JP3292129B2 - Damping structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration control structure provided with a variable damping device for reducing a response of the structure due to an earthquake or the like.

[0002]

2. Description of the Related Art For example, a damping device as shown in FIG. 8 is provided in a column-to-column frame (column 11, beam 12) of a structure in the form as shown in FIG. There is a vibration damping system in which a variable damping device 1 that makes variable is installed.

[0003] Various vibration control methods using such a vibration control system have been considered, for example, Japanese Patent Publication No. 7-47896.
And Japanese Patent No. 2513297.

[0004]

By the way, in a variable damping control system for generating an optimal damping force for suppressing a shaking of a building during an earthquake, a variable damping device (for example,
The specifications of the apparatus largely depend on the damping force and speed generated in Japanese Patent Publication No. 7-45781.

[0005] The damping force can be suppressed by a damping force limiting mechanism (for example, see JP-A-7-82929) so that the damping force does not increase beyond a predetermined value. In this case, the speed tends to increase. Become.

When the response speed exceeds the permissible speed of the device as shown in FIG. 9, the damping force rapidly increases, and the device may be damaged. In addition, even if it does not reach that point, even at a timing when it is not desired to generate a damping force, a damping force according to the magnitude of the speed is generated, so that the control effect is impaired.

As an example of the above, FIG. 1 shows a simulation analysis result for confirming the degree of influence on the response value when the minimum damping coefficient of the device has a finite value.
0 is shown.

The target building is a five-story steel frame, the input earthquake motion is El Centro 50 kine, and the variable damping device is 1-4.
The control method used relative velocity feedback. Thereby, the minimum damping coefficient C _min (t / ki
It can be seen that the response values of the first and second layers increase as ne) increases.

From another point of view, when the speed is high, the response reduction effect is deteriorated.

On the other hand, as an efficient use of the vibration damping device, there is a method of installing a vibration damping device A such as a damping device via a two-layered brace 13 as shown in FIG. 11 (Japanese Patent No. 2600055). Reference). In this case, the vibration control effect can be obtained with a small number of devices, but installing the vibration control device A through two layers causes a large speed of two layers in the device, so the above-described problem remains. .

The present invention is intended to solve the above-mentioned problems in the prior art, and enables efficient vibration control by devising the arrangement of a variable damping device having the same allowable speed. The purpose is to provide a seismic control structure.

[0012]

The invention according to claim 1 of the present application is to provide an additional seismic element such as a brace or an earthquake-resistant wall in a beam-column frame, and to connect between the column-beam frame and the additional beam-resistant element or between the additional beam-resistant elements. The damping force is applied to the beam-column structure by controlling the damping coefficient of the variable damper based on the response of the beam-column structure when vibration external force such as an earthquake is input by connecting via the variable damping device. For a damping structure that is configured to reduce the response, a variable damping device is installed for each single-story column-beam frame for the lower floor, and the variable damping device is straddled over two or more layers for the upper floor. It is characterized in that it is installed for each column-beam frame.

For example, when a variable damping device having the same performance is installed, a variable damping device is arranged for each layer on the lower floor where the maximum response shear force becomes large.
Reduce the load per unit so that the response speed does not exceed the permissible speed of the equipment. For upper floors where the maximum response shear force is smaller than that for the lower floors, columns and beams that span two or more layers By installing a variable damping device for each frame,
A balance can be achieved, whereby an efficient and safe system can be configured with a small number of devices.

According to a second aspect of the present invention, in the vibration control structure according to the first aspect, a case where the variable damping device having the same allowable speed is used as the variable damping device on the upper floor and the variable damping device on the lower floor is limited. Things. In other words, basically, one type of variable damping device is used, which is economical.
It is also advantageous in terms of design and maintenance.

A third aspect of the present invention provides one form of the structure of the variable damping device used for the damping structure according to the first and second aspects. (For example, when interposed between members constituting a brace or interposed between braces of a beam-column frame of a different layer, etc.) and a cylinder connected to one of the cylinders, reciprocating in the cylinder, A piston with a rod connected to the beam-column frame and the additional seismic element or the other of the additional seismic elements, a hydraulic chamber formed on both sides of the piston, a flow path connecting the two hydraulic chambers, This is a case where a variable damping device including a provided flow control valve and control means for controlling the opening degree of the flow control valve based on the response of a structure or the like is used.

