JPS63114771A - Variable rigid material of building housing - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] This invention relates to a variable stiffness member with respect to axial tensile force used in a building frame of a restraining structure. This system changes the rigidity of members in response to external forces such as earthquakes and wind that enter the building, allowing it to cope with earthquakes and the like.

[Conventional technology]

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

Earthquake resistance methods include seismic isolation construction or mounting 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, and walls. Or make a slit in the pillar etc.
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 buildings have a specific natural frequency, they do not allow resonance phenomena to occur against uncertain inputs such as earthquakes. You can't avoid it.

In contrast, in Japanese Patent Application No. 61-112026, the applicant changed the rigidity of the building itself to a method determined by a response prediction system based on the detected seismic motion, rather than using the passive seismic resistance method described above. We are proposing a power suppression method that ensures the safety of buildings, equipment inside buildings, occupants, etc. by creating a state with less resonance.

In the above electricity suppression method, a control device is installed in all or part of the pillars, beams, places, walls, and their joints, or between the building and the foundation or adjacent building, so that the connection state can be changed by computer commands. , perform power reduction in the building 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 between the fixed state and the disconnected state using hydraulic mechanisms, electromagnets, etc.

Those that are adjusted in the off state, the fixed state, the uncoupled state,
It is conceivable to use a hydraulic mechanism or a special alloy to adjust the introduction of tension force and fixation at an arbitrary position.

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]

The variable rigidity material of the building frame of the present invention is used in places, columns, etc. in the above-mentioned anti-static method to change the tensile rigidity in the axial direction so as to be able to cope with earthquakes and the like. Note that the present invention is not limited to use in the above-mentioned anti-static method, but can also be used to improve the above-mentioned method, or simply to change the rigidity.

[Structure of the invention]

The variable rigidity material of the present invention serves as a resistance member or a non-resistance member against tensile force in the axial direction in a building frame.

As shown in (b), the pieces la and lb are made up of two or more pieces la and lb, and with their ends butted against each other, the pieces la and lb are restrained by a restraining material 3 to resist tensile force, and the pieces la and lb are It is possible to release the restraint of lb and make it non-resistant to the tensile force.

The restraint member 3 is provided on one piece 1a and is operated by a drive device such as a servo motor or a pulse motor. The restraint method is to move the restraint member 3 parallel to the direction perpendicular to the axial direction of the piece 1a along the bolt 5 using a ball screw 6 provided on the restraint member 3, and to lock it at the ends of the opposing pieces la and lb. Possible methods include engaging or disengaging the protrusions 2a and 2b at the same time. Further, it is desirable to connect the pieces la and lb using a connecting material 4, such as a steel bar, whose tensile rigidity is sufficiently lower than that of the pieces la and lb so that the axes do not shift even if the pieces la and lb are separated. In that case, the connecting members 4 are provided on two opposing faces of the variable rigidity member 1 so as not to be eccentric.

A drive device such as a servo motor can be operated by a computer control program. In other words, rigidity can be controlled using a computer in response to vibrational external forces such as earthquakes, and resonance can be achieved by changing the natural period of the building as a whole by changing the rigidity and connection state of members in each part of the building. can dodge.

〔Example〕

Next, the illustrated embodiment will be described.

FIGS. 2(a) to 2(d) show an embodiment of the present invention, in which one structural member is divided into pieces 1a and 1b, and connected by a connecting member 4 with low tensile rigidity such as a steel bar. . In the figure, 7a and 7b are mounting flanges for attaching the connecting member 4 to both sides of the pieces la and lb.

