JPH03122376A - Dynamic vibration reducer utilizing curtain wall - Google Patents

Abstract

PURPOSE:To damp vibration of a building by supporting a curtain wall by means of a support metal fitting having rigidity and an amount of damping provided between the curtain wall and the building, so as to constitute a dynamic vibration reducer which uses the curtain wall as a weight. CONSTITUTION:In a fastener 13, an L-shaped metal fitting 13a and a flat plate 13b are formed and are connected together by a bolt 15 while a viscous elastic polymer 14 is interposed in the superimposed portion of the metal fitting 13a and the flat plate 13b. In the superimposed portion, a long bolt hole 20 is formed and the connecting bolt 15 is slid so that damping forces are obtained from the polymer 14. The flat plate 13b and a curtain wall 11 are connected together by fitting a pin 19 into the lower end of an upper curtain wall 12 and the upper end of a lower curtain wall 12. Further, a pair of spring plates 1c are fixed to the metal fitting 13a and the end of the metal fitting 13a is fixed to the side of the flat plate 13c and the characteristic frequency of a building is adjustable by the pair of spring plates 13c.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a dynamic vibration absorber using a curtain wall as a weight, and is used for suppressing vibrations in buildings.

[Conventional technology]

Dynamic vibration absorbers have traditionally been used in the mechanical field primarily to counter mechanical vibrations, but they are also being applied in the architectural field to suppress building vibrations caused by wind and earthquakes. In addition to the basic dynamic vibration absorber consisting of a weight, a spring, and a damper, there are various other types such as sloshing dampers (see JP-A-62-101764), pendulum-type dynamic vibration absorbers (see JP-A-63-254247), etc. A type of dynamic vibration absorber has been developed.

[Problem to be solved by the invention] However, unlike steel towers, ordinary buildings have a very large weight, so in order to suppress the vibration of the building, which is the main vibration system, it is necessary to use the weight of the vibration absorber system. If the weight is installed separately, it is necessary to consider the weight and space of the dynamic vibration absorber in the building design. Furthermore, installation of a dynamic vibration reducer not only increases construction costs but also reduces the effective space.

By the way, PC curtain walls are often used in buildings such as buildings, and as shown in FIG. It is attached and rigidly fixed with a support metal fitting, or it is supported in a slidable manner so that it can follow the deformation of the glabella during an earthquake, as shown in Fig. 9 or Fig. 10.

In particular, PC curtain walls are relatively heavy; for example, in the case of a 30-story RC building, it accounts for 10% of the total weight of the building.
may account for. Therefore, it is conceivable to configure a dynamic vibration absorber by supporting the curtain wall on the upper floor using an elastic-plastic damper, for example, and adjusting the rigidity and damping amount to appropriate values.

The present invention was invented based on the above-mentioned background and idea. By using a curtain wall, which is a non-structural member, as a weight of a dynamic vibration absorber, it is possible to reduce the design load without creating a special space. This made it possible to damp the vibrations of the building without increasing the vibration.

[Means to solve the problem]

In the present invention, instead of fixing the curtain wall in the conventional manner or supporting it with pins and rollers, the supporting metal fittings have a predetermined rigidity and damping amount, thereby constructing a vibration system using the curtain wall as a weight. is adjusted as a dynamic vibration absorber that absorbs the vibrations of the building. In this case, for example, it is conceivable to construct the support fitting itself as an elastoplastic damper, but in place of the elastoplastic damper, a spring and a viscous damper or a viscoelastic damper with appropriate rigidity are attached to the support fitting in place of the elastoplastic damper. It can be installed as a dynamic vibration absorber against wind vibrations.

[For production]

Conventional dynamic vibration absorber theory can be applied to adjust the optimal stiffness and damping amount for the dynamic vibration absorber.

That is, in the dynamic vibration absorber model shown in Figure 7, assuming that the main vibration system is a building and the weight of the vibration absorber system is a curtain wall, the optimal frequency ratio and the optimal damping ratio are: where ω1 is The natural circular frequency of the building <-4] ω2 is the natural circular frequency of the dynamic vibration absorber using a curtain wall <=4]vJshoulder8-)μ” m
Z/m 1 m, is the mass of the building m2 is the mass of the curtain wall. Also, from ■, the optimal rigidity is as follows.

For example, if the total weight of the PC curtain wall is 10% of the total weight of the building (usually a common case), by substituting μ = 0.1 into Equations 0 and 0, the optimum frequency ratio (ω2 /ωl). □=0.932 The optimum damping ratio h2゜pt=0.142 is obtained.

Therefore, it can be seen that the shape and quantity of the damper etc. need to be adjusted so that the natural frequency is approximately matched to that of the building and the damping is approximately 14%.