By providing a relief valve together with a flow control valve in a flow path connecting the two hydraulic chambers of the variable damping device, the damping force generated by the variable damping device is prevented from increasing beyond a set value. Damage and the like can be prevented.

According to a fourth aspect of the present invention, for the upper floor of the vibration control structure according to the first, second or third aspect, two or three or more layers are passed through a beam-and-frame structure extending over two or more layers. The present invention limits the case where an additional seismic element is provided and the additional seismic element is connected to the beam-column structure via a variable damping device.

A fifth aspect of the present invention provides a structure for installing a variable damping device while leaving a beam (girder) between the layers in the case of the fourth aspect. The case where a beam through hole for avoiding interference with the beam is formed in the middle of the brace or the like is limited.

[0019]

Next, the present invention will be described more specifically with reference to the accompanying drawings.

FIG. 1 shows an example of the arrangement of a variable damping device in an embodiment of a vibration control structure according to the present invention.

That is, in a multi-story building, the lower floor is provided with the variable damping device 1 via the braces 13 on each floor,
On the upper floor, in this example, the variable damping device 1 is installed via a brace 13 passing through two layers.

Here, the variable damping device 1 has the same or similar performance for both the lower floor and the upper floor.

FIG. 2 shows the maximum value of the velocity generated in each variable damping device when a variable damping device as an active vibration control device is applied to a 33-story high-rise building.

The earthquake motion used here is El Centro 50ki
ne, and the control law is based on two types of relative amount feedback by an optimal regulator and absolute amount feedback.

The optimal regulator is the most standard method used in active vibration control, and calculates a quadratic evaluation function weighting the state quantities such as the speed and displacement of the controlled object and the control force of the vibration damping device. This is the optimal control method to minimize.

The relative amount feedback is a method of defining the relative displacement and speed of each part of the building from the ground surface as a state amount and controlling it by feeding back the state amount, and has an effect of reducing the response of the relative coordinate system.

The absolute amount feedback is a method of defining an absolute displacement and an absolute speed of each part of a building as a state quantity and performing feedback control thereof, and has an effect of reducing the response of the absolute coordinate system.

The maximum speed of the apparatus is higher in lower floors, and about half of that in upper floors.

That is, when variable damping devices having the same permissible speed are used, the maximum speed division of the device section as shown by the bold line in the figure is obtained. Therefore, the upper floor is passed through the second floor according to the division, and the lower layer is installed at each layer. For example, the maximum speed generated in the device is almost the same.

This makes it possible to prevent the response reduction effect from deteriorating due to exceeding the permissible speed of the device and to reduce the number of variable attenuation devices.

FIG. 8 already mentioned in the section of the prior art shows an example of the variable attenuator 1, which is already known per se, and the variable attenuator used in the present invention is There is no need to be limited to this.

The main components are a cylinder 2, a piston 3, a piston rod 4, hydraulic chambers 5a and 5b formed on the left and right of the piston 3 in the cylinder 2, and both hydraulic chambers 5a and 5b.
The apparatus has a flow control valve 7 provided in the flow path 6 connecting between them, and a control means (not shown) for controlling the opening degree of the flow control valve 7.

The flow control valve 7 has a maximum damping coefficient C _max when the opening degree command is fully closed, and a minimum damping coefficient C when the opening degree command is fully open.
Give _min to the device.

In this example, a relief valve 8 is provided in parallel with the flow control valve 7 so that the damping force generated by the variable damping device 1 does not increase beyond a set value to prevent damage to the device. I have.

FIG. 3 shows a beam 12 in contact with a brace 13 as a structure for installing a variable damper through two layers.
FIG. 2 shows an example of a structure for installation with leaving (girder).

FIG. 4 shows details in a cross section taken along the line AA of FIG. 4. A beam through hole 14 is formed at a position where the brace 13 interferes with the beam 12, and the outside thereof is reinforced by a reinforcing plate 15 or the like. .

More specifically, the web at the end of the H-section steel is cut out, and two H-sections are abutted to each other to form a notch portion of the web as a beam through hole 14, which is formed by a bolt using a splice plate. A brace 13 having a beam through hole 14 is reinforced by joining or welding a reinforcing plate 15 such as a stiffening rib.

