JP5059708B2 - Structural seismic control structure - Google Patents

Description

  The present invention relates to a connected seismic control structure in which structures having different seismic performance are connected by a variable damping device having a damping effect of shaking during an earthquake.

  In the combined seismic control structure that connects adjacent existing buildings with low seismic performance and existing or new buildings with higher seismic performance through an attenuation device, the above two buildings The damping device can efficiently absorb energy by using a large relative displacement generated between them. In addition, even when trying to control existing buildings with low seismic performance, it can be dealt with by construction outside the building, so there is little hindrance to normal use inside the building during the construction period. There is also an advantage.

Therefore, for example, in Patent Document 1 below, two oil dampers that absorb horizontal vibration are set as a set between two structures spaced apart in the horizontal direction by an expansion joint with respect to the main axis direction of the structure. A truss-type connection structure for structures with oil dampers has been proposed, characterized in that a plurality of sets of truss-types are straddled at different angles, and the damping performance for each principal axis direction of the structure can be adjusted. Yes.
Japanese Patent No. 3411449

  However, in the above truss type connection structure using oil dampers, when used for connecting buildings with low seismic performance and buildings with relatively sufficient seismic performance, the reaction force of the oil damper is non-linear during a large earthquake. There was a problem that excessive energy flowed to buildings with low seismic performance, which had become increasingly advanced, and as a result, the buildings were damaged early.

  The present invention has been made in view of such circumstances, and when the swing is small, it is possible to obtain an effective damping effect by utilizing the relative displacement generated between the two structures, and when the swing is large, the seismic performance is improved. It is an object of the present invention to provide a coupled vibration control structure for a structure that can preferentially reduce the response of shaking with respect to a structure having a low height.

  In order to solve the above-mentioned problem, the invention according to claim 1 connects the first structure and the second structure having a lower seismic performance than the first structure, and has two stages of damping coefficients. The variable attenuating device that can be switched as described above, the first sensor that detects the magnitude of shaking of the second structure or the ground, and the attenuation of the variable attenuating device based on the detection signal from the first sensor. Control means for controlling the coefficient, and the variable attenuation device is fixed to an attenuation coefficient capable of attenuating the shaking of both the first and second structures in a normal state, and the control When the first sensor detects a swing exceeding a preset level leading to damage to the second structure, the means determines the damping coefficient of the variable damping device and the swing of the second structure. Switch control to preferentially suppress It is characterized in.

  In addition, as a 1st sensor which detects the magnitude | size of the shake of a 2nd structure, it is installed in the damper of the said 2nd structure, its surrounding ground, or a variable damping device, The acceleration of the said location, speed, An acceleration sensor, a speed sensor, a displacement sensor, a strain sensor, an energy detection unit, and the like that measure displacement (interlayer displacement), strain, energy, and the like can be used.

  Corresponding to each sensor, the control means includes an acceleration value, a velocity value, an (interlayer) displacement value, which are considered to lead to damage of the structure, based on the degree of seismic performance of the second structure. Set the strain, energy value, etc.

  According to a second aspect of the present invention, in the first aspect of the present invention, the control unit continuously detects a force generated in the variable damping device, and the second structure. A third sensor that is installed on the floor where the variable attenuation device for the object is provided and continuously detects the response of shaking in the second structure, and the second and third sensors detect When it is determined that the force generated in the variable reduction gear acts as a damping force on the second structure based on the product of the sign of the direction, the damping coefficient of the variable damping device is set to be large and the second And the damping coefficient of the variable damping device when it is determined that the force generated in the variable speed reduction device acts as an excitation force on the second structure by the product of the signs of the directions detected by the third sensor. Set a smaller value More, is characterized in that to perform the switching control.

  Here, as the second sensor for continuously detecting the force generated in the variable damping device, a speed sensor, a displacement sensor, a pressure sensor, or the like that can detect the speed, displacement, or load generated in the variable damping device every moment. Can be used. Moreover, as a 3rd sensor which detects the response of the shake in a 2nd structure continuously, the acceleration sensor, speed sensor, etc. which are installed in the said 2nd structure and measure the acceleration or speed of the said location, etc. Can be used.

  On the other hand, according to a third aspect of the present invention, in the first aspect of the present invention, the control means includes a fourth sensor that detects a damage value or a swing response value of the second structure, The switching control is performed by setting the attenuation coefficient to be small step by step each time the detection value from the fourth sensor exceeds the preset damage level or the vibration response value in a plurality of stages. It is what.

  Here, as the fourth sensor for detecting the damage level of the second structure or the response value of shaking, a displacement meter or the like for measuring the interlayer displacement is suitable. In this case, the displacement angle 1/500 at which the crack starts to occur on the wall, the deformation angle 1/300 at which the structural housing starts to be damaged, etc. are set in advance as the above damage degree or the response value of the shaking. When the value is exceeded, the attenuation coefficient of the variable attenuation device is sequentially switched to a smaller value.

  Furthermore, the invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein a plurality of the variable damping devices are provided in the horizontal direction and the vertical direction between the first and second structures. Each variable attenuating device is individually controlled by the control means while being installed.

  According to the invention according to any one of claims 1 to 4, the first structure and the second structure having low earthquake resistance are connected via the variable damping device, and the variable damping is normally used. Since the apparatus is fixed to a damping coefficient capable of attenuating the vibrations of both the first and second structures, both structures against relatively small vibrations caused by strong winds, small earthquakes, etc. Can be efficiently reduced.

  Therefore, it is preferable that the damping coefficient in the variable damping device is set to an optimum value obtained from the mass ratio and the frequency ratio of the structure or a value in the vicinity thereof.

  When the first sensor detects a shake exceeding a level that leads to damage of the second structure set in advance during a large-scale earthquake, the control means sets the attenuation coefficient of the variable attenuation device to the second structure. Since the switching control is performed so as to preferentially suppress the shaking of the object, the response of the second structure is continuously prioritized even when the vibration characteristics change due to the non-linearization in the second structure. Can be reduced to prevent large damage from occurring at an early stage.

  Further, as in a fourth aspect of the invention, a plurality of the variable attenuation devices are installed in the horizontal direction and the vertical direction between the first and second structures, and each variable attenuation device is controlled by the control means. If individually controlled, the layer in the second structure even when the second structure is originally biased in rigidity or proof stress as a structure or when the above-described bias occurs after non-linearization. It is possible to efficiently suppress collapse and increase of torsional vibration.

1 to 4 show a first embodiment of a coupled vibration control structure for a structure according to the present invention, and FIGS. 5 to 11 show second to eighth embodiments, respectively. .
In FIG. 1 to FIG. 4, reference numeral 1 is an existing or new building (first structure) having a relatively large margin of seismic performance, and reference numeral 2 is adjacent to the building 1 and more than the building 1. It is an existing building (second structure) with low earthquake resistance.

The buildings 1 and 2 are connected to each other via a plurality of variable attenuation devices 3 that can switch the attenuation coefficient to two or more levels.
Here, as the variable speed reducer 3, a damping coefficient control type such as a variable damping oil damper capable of switching the damping coefficient in a plurality of stages by opening / closing an electromagnetic valve as shown in FIG. A damping force control type such as an MR damper or an ER damper capable of switching the damping force in a plurality of stages by changing the applied current as shown in (b) is applicable.

  The variable attenuator 3 is installed at each level of the buildings 1 and 2, and at each level, a plurality of variable attenuation units 3 are installed at intervals in the horizontal direction (see FIGS. 7 to 11). . Each of these variable damping devices 3 has its damping coefficient fixed at an optimum value A obtained from the mass ratio and the frequency ratio of the buildings 1 and 2 in normal times. As a result, when a normal or small-scale vibration occurs, the passive-type vibration attenuation effect is exhibited.

  The plurality of variable attenuators 3 are provided with control means 4 for individually controlling each variable attenuator 3, and the building 2 having a low seismic performance has a vibration exceeding a level that causes damage. In this case, the damping coefficient is controlled to be switched by each control means 4 so as to preferentially suppress the shaking of the building 2.

  That is, a damage detection sensor (first sensor) 5 is installed in the building 2. This damage detection sensor 5 is for detecting the magnitude of the vibration of the building 2 or the degree of non-linearity, and is an acceleration sensor that measures acceleration, speed, displacement (interlayer displacement), strain, energy, etc. at the installation location, A speed sensor, a displacement sensor, a strain sensor, energy detection means, or the like can be used. And the detection signal from this damage detection sensor 5 is sent to each control means 4.

  On the other hand, as shown in FIG. 4, each control means 4 includes a controller 6 to which a detection signal from the damage detection sensor 5 is input, and is sent to the controller 6 from the damage detection sensor 5 in advance. A level value that leads to damage of the building 2 corresponding to the coming detection signal is set.

  For example, when the damage detection sensor 5 detects acceleration, speed, or deformation (interlayer displacement), the level value of acceleration, speed, or deformation (interlayer displacement) that leads to damage to the building 2 is correspondingly detected. Is set. When the damage detection sensor 5 detects the periodic characteristic from acceleration or speed, the value of the periodic characteristic that leads to damage of the building 2 is set as the level value. Furthermore, when the damage detection sensor 5 is a strain sensor, a strain value that leads to damage to the building 2 at the location is set as the level value.

  The damage detection sensor 5 is not installed in the building 2 but installed in the variable attenuation device 3 to detect its load, or installed in the surrounding ground 7 of the building 2 and its acceleration and speed are measured. It is also possible to detect. In such a case, the load value in the variable damping device 3 that is considered to cause damage to the building 2 and the acceleration value of the ground 7 are set in the controller 6 as the level value.

  On the other hand, each variable damping device 3 is provided with a load sensor (second sensor) 8 that continuously detects the force generated in the variable damping device 3. Further, a speed sensor (third sensor) 9 for continuously detecting the speed at the installation location in the building 2 is provided in the hierarchy of the building 2 where each variable attenuation device 3 is installed. Detection signals from the load sensor 8 and the speed sensor 9 are input to the controller 6 of the control means 4.

  The controller 6 outputs a signal for switching the attenuation coefficient to the variable attenuation device 3. That is, the controller 6 preferentially suppresses the damping coefficient of the variable attenuating device 3 and the shaking of the building 2 when a detection signal of shaking exceeding the preset level value is input from the damage detection sensor 5. Is controlled to be switched.

  This switching control is based on the product of the direction of the force generated in the variable damping device 3 detected by the load sensor 8 and the sign of the direction of the speed of the building 2 detected by the speed sensor 9. If it is determined that the building 2 acts as a damping force, a signal for switching the damping coefficient of the variable damping device 3 to a large value B is output as shown in FIG.

  On the other hand, the force generated in the variable reduction gear 3 by the product of the sign of the direction of the force of the variable damping device 3 detected by the load sensor 8 and the direction of the speed of the building 2 detected by the speed sensor 9 is When it is determined that the variable damping device 3 acts as a vibration force, the force from the variable damping device 3 acts as a vibration force that excites the vibration to the building 2. A signal for switching to a small value C is output.

The switching control is not limited to that described above, and can be performed by other methods.
For example, a displacement meter (fourth sensor) is installed in the building 2 to measure the interlayer displacement and detect a response value of the degree of damage or shaking at the location. The displacement angle 1/500 at which cracks start to occur, the deformation angle 1/300 at which the structural housing starts to be damaged, etc. are set as the above damage degree or vibration response values (δ ₁ , δ ₂ etc.). It is also possible to adopt a method of switching the attenuation coefficient of the variable attenuating device to a smaller value when it exceeds the limit.

  As described above, according to the coupled vibration control structure of the buildings 1 and 2 having the above-described configuration, the buildings 1 and 2 are connected via the variable attenuator 3, and the attenuation coefficient of the variable attenuator 3 is set to be normal. Because it is fixed at the optimum value A obtained from the mass ratio and frequency ratio of buildings 1 and 2, the response of both buildings 1 and 2 to relatively small shaking caused by strong winds, small earthquakes, etc. Can be efficiently reduced.