Each of the pieces la and lb has locking protrusions 2a and 2b protruding from two opposing surfaces, respectively, to which the resistance force of the cross section of the member can be transmitted. A restraining member 3 that can simultaneously engage with the locking protrusions 2a and 2b of these pieces la and lb is provided on each surface, and is movable in a direction perpendicular to the material axis of the variable rigidity member 1. It comes into contact with and separates from the protrusions 2a and 2b. When they come into contact, the restraining material 3 is able to resist the tensile force in the axial direction by pulling the respective locking protrusions 2a and 2bK,
When separated, the restraining material 3 cannot resist the tensile force, and only the connecting material 3 provides resistance. Note that the tensile rigidity of the connecting member 3 is sufficiently smaller than that of the pieces la and lb of the main body of the variable rigidity member 1.

To move the restraint material 3, move the nut part of the ball screw 6 to the restraint material 3.
This is done by rotating the bolt 5. In this embodiment, a bolt 5 is provided at the center of the cross section of one piece 1a, and is rotated via gears 9a and 9b by the rotation of a computer-controlled rotor 8. The bolt 5 is rotatably supported by a support stand 10 and a support 11 fixed to the piece 1a, and the respective restraining members 3 provided on two sides sandwiching the piece 1a have opposite threads. As a result, the two restraining members 3 move symmetrically at the same time with one motor rotating 80 times. Restraint material 3 is bolt 5
Stability is good if the shape is symmetrical. Further, in this embodiment, a slider 12 is provided on the piece 1a side of the restraint material 3, and is slid along a rod-shaped guide member 13 that passes through the piece 1a, so that the restraint material 3 is prevented from rotating.

Figures 3 and 4 show modified examples of the drive mechanism, and the example shown in figure 6 has a bolt 5.
FIG. 4 shows the case where the support 11' of the bolt 5 is directly attached to the piece 1a without providing a support. In the figure, 14 is a stopper that restricts the movement of the restraint material 3.

FIGS. 5(a) to 5(d) show another embodiment in which the driving mechanism is provided on the side of the piece 1a. That is, there is a bolt 5 and a tight piece 1a of a ball screw 6 for moving the restraint member 3 in parallel, and a slider 12' provided on the side of the restraint member 3, and a guide member 13' and a slider 12' fixed to the restraint member 3 on the opposite side. The motor 8 is supported by a bracket 15 projecting to the side of the piece 1a, and rotates the bolt 5 via gears 9a and 9b. In Figs. 5 (a) to (d), the ball screw 6
Another method is to provide the motors 8 on both sides of the piece 1a and synchronize the motors 8 to operate the restraining material 3.

Figure 6 shows an example of application to the place of a building frame, where the piece la of the variable rigidity member 1 is restrained by the restraining material 3.
, when lb is restrained, like a normal place,
Axial compressive force.

While the structure is capable of resisting tensile force, when the restraining material 3 is released, the structure becomes unable to resist tensile force, and the rigidity of the entire building changes.

Figures 7 (a) and (b) show the axial force column 16 on the lowest floor of the building.
This is an example of the case where the variable rigidity member 1 of the present invention is used as an earthquake pillar on both sides of the
The rigidity can be changed in response to an earthquake or the like by releasing one of the restraints or shifting from the restraint-released state to the restraint state as shown in FIG. 7(b). In the figure, 17 is a place or a shear wall.

Figures 8 and 9 show an embodiment in which the rigidity is variable with respect to the tensile force in the axial direction, and the rigidity is variable with respect to the compressive force in the axial direction, and is applied to a place. That is, piece 1 b' and piece IC' (Fig. 8) of variable rigidity member 1' or piece 1 a/ and piece 1
b' (Fig. 9) are connected with a bottle 2], and a restraining member n extending from one piece restrains or releases the rotation of the other piece to resist (when restrained) the compressive force, or to resist the compressive force. It is possible to have no resistance (when the restraint is released). In the example shown in Fig. 8, the variable stiffness material 1' is made up of three pieces 1 a' I 1
b' t 1 e', the restraining material 3 moves in parallel in the plane between piece 1 a/ and piece 1 b/ so as to have variable rigidity against the tensile force, and piece IW and piece IC
A bottle 21 is provided that can rotate within a plane so as to have variable rigidity against a tensile force between 1 and 2. On the other hand, in the example shown in FIG. 9, the variable rigidity member 1' is composed of two pieces 1a' and 1b', the restraining member 3 related to tensile force is moved in an out-of-plane direction, and the portion 21 related to compressive force is made to move in the out-of-plane direction. is considered a loose ball.

