JPH01146080A - Variable rigid structure of building framing - Google Patents

Abstract

PURPOSE: To reduce response of a building by constituting connecting mechanism provided between an upper beam or a column and a wall raised from a lower beam or a floor slab, to control connection and separation by switching of electromagnetic force. CONSTITUTION: A reinforced concrete wall 3 is raised from a lower beam 2 of a column-beam frame face surrounded by right and left columns 1 and upper and power beams 2, separately from the columns 1 and the upper beam 2. Connecting mechanism 4 based on electromagnetic force and a displacement sensor 7 are interposed between the upper beam 2 and the wall 3. An input earthquake is analyzed by a computer or the like, and the actual displacement of the frame is detected by the sensor 7 to actuate an electromagnet 5, thus controlling connection and separation between the upper beam 2 and wall 3. The response of a building can therefore be reduced.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to a variable rigidity structure for a building frame, which changes the rigidity of the building frame in response to external forces such as earthquakes and wind that are input to a building with a restraining structure. The purpose is to enable people to deal with earthquakes, 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 or attenuation 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 columns. etc. with slits,
There are methods to adjust the rigidity of a building to its optimum level.

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.

In addition, 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 is difficult to resist resonance phenomena against the uncertain human force of an earthquake. You can't avoid it.

In contrast, in Japanese Patent Application No. 61-112026, the applicant proposed that the rigidity of the building itself be changed based on the judgment of a response prediction system based on the detected seismic motion, instead of using the passive seismic resistance method described above. We are proposing an installation method that ensures the safety of the building, equipment inside the building, occupants, etc. by setting it outside the area or in a state with little resonance.

In the above installation method, a control device is installed in all or part of columns, beams, places, walls, and their joints, or between a building and a foundation or an adjacent building, so that the connection state can be changed by computer commands. , The building is installed as follows.

■ The occurrence of an earthquake is detected by earthquake sensing devices placed in both narrow and wide areas around buildings, and the observation data is transmitted to a computer 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.

■ For detected earthquakes, a computer determines the scale of the earthquake, analyzes its frequency characteristics, predicts the amount of response, etc., and determines whether or not building vibration should be controlled, and if so, the control amount to avoid resonance. , a judgment is made based on the one that provides the optimum stiffness (natural frequency) with a small amount of seismic response.

■ The computer's commands are transmitted to the control devices in each part of the building, and the control devices operate so that the building's stiffness reaches the optimal stiffness based on the computer's predictions. The connection state can be adjusted by turning the fixed state and uncoupled state on and off using hydraulic mechanisms, electromagnets, etc., or by applying tension or fixing at any position between the fixed state and uncoupled state using a hydraulic mechanism. Alternatively, it may be adjusted using a special alloy or the like.

In addition, vibration sensors placed inside the building can detect the amount of response in each part of the building and the actual vibration when control is performed, and this can be fed back to correct the control amount.

[Purpose of the invention]

In the above-mentioned installation method, the variable rigidity structure of the building frame of the present invention is used within the column-beam structure to change the state of connection between the shear wall and the beam or column, that is, to control the connection and separation. By changing the rigidity of the frame, the purpose is to reduce the response of the building and prevent earthquake damage to the building, as well as protect the people living inside and machinery and equipment from discomfort and vibration damage caused by earthquakes. This is what I did.

[Structure of the invention]

Hereinafter, an overview of the present invention will be explained using reference numerals in the drawings corresponding to the embodiments.

The variable rigidity structure of the present invention connects and disconnects the lower beam 2 or wall 3 raised from the floor slab with the upper beam 2 or column 1 by switching the connection mechanism 4 on and off using electromagnetic force. This enables control. Wall 3 in connected state
serves as a shear wall and increases the rigidity of the building frame; in the unconnected state, the wall 3 does not resist horizontal forces and the rigidity of the building frame decreases. Therefore, depending on the characteristics of the input earthquake,
The electromagnetic force can be electrically switched on and off to reduce the response of the building.

It is also possible to provide a plurality of connection mechanisms 4 using electromagnetic force so that various connection states can be selected. In addition, by appropriately placing them on multiple walls of a building, it is possible to control the rigidity of the building as a whole and freely adjust the natural frequency of the building.

〔Example〕

Next, the illustrated embodiment will be described.

FIG. 1 shows an embodiment of the present invention.

In this example, a reinforced concrete wall 3 is erected separately from the column 1 and the upper beam 2 from the lower beam 2 of the column-beam structure surrounded by the left and right columns 1 and the upper and lower beams 2. A connection mechanism 4 using electromagnetic force is provided between the beam 2 and the wall 3. In this example, an electrically controlled electromagnet 5 is attached to the bottom surface of the beam 2.
An iron plate 6 fixed to the top surface of the wall 3 by turning on and off
Connect and disconnect between. This connection mechanism 4 can analyze and control input earthquakes using a computer or the like. Furthermore, a displacement sensor 7 is installed between the beam 2 and the wall 3 to detect the actual displacement of the frame during an earthquake, and based on this, it is possible to control the electromagnetic force on and off. There is.

〔Effect of the invention〕

■ By controlling the connection mechanism using electromagnetic force between the wall and the beam or column, the wall can be made to function as an earthquake-resistant wall or not, and the deformation of the building frame can be freely controlled. can do.

■ By controlling the connection mechanism with a computer, etc., it is possible to control the deformation of the entire building according to individual seismic characteristics. This increases the safety of the building and creates a comfortable living space with less shaking.

[Brief explanation of the drawing]

FIG. 1 is a front view of a frame showing an embodiment of the present invention.

Claims (2)

[Claims] (1) A connection mechanism using electromagnetic force is provided between the wall raised from the lower beam or floor slab and the upper beam or column, and the connection between the wall and the upper beam or column is established by switching the electromagnetic force. A variable rigidity structure for a building frame, which is characterized by being able to control the connection and separation of (2) The variable rigidity structure of a building frame according to claim 1, wherein a plurality of connection mechanisms using electromagnetic force are provided for each wall of the building.