JP6098866B2 - Vertical vibration control structure - Google Patents

Description

  The present invention relates to a vibration control structure for a multilayer building, and more particularly to a vertical vibration control structure for suppressing a vertical vibration of a center part of a floor structure for a frame of an upper layer part in a multilayer building.

As a structural form of the multi-layered building, for example, a so-called megastructure as shown in Patent Documents 1 and 2, particularly a structure in which the megastructure is configured by a substantially high rigidity feelendale frame has been proposed.
In addition, for example, Patent Document 3 proposes an active control type damping structure with a fail-safe function installed in a lower floor as an example of applying a damping structure to such a multilayer building. Has been.

Further, as a vibration damping mechanism that can be suitably applied to a multilayer building, for example, a tuning-type vibration damping mechanism using a rotary inertia mass damper as disclosed in Patent Documents 4 to 7 has been proposed.
As is well known, a rotary inertia mass damper is a damper that uses the rotary inertia mass effect, and the mass of the device itself is light, but is equivalent to a mass several hundred to several thousand times that of the built-in rotary weight. It can be effective.
Specifically, by converting the linear motion due to the vibration of the object to be controlled to the rotational motion of the rotating weight using the ball screw mechanism, the rotating weight is caused by the reaction force proportional to the rotating inertia moment generated in the rotating weight. A large mass effect can be obtained by enlarging the actual mass of the material to several hundred to several thousand times.

An element that functions as an additional spring for such a rotary inertia mass damper (in addition to a special additional spring element, it is also possible to use the spring rigidity of the casing of the vibration control object) is provided in series. By constructing an additional vibration system and tuning the vibration characteristics of the additional vibration system with respect to the object to be controlled so as to function as a TMD, it is only one hundredth of the large additional mass required in the original TMD. Only by using a small and lightweight rotating weight having a mass of 1 / 1,000, an excellent damping effect equivalent to or better than that of the original TMD can be obtained.
In addition, by using a rotary inertia mass damper having a damping function, it is possible to provide a desired damping performance by itself, and when the rotary inertia mass damper alone is insufficient in damping performance, By providing an appropriate damping element, it is possible to give a desired energy absorption.

JP 2001-107461 A JP 2004-300681 A Japanese Patent Laid-Open No. 11-13304 JP 2009-174777 A JP 2010-189902 A JP 2010-281407 A JP 2011-252341 A

By the way, among the multi-layered building structures, for example, in hospital facilities and hotel accommodations, the upper floors where hospital rooms and guest rooms are placed are configured as relatively short span frames, and lobby and banquet halls. It is desirable to construct a low-story floor with a large span frame, but if the low-story floor is simply a large-span frame, the upper floor, where the habitability is important, has the necessary vibration characteristics especially in the center. It may be difficult to ensure.
Furthermore, it is becoming common to make the entire multi-layered building a seismic isolation structure. However, in a conventional general seismic isolation structure, horizontal vibration during an earthquake can be reduced, but it is difficult to reduce vertical vibration.

  In view of the above circumstances, the present invention can reduce vibrations in the vertical direction in the central portion of the upper layer where the habitability is particularly important, for example, for multi-layered buildings intended for use in hospital facilities, lodging facilities, etc. The object is to provide an effective and appropriate vertical vibration control structure.

  The present invention is a vertical vibration control structure for controlling the vibration in the vertical direction of the center part of the floor structure for a frame of the upper layer part in the multilayer building, and includes a plurality of layers of the upper layer part in the multilayer building. In addition to the vibration suppression target layer, the lower layer lower than the upper layer portion of the vibration suppression target layer is used as a support layer, and the vibration layer at the center portion of the structure of the vibration suppression target layer is relative to the support layer in the vertical direction. It is supported so that it can vibrate, and the frame of each upper layer as the vibration suppression target layer is configured as a Feelendale frame having inter-columns, and the vibration area at the center of the Feelendale frame of each layer is connected A main frame that behaves integrally in a structural manner, and a frame in the support layer is configured as a support frame that supports the main frame, and a rotary inertia mass damper is provided between the support frame and the main frame. The by interposing an additional damping mechanism configured tuned mainly characterized by comprising by tuning the natural frequency of the additional damping mechanism to the natural frequency of the main Frames.

