JP2012046936A - Vertical vibration control system of building floor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vertical vibration control system of a building floor, which can enhance a vibration energy absorbing effect by increasing the amount of deformation appearing in vibration control means installed between upper and lower beams or between floors, without changing the cross-section and weight of a structural member.SOLUTION: Vibration control means 13 for absorbing relative vertical vibrations of a beam 12a and a floor 12b in upper and lower sections of a building 10 is installed between the beam 12a and the floor 12b therein. A vertical material 14 for increasing a difference between natural frequencies of beams or floors in upper and lower sections on a story, on which the vibration control means is installed, is installed between the beam 12a and the floor 12b in the upper and lower sections on the story 11 on which the vibration control means 13 is installed, between beams or floors in upper and lower sections on a story above the story 11, or between beams or floors in upper and lower sections on a story below the story 11.

Description

  The present invention relates to a vertical vibration control system for a building floor suitable for use in suppressing the vertical vibration of the beam or floor in an earthquake or the like in a building having a long span beam or floor.

In general, buildings with long span beams and floors tend to generate relatively large vertical vibrations on the beams and floor due to earthquakes, walking of people, or vibration of equipment.
For this reason, as a countermeasure against the vertical vibration of the beam or floor, for example, as shown in FIG. 8, a structure in which a steel stud 3 is installed between the beam and floor 2 of the upper and lower floors of the building 1 is adopted.

  By the way, in the vertical vibration countermeasure structure using the above-described stud 3, the rigidity of the beam / floor 2 is relatively enhanced by the stud 3, and the response of the beam / floor 2 at the time of an earthquake related to the safety of the structure. However, it does not have a function to attenuate the vertical vibration. For this reason, there has been a drawback that it is difficult to obtain the effect of reducing the floor acceleration response at the time of an earthquake, which greatly affects the function maintenance of the fixtures installed on the floor 2.

  Therefore, in the past, particularly in buildings such as data centers and semiconductor factories where high-level equipment that dislikes vertical vibrations is installed, as shown in FIG. A damper 4 having a function of absorbing energy such as a viscoelastic damper or an oil damper is installed in place of the studs, and a relative deformation caused by vertical vibration between upper and lower floors is applied to the damper 4 to absorb the vibration energy. Countermeasures are implemented. Incidentally, this type of vibration suppression measure is also proposed in Patent Document 1 below.

  However, in the above-mentioned general building 1, the members having the same cross section are used as the beams / floors 2 on the upper and lower floors. In the event of an earthquake, the upper and lower floor beams and floor 2 often sway at the same frequency and amplitude. As a result, the relative deformation that occurs between the upper and lower beams 2 and the floor 2 is small, and the stroke that occurs in the damper 4 is also small. Therefore, the damper 4 cannot efficiently absorb the vibration energy, and sufficient damping is achieved. There was a problem that it was difficult to obtain a vibration effect.

  As described above, in order to increase the stroke generated in the damper 4 and enhance the vibration damping effect, the difference between the natural frequencies of the upper and lower floor beams / floor 2 is increased to increase the relative displacement generated during an earthquake or the like. It is desirable to make it.

  However, in order to increase the difference between the natural frequencies of the upper and lower beams / floor 2, the rigidity of one beam 2 is increased to increase the natural frequency, or the rigidity of the other beam 2 is decreased. Increasing the weight of the floor 2 and setting its natural frequency low results in an uneconomical design of changing the member cross section for each floor, which is not feasible.

JP 2000-266112 A

  The present invention has been made in view of the above circumstances, and by increasing the amount of deformation generated in the vibration damping means installed between the upper and lower beams or between the floors without changing the cross section or weight of the structural member, the vibration energy can be reduced. It is an object of the present invention to provide a vertical vibration control system for a building floor that can enhance the absorption effect.

