibration of the support frame. Vibrate. At this time, the energy absorption type bearing has only a slight horizontal movement in the so-called elastic region up to the yield strength of the frictional resistance, and in the so-called plastic region after the yield strength, the frictional resistance plate moves horizontally while generating a dynamic frictional force. In addition, the base plate accommodated in the notch in a state where the frictional resistance plate is cut off is also horizontally moved in response to the horizontal movement of the frictional resistance plate. That is, in the energy absorption type support composed of the base plate and the friction resistance plate which are cut off, the entire support behaves integrally from the elastic region to the plastic region.

  Here, a disc spring, a coil spring, or the like can be applied to the axial force adjusting member. By applying these members, it is possible to manufacture a high-performance energy absorbing bearing at a relatively inexpensive member cost. become.

  Further, in a preferred embodiment of the energy absorption type support according to the present invention, the energy absorption type support is formed in a state where the side surface of the notch of the base plate and the side surface of the friction resistance plate are in contact with each other, and the space between the base plate and the support frame is formed. In this case, a frictional resistance reducing layer is interposed.

  The energy-absorbing bearing is configured with the notch side of the base plate and the side surface of the frictional resistance plate in contact with each other (when both plates are made of steel, they are in metal touch). Dynamic behavior can be assured with higher accuracy.

  Further, by interposing the frictional resistance reducing layer between the base plate and the support frame, the base plate that varies the yield strength can be made slippery in the event of an earthquake or the like. As a result, the fluctuation of the weight received from the roof frame in the event of an earthquake, etc. is severe, and the frictional resistance exerted by the energy absorption type bearings eliminates the entry of unstable frictional resistance elements due to heavy weight fluctuations. Therefore, it is possible to stably exhibit a certain frictional resistance against the energy absorption type support.

  In a preferred embodiment of the energy absorption type support according to the present invention, the first hole and the second hole are both long holes, and the base plate and the friction resistance plate are horizontally movable in the longitudinal direction of the long holes. The energy absorbing support is attached to the support frame such that the longitudinal direction of the first and second long holes is oriented in a direction perpendicular to the surface of the support frame.

  Since the structural direction of the support frame is high in horizontal rigidity, there is no horizontal movement of the base plate and the frictional resistance plate, and the energy absorption type support is structurally a pin support with respect to the support structure. On the other hand, since the horizontal rigidity is low in the direction perpendicular to the plane of the support frame, only a slight horizontal movement to the yield strength occurs in this direction due to the frictional force of the friction resistance plate, and energy is absorbed after the yield strength. It is possible to effectively absorb energy by horizontally moving the mold support.

  The base plate and the frictional resistance plate both have a long hole whose longitudinal direction faces in a direction perpendicular to the structural surface of the support frame, so that the energy absorption type support in the perpendicular direction after the yield strength is achieved. Can ensure horizontal movement.

  As can be understood from the above explanation, according to the energy absorption type bearing of the present invention, the vertical load due to the roof frame that varies greatly at the time of an earthquake is not considered as a compressive force for frictional resistance. It is possible to expect a certain frictional resistance. Furthermore, by applying a configuration in which a frictional resistance plate, which is expected to have a frictional resistance with the foundation frame, is pressed against the foundation frame with a desired compression force using an axial force adjusting member, high initial rigidity and Free control of yield strength is possible.

It is an external appearance structural view of the gymnasium to which the energy absorption type support of this invention is applied. (A) is the schematic diagram explaining the composition direction in the wife's face of a gymnasium, and a perpendicular direction of a composition, (b) is the schematic diagram explaining the composition direction in the girder plane of a gymnasium, and a composition orthogonal direction. . It is a disassembled perspective view of the energy absorption type support of this invention. It is a longitudinal cross-sectional view of the structure where the energy absorption type support was attached to the basic footing of the support frame. It is a VV arrow line view of FIG. FIG. 6 is a view taken along arrow VI-VI in FIG. 4. It is a VII-VII arrow line view of FIG.

