JPH0742735B2 - Vibration control frame with bending deformation control mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention mainly relates to a seismic control system having a bending deformation control mechanism for reducing a response amount of a structure having a large bending deformation amount such as a high-rise building to an earthquake or wind. It is about the frame.

[Conventional technology]

The applicant has incorporated the variable rigidity element in the form of brace or wall in the column beam structure of the structure, and the rigidity of the variable rigidity element itself,
Alternatively, the connection state between the frame body and the variable stiffness element can be switched between the fixed state and the non-fixed state, or the connection state can be changed between the fixed state and the non-fixed state to prevent external vibrations such as earthquakes and winds. , Various types of active vibration control systems and variable rigidity structures have been proposed, in which the characteristics of vibration external force are analyzed by a computer, and the rigidity of the structure is changed so that the structure does not resonate, thereby ensuring the safety of the structure. Sho 62-2684
79, JP-A-63-114770, JP-A-63-114771, etc.).

[Problems to be Solved by the Invention]

By the way, shaking of a high-rise building due to an earthquake or wind includes bending deformation of columns and beams, shear deformation of a frame due to shear deformation, and bending deformation of the entire frame due to axial deformation of columns. Usually, the shaking of the building occurs as a sum of the above two deformations, and a slender building having a height higher than the width of the building has a larger bending deformation amount of the entire frame.

On the other hand, in many conventional variable rigidity structures, the rigidity of each frame of each layer is controlled and dealt with, and complicated control is required to deal with bending deformation, which is not always rational.

An object of the present invention is to provide a vibration control frame for effectively controlling bending deformation in such a multi-storey building.

[Means for Solving the Problems]

In the present invention, a shaft member extending along at least a plurality of floors in the height direction of the building is provided along a pillar of a multi-story building, and the upper and lower parts of the shaft member are part of the building, preferably the uppermost part and the lowermost part. Connect to. A connecting device that can change the connection state between free and locked or in multiple stages in the middle is provided in the middle or end of this shaft member, and by adjusting this connection state, bending can be performed against vibration disturbances such as earthquakes and winds. The rigidity of the building or the damping force can be controlled in the form of deformation control.

The structure of the present invention is effectively applied to the outer pillars of a multi-storey building, and a steel pipe, shaped steel, or other rod-shaped member is used as the shaft member.

When the column body is a steel pipe such as a square steel pipe, the bending deformation control mechanism can be prevented from appearing on the surface by inserting a steel pipe or the like as a shaft member inside thereof.

As a connecting device, a hydraulic device composed of a cylinder and a piston (hereinafter referred to as a cylinder lock device) can be used. A cylinder is connected to one of the connecting parts of the shaft member and a piston rod is connected to the other, and these relative parts are connected. The displacement can be adjusted by an on-off valve provided in the oil passage to change the frame between a rigid state and a flexible state, and the damping property of the frame can be adjusted.

[Action]

Due to an earthquake or wind, the entire frame is bent and deformed, so that a relative displacement occurs in the coupling device (between the cylinder and the piston in the case of the cylinder lock device described above).

When the top and bottom of the building are connected, the deformation is large, and even in a high-rise building it extends to several cm (the bending deformation between layers is less than the shear deformation between layers).

In the above-mentioned deformed state, by controlling the coupling device such as the cylinder lock device, the effectiveness of the shaft member provided along the column can be adjusted.

At this time, the shaft member almost bears only the axial force, and the buckling can effectively resist the axial force by restraining the displacement in the direction perpendicular to the axis by utilizing the diaphragm of each layer.

〔Example〕

 Next, examples will be described.

1 to 3 show an embodiment of the present invention, in which an inner steel pipe 1 as a shaft member is installed inside an outer steel pipe 2 which constitutes an outer column 2a of a high-rise building. The inner steel pipe 1 has a joining plate 6 and a diaphragm 5 at the top and the bottom.
The axial force of the outer steel pipe 2 is transmitted to the inner steel pipe 1 at the uppermost portion, and the axial force of the inner steel pipe 1 is transmitted to the underground column and the foundation at the lowermost portion.

Further, as shown in FIG. 3, the inner steel pipe 1 is separated from the diaphragm 4 of the beam-column joint at a small gap as shown in FIG. 3, and the state of the cylinder lock device 10 provided under the inner steel pipe 1 is shown. Accordingly, relative movement in the axial direction becomes possible.

FIGS. 4 and 5 show the outline of a building to which the structure of the present invention is applied. In this embodiment, only the outer column 2a on the outer periphery of the building, which is highly effective, has the above-mentioned double steel pipe structure and the inner column. 2b
Has a normal structure. Also, cylinder lock device
10 is installed on the first floor of the outer pillar 2a.

FIG. 6 is a conceptual diagram of the cylinder lock device 10, in which a double rod type piston 12a is inserted in the cylinder 11, and an oil passage 14 connecting the hydraulic chambers 13 on both sides of the piston 12a.
An on-off valve 15 is provided in the. The damping resistance force can be actively changed by controlling the opening degree of the opening / closing valve 15 in multiple stages. Further, if the opening degree of the opening / closing valve 15 is selected between fully open and fully closed, two states of free and locked can be realized. The damping force in this case is given as a resistance force proportional to the relative speed of the cylinder 11 and the piston 12a or the square of the relative speed.

This cylinder lock device 10 is installed in the middle of the inner steel pipe 1, and the movement due to the expansion and contraction of the pillar 2a is the cylinder lock device.
Cylinder 11 and piston 12a of 10 are joined so that relative displacement occurs.