According to the present invention, a plurality of upper layer portions in a multi-layered building are used as vibration control target layers, and the frame there is formed by a Feelendale frame having a stud, and the vibration area at the center of the Feelendale frame of each layer is formed. It is constructed as a main frame that is connected and behaves as a unitary structure, and the entire main frame is supported by a low-level support frame, and a tuned additional damping mechanism mainly composed of a rotary inertia mass damper between them. By interposing, the additional vibration control mechanism can function as TMD, and the vertical vibration of the main frame (the entire vibration area at the center of the Feelendale frame of each layer) during an earthquake can be effectively suppressed.
Therefore, when the present invention is applied to a multi-layered building such as a hospital or a hotel, the upper layer portion in which a living room such as a hospital room or a guest room is required to have a high habitability is arranged in a relatively short span Feelendale. Superior structure for multi-layered upper layers while adopting the optimum frame form without any trouble to make the low-rise part a pillarless large span frame in order to secure large spaces such as lobby and banquet hall etc. Therefore, it is extremely effective and reasonable as a vertical vibration control structure applied to this kind of multi-layer building.

The embodiment of the up-and-down damping structure of the present invention is shown, (a) is an elevation view which shows a multilayered building to be controlled as a structural model, and (b) is a perspective view. It is a figure which shows the example of 1 structure of an additional damping mechanism. FIG. 4 shows a specific design example. (A) is an elevation view showing an analysis model for vibration analysis, (b) is a view showing vibration modes by vibration analysis, and (c) is a model specification. FIG. FIG. 6 is a diagram showing vibration characteristics, where (a) shows a transfer function in the case of non-damping as a comparative example, and (b) shows a transfer function in the case of damping according to the present embodiment. 4A is a diagram showing an input waveform for vibration analysis, and FIG. 4B is a diagram showing a response spectrum of the input wave. It is a figure which shows an analysis result, (a) is a figure which shows the response waveform about the displacement and acceleration in the case of the non-vibration as a comparative example, (b) is the displacement in the case of the vibration suppression by this embodiment, and The figure which shows the response waveform about acceleration, (c) is a figure which shows the ratio of the maximum value of the response in the case of vibration suppression with respect to the case of non-vibration suppression.

An embodiment of the vertical vibration damping structure of the present invention will be described with reference to FIGS.
FIGS. 1A and 1B are diagrams showing a multilayer building to be controlled as a structural model, and FIG. 2 is a diagram showing a configuration example of an additional vibration control mechanism.
As an application of the multi-layer building in the present embodiment, for example, an accommodation facility such as a hospital facility or a hotel is assumed. Therefore, a large number of relatively small rooms such as hospital rooms or accommodation rooms are arranged in the upper layer portion, and in the lower layer portion. It is assumed that large spaces will be provided in the lobby and banquet hall.

  The vertical vibration control structure of the present embodiment is a structure for controlling the vibration in the vertical direction of the center part of the floor structure for the frame of the upper layer part in the multilayer building, and a plurality of upper layer parts in the multilayer building are controlled. The layer (11 layers in the example shown in the figure, where hospital rooms, accommodation rooms, etc. are arranged) is the vibration control target layer, and the entire central part of each frame is used as the vibration control target vibration area. The lower layer of the lower layer is used as a support layer (a large space such as a lobby or a banquet hall is provided here as described above), and the entire vibration area is supported by the frame of the support layer so as to allow relative vibration in the vertical direction. Based on that.

Then, each frame of the upper layer as the vibration suppression target layer is configured as a relatively short span Feelendale frame 1 having the studs 1a, and the center portion of each layer of the Feelendale frame 1 is set as the vibration control target. These are connected as a vibration area (see FIG. 1A), and the whole is configured as a main frame 2 that behaves structurally and integrally.
In the present invention, the “central part of the Feelendale frame” and the “vibration area” are parts of the entire Feelendale frame excluding the joints to the columns at both ends, that is, a part that vibrates substantially vertically. Means.
On the other hand, the frame in the lower layer support layer is configured as a large-span and high-rigidity support frame 3 that can stably support the entire main frame 2, and the rotational inertia between the main frame 2 and the support frame 3 A tuning-type additional vibration damping mechanism 4 composed mainly of a mass damper 5 is interposed.

