JP2526660B2 - High damping addition device for structures - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a structure main body of a structure and a variable rigidity element, or a pair of variable rigidity elements provided in the structure, which are connected to each other so as to connect a structure such as an earthquake. The present invention relates to a high damping addition device for protecting a structure from a vibration disturbance by passively changing a connection state and a damping state according to a vibration level.

The variable stiffness element referred to in the present application is, for example, a brace or a seismic wall, which is arranged as a seismic element in the main body of a beam / column structure, and has an effect on the rigidity of the frame (a contribution to the rigidity).
Means a structural member having a function of changing the rigidity of the frame, and in that case, the high damping addition of the present invention is added between the pillar or beam that constitutes the frame main body and the brace or the like as the variable rigidity element. The device will be deployed. Further, for example, when the device of the present invention is interposed in a brace as a structural member, the seismic resistant element means a part of the structural member, and in that case, the high damping of the present invention is provided between a pair of members constituting the brace. An additional device will be arranged.

[Conventional technology]

The applicant has incorporated variable stiffness elements in the form of braces or walls into the column beam structure of the structure to make the stiffness of the variable stiffness element itself or the connection state between the frame body and the variable stiffness element variable, and With respect to external vibration forces such as, we analyze the characteristics of the external vibration forces with a computer and propose an active vibration control system and a variable rigidity structure that changes the rigidity of the structure so that it does not resonate to ensure the safety of the structure. (For example, JP-A-62-268479, JP-A-63-114770, JP-A-63-
No. 114771).

[Problems to be Solved by the Invention]

By the way, the conventional active seismic control system mainly focuses on the relationship between the predominant period such as seismic motion and the natural frequency of the structure (usually, the first natural frequency is often a problem). On the other hand, by actively shifting the natural frequency of the structure, the resonance phenomenon is avoided and the response amount is reduced.

However, especially in the case of earthquake motion or the like, since it is unsteady vibration, it may be considered that the optimal control is not necessarily performed, for example, when the prominent period is not clear or when there are plural prominent periods.

In addition, in the case of active seismic control system, various sensors are used in addition to the control computer, so if there is any abnormality, various control systems are required, such as the need for various safety maintenance mechanisms. There may be problems with In addition, there may be a case where it takes time until a sufficient effect is exhibited due to a delay in control.

The high damping addition device of the present invention is configured so that, when it is interposed between the frame body and the variable rigidity element, the damping coefficient of the device automatically changes according to the vibration level of the structure due to vibration disturbance, It enables passive seismic control that does not require a control system based on programs, etc., and aims to ensure the safety of the structure in consideration of damping and to realize a comfortable living space.

[Means for solving the problem]

The body part of the high damping device for a structure of the present invention comprises a frame body and a variable rigidity element of the structure, or a cylinder connected to one of a pair of variable rigidity elements provided in the frame body, and the frame body. A variable-rigidity element, or the other of the pair of variable-rigidity elements, and a piston of a double rod type that reciprocates in the cylinder, hydraulic chambers provided on both sides of the piston, and the hydraulic chambers. It is composed of an oil passage to be connected and an on-off valve as an orifice provided in the oil passage.

Further, both hydraulic chambers are provided with an outflow blocking check valve for blocking the outflow of pressure oil and an inflow blocking check valve for blocking the inflow of pressure oil, and the on-off valve serves as an oil passage for the outflow of both hydraulic chambers. It is provided at a connection position of an inflow passage connecting the check check valve for blocking and an outflow passage connecting the check valves for preventing inflow of the two hydraulic chambers.

The high damping addition device for structures according to claim 1 of the present application has the above-mentioned configuration, wherein the opening / closing valve is provided in the opening / closing valve with respect to a front pressure of the opening / closing valve generated according to a relative speed of the cylinder and the piston. It is characterized in that a spring is provided to keep the opening at an opening that gives a required damping coefficient.

In the structure high damping addition device according to claim 2 of the present application, in the above structure, the opening / closing valve has an inflow port and an outflow port on one end side of the valve body, and the inflow port is bypassed on the other end side. An on-off valve having a back pressure port connected to a port, on the back pressure port side of the valve body, connected to an accumulator, to the front pressure of the on-off valve generated according to the relative speed of the cylinder and the piston. The back pressure adjusting valve is a poppet valve having a conical valve body that moves accordingly.

[Action]

Hereinafter, the operation and principle of the high attenuation adding device according to the present invention will be described by practically corresponding reference numerals.