Fig. 10 (a) and (b) show the case where the variable rigidity material 1' is also used as a pillar for axial force, and Fig. 10 (a) shows the case where the variable rigidity material 1' is used as a column for axial force.
The state where the book is resisting both compressive force and tensile force, Fang 1
Figure 0 shows a state in which the axial force column on the left side of the figure can resist tensile force but not compressive force, and a condition in which the right side column can resist compressive force but not tensile force. , the stiffness of each column and the entire building can be changed depending on the individual earthquake.

〔Effect of the invention〕

■ Pieces that make up a member can be connected or disconnected, and the rigidity of the member can be changed in response to tensile force in the axial direction.

■ By controlling changes in the rigidity of variable-rigidity materials used in building frames using computers, etc., it is possible to vary the building's natural period according to individual seismic characteristics and suppress large deformations of the building due to resonance phenomena. .

■ By using a computer-based anti-static method, a comfortable living space with no resonance and less shaking can be created.

[Brief explanation of the drawing]

Figures 1 (a) and 1 (b) are longitudinal cross-sectional views in a restrained state and a restrained state showing the basic structure of the present invention, respectively.
Figures (a) to (d) are a plan view, a front view, an II sectional view, and a ■-n sectional view, respectively, showing one embodiment of the present invention.
Figures 6 and 4 are longitudinal cross-sectional views showing modified examples of the drive mechanism, respectively, and Figures 5 (a) to (d) are plan views, front views, and 1-11 cross-sectional views showing other embodiments. , and IV-IV
Cross-sectional view, Fang 6 is a front view showing application to place, Fang 7
Figures (a) and (b) are front views when applied to an axial force column at the bottom of a building, and Figures 8 and 9 show that the rigidity is variable for both tensile force and compressive force in the axial direction. Front view showing an example of application to a place in a case, FIG. 10(a)
. (b) is a front view when similarly applied to an axial force column. 1...Variable rigidity material, la, lb...piece, 2a, 2b...locking protrusion, 3...
...Restraint material, 4...Connection material, 5...Bolt, 6...Ball screw, 7a, 7b...
...Mounting flange, 8...Motor, 9a,
9b...Gear, 10...Support stand, 11
...Support, 12...Slider,
13... Guide member, 14... Stopper, 15... Bracket, 16...
Axial force column, 17...Place or shear wall, 2
1...Bin, η...Restraint material Fig. 6 Fig. 7 (a) (b) Fig. 8 Fig. 9 Fig. 10

Claims (6)

[Claims] (1) An elongated member consisting of two or more pieces, in which a restraining member that can simultaneously engage and disengage from opposing connecting ends of the pieces is attached to one of the opposing pieces by the operation of a drive device. A variable rigidity member for a building frame characterized by the provision of a variable rigidity member. (2) The variable rigidity member for a building frame according to claim 1, wherein the connecting end of the piece is provided with a locking protrusion that engages with a restraining member. (3) The variable rigidity member for a building frame according to claim 1 or 2, wherein the locking protrusions are provided on two opposing surfaces of each piece. (4) The variable rigidity member for a building frame according to claim 1, wherein the restraint member is movable in a direction perpendicular to the axial direction of the piece by the operation of a drive device. (5) The variable rigidity member for a building frame according to claim 1, wherein the ends of the opposing pieces are connected by a connecting member in the axial direction of the piece whose tensile rigidity is sufficiently smaller than that of the piece. (6) The variable rigidity member for a building frame according to claim 5, wherein the connecting member is a steel bar.