  Hereinafter, embodiments of the energy absorption type support of the present invention will be described with reference to the drawings. In the illustrated example, the energy absorption type support is applied between the support frame and the roof frame of the gymnasium. However, the energy absorption type support of the present invention is a structure other than the gymnasium, particularly various types of roof frames. Applicable to public facilities, competition facilities, and amusement facilities.

(Embodiment of energy absorption type bearing)
First, the structure of a gymnasium will be described as a structure to which the energy absorption type support of the present invention is applied with reference to FIGS.

  The illustrated gymnasium has six RC pillars C (which may be SRC pillars) on the wife's face (numbered 1 to 6 in FIG. 1), and two RC pillars in the horizontal direction perpendicular to each RC pillar C. An RC frame having a beam B (which may be an SRC beam) and having a plurality of rectangular openings is composed of the plurality of RC columns C and the RC beam B, and earthquake resistant walls W are arranged in some of the rectangular openings. The RC frame C, the RC beam B, and the seismic wall W form the supporting frame BF for the wife face.

  On the other hand, the girder face of the gymnasium has eight RC pillars C ′ (which may be SRC pillars) with a predetermined interval between the end faces (RC pillars C located at both ends) (FIG. 1). , The alphabetical parts B to I), and two RC beams B (which may be SRC beams) in the horizontal direction orthogonal to each RC column C ′, and a plurality of these RC columns C ′ and RC beams B The RC-RC frame with rectangular openings is constructed, and some of the rectangular openings have a structure in which the seismic walls W are arranged. The RC column C ′, the RC beam B, and the seismic wall W Constitutes the support frame BF of the girder-facing surface.

  Thus, in the gymnasium, the support frame BF that supports the roof frame RF is made of RC or SRC. In the illustrated gymnasium, RC floors are arranged on the first floor (1FL) and the second floor (2FL), respectively.

  As shown in FIGS. 1 and 2a, the wife surface has a high horizontal rigidity in the direction of the surface (X direction in FIG. 1) and a low horizontal rigidity in the direction perpendicular to the surface of the structure (in FIG. 1). As shown in FIGS. 1 and 2b, the horizontal plane has a high horizontal rigidity in the plane direction (Y direction in FIG. 1) and a low horizontal rigidity in the direction perpendicular to the plane of the plane (Y direction). (X direction in FIG. 1).

  On the other hand, the roof frame RF supported by the support frame BF includes an S structure frame having a plurality of rectangular openings from a steel large beam BB and a steel small beam SB, and a steel brace BR is provided in each rectangular opening. The roof frame RF is composed of the S-shaped large beam BB, the small beam SB, and the brace BR. In addition, although illustration is abbreviate | omitted, a steel plate and a sheet | seat material are laid by the roof frame RF, and a roof is comprised. Thus, the roof frame is relatively lightweight due to the S-structure frame structure.

  As shown in FIGS. 1, 2 a, and b, the energy absorption type support is installed on the RC beam B of the roof frame RF that constitutes the end surface and the girder surface of the support frame BF.

  Next, with reference to FIGS. 3-7, embodiment of the energy absorption type support of this invention is described. Here, FIG. 3 is an exploded perspective view of the energy absorption type support of the present invention, and FIG. 4 is a longitudinal sectional view of a structure in which the energy absorption type support is attached to the basic footing of the support frame. 5 to 7 are a VV arrow view of FIG. 4, a VI-VI arrow view of FIG. 4, and a VII-VII arrow view of FIG. 4, respectively.

  As shown in FIG. 3, the energy absorption type support 10 is made of steel, has a notch 3, is connected to the roof frame RF indicated by a broken line, and supports the weight of the roof frame RF (vertical load shared by one support 10). The base plate 1 is housed in the notch 3, and the friction resistance force between the base plate 1 and the support frame is larger than that of the base plate 1.

  A first anchor member 6 is inserted into each of the four first holes 2 provided in the base plate 1 and is embedded in a base footing FT (see FIG. 4) of the support frame BF to support the base plate 1. The frame BF is connected.