As shown in the conceptual diagram of FIG. 2, the high damping addition device 1 of the present invention is provided with hydraulic chambers 5 on the left and right of a double rod type piston 3 which reciprocates in a cylinder 2, and the left and right hydraulic chambers 5 are provided.
An opening / closing valve 6 as an orifice is provided in an oil passage connecting
The opening degree of the on-off valve 6 changes automatically, that is, passively according to the oil pressure of the oil passage generated by the relative speed of the cylinder 2 and the piston 3 by the configuration described in the section for solving the problem. It is supposed to do.

One of the cylinder 2 and the rod 4 is connected to one of the frame main body and the variable rigidity element of the structure, or one of the pair of variable rigidity elements, and the other is connected to the frame main body and the variable rigidity element, or the pair of variable rigidity elements. Connected to each other.

The damping force of the high damping addition device 1 is obtained as a resistance force substantially proportional to the square of the relative speed of the cylinder 2 and the piston 3 according to the opening degree of the on-off valve 6, and gives the maximum damping constant h to the frame. In the vicinity, the frame has a shorter natural period,
The damping constant h also gradually decreases.

The graph in Fig. 3 shows the characteristics of such a frame conceptually for five types of vibration levels (velocities v _{1 to} v ₅ ) from large vibration with an inter-layer amplitude of several cm to small vibration with an inter-layer amplitude of several mm. Where c is the damping coefficient of the coupling device, and h is the damping constant of the frame. As is clear from this graph, as the vibration level, that is, the relative velocity v increases, the damping coefficient c of the high damping addition device that gives the maximum damping effect becomes smaller.

 Table 1 summarizes this relationship.

From Fig. 3 and Table-1, in order to minimize the sway of the structure against earthquakes and winds (maximum damping constant h),
As the vibration increases, the damping coefficient c of the device 1 should be decreased. That is, as the vibration increases, the opening degree of the opening / closing valve 6 may be increased.

The present invention utilizes this frame characteristic and adjusts the damping coefficient of the device according to the vibration level so that the damping effect of the frame is maximized.
And the characteristic that an opening degree according to the relative speed of the piston 3 can be realized. That is, the orifice opening is automatically increased / decreased according to the increase / decrease of the relative speed, and adjustment is made to provide the required damping coefficient to obtain the largest damping effect. , It is possible to minimize the sway of the structure.

〔Example〕

 Next, the illustrated embodiment will be described.

FIG. 1 conceptually shows the installation of the high damping addition device 1 of the present invention in a structure. A frame main body 31 composed of columns 33 and beams 34, and variable rigidity elements incorporated in the frame 31 of each layer. The high damping addition device 1 is interposed between the inverted V-shaped brace 35 and the inverted V-shaped brace 35. When a structure vibrates in response to a vibration disturbance such as an earthquake or wind, the opening degree of the opening / closing valve 6 automatically changes according to the relative speed of the cylinder 2 and the piston 3 of the high damping addition device 1, and the optimum damping coefficient is obtained. c can provide the structure with the maximum damping force.

FIG. 4 is a circuit diagram of an embodiment of the high damping addition device 1 according to claim 1 of the present application, in which hydraulic chambers 5 are provided on the left and right of a double rod type piston 3 that reciprocates in a cylinder 2. , The flow of the pressure oil in the left and right hydraulic chambers 5 is adjusted by the opening degree of the opening / closing valve 6 as an orifice, and the piston 3
And a structure for adjusting a damping force with respect to relative movement of the cylinder 2.

One of the cylinder 2 and the rod 4 is connected to one of the frame main body and the variable stiffness element of the structure, or one of the pair of variable stiffness elements, and the other is connected to the frame main body and the variable stiffness element, or the pair of variable stiffness elements. Is connected to the other.

The left and right hydraulic chambers 5 are respectively provided with an outflow prevention check valve 7 for preventing the pressure oil from flowing out of the hydraulic chamber 5 and an inflow prevention check valve 8 for preventing the pressure oil from flowing into the hydraulic chamber 5. The outflow prevention check valves 7 are connected to the inflow passage 9, and the left and right inflow prevention check valves 8 are connected to the outflow passage 10.

The on-off valve 6 is provided in the flow path connecting the inflow flow path 9 and the outflow flow path 10, and the damping coefficient c of the device 1 can be adjusted by changing the opening degree of the on-off valve 6. .

FIG. 5 shows the structure of the on-off valve 6 in the embodiment of FIG. 4, in which the inlet port 13 and the outlet port 14 of the spool valve are shown.
A conical coil spring 12 which is a non-linear spring for the valve body 11 that closes the gap.
Is provided to counter the inflow pressure (front pressure) on the inflow port 13 side.

