JPH08218683A - Vortex excitation prevention device for high-rise buildings - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a device for preventing vortex excitation of a high-rise building that can prevent vortex vibration with a simple structure. A vortex-excitation preventing device arranged at each corner of a high-rise building, wherein horizontal fins projecting outward from the corner at a predetermined interval along the horizontal direction, Provided with vertical fins joined to the protruding end sides of each of these horizontal fins along the height direction, and continuously defining in the height direction a lattice frame through which the horizontal fins and the vertical fins allow wind to flow and straighten. Is characterized by.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for preventing eddy excitation of a high-rise building, and more particularly to a device for preventing a high-rise building from shaking in a direction orthogonal to the wind.

[0002]

2. Description of the Related Art When a wind hits the front of a high-rise building, it bends at right angles from both corners of the front and flows backward along both sides. The wind that suddenly separates from the corner becomes a small vortex that winds along the side surface so as to return to the front surface, and this vortex gradually grows backward. When the natural period of this vortex and the natural period of the building coincide with each other to cause a resonance phenomenon, the high-rise building swings in a direction orthogonal to the wind.

In response to this vortex excitation, TMD has been conventionally used to suppress the vibration by moving the additional mass in the direction opposite to the shaking of the building.
(Tuned Mass Dumper) and AMD (Active Mass Dumpe)
Although this was dealt with by (r), etc., these were to reduce the shaking that had already occurred, and there was a problem that it was not a drastic countermeasure against eddy excitation and the cost was high.

Further, in order to prevent the generation of eddy currents that induce vortex excitation, members for absorbing wind energy and members for disturbing the flow of wind are installed at each corner of a high-rise building and driven when necessary. A device capable of doing so has also been proposed.

[0005]

However, these devices have a complicated structure such as a drive source and a drive transmission member, and therefore, for example, they are troublesome to install, require maintenance, and There are problems such as high cost.

The present invention has been made in view of the above points, and an object thereof is to provide a device for preventing vortex excitation of a high-rise building which can prevent vortex excitation of a high-rise building with a simple structure. Especially.

[0007]

An eddy vibration prevention apparatus according to the present invention is arranged at each corner of a high-rise building,
As means for achieving the above-mentioned object, horizontal wind-blading plates that project outward from the corners along the horizontal direction at predetermined intervals in the height direction, and in the height direction on the protruding end sides of each of these horizontal wind-blading plates. And a vertical windbreak plate joined along the same.

[0008] Here, it is desirable that each floor is set at a predetermined interval because it is easy to install, but the present invention is not limited to this, and it may be set for each floor, for example.

Further, the horizontal wind plate and the vertical wind plate are
It is a plate member having a streamlined cross section and a certain amount of expansion on the front and back sides, and examples of its material include steel plates such as glass fiber, aluminum, iron, and titanium.

Further, the projecting end side is a cross section defining the side part of the side end projecting outward of the horizontal wind plate.

In the present invention, a grid frame through which the horizontal wind plate and the vertical wind plate pass wind is defined continuously in the height direction.

That is, the lattice frame is a ventilation opening having a U-shape formed by the horizontal wind-venting plates which are arranged at the top and bottom and the vertical wind-venting plates joined to the respective projecting edges.

Further, "continuously in the height direction" does not mean that the entire area in the height direction is covered.

[0014]

In the present invention, when the wind hitting the front surface of a high-rise building is bent from both corners of the front surface, it passes through the lattice frame composed of the horizontal wind plate and the vertical wind plate,
It is rectified without peeling off sharply from the corners.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an eddy vibration prevention apparatus for high-rise buildings according to the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a front view of a high-rise building 1 provided with an eddy vibration prevention device 10, and a plan view of the building 1 is shown in FIG.
3 is an enlarged perspective view of a portion surrounded by a broken line in FIG.

The vortex-excitation preventing device 10 is provided in each of the four corners 5 of the building 1, and has horizontal fins 11 as horizontal wind-breaking plates having a streamlined cross section, and the fins 11.
In the same manner as above, the vertical fins 12 function as vertical drafting plates having a streamline cross section.

The horizontal fins 11 project from the corner portion 5 of the building 1 along the horizontal direction for each floor in the height direction to the outside on the diagonal line of the cross section (see FIG. 2). On the other hand, the vertical fins 12 are joined to the protruding end sides 11 ′ (see FIG. 3) of each horizontal fin 11 along the height direction with screws or the like. The vertical fins 12 may be divided for each floor or for each plurality of floors. Therefore, the horizontal fins 11 and the vertical fins 12 continuously define a U-shaped lattice frame through which the wind passes inside in the height direction. It should be noted that the floor near the ground does not require the grid frames (11, 12). Also, the corner portion 5
The horizontal fins 11 can be fixedly attached to the pillars by, for example, bonding or bolting, if they are made of steel, and can be integrated with the columns.

Vortex excitation prevention device 1 constructed as described above
At 0, the wind hitting the front surface 2 of the high-rise building 1
When bent from both corners 5, as indicated by the arrow
By passing through the inside of the lattice frame (11, 12), it is rectified without being rapidly separated from the corner portion 5, so that the side surface 3,
It flows relatively smoothly from 4 to the rear. Therefore, a vortex that induces vortex excitation does not occur.

Further, the manner of installation of the eddy excitation prevention device 10 in the corner portion 5 is not limited to the above diagonal line of the cross section (see FIG. 2), but as shown in the front view of FIG. You may arrange | position so that it may protrude along each side surface, and two may be extended in each corner part 5.

[0021]

As described above, according to the present invention, wind is passed through the lattice frame defined by the horizontal wind plate and the vertical wind plate so as to be continuous in the height direction of each corner of the high-rise building. By performing the rectification, the generation of the separated flow and the vortex can be suppressed, and the vortex excitation of the high-rise building can be effectively prevented.

Further, since the structure is simple, such as a drive source and a drive transmission member are not required, it can be installed in parallel with the construction of the building, and in this case, the shaking of the building under construction is also prevented. be able to.

Furthermore, maintenance is not required, and various effects such as low cost can be obtained.

[Brief description of drawings]

FIG. 1 is a front view of a high-rise building provided with an eddy vibration prevention device according to the present invention.

FIG. 2 is a plan view of a high-rise building.

FIG. 3 is an enlarged perspective view of a portion surrounded by a broken line in FIG.

FIG. 4 is a plan view showing another example of the installation mode of the vortex excitation prevention device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 High-rise building 5 Corner part 10 Vortex excitation prevention device 11 Horizontal fin 11 'Protruding edge 12 Vertical fin (11, 12) Lattice frame

Claims (1)

[Claims] 1. A vortex-excitation preventive device arranged at each corner of a high-rise building, wherein the horizontal wind blower projects outwardly along the horizontal direction from the corner at predetermined intervals in the height direction. A plate and a vertical wind plate that is joined to the protruding end sides of each of the horizontal wind plate along the height direction, and these horizontal wind plate and vertical wind plate continuously connect in the height direction a grid frame through which wind passes. Vortex excitation prevention device for high-rise buildings characterized by: