JP2010281171A - Building having damping reinforcement structure and damping damping method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively absorb vibration energy at the time of an earthquake and at the same time do not excessively increase the axial compression force of a column. [Solution] In a frame consisting of left and right columns and upper and lower beams, one end is supported by one of the upper and lower beams And a brace having the other end extending in the direction of the other beam, and a damper interposed between the other end of the brace and the other beam, and the damper is operated by relative horizontal displacement of the upper and lower beams. The damper is characterized in that, in a deformation region greater than a predetermined amount, the reaction force against the speed in the direction of increasing deformation is smaller than the reaction force against the speed in the direction of decreasing deformation.
[Selection] Figure 1

Description

  The present invention relates to a building having a vibration damping reinforcement structure and a vibration damping reinforcement method. More specifically, in a frame composed of left and right columns and upper and lower beams, one end is supported by one of the upper and lower beams. A brace whose end extends in the direction of the other beam is provided between the other end of the brace and the other beam so as to reduce shaking (deformation of the building) at the time of the earthquake and at the same time not require reinforcement of the existing column beam. The present invention relates to a building having a vibration damping reinforcement structure with a damper interposed, and a vibration damping reinforcement method using the vibration damping reinforcement structure.

  Japanese Patent Application Laid-Open No. 2004-204454 (Patent Document 1) provides a vibration damping method and a vibration damping device capable of suppressing vibrations having a relatively low frequency acting on ramen due to wind or the like without particularly increasing the thickness of a column. For the purpose of improving the construction cost of a structure that employs ramen, a damper having only one relief valve that opens at one or more predetermined cracking pressures for every one or more ramen, and 1 Disclosed is a method for suppressing vibration of a structure by disposing a damper that generates a damping force depending on one or more piston speeds. According to the invention, it is claimed that the wind load exhibits high rigidity like the brace itself, and the earthquake load exhibits a damping force in the same manner as a normal oil damper. However, in the case of the invention described in Patent Document 1, if a large damping effect is expected during an earthquake, a large axial compression force acts on the existing column due to the damper reaction force, which acts on the existing column. However, there is a problem that a sufficient damping force cannot be expected if the axial compression force is reduced.

  Japanese Patent Laid-Open No. 2006-183250 (Patent Document 2) discloses a structure in which an existing frame structure can be seismically reinforced by a vibration control device without reinforcing a cross-section of an existing column in each layer. It aims at providing the earthquake-proof reinforcement method to arrange | position. For this purpose, Patent Document 2 is a multi-layer building having a seismic reinforcement structure in which a seismic structure is disposed in an existing frame structure, and the seismic reinforcement structure includes existing columns facing each other in the existing frame structure. A damping structure is arranged in an opening surrounded by upper and lower existing beams that are laid horizontally between existing columns, and the damping structure is constituted by a reinforcing frame having a damper. Constitutes a damper restoring force in which the damping force gradually decreases at a predetermined damping force / decreasing gradient as the deformation increases in the deformation region between the predetermined damping force / decreasing start deformation point and the stroke end. By reducing the column additional axial force acting on the existing columns to which the structure is connected, the existing columns propose a structure that constitutes a no-column strength reinforcement structure even after reinforcement. However, according to Patent Document 2, no particular consideration is given to the mounting position of the brace, and it is assumed that the end of the brace is connected to the column beam joint. When this method is used, the details near the brace attachment part are complicated, and when braces are installed as vibration suppression reinforcement for existing buildings, the floor covering the frame of each column and beam, fireproof There is a problem that a construction for removing the covering and finishing material is required.

  Japanese Unexamined Patent Publication No. 2007-126830 (Patent Document 3) is a steel structure that does not require the removal of an existing slab deck, is easy to construct, and can eliminate welding work and incidental work resulting therefrom. It provides an installation structure for studs in existing buildings. According to Patent Document 3, a base plate is integrally provided at the upper and lower ends of the studs, and a plurality of reinforcing members are interposed between the upper and lower flanges of the upper and lower beams. A tension member is inserted through a hole formed in the slab to a hole in the lower end side base plate of the floor pillar and fixed by a fixing tool, and a hole in the lower side base plate and the upper end base plate of the lower floor pillar are fixed. A structure is disclosed in which a tension material is inserted through a hole formed in a slab and fixed by a fixing tool. In Patent Document 3, not only the brace cannot be used due to its structure, but there is no disclosure or suggestion about the influence of the reaction force characteristic of the damper on the axial force of the existing column and the earthquake response of the building.