A specific configuration example of the additional vibration damping mechanism 4 in the present embodiment is shown in FIG. This is the same as that shown as a damper mechanism in Patent Document 5, for example, and is a known rotary inertia mass damper 5 using a ball screw mechanism and an additional spring comprising a leaf spring connected in series thereto 6.
The additional damping mechanism 4 in the illustrated example connects the rotary inertia mass damper 5 to the support frame 3 in the lower layer portion via a support 7 such as a pipe material, and the additional spring 6 is connected to an upper layer via an appropriate mounting member 8. The main frame 2 is connected to the main frame 2 and the support frame 3 by being connected to the main frame 2 (the lowest-level Feelendale frame 1 of the vibration control target layers). Then, the natural period determined by the mass effect of the rotary inertia mass damper 5 and the additional spring 6 is such that it functions as a TMD for the vertical vibration of the main frame 2 with respect to the support frame 3 and exhibits a damping effect. It is supposed to be synchronized with the natural period.

The rotary inertia mass damper 5 has a ball nut 5a fixed to the upper end portion of the support column 7, and passes through the inside of the ball nut 5a. The upper end portion of the rotary inertia mass damper 5 is rotatable with respect to the central portion of the additional spring 6. The ball screw shaft 5b is supported so as not to be axially displaceable, and the flywheel 5c is attached to the lower end of the ball screw shaft 5b.
Note that reference numeral 9 in the additional damping mechanism 4 shown in FIG. 1 is a damping element. As the damping element 9, the damping function of the rotary inertia mass damper 5 itself can be used. If necessary, an oil damper is used. An appropriate damping mechanism such as the above may be connected in parallel with the rotary inertia mass damper 5.

In the additional vibration control mechanism 4 configured as described above, the main frame 2 constituting the entire vibration area to be controlled is vibrated in the vertical direction with respect to the lower frame support frame 3 constituting the support layer. At this time, the ball screw shaft 5b is displaced (rotated) with respect to the ball nut 5a via the additional spring 6 while being displaced in the vertical direction, and accordingly, the flywheel 5c is rotated together with the ball screw shaft 5b. The inertial mass acts on the main frame 2 as a damping force, whereby the additional damping mechanism 4 functions as a TMD and an excellent damping effect on the main frame 2 is obtained.
Therefore, by applying the vertical vibration control structure of the present embodiment to hospital facilities or hotel accommodations, it is possible to effectively suppress vertical vibrations during an earthquake in a hospital room or accommodation room arranged in the upper layer. The living performance can be secured.

  As a modified example of the additional damping mechanism 4, a ball nut 5a that is rotatably supported by the ball screw shaft 5b with respect to the additional spring 6 and screwed to the ball nut 5a is not axially displaceable and rotatable. The flywheel 5c may be provided so as to be integrally rotatable with respect to 5a, and thereby the same function is achieved. In short, the vertical vibration of the main frame 2 with respect to the support frame 3 may be converted into a rotational motion by a ball screw mechanism using a ball screw shaft 5b and a ball nut 5a to rotate the flywheel 5c.

Hereinafter, a specific design example of the vertical vibration control structure of the present invention will be shown with reference to FIGS.
FIG. 3A shows an analysis model. As described above, in this design example, the low-rise frame is used as a support frame to support the main frame, and the support frame has a large span and high rigidity mainly for securing large spaces such as lobbies and banquet halls. It has a frame.
In addition, the upper frame is a relatively small span Feelendale frame with a stud to provide private rooms such as hospital rooms and lodging rooms, etc., while ensuring the horizontal rigidity of each layer by the Feelendale frame of each layer, The whole central part of the Feelendale frame of each layer is structurally integrated so as to constitute the main frame in which the entire vibration area to be controlled is structurally integrated.

FIG. 3B shows a vibration mode by eigenvalue analysis. As a result, it can be seen that the entire main frame as the vibration area to be controlled is vibrated vertically.
In this case, the natural primary natural period is 0.21 seconds. The equivalent mass of the main frame portion is about 3000 tons, which is assumed to be three planes in the direction perpendicular to the plane where the additional vibration damping mechanism is arranged as shown in FIG.
In contrast, FIG. 3C shows model specifications when the inertial mass of the rotary inertial mass damper is about 30 tons (mass ratio μ = 1% with respect to the equivalent mass of the main frame portion). In other words, in this design example, the vibration of the three planes is controlled by a single rotary inertia mass damper.