As mentioned above, when controlling the cylinder lock device 10 in two states of free and locked, it is possible to allow expansion and contraction of the pillar,
By restraining, it is possible to perform control considering non-resonance as in the case of the conventional active vibration control system and variable rigidity structure. In addition, the on-off valve 15 can be controlled in multiple stages,
By adjusting the damping coefficient of the cylinder lock device 10 by providing an orifice with an appropriate opening, etc., depending on the structure characteristics of the building, control that considers damping properties, or consider both non-resonance and damping properties. The controlled control can be performed.

The following table (Table-1) and FIGS. 7 to 9 summarize the relationship between the deformed state of the building and the state of the cylinder lock device 10.

As shown in FIGS. 7 (a) and 7 (b), there is substantially no deformation of the building and the on-off valve 15 of the cylinder lock device 10 does not need to be controlled at all times when there is almost no vibration disturbance.

FIGS. 8 (a) and 8 (b) show the case where the on-off valve 15 is fully opened or close to the opened state, in which the inner steel pipe 1 is ineffective, and the natural period becomes long. In a seismic control system based only on the judgment of non-resonance, control is performed in this state for earthquake motions with a short dominant period. Also,
When performing control considering damping properties, the open / close valve 15 of the cylinder lock device 10 is protected against large earthquakes with large vibration levels.
A large damping force can be obtained by increasing the opening degree of (close to the open state).

9 (a) and 9 (b) show the case where the on-off valve 15 is fully closed or close to the closed state, the inner steel pipe 1 is in a sufficiently effective state, and the natural period becomes short. In the seismic control system based only on the judgment of non-resonance, control is performed in this state for earthquake motions or winds with a long dominant period.
Further, in consideration of the damping property, a large damping force can be obtained by reducing the opening degree of the opening / closing valve 15 of the cylinder lock device 10 (close to the closed state) for a small earthquake with a small vibration level. Obtainable.

〔The invention's effect〕

The present invention controls the displacement in the axial direction of a pillar of a shaft member provided over a plurality of floors of a building by adjusting the connection state of a connecting device, and as an active damping system, seismic motion and wind,
Alternatively, the response of the building can be reduced by controlling the connection state of the connection device to change according to the response of the building due to these, and compared to the case where the rigidity of each frame on each floor is controlled, The efficiency is good because it is controlled.

Further, since the rigidity of the building is changed through the shaft members extending over a plurality of floors, a large amount of deformation is dealt with as a result, and accuracy can be improved.

Further, by connecting the uppermost part and the lowermost part of the building with the shaft member and controlling the connecting device, the whole building can be controlled at one place (of course, it may be controlled at a plurality of places). The control system is relatively simple.

It is also possible to perform the control in consideration of the damping property by controlling the connection state in multiple stages.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of the present invention, and FIGS. 2 and 3 are sectional views taken along line I-I and II- of FIG. 1, respectively.
II cross-sectional view, FIG. 4 is an elevation view showing an outline of a building to which the present invention is applied, FIG. 5 is a plan view of the same, FIG. 6 is a conceptual view of a cylinder locking device as a connecting device, and FIG. ), FIG. 8 (a) and FIG. 9 (a) are schematic diagrams showing the deformed state of the building at low damping or free state, high damping or locked state against earthquake or wind, respectively.
Drawing (b), Drawing 8 (b), and Drawing 9 (b) are connection devices corresponding to the modification state of the building of Drawing 7 (a), Drawing 8 (a), and Drawing 9 (a), respectively. It is a schematic diagram showing the state of. 1 ... inner steel pipe, 2 ... outer steel pipe, 2a ... outer pillar, 2b ... inner pillar, 3
… Beams, 4, 5… Diaphragms, 6… Joining plates, 10…
Cylinder lock device, 11 ... Cylinder, 12 ... Rod,
12a ... piston, 13 ... hydraulic chamber, 14 ... oil passage, 15 ... open / close valve

Claims (4)

[Claims] 1. An upper part and a lower part of a shaft member extending along at least a plurality of floors in a height direction of the building along a pillar of a multi-story building, are connected to a part of the building, and the shaft member is provided at an intermediate or end portion thereof. A seismic control frame having a bending deformation control mechanism, characterized by interposing a coupling device in which the coupling state is variable in multiple stages of free and locked or intermediate. 2. An inner steel pipe that is continuous in the height direction of the building is provided inside an outer steel pipe that constitutes an outer column of a multi-story building, and the uppermost and lowermost portions of the inner steel pipe are respectively the upper portion and the upper portion of the building. A seismic control frame having a bending deformation control mechanism, characterized in that it is connected to a lower portion, and a connecting device intervening in the middle or at the end of the inner steel pipe, the connection state being variable between free and locked or intermediate multistage, is provided. 3. The connecting device comprises a cylinder, a piston of a double rod type reciprocating in the cylinder, an oil passage connecting hydraulic chambers on both sides of the piston, and an opening / closing valve provided in the oil passage. And a connecting device configured to connect the cylinder to one member to be connected and to connect the rod of the piston to the other member to be connected.
Alternatively, a vibration control frame having the bending deformation control mechanism described in 2. 4. The connecting device is configured to open and close the on-off valve,
The vibration control frame having a bending deformation control mechanism according to claim 3, wherein the relative movement of the cylinder and the piston is changed between a fixed state and a non-fixed state.