  In order to solve the above problems, the invention according to claim 1 is provided with vibration damping means for absorbing the relative vertical vibrations of the upper and lower beams or the floor between the upper and lower beams or the floor of the building, The installation floor of the vibration control means between the upper and lower beams or floors of the installation floor of the vibration control means, or between the upper and lower beams or floors of the upper floor of the installation floor, or between the upper and lower beams or floors of the lower floor The vertical material which increases the difference in the natural frequency of the upper and lower beam or floor is installed.

  According to a second aspect of the present invention, in the first aspect of the present invention, the damping means is a viscous damper. Here, an oil damper, a viscoelastic damper, or a viscous damper is applicable as the viscous damper.

  The invention according to claim 3 is the invention according to claim 1 or 2, wherein the vertical member is a rotary inertia mass damper.

  On the other hand, the invention according to claim 4 is the invention according to claim 1 or 2, wherein the vertical member is a stud and the vibration damping means is located above and below the upper floor on which the stud is installed. It is installed between the beams or between the floors and / or between the upper and lower beams or the floor of the lower floor.

  According to the invention according to any one of claims 1 to 4, since the vertical member that increases the difference in the natural frequency in the upper and lower beams or the floor on which the vibration damping means is installed is installed, When the upper beam or floor vibrates up and down due to the above, etc., the relative displacement increases due to the difference in natural frequency between the two. As a result, the amount of deformation generated in the vibration damping means can be increased, and the vibration energy absorbing effect of the vibration damping means can be enhanced.

  At this time, when a rotary inertia mass damper is used as the vertical member as in the invention described in claim 3, the rotary inertia mass is caused by vertical vibration between the upper and lower beams or floor generated during an earthquake or the like. The damper is activated to generate additional mass in the vertical direction. The additional mass can reduce the natural frequency of the beam or floor and increase the amount of relative deformation between the upper and lower beams or the floor. As a result, it is possible to increase the amount of deformation generated in the vibration damping means, and to enhance the effect of absorbing vibration energy by the vibration damping means.

  On the other hand, when the stud is used as the vertical member as in the invention described in claim 4, the upper beam or floor and the lower beam or floor of the floor to which the end of the stud is connected. The natural frequency increases more than the natural frequency of the beams or floors of other floors. As a result, by installing the vibration damping means between the upper and lower beams or floors of the upper floor of the floor where the studs are installed and / or between the upper and lower beams or floors of the lower floor, the upper and lower ends of the vibration damping means It is possible to increase the amount of relative deformation between the parts and increase the absorption effect of vibration energy in the same manner.

BRIEF DESCRIPTION OF THE DRAWINGS It is the whole schematic block diagram which looked at the longitudinal cross-section which shows 1st Embodiment of this invention. It is a longitudinal cross-sectional view which shows the structure of the rotation inertia mass damper of FIG. It is the whole schematic block diagram which looked at the longitudinal cross-section which shows 2nd Embodiment of this invention. It is the whole schematic block diagram which looked at the longitudinal cross-section which shows 3rd Embodiment of this invention. It is the whole schematic block diagram which looked at the longitudinal cross-section which shows 4th Embodiment of this invention. It is the whole schematic block diagram which looked at the longitudinal cross-section which shows 5th Embodiment of this invention. It is the whole schematic block diagram which looked at the longitudinal cross-section which shows 6th Embodiment of this invention. It is the whole schematic block diagram which looked at the longitudinal cross-section which shows the structure of the conventional vertical vibration countermeasure. It is the whole schematic block diagram which looked at the longitudinal cross-section which shows the structure of the other conventional vertical vibration countermeasure.

(First embodiment)
1 and 2 show a first embodiment of a vertical vibration control system for a building floor according to the present invention. In this building 10, upper and lower beams or floors (hereinafter referred to as beams and floors) of a specific floor 11 are shown. A plurality of (two in the figure) viscous dampers (damping means) 13 are installed between the upper and lower beams and floors 12a and 12b (shown as floors) 12a and 12b. Has been.