  Further, the second anchor member 7 is inserted into the second hole 5 provided in the friction resistance plate 4 and is embedded in the foundation footing FT of the support frame BF so that the friction resistance plate 4 and the support frame BF are connected to each other. Are connected.

  Similarly, a stainless plate 1a having a first hole 2 is fixed to a portion of the base plate 1 where the first hole 2 is formed.

  Each of the first hole 2 and the second hole 5 is a long hole, and as shown in FIG. 5, the energy absorbing support 10 is formed so that the longitudinal direction of the long holes 2 and 5 is oriented in the direction perpendicular to the plane of construction. Is installed on the foundation footing FT.

  Returning to FIG. 3, the first anchor member 6 includes a washer 6 ′ at the upper end and a pressure bearing plate 6 ″ at the lower end. When the first anchor member 6 is embedded in the foundation footing FT, It is designed to resist the pulling force acting from the roof frame RF by the frictional resistance caused by the embedded length of one anchor member 6 and the bearing resistance by the bearing plate 6 ″.

  On the other hand, the second anchor member 7 is provided with an axial force adjusting member 8 composed of a washer 7 'and a disc spring at the upper end, and the tip of the second anchor member 7 is the base as shown in FIG. By adjusting the axial force adjusting member 8 in the state embedded in the footing FT, the compression force Q with respect to the basic footing FT of the frictional resistance plate 4 can be adjusted as desired, and this absorbs energy to the support frame BF. The frictional resistance of the mold support 10 is determined.

  As shown in FIG. 5, in a state where the frictional resistance plate 4 is disposed in the notch 3 of the base plate 1, the side surface of the notch 3 and the side surface of the frictional resistance plate 4 are in metal touch.

  The energy absorption type support 10 does not expect the frictional resistance force between the base plate 1 that directly supports the weight of the roof frame RF and the floor plate FTa installed on the foundation footing FT in the direction orthogonal to the construction plane, However, only the frictional resistance force between the frictional resistance plate 4 housed in the notch 3 and touching the metal and the floor plate FTa installed on the foundation footing FT is the frictional resistance force exhibited by the energy absorption type support 10. It is something to design.

  This design philosophy does not consider the vertical load due to the roof frame RF, which fluctuates greatly during an earthquake, as a compressive force for the frictional resistance, making it possible to expect a constant frictional resistance during an actual earthquake. Become.

  The frictional resistance force between the frictional resistance plate 4 and the floor plate FTa installed on the foundation footing FT generates a desired compressive force Q by adjusting the axial force adjusting member 8, and is caused by this compressive force Q. The slip resistance is determined by the frictional resistance.

  As shown in FIGS. 4 and 6, the bottom surface of the base plate 1 is made of polytetrafluoroethylene (PTFE, Teflon (registered trademark) as a commercially available material) in order to make the base plate 1 slip easily in the event of an earthquake or the like. A frictional resistance reducing layer 9 made of DuPont)) or the like is mounted. Further, as shown in FIG. 7, a stainless plate FT1 is attached to a place facing the frictional resistance reducing layer 9 in the floor plate FTa installed on the basic footing FT.

  By interposing the frictional resistance reducing layer 9 between the base plate 1 and the floor plate FTa installed on the foundation footing FT, the base plate 1 whose yield strength is fluctuated can be easily slipped in the event of an earthquake or the like. As a result, the fluctuation of the weight received from the roof frame RF in the event of an earthquake or the like is severe, and the unstable frictional resistance element due to the heavy weight fluctuation is prevented from entering the frictional resistance exerted by the support 10. Therefore, it is possible to stably exert a certain frictional resistance against the support 10.

  On the other hand, as shown in FIGS. 6 and 7, a stainless steel plate 4a is attached to the lower surface of the frictional resistance plate 4 so that the frictional resistance plate 4 exhibits a high frictional resistance with the basic footing FT. A friction sheet FT2 is attached to a portion of the floor plate FTa installed on the floor plate facing the stainless steel plate 4a.