JP 2004-204454 A JP 2006-183250 A JP 2007-126830 A

  The present invention is intended to solve the above-described problems of the prior art, and can effectively reduce the deformation of a building during an earthquake and can be easily provided to an existing building. It is an object of the present invention to provide a building having a damping structure that can be made or a damping structure.

To achieve the above object, the present invention provides a frame comprising left and right columns and upper and lower beams, provided with a brace having one end supported by one of the upper and lower beams and the other end extending in the direction of the other beam. A building having a damping reinforcement structure in which a damper is operated by relative horizontal displacement of the upper and lower beams with a damper interposed between the other end of the brace and the other beam,
The damper provides a building characterized in that the reaction force against the speed in the direction of increasing deformation is smaller than the reaction force against the speed in the direction of decreasing deformation in a deformation region greater than or equal to a predetermined value.

  In this specification, the brace refers to a structure having a member extending in an oblique direction. Below the specified deformation range, the reaction force of the damper does not differ whether the deformation increases or decreases, and is basically proportional to the deformation speed (however, proportional is strictly mathematically exact) Not only in the case of proportionality, but also in the case where the damper reaction force is proportional to the deformation speed, it can be simplified to understand the dynamic behavior of the building. Even if the absolute value of the speed is the same, the reaction force differs between the speed in the direction in which the deformation increases and the speed in the direction in which the deformation decreases, and the former reaction force is smaller than the latter reaction force.

  By using a damper with such reaction force characteristics, the axial force applied to the existing column during an earthquake is prevented from becoming excessive (the axial force of the column does not exceed the allowable axial compression force), and at the same time a large damping force Can be secured. In other words, the damper reaction force at the time when the displacement is increased acts in the direction of further adding axial compression force to the column receiving large axial compression load as the seismic load. And the column axial compression force due to the damper reaction force must not exceed the allowable compression force of the column, the damper reaction force at the time when the displacement is reduced is a large axial compression load as an earthquake load. This is because a large damper reaction force is not an obstacle from the viewpoint of the axial compression force of the column because it acts in a direction to cancel the axial compression force on the receiving column.

  The damper is preferably bilinear in which a reaction force-speed coefficient C1 below a predetermined speed is larger than a reaction force-speed coefficient C2 above the predetermined speed.

  In this specification, the reaction force-velocity coefficient is the velocity differential value of the reaction force, in other words, the gradient in the reaction force (vertical axis) -speed (horizontal axis) graph. Since the reaction force-velocity coefficient C1 below a predetermined speed is bilinear larger than the reaction force-speed coefficient C2 above the predetermined speed, it is possible to prevent a slow load and deformation such as a wind load. It is possible to realize a building that has a large damping and does not have an excessive reaction force against a large and high-speed load such as an earthquake load.

  The brace is a V-shaped brace whose upper end is fixed to the lower part of the upper beam and whose lower end is located in the vicinity of the lower beam. The damper has a main body fixed to the lower end of the brace and a piston provided on the lower beam. Preferably, the oil damper is fixed to the upright member.

    The upper end of the brace can be fixed to the lower part of the beam via upper and lower base plates which are provided above and below the beam and are fastened with bolts and nuts so as to press the beam from above and below. The bolts and nuts may be those that press the base plate against the beam near or outside the flange of the beam, but the bolt may penetrate the flange. At that time, if one base plate is applied to the upper surface of the beam and a slightly smaller base plate is applied to the upper end of the V-shaped brace at the lower end, even if the beam has a joint near the center, The brace can be provided without interfering with this.

  When the building is a super high-rise building, it is preferable that the vibration-damping reinforcement is continuously provided at the same position in plan view and above and below the building. In particular, it is effective to continuously provide vibration damping reinforcement vertically on the floor (multiple floors) where the interlayer displacement becomes large in the deformation mode excited during an earthquake.