  Here, an oil damper, a viscoelastic damper, a viscous damper, or the like is used as the viscous damper 13. A rotary inertia mass damper (vertical material) 14 is further installed in parallel on the floor 11 where these viscous dampers 13 are installed.

  As shown in FIG. 2, the rotary inertia mass damper 14 is rotatably provided on the lower beam / floor 12b of the floor 11 in a state where the lower end portion 15b of the screw shaft 15 is prevented from moving in the axial direction. At the same time, the upper end portion 15 a of the screw shaft 15 is rotatably screwed into the ball portion 16 fixed to the upper beam / floor 12 a, and a disc-like weight 17 is fixed to the outer periphery of the screw shaft 15. It is constituted by.

  As a result, when the rotary inertia mass damper 14 undergoes relative deformation between the upper and lower beams and the floors 12a and 12b, the screw shaft 15 and the weight 17 rotate together to rotate the weight 17. An additional mass ΔM corresponding to the inertial force is generated.

  According to the vertical vibration damping system configured as described above, when relative deformation occurs between the upper and lower beams / floors 12a and 12b due to vertical vibration during an earthquake or the like, the screw shaft 15 of the rotary inertia mass damper 14 rotates. Thus, an additional mass ΔM is generated due to the rotational inertia force of the weight 17 in the vertical direction.

Here, the additional mass ΔM can be calculated by ΔM = 2 · mp · (π · R / L) ² where mp is the mass of the weight 17, R is the radius, and L is the lead of the male screw on the screw shaft 15. it can. As a result, the natural beams of the upper and lower beams / floors 12a and 12b are reduced (softened), and the relative deformation amount between them is increased. As a result, the amount of deformation (stroke) generated in the viscous damper 13 can be increased without changing the cross section or weight of the structural member, and the vibration energy absorption effect can be enhanced.

  Since the rotary inertia mass damper 14 is used as the vertical member, the vibration due to the viscous damper 13 is determined by appropriately adjusting the mass m, radius R, and lead L of the weight 17 to determine ΔM. It becomes possible to adjust the energy absorption performance.

(Second Embodiment)
FIG. 3 shows a second embodiment of the present invention. The same components as those shown in FIG. 1 and FIG.
In this vertical vibration damping system, a viscous damper 13 is installed between the upper and lower beams / floors 12c and 12a of the upper floor 20 on which the rotary inertia mass damper 14 is installed, and the upper and lower beams of the lower floor 21 are also installed. A viscous damper 13 is installed between the floors 12b and 12d.

  Thereby, the rotary inertia mass damper 14 is installed on the lower floor of the installation floor 20 of one viscous damper 13 and the rotary inertia mass damper 14 is installed on the upper floor of the installation floor 21 of the other viscous damper 13. It has an installed structure.

  In this vertical vibration damping system, when vibration is generated in the building 10, the natural frequency of the upper and lower beams / floors 12 a and 12 b is lowered by the rotary inertia mass damper 14. As a result, the difference between the natural frequency of the beam / floor 12a, 12b and the natural frequency of the beam / floor 12c, 12d where the rotary inertia mass damper 14 is not installed increases.

  Thereby, the relative displacement between the upper and lower beams / floors 12c, 12a of the upper floor 20 on which the rotary inertia mass damper 14 is installed, and the relative displacement between the upper / lower beams / floors 12b, 12d of the lower floor 21. Therefore, the vibration energy absorption effect by the viscous damper 13 installed in these floors 20 and 21 can be enhanced.

(Third embodiment)
FIG. 4 shows a third embodiment of the present invention.
In this embodiment, instead of the rotary inertia mass damper 14 in the second embodiment shown in FIG. 3, a steel, concrete, or reinforced concrete stud 18 is provided. Thereby, the above-mentioned pillar 18 is installed in the lower floor of the installation floor 20 of one viscous damper 13 and the above-mentioned pillar 18 is installed in the upper floor of the installation floor 21 of the other viscous damper 13. .