As is apparent from the above-mentioned configuration, in this embodiment, the pressure oil always flows from the lower side of the on-off valve 6 regardless of whether the piston 3 moves to the left or right, and by the hydraulic pressure from the inflow port 13, The valve body 11 is pushed up, and the pressure oil flows out to the outflow port 14.

That is, by controlling the amount of movement of the valve body 11 according to the inflow pressure by the non-linear spring 12, it is possible to apply an optimum damping force to the frame. Table 2 shows this relationship.

FIG. 6 shows a circuit diagram of an embodiment of the high damping addition device 1 according to claim 2 of the present application. The basic structure is the same as that of the embodiment of FIG. As for the on-off valve 20 as described above, the back pressure port 25 connected to the accumulator 28 is provided on the side opposite to the inflow port 23 of the valve body 21.
Is provided. This back pressure port 25 is also connected to the inflow port 23 side by a bypass 26, and the accumulator 28
The back pressure is adjusted by the back pressure adjusting valve 27 interposed between the back pressure adjusting valve 27 and the back pressure adjusting valve 27, and thereby the opening degree of the on-off valve 20 is adjusted. The back pressure adjusting valve 27 is a poppet valve having a conical valve body 29 as shown in FIG. 7, and is a back pressure adjusting valve depending on the front pressure of the on-off valve 20.
The valve body 29 of 27 moves in opposition to the pressure of the accumulator 28, and the back pressure is controlled. In this way, the opening degree of the on-off valve 20 can be given to the device 1 an optimum damping coefficient according to the vibration level, and the shaking of the structure can be suppressed.

FIGS. 8 to 15 show examples of application positions of the connecting device having the variable damping mechanism in the present invention to the structure frame.

In the example of FIG. 8, the high-damping addition device 1 is interposed between the column-beam frame as the frame body 31 and the inverted V-shaped brace 35 as the variable rigidity element.

In the example of FIG. 9, the high-damping addition device 1 is interposed between the column-beam frame as the frame body 31 and the frames 41 erected or hung from the upper and lower beams 34, and the moment as the variable rigidity element. This is a case where a resistance frame is configured.

In the example shown in FIG. 10, the high-damping addition device 1 is provided between the column-beam frame as the frame body 31 and the RC seismic wall 42 as the variable rigidity element.
Is intervening.

The example of FIG. 11 is an example of the case where the high damping addition device 1 is provided in combination with the seismic isolation rubber 43 such as laminated rubber at the base of the seismic isolation structure. It plays the role of a damper. The variable stiffness element in this case can be considered the basis of the structure.

In the example of FIG. 12, the X-type brace 44 provided in the column-beam frame as the frame body 31 is used as a variable rigidity element, and the high damping addition device 1 is laterally (horizontally) interposed in the center of the X-type. .

The example of FIG. 13 is an example applied to the X-type brace 45 similarly to the example of FIG. 12, and the example of FIG. 12 is the horizontal type in which the high attenuation adding device 1 is provided sideways, whereas in the example of FIG. The high-damping addition device 1 is provided vertically, and is of a vertical type.

The example of FIG. 14 is similar to the example of FIG. 10 in that the high damping addition device 1 is interposed between the column beam frame as the frame body 31 and the RC seismic wall 46 as the variable rigidity element. It is characterized in that the high attenuation adding device 1 is provided above the opening 47 such as the entrance and exit.

In the example of FIG. 15, the high damping addition device 1 is interposed in the center of the X-shaped brace 48 in the large frame.
And brace 48 are separated.

〔The invention's effect〕

The high damping addition device of the present invention, when interposed between the frame main body and the variable rigidity element or the like, provides an on-off valve as an orifice provided in an oil passage connecting the hydraulic chambers on both sides of the piston, On the other hand, since a spring or a back pressure adjusting valve that keeps the on-off valve at an opening that gives the required damping coefficient is provided, the damping coefficient of the device depends on the relative speed of the cylinder and piston, that is, the vibration level of the structure due to vibration disturbance. Automatically changes in response to changes in the connection state between the variable stiffness element and the device. Therefore, by setting the spring or the back pressure adjusting valve, it is possible to provide the optimum damping property according to the characteristics of the structure. As a result, the response amount of the structure can be reduced, safety can be ensured, and a comfortable living space can be realized.