  Since the holes of both the base plate 1 and the frictional resistance plate 4 are not elongated in the surface direction of the support frame BF, there is no horizontal movement of the base plate 1 and the frictional resistance plate 4 on the basic footing FT, and the energy absorption type The support 10 is structurally a pin support for the support frame BF.

  On the other hand, since the holes of both the base plate 1 and the frictional resistance plate 4 are elongated holes 2 and 5 in the direction perpendicular to the surface of the support frame BF, the yielding is caused by the frictional force of the frictional resistance plate 4 in this direction. It is possible to effectively absorb energy by horizontally moving the energy absorption type support 10 after the yield strength, without moving horizontally until the yield strength.

  Both the base plate 1 and the frictional resistance plate 4 have the long holes 2 and 5 whose longitudinal directions are oriented in a direction orthogonal to the construction surface of the support frame BF (as described above, the long holes). 2 and 5 are set so that the bearings 10 are oriented in the direction perpendicular to the plane of construction), the horizontal movement of the energy absorbing bearing 10 in the direction of low horizontal rigidity, that is, the friction resistance force corresponding to the yield strength of the bearing 10 It is possible to move horizontally while maintaining the above, and to ensure the behavior in the plastic region (horizontal movement X of the base plate 1 and horizontal movement X of the frictional resistance plate 4 in FIG. 5).

  According to the energy absorption type bearing 10, a novel design concept and technical concept that has not been considered in the past are adopted, in which the vertical load due to the roof frame RF, which fluctuates greatly during an earthquake, is not considered as a compressive force for frictional resistance. By applying a configuration capable of realizing the idea, it is possible to expect a certain frictional resistance force in the event of an actual earthquake or the like. Furthermore, the compression force Q to the basic footing FT of the frictional resistance plate 4 that expects the frictional resistance is realized by adjusting the axial force adjusting member 8, which makes it possible to easily set a high initial rigidity and free yield strength. It becomes the energy absorption type support 10 that can be controlled smoothly.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and there are design changes and the like without departing from the gist of the present invention. They are also included in the present invention.

  DESCRIPTION OF SYMBOLS 1 ... Base plate, 2 ... 1st hole (long hole), 3 ... Notch, 4 ... Friction resistance plate, 5 ... 2nd hole (long hole), 6 ... 1st anchor member, 7 ... 2nd Anchor member, 8 ... Axial force adjusting member (belleville spring), 9 ... Friction resistance reducing layer, 10 ... Energy absorbing type support (support), RF ... Roof frame, BF ... Support frame

Claims (4)

An energy absorption type bearing that connects an RC or SRC support frame and an S structure roof frame supported by the support frame,
A base plate provided with a notch and connected to the roof frame to support the weight of the roof frame;
A frictional resistance plate that is housed in the notch and has a larger frictional resistance between the support frame and the base plate,
A first anchor member inserted through a first hole formed in the base plate and connecting the base plate and the support frame;
A second anchor member inserted through a second hole provided in the frictional resistance plate and connecting the frictional resistance plate and the support frame;
An energy absorption type support in which an axial force adjusting member is attached to the second anchor member, and the friction resistance plate is pressed against the support frame with a predetermined compressive force via the axial force adjusting member.   The energy absorption type support according to claim 1, wherein the axial force adjusting member is made of either a disc spring or a coil spring. The energy absorption type bearing is formed with the side surface of the notch of the base plate and the side surface of the frictional resistance plate in contact with each other.
The energy absorption type support according to claim 1, wherein a frictional resistance reducing layer is interposed between the base plate and the support frame. Both the first hole and the second hole are long holes, and the base plate and the frictional resistance plate are horizontally movable in the longitudinal direction of the long hole,
The energy absorption type support is attached to the support frame so that the longitudinal direction of the first and second long holes is oriented in a direction perpendicular to the plane of the support frame. Energy-absorbing support as described in 1.

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