〔Example〕

Next, the illustrated embodiment will be described.

FIGS. 3 and 4 show an example of a fastener 3 in which an elastoplastic damper is used as the fastener, which is a supporting metal fitting.

In other words, instead of a fastener with an angular cross-section, such as an angle, which has been conventionally used as a support fitting, an elasto-plastic damper is used in which a plurality of hole-shaped cross-section defects 4 are provided in a metal fitting with an inverted-shaped cross section to increase deformability. By utilizing this material and designing its shape, it is possible to provide the desired stiffness and damping amount against vibration. In this embodiment, as shown in Fig. 4, the shape is L-shaped when viewed from the side, and as shown in Fig. 3, bolt holes 5 for connecting the curtain wall are provided in three continuous parts of the upper plate. It is provided. A trapezoidal cross-sectional cutout 4 is formed below between each bolt hole 5 when viewed from the front, and at each tip of the three L-shaped portions below each bolt hole 5 there is a cutout section 4 for fixing the support fitting to the floor slab. A bolt hole 6 is provided. The shape of the cross-sectional defect 4 is not limited to a trapezoid, but may be appropriately designed such as a polygon, circle, or ellipse depending on the required rigidity, amount of attenuation, and the like.

FIGS. 5 and 6 show another embodiment in which a viscoelastic polymer 14 is used for a fastener 13 serving as a support fitting.

The fastener 13 in this embodiment consists of an L-mounted metal fitting 13a fixed to the building frame 11 side such as a slab, and a flat plate 13b fixed to the curtain wall 12 side, with a viscoelastic polymer 14 interposed in the overlapped part. bolt 15
It is designed to be connected with. In the figure, 16 is a bolt for fixing the L-shaped metal fitting to the frame, 17 is an adjustment bolt for positioning, and 18 is mortar. The connection between the flat plate 13b and the curtain wall 11 is achieved by fitting pins 19 extending vertically on the flat plate 13b into the lower and upper ends of the upper and lower curtain walls 12. Further, the bolt hole 20 at the overlapping portion of the L-shaped fitting 13a and the flat plate 13b is elongated, so that the connecting bolt 15 slides and a damping force can be obtained from the viscoelastic polymer 14. In addition, a pair of temporary springs 13 extending on both sides of the pole 15 are attached to the L bracket 13a.
c is fixed by welding etc., and the tip is a flat plate 13b.
It is fixed to the side (in the example shown, it is fixed to the washer part of the bolt 15), and the natural frequency can be adjusted by this leaf spring 13c.

〔Effect of the invention〕

By using a curtain wall, which has conventionally been considered a non-structural member, as the weight of a dynamic vibration absorber, the curtain wall can be effectively used to suppress vibrations in a building.

In particular, PC curtain walls are heavy, and an effective dynamic vibration absorber can be formed without special installation space, and there is no increase in load due to the weight compared to installing a separate dynamic vibration absorber, making it economical. It can be designed according to

[Brief explanation of drawings]

1 and 2 are vibration model diagrams of a dynamic vibration absorber using the curtain wall of the present invention, FIG. 3 is a front view of a support fitting in an embodiment in which an elastoplastic damper is used for the support fitting, and FIG. The figure is a side view, Figure 5 is a side view of another example in which a viscoelastic polymer is interposed in the support fitting, Figure 6 is a plan view, and Figure 7 is a diagram showing the optimum rigidity of the dynamic vibration absorber. A vibration model diagram for explaining the optimum damping ratio, Fig. 8 is a vertical cross-sectional view showing the support state of a conventional general PC curtain wall, and Figs. 9 and 10 show the deformation followability of the conventional curtain wall. It is a front view of a curtain wall showing an example. 3... Fastener, 4... Cross section missing part, 5... Bolt hole, 6... Bolt hole, 11... Building frame, 12... Curtain wall, 1
3... Fastener 13a... L-shaped fitting, 13b...
... Flat plate, 13c... Leaf spring, 14... Viscoelastic polymer 15... Bolt, 16... Bolt, 17...
・Adjustment bolt, 18...mortar, 19...bottle,
20... Bolt hole Figure 1 Figure 2 Figure 7 Figure 8 Figure 2 Figure 1゜Figure Figure Figure

Claims (2)

[Claims] (1) A dynamic vibration absorber using the curtain wall as a weight is constructed by supporting the curtain wall with a support fitting having a predetermined rigidity and attenuation provided between the curtain wall and the building. A dynamic vibration absorber using a curtain wall. (2) The dynamic vibration absorber according to claim 1, wherein the supporting metal fitting has a spring and a damper having a predetermined rigidity.