JPS62268478A - Earthquakeproof method of building - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention utilizes an earthquake observation network and a communication network during an earthquake to apply an excitation force in the opposite direction to a building to cancel input seismic motion according to commands from a control device. , relates to a vibration damping method for buildings that prevents damage caused by resonance phenomena, etc.

[Conventional technology]

Conventionally, in the seismic design of high-rise buildings and important structures, dynamic design has been performed to check safety by calculating the ground movement and building response during an earthquake.

Earthquake resistance methods include seismic isolation construction methods or electricity reduction construction methods in which laminated rubber bearings or dampers are interposed between the building and the foundation, methods that consume earthquake energy by destroying non-main building components, walls or pillars. etc. with slits,
There are methods to adjust the rigidity of a building to its optimum level.

In addition, the applicant previously disclosed in Japanese Patent Application No. 60-205041 that a trigger device that can be connected or released between a building and its ground foundation is controlled by using an earthquake observation network and a communication network. We have applied for a seismic isolation system.

[Problem that the invention seeks to solve]

By the way, confirmation of the safety of buildings designed using current seismic design methods in the event of an earthquake is based on the basic idea that the energy absorbed by the hysteresis characteristics associated with plasticization of the structure exceeds the seismic energy acting on the structure. However, this has the problem of reliability regarding the history loop characteristics.

Furthermore, with the exception of the above-mentioned application, all conventional methods provide a passive seismic structure against natural external forces such as earthquakes and wind, and because the building has a specific natural frequency, it cannot withstand the uncertain input of an earthquake. On the other hand, resonance phenomena cannot be avoided.

Rather than using the passive seismic resistance method described above, this invention applies an excitation force in the opposite direction to the building based on the judgment of the response prediction system based on the detected seismic motion, and suppresses resonance in the building and inside the building. The aim is to ensure the safety of equipment, residents, etc.

[Means for solving problems]

In the development method of this invention, an excitation device consisting of an additional mass and a drive mechanism that vibrates at a desired frequency according to commands from a control device is installed on top of a building or inside the building, and the building is developed in the following manner. .

■ Earthquake occurrences are detected by earthquake sensing devices placed in both narrow and wide areas around buildings, and observation data is transmitted to control devices via wired and wireless communication networks. Wide-area earthquake sensing equipment connects seismometers at existing earthquake observation points or specially installed equipment using micro-wires or telephone lines.

In addition, narrow-area earthquake sensing devices consist of seismometers installed around buildings or in the surrounding ground, and vibration sensors installed at the base of buildings or inside buildings, and the effects of wind force etc. are detected by vibration sensors inside buildings.

■ Regarding the detected earthquake, the control device's computer determines the scale of the earthquake, analyzes frequency characteristics, predicts the amount of response, etc., and determines whether or not the vibration of the building should be controlled, and if so, the amount of control. Calculate the number of images and direction in which the excitation force applied to the building by the vibration excitation device cancels the input seismic motion and the response of the building is minimized.

■ Send commands from the control device to the vibration device and apply vibration force to the building in accordance with the input seismic motion. This excitation force is sufficient as long as it suppresses the resonance of the building; for example, it applies equal and opposite forces at the natural frequency where resonance occurs.

The vibration device may be one in which an additional mass block supported by a roller support and connected to a part of the building frame via an elastic member such as a spring is vibrated by an actuator controlled by a control device.

Note that this invention does not preclude its use in combination with conventional seismic isolation construction methods and electricity reduction construction methods, and by using them in combination, safety and economic efficiency can be increased.

〔Example〕

Next, the illustrated embodiment will be explained.

Figure 1 shows an overview of this invention, which will be explained in conjunction with the block diagram in Figure 2.First, the seismometer 3a near the epicenter X of the seismic observation network located in a wide area, Earthquake motions sensed by a nearby seismometer 3b1 and a vibration sensor 4 installed inside the building 1 are input to the control device 2 (usually a computer installed inside the building 1).

If the control device 2 determines that the magnitude of the earthquake exceeds a certain allowable value based on the vibration acceleration, etc. of the earthquake, it measures acceleration, analyzes frequency characteristics, and performs predictive calculations of the building's vibration properties, displacement, etc. If a certain allowable value is exceeded, the control device 2 sends a command to the vibrating device 5, and the vibrating device 5 causes the building 1 to receive vibrations that are opposite to the earthquake input in accordance with the natural frequency at the predicted resonance point of the building 1. Gives a vibration in the direction,
Resonant components can be canceled out.

To give a numerical example, regarding seismographs 3a distributed over a wide area,
If the epicenter x1 seismometer 3a1 target building 1 are in a straight line and there is a distance of 50 km between them, it will take approximately 18.5 seconds from P wave detection to S wave operation, and approximately 18.5 seconds from S wave detection to S wave operation. There is a time of 12 seconds, and the control only needs to be completed within this time. Also, for the narrow-area seismograph 3b, if the distance from the epicenter X is 1100K, there is a time of about 12 seconds from P-wave detection to S-wave operation, and it would be best if the control command could be issued during this time.

Further, the actual response is sensed by the vibration sensor 4 inside the building 1, and is fed back for correction.

FIGS. 3 and 4 show an example of the vibration device 5 installed on the roof of the building 1. FIG.

That is, the additional mass block 7, which is slidably supported by a roller bearing 8, can be vibrated by a plurality of actuators 6 fixed to the building 1, and is kept neutral at 1° on the rising part of the rooftop. By connecting via a spring 9 and activating an actuator, vibrations are applied to the building from one rising portion. In addition,
In the figure, 10 is a hydraulic pump, 11 is a servo valve, and 12 is a stopper to prevent the displacement from becoming too large.

〔Effect of the invention〕

The controller's computer instantaneously judges data sensed by earthquake sensing devices placed in both narrow and wide areas, and based on the predicted response, applies vibrations to the building in the opposite direction to the seismic force, thereby canceling out resonance components. is possible,
Buildings and equipment within buildings, tailored to individual seismic characteristics,
Residents can work in peace, and work inside the building can be carried out peacefully.

Existing facilities can be used for the earthquake observation network and communication network, and facility costs can be reduced by sharing them among multiple buildings.

In addition, seismic observation networks, computer-based control equipment,
Since vibration devices and the like can be added later, it can also be applied to existing buildings.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing an overview of the invention, FIG. 2 is a block diagram, FIG. 3 is a front view showing an example of the vibration device, and FIG. 4 is a plan view. 1. Building, 2. Control device! a, 3b... Seismograph,
4. Vibration sensor, 5. Vibration device, 6. Actuator, 7. Additional mass, 8. Roller support, 9.
・Spring, 1o...Hydraulic pump, 11...Servo valve,
12...St.7 Nog - Figure 2 Earthquake Figure 4, 10

Claims (2)

[Claims] (1) A vibrating device consisting of an additional mass and a drive mechanism that operates at a desired frequency according to commands from a control device is installed on the top of the building or inside the building, and is placed around the building as well as in narrow and wide areas. an earthquake is detected by an earthquake sensing device, the observation data from the earthquake sensing device is input to the control device, the earthquake is analyzed by the control device, and the vibration excitation device is activated based on the obtained seismic response prediction. A method for damping vibrations of a building, characterized by applying an excitation force in the opposite direction to the building to cancel input seismic motion. (2) The vibration excitation device is supported by a roller support, and an additional mass block connected to a part of the building frame via a plurality of elastic members is actuated by a plurality of actuators fixed to the building and controlled by a control device. A method for damping vibrations of a building according to claim 1, which is a method for controlling vibrations of a building.