Two such braces are joined in a V-shape to form a V-shaped brace, and the upper end is joined to the upper part of a two-layer column-beam frame, and the lower end is connected via a variable damping device 1. .

FIG. 5 shows another embodiment in which interference with the girder is eliminated in the cross section along the line AA. That is, the intermediate connection portion 13M of the brace is passed through the beam 12 in advance, and joint portions are formed above and below it.

By adopting such a configuration, the workability at the site can be improved.

In FIG. 3, a brace extending over two layers is installed, whereas in FIG. 6, a V-shaped brace 13A and an inverted V-shaped brace 13B of an upper and lower column structure are connected to each other by a variable damping device 1. FIG. 3 shows a case where they are connected via a.

[0042]

According to the vibration damping structure of the present invention, the number of devices installed on the structure can be reduced without affecting the response reduction effect by using the variable damping device having the same allowable speed. .

Therefore, the cost for installing the apparatus can be reduced, and it is not necessary to prepare apparatuses having different performances, and the design and handling are facilitated.

[Brief description of the drawings]

FIG. 1 is a diagram showing an arrangement example of a variable attenuation device according to an embodiment of the present invention.

FIG. 2 is a graph showing a maximum value of a speed generated in each story variable damping device in a simulation when the present invention is applied to a 33-story high-rise building.

FIG. 3 is a schematic diagram showing an example of the position of a structure when a variable damping device is installed through two layers while leaving an intermediate girder.

FIG. 4 is a diagram showing an example of details corresponding to a cross section taken along line AA of FIG. 3;

FIG. 5 is a diagram showing details of a case where a connecting portion of a brace is previously passed through a steel girder as another example of details corresponding to a cross section taken along line AA of FIG. 3;

FIG. 6 is a diagram showing an outline of a case where braces as additional seismic elements of the upper and lower beam-column frames are connected via a variable damping device.

FIG. 7 is a view showing a general column-beam frame provided with a variable damping device.

FIG. 8 is a diagram schematically showing an example of a variable damping device structure.

FIG. 9 is a graph showing a relationship between a response speed and a damping force in the variable damping device.

FIG. 10 is a graph showing a simulation analysis result for confirming the degree of influence on the response value when the minimum damping coefficient of the variable damping device has a finite value.

FIG. 11 is a schematic diagram showing an example of a case where a conventional vibration damping device is installed via a two-layered brace.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Variable damping device, 2 ... Cylinder, 3 ... Piston, 4 ...
Piston rod, 5a, 5b ... hydraulic chamber, 6 ... flow path, 7 ...
Flow control valve, 8 ... relief valve, 11 ... pillar, 12 ... beam, 1
3 brace, 14 beam through hole, 15 reinforcement plate

Claims (5)

(57) [Claims] An additional seismic element is provided in a beam-column structure, and the column-beam frame is connected to the additional seismic element or between the additional seismic elements via a variable damping device. By controlling the damping coefficient of the variable damping device based on the response of the beam frame, etc., the damping force is applied to the beam-column structure to reduce the response. A seismic control structure characterized in that a device is installed for each single-story column structure, and a variable damping device is installed for each of the upper and lower stories in two or more layers. 2. The vibration damping structure according to claim 1, wherein the variable damping device on the upper floor and the variable damping device on the lower floor are variable damping devices having substantially the same allowable speed. 3. The variable damping device comprises: a cylinder connected to the column-beam frame and one of the additional seismic element or the additional seismic element; and a reciprocating motion in the cylinder, the column-beam frame and the additional seismic element or A piston having a rod connected to the other of the additional seismic elements, a hydraulic chamber formed on both sides of the piston, a flow path connecting the two hydraulic chambers, and a flow control valve provided in the flow path The damping structure according to claim 1, further comprising: a control unit configured to control an opening of the flow control valve. 4. On the upper floor, an additional seismic element having at least two or more layers is provided for a column-and-frame structure extending over two or more layers, and a variable attenuation is provided between the additional seismic element and the column-and-frame structure. The vibration control structure according to claim 1, 2 or 3, wherein the vibration control structure is connected via a device. 5. The vibration control structure according to claim 4, wherein the additional seismic resistance element having two or more layers is formed with a beam through hole for avoiding interference with a beam between layers.