Further, the present invention provides a frame comprising left and right columns and upper and lower beams, provided with a brace having one end supported by one of the upper and lower beams and the other end extending in the other beam direction, the other end of the brace and the other A method for damping and reinforcing an existing building, in which a damper is interposed between the upper and lower beams and the damper is operated by a relative horizontal displacement of the upper and lower beams.
The damper proposes a method in which the reaction force against the speed in the direction of deformation expansion is smaller than the reaction force against the speed in the direction of deformation reduction in a deformation region greater than or equal to a predetermined value.

  Further, the damper is preferably bilinear in that the reaction force-speed coefficient C1 below the predetermined speed is larger than the reaction force-speed coefficient C2 above the predetermined speed, as described for the building. It is.

  Also in this method, the brace is a V-shaped brace whose upper end is fixed to the lower part of the upper beam and whose lower end is located in the vicinity of the lower beam, the damper is fixed to the lower end part of the brace, and the piston is The oil damper is preferably an oil damper fixed to an upright member provided on the lower beam.

  In addition, when the building is a super high-rise building, it is preferable that the vibration-damping reinforcement is continuously provided at the same position in plan view in the vertical direction of the building.

FIG. 1 is a schematic diagram showing a column beam housing of a building including a vibration damping reinforcement structure according to the present invention. FIG. 2 is a diagram schematically showing the velocity reaction force characteristic (bilinear characteristic) of the damper. FIG. 3 is a diagram schematically illustrating a displacement reaction force characteristic of the damper. FIG. 4 is an elevation view showing the arrangement of the vibration-damping reinforcement structure in the high-rise building. FIG. 5 is a graph showing the seismic response analysis result of a building based on the present invention.

  Specific embodiments of the present invention will be described below on the basis of examples. However, the examples are only described to help the understanding of the invention, and therefore the present invention is not limited to the examples described below. Needless to say, it is not limited.

  FIG. 1 is a schematic diagram showing a column beam housing of a building including a vibration damping reinforcement structure according to the present invention. The upper end portion of the V-shaped brace 50 is fixed to the beam together with the base plate 40 provided on the lower surface of the beam by bolts 30 penetrating the upper and lower base plates 40 near and outside the upper and lower flanges of the beam. A concrete slab is provided on the upper surface of the beam 20, and the upper end portion of the bolt 30 is fixed to the concrete slab via a base plate placed on the upper surface of the concrete slab. A damper support plate 60 extending in the vertical direction is joined to a lower end portion of the brace 50, and a body portion of the oil damper 90 is fixed thereto. Oil damper The piston rod of the oil damper 90 is fixed to a damper support plate 70 fixed to a base plate 80 placed on the upper surface of the concrete slab. That is, the horizontal displacement between the upper beam 20 and the lower beam moves the piston rod of the oil damper 90.

  In the structure shown in FIG. 1, the upper and lower beams are joined by a joint at the center position. In the case of the structure shown in FIG. 1, since a V-shaped brace is used, unlike the Λ-shaped brace, interference between the joint portion of the beam and the vibration-damping reinforcement structure can be avoided. That is, the upper end portion of the V-shaped brace is attached to the upper beam via the left and right base plates 40, and thus does not interfere with the joint portion of the beam. The base plate 80 provided in the vicinity of the lower end of the V-shaped brace extends almost fully between the columns. However, since a concrete slab exists between the base plate 80 and the lower beam. The base plate 80 and the beam joint do not interfere with each other.

  The main body (body part) of the damper 90 is fixed to a damper indicator plate 60 provided at the lower end of the brace, and the tip of the piston rod of the damper is fixed to a damper support plate 70 fixed to the base plate 80.

FIG. 2 is a diagram schematically showing the relationship between the deformation speed of the damper 90 and the reaction force (load). The coefficient of reaction force-velocity is C1 when the velocity is less than Vr, and C2 when the velocity is Vr or more. Bilinear having a relationship of C1> C2. In the damper 90, the reaction force in the range where the speed is small is large for the speed, and the reaction force in the range where the speed is large is small for the speed.
Table 1 shows an example of such a damper characteristic.