In order to investigate the vibration characteristics, a 2-8Hz sweep wave was applied as the ground motion (time increment 0.005 seconds, duration 966.56 seconds). The attenuation coefficient of the main system is 1%.
The Fourier spectrum ratio with respect to the acceleration of the main system is shown in FIGS. 4 (a) and 4 (b). In the vibration suppression system shown in FIG. 4B (the present design example), it can be seen that the peak at the natural frequency is greatly reduced as compared with the non-vibration control system shown in FIG.

  Next, seismic response analysis is performed. The input seismic motion was the response acceleration at the base of the outer column of the target frame obtained by inputting the vertical seismic motion of the design input seismic motion (notification wave) to the overall model of the target frame, and was input to the foundation fixed model. The acceleration waveform used for the analysis is shown in FIG. 5 (a), and the response spectrum is shown in FIG. 5 (b).

The response results are shown in FIGS. 6 (a), (b), and (c). 6A shows the displacement and acceleration in the non-damping system, FIG. 6B shows the displacement and acceleration in the damping system (this design example), and FIG. 6C shows the maximum response value. A comparison of values is shown.
From these figures, it can be seen that the maximum acceleration is 1G or more in the non-damping system, but about 0.8G in the damping system (this design example), which can be suppressed to such an extent that the jumping of the fixture can be prevented. .
It can also be seen that the maximum displacement is 12 mm or more in the non-damping system, but can be reduced to about 9.5 mm in the damping system (this design example).

As described above, according to the present invention, a plurality of upper layers in a multi-layered building are used as vibration suppression target layers, and the frame there is formed by a Feelendale frame having a stud, and the Feelendale frame of each layer is formed. It is constructed as a main frame that structurally behaves integrally by connecting the vibration areas in the center of the main frame, and the main frame is supported by a low-level support frame, with a rotary inertia mass damper as the main component. By interposing a tuned additional vibration control mechanism, the additional vibration control mechanism functions as TMD, and the vertical vibration of the main frame (the whole vibration area at the center of the Feelendale frame in each layer) is effective during an earthquake. Can be suppressed.
Therefore, the present invention is extremely effective as a vertical vibration control structure to be applied to a multi-layered building having a large space in the lower layer and a high space in the lower layer, such as a hospital or a hotel. It is reasonable.

In addition, the multi-layered building to which the vertical vibration control structure of the present invention is applied is used in combination with a base isolation structure that supports the whole or the entire upper layer of the vibration suppression target in a horizontal direction by a base isolation device such as laminated rubber. It is also possible to obtain a sufficient vibration suppressing effect not only in the vertical direction but also in the horizontal direction at least for the upper vibration suppression target layer.
Of course, the above embodiment is merely an example, and the specific structure, form, and other specifications of the main frame and the support frame as well as the scale and use of the multilayer building to which the present invention is applied are described in the gist of the present invention. Of course, appropriate design changes can be made within the range.

1 Fieldendale frame 1a Spacer 2 Main frame (vibration area subject to vibration control)
DESCRIPTION OF SYMBOLS 3 Support frame 4 Additional damping mechanism 5 Rotating inertia mass damper 5a Ball nut 5b Ball screw shaft 5c Flywheel 6 Additional spring 7 Strut 8 Mounting member 9 Damping element

Claims (1)

A vertical vibration control structure for controlling the vertical vibration of the center part of the floor structure for the upper frame in a multi-layer building,
A plurality of upper layers in the multi-layered building are used as vibration control target layers, and a lower layer lower than the upper layer as the vibration control target layer is used as a support layer, and the structure of the vibration control target layer is formed by the support layer. The vibration area at the center of
The upper layer structure as the vibration control target layer is configured as a Feelendale frame having a stud, and the vibration area at the center of the Feelendale structure of each layer is connected to be structurally integrated. Configured as a main frame,
The frame in the support layer is configured as a support frame that supports the main frame, and a tuning-type additional vibration suppression mechanism that is mainly configured by a rotary inertia mass damper is interposed between the support frame and the main frame. An upper and lower vibration damping structure, wherein the natural frequency of the additional vibration damping mechanism is synchronized with the natural frequency of the main frame.

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