Further, since the device of the present invention operates by the vibration of the structure and provides a passive vibration control mechanism that does not require the control of a computer or the like, the design and adjustment according to the characteristics of the structure at the time of installation can be performed. It requires only a complicated control system and ancillary equipment, and can be installed at a lower cost than active damping systems.

[Brief description of drawings]

FIG. 1 is a schematic diagram of an example of installation of a high attenuation adding device of the present invention on a structure, FIG. 2 is a conceptual diagram of the device of the present invention, and FIG. 3 is a characteristic of a frame when the device of the present invention is installed. FIG. 4 is a hydraulic circuit diagram in an embodiment of the invention according to claim 1 of the present application, FIG. 5 is a cross-sectional view showing the structure of an on-off valve used in the embodiment of FIG. 4, FIG. 6 is a hydraulic circuit diagram in an embodiment of the invention according to claim 2 of the present application, FIG. 7 is a sectional view showing the structure of a back pressure regulating valve used in the embodiment of FIG. 6, and FIGS. FIG. 15 is a schematic diagram showing an example of a specific application position of the high damping addition device of the present invention to a structure frame. 1 ... High damping addition device, 2 ... Cylinder, 3 ... Piston, 4 ... Piston rod, 5 ... Hydraulic chamber, 6 ... Open / close valve, 7 ... Outflow prevention check valve, 8 ... Inflow prevention Check valve, 9 ... Inflow channel, 10 ... Outflow channel, 11
…… Valve, 12 …… Spring, 13 …… Inflow port, 14 …… Outflow port, 20 …… Open / close valve, 21 …… Valve, 23 …… Inflow port, 24 …… Outflow port, 25 …… Back Pressure port, 26 …… Bypass, 27 …… Back pressure control valve, 28 …… Accumulator, 29
...... Valve

Front page continued (72) Inventor Junichi Hirai 2-191-1 Tobita Supply, Chofu City, Tokyo Kashima Construction Co., Ltd. Technical Research Institute (72) Yoshinori Adachi 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Inventor Atsushi Atami 2-191-1 Tobita, Chofu City, Tokyo Kashima Construction Co., Ltd. Technical Research Institute

Claims (2)

(57) [Claims] 1. A frame body and a variable stiffness element of a structure, or a cylinder connected to one of a pair of variable stiffness elements provided in the frame body, the frame body and the variable stiffness element, or the pair of variable variables. A piston of a double rod type, which is connected to the other of the rigid elements and reciprocates in the cylinder, and hydraulic chambers provided on both sides of the piston,
An oil passage connecting the two hydraulic chambers and an on-off valve as an orifice provided in the oil passage, and an outflow prevention check valve for preventing the outflow of the pressure oil into the both hydraulic chambers, and an inflow of the pressure oil. An inflow blocking check valve for blocking is provided, and the oil passage is for an inflow passage connecting the outflow blocking check valves of the both hydraulic chambers and an outflow connecting the inflow blocking check valves of the both hydraulic chambers. A flow path, the opening / closing valve is provided at a position where the inflow passage and the outflow passage are connected to each other, and the opening / closing valve is provided in front of the opening / closing valve generated according to a relative speed of the cylinder and the piston. A high damping addition device for a structure, characterized in that a spring is provided for keeping the opening / closing valve at an opening that gives a required damping coefficient to the pressure. 2. A frame body and a variable stiffness element of a structure, or a cylinder connected to one of a pair of variable stiffness elements provided in the frame body, the frame body and the variable stiffness element, or the pair of variable variables. A piston of a double rod type, which is connected to the other of the rigid elements and reciprocates in the cylinder, and hydraulic chambers provided on both sides of the piston,
An oil passage connecting the two hydraulic chambers and an on-off valve as an orifice provided in the oil passage, and an outflow prevention check valve for preventing the outflow of the pressure oil into the both hydraulic chambers, and an inflow of the pressure oil. An inflow blocking check valve for blocking is provided, and the oil passage is for an inflow passage connecting the outflow blocking check valves of the both hydraulic chambers and an outflow connecting the inflow blocking check valves of the both hydraulic chambers. A flow path, the on-off valve is provided at a connection position of the inflow flow path and the outflow flow path, and the on-off valve has an inflow port and an outflow port on one end side of the valve body and the other end side. An opening / closing valve having a back pressure port connected to the inflow port by bypass, the opening / closing valve being connected to an accumulator on the back pressure port side of the valve body and generated according to the relative speed of the cylinder and the piston. Moves according to valve pre-pressure Conical valve body high damping additional device for structures, characterized in that a back pressure regulating valve comprising a poppet valve having a.