  FIG. 3 is a diagram schematically showing the reaction force of the damper when a sinusoidal deformation is applied as a function of time, which vibrates with a constant amplitude. In the range where the deformation is small, the reaction force F is substantially constant. It is characteristic that the magnitude of the reaction force is significantly different between the direction in which the deformation increases and the direction in which the deformation decreases in the range where the deformation is large. That is, the reaction force characteristic of the damper is basically proportional to the speed (in a small deformation range), but has a speed in a direction in which the deformation increases even in the same deformation speed in a large deformation range. The damper reaction force at that time is significantly smaller than the differential damper reaction force having a speed in the direction in which the deformation decreases. Such a reaction force characteristic of the damper is, for example, that a groove is provided in a position corresponding to a large deformation range on the inner surface of the body portion on which the piston slides to reduce the viscous resistance at the time of large deformation. By using a valve, the oil flow through the groove is allowed when the deformation is increasing, but the oil flow through the groove is blocked when the deformation is decreasing. Can be realized.

  FIG. 4 shows a structure of a vibration suppression / reinforcement structure when the vibration suppression / reinforcement structure according to the present invention is applied to a high-rise building (in this specification, a building having a floor of 30 or 100 m is referred to as a high-rise building). It is an elevation view which shows an arrangement position. Vibration suppression and reinforcement structures are provided on all floors from the 1st floor to the 30th floor. The vibration damping reinforcement structure based on this invention may be provided in the position where deformation becomes large, and may be provided continuously up and down centering on the floor where interlayer displacement becomes large. Of course, it goes without saying that the vibration-damping reinforcement structure according to the present invention may be divided into two or three or more consecutive floors such as the third floor to the tenth floor and the 15th floor to the 22nd floor.

  The vibration-proof reinforcement structure in the high-rise building need not be a specific position as long as it is structurally balanced, and may be arranged in the longitudinal direction, the lateral direction, or both directions in plan view. Needless to say, it can be done.

  FIG. 8 shows the seismic response (maximum interlayer deformation angle) of a building provided with the vibration damping reinforcement structure according to the present invention and a building without the vibration damping reinforcement structure. In the graph, the rightmost line has no vibration damping reinforcement structure, and the second line from the right is the earthquake response of the building having the vibration damping reinforcement structure. As is clear from the figure, the maximum interlayer deformation angle during an earthquake is reduced by providing the vibration-damping reinforcement structure according to the present invention.

10 pillar 20 beam 30 bolt 40 base plate 50 brace 60 damper support plate 70 damper support plate 80 base plate 90 oil damper oil damper

Claims (5)

In a frame composed of left and right columns and upper and lower beams, a brace having one end supported by one of the upper and lower beams and the other end extending in the direction of the other beam is provided between the other end of the brace and the other beam. A building having a vibration-damping reinforcement structure in which a damper is operated by a relative horizontal displacement of the upper and lower beams through a damper,
The building is characterized in that the reaction force against the speed in the direction of increasing deformation is smaller than the reaction force against the speed in the direction of decreasing deformation in a deformation region that is greater than or equal to a predetermined value.   2. The damper according to claim 1, wherein the damper is bilinear in that a reaction force-speed coefficient C <b> 1 below a predetermined speed is larger than a reaction force-speed coefficient C <b> 2 above the predetermined speed. building. The upper and lower base plates are provided above and below the beam, and are fastened with bolts and nuts to press the beam from above and below,
The building according to claim 1, wherein the brace is supported by a beam via the base plate. In a frame composed of left and right columns and upper and lower beams, a brace having one end supported by one of the upper and lower beams and the other end extending in the direction of the other beam is provided between the other end of the brace and the other beam. A vibration damping reinforcement method for an existing building that provides vibration damping reinforcement that operates a damper by relative horizontal displacement of the upper and lower beams with a damper interposed therebetween,
The damper is characterized in that the reaction force against the speed in the direction of deformation expansion is smaller than the reaction force against the speed in the direction of deformation reduction in a deformation region greater than or equal to a predetermined value.     5. The damper according to claim 4, wherein the damper is bilinear in that a reaction force-speed coefficient C <b> 1 below a predetermined speed is larger than a reaction force-speed coefficient C <b> 2 above the predetermined speed. Method.

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