  Therefore, in the vertical vibration damping system according to the present embodiment, the natural frequencies of the upper beam / floor 12a and the lower beam / floor 12b of the floor to which the ends of the studs 18 are connected are It increases more than the natural frequency of the floors 12c, 12d, etc. As a result, by installing the viscous damper 13 between the upper and lower beams and floors 12c and 12a of the upper floor 20 of the floor where the stud 18 is installed and between the upper and lower beams and floors 12b and 12d of the lower floor 21, The amount of relative deformation between the upper and lower end portions of the viscous damper 13 can be increased, and the effect of absorbing vibration energy can be similarly enhanced.

  The first to third embodiments described above show the basic configuration when the viscous damper 13 is installed on the floor 11 or the floors 20 and 21 and the rotary inertia mass damper 14 or the stud 18 is installed as a vertical member. By combining these variously, the damping effect of the viscous damper 13 is appropriately applied to the entire building 10 or a desired floor as illustrated in the fourth to sixth embodiments. It can be further increased.

(Fourth embodiment)
That is, FIG. 5 shows a fourth embodiment of the present invention, and this vertical vibration damping system is provided on the first floor 30, the top floor 31, and the intermediate floor (the third floor and the fourth floor in the figure) 11, 21. A viscous damper 13 is installed, a rotary inertia mass damper 14 is installed between the upper and lower beams and floors 12d and 12e of the second floor, and the upper and lower beams and floor 12c of the intermediate floor (the fifth floor in the figure). A space 18 is installed between 12a.

(Fifth embodiment)
FIG. 6 shows a fifth embodiment of the present invention. In this vertical vibration damping system, viscous dampers 13 are installed on intermediate floors 11, 20, and 21, respectively. At the same time, studs are installed on the first floor, the second floor, and the top floor, and a rotary inertia mass damper 14 is installed on the intermediate floor (fourth floor in the figure).

  FIG. 7 shows a sixth embodiment of the present invention. In this vertical vibration damping system, a viscous damper 13 is installed on the first floor 30 and a rotary inertia mass damper 14 is installed on the first floor. In addition, the pillar 18 is installed on the 2nd to the top floor.

  Even in the vertical vibration damping system shown in the fourth to sixth embodiments, the viscous damper 13 in which the relative deformation between the upper and lower beams and the floor is increased by the rotary inertia mass damper 14 or the intermediary column 18, during the earthquake. Therefore, it is possible to effectively absorb the energy of vertical vibrations generated in the floor and improve the floor damping performance.

DESCRIPTION OF SYMBOLS 10 Building 11, 20, 21, 30, 31 Installation floor of viscous system damper (vibration control means) 12a-12e Beam or floor 13 Viscous system damper (vibration control means)
14 Rotating inertia mass damper (vertical material)
15 Screw shaft 17 Weight 18 Spacer (vertical material)

Claims (4)

  Between the upper and lower beams of the building or between the floors, install vibration control means that absorb the relative vertical vibration of these upper and lower beams or floors, and between the upper and lower beams or floors of the floor where the vibration control means are installed, Or, increase the difference in natural frequency between the upper and lower beams or floor of the installation floor of the vibration control means between upper and lower beams or floors of the upper floor of the installation floor or between upper and lower beams or floor of the lower floor Vertical vibration control system for building floors, characterized by installing vertical materials.   2. The building floor vertical vibration damping system according to claim 1, wherein the damping means is a viscous damper.   The vertical vibration damping system for a building floor according to claim 1, wherein the vertical member is a rotary inertia mass damper.   The vertical member is a stud, and the damping means is installed between upper and lower beams or floors of the upper floor of the floor where the stud is installed and / or between upper and lower beams or floors of the lower floor. The building floor vertical vibration damping system according to claim 1, wherein the building floor vertical vibration damping system is provided.

Images