  Then, in the event of a large-scale earthquake, when a shake exceeding a preset level value leading to damage of the building 2 is input from the damage detection sensor 5 to the controller 6, the attenuation coefficient of the variable attenuator 3 is set to the shake of the building 2. Since switching control is performed so as to suppress it preferentially, even when the vibration characteristics change due to the non-linearization in the building 2, the response of the building 2 is continuously reduced preferentially, and large damage occurs early. Can be prevented.

  In addition, since a plurality of variable attenuation devices 3 are installed in the horizontal direction and the vertical direction between the buildings 1 and 2, and each variable attenuation device 3 is individually controlled by the control means 4, Even when the structure has a bias in rigidity and proof stress, or when the bias occurs after non-linearization, an increase in the layer collapse and torsional vibration in the building 2 can be efficiently suppressed.

Next, second to eighth embodiments of the present invention will be described with reference to FIGS. In addition, about the same component as what was shown in FIGS. 1-4, the same code | symbol is attached | subjected and the description is simplified.
In the second embodiment shown in FIG. 5, instead of the load sensor (second sensor) 8 that continuously detects the direction of the force generated in each variable attenuating device 3, the variable attenuating device in the building 1 is used. A speed sensor (second sensor) 10 is installed in the hierarchy where 3 is provided. In place of the speed sensor 10, an acceleration sensor may be installed.

  In the second embodiment, in the controller 6, the direction of the difference between the speed of the building 1 detected by the speed sensor 10 and the speed of the building 2 detected by the speed sensor 9 and the speed of the building 2 detected by the speed sensor 9. If it is determined that the force generated in the variable speed reducer 3 acts as a damping force on the building 2 based on the product of the sign of the direction, the damping coefficient of the variable speed reducer 3 is switched to a large value B and conversely variable. When it is determined that the force generated in the reduction gear 3 acts on the building 2 as an excitation force, a signal for switching the attenuation coefficient of the variable damping device 3 to a small value C can be output.

In the third embodiment shown in FIG. 6, the variable attenuation device 3 is installed between the top floor of the building 2 and the building 1. Furthermore, reinforcement 11 is applied to the building 2 as necessary so as to withstand the reaction force from the variable damping device 3.
According to the third embodiment, since the variable attenuator 3 is installed on the top floor having a large deformation amount in the building 2, the efficiency of the variable attenuator 3 can be increased.

FIG. 7 shows a fourth embodiment in which the second embodiment is applied when there is no structural eccentricity in both buildings 1 and 2.
That is, in this coupled seismic control structure, one speed sensor (second sensor) 10 and speed sensor (third sensor) 9 are provided in each level of the buildings 1 and 2. Then, the response values detected by the speed sensors 10 and 9 are used as a value representative of the hierarchy, and the control means 4 as detection signals to a plurality of (four in the figure) variable attenuating devices 3 that connect the hierarchy. Have been entered. As a result, the variable attenuation devices 3 in the same hierarchy can be simultaneously switched based on the detection signals from the speed sensors 10 and 9.

In addition, the fifth to seventh embodiments shown in FIGS. 8 to 10 are applied when the building 1 has no eccentricity and the building 2 with low seismic performance has an eccentricity.
In each of the buildings 1, one representative speed sensor (second sensor) 10 is provided at each level.

In the fifth embodiment shown in FIG. 8, a load sensor (third sensor) 12 is provided in each variable damping device 3 of the building 2.
Thereby, in each hierarchy, the response value of the building 1 detected by the representative speed sensor 10 and the force generated in the variable damping device 3 detected by the load sensor 12 of each variable damping device 3 in the building 2. The torsional response can be suppressed by a small number of sensors as a whole by individually controlling each variable attenuating device 3 according to the direction.

  In the sixth embodiment shown in FIG. 9, a plurality of (two in the figure) speed sensors 9 representing the places that are considered to have the same response are provided in each level of the building 2. The response detected by the sensor 9 is input as a common value to the control means 4 of a plurality (two in the figure) of the variable attenuation device 3 in the vicinity of the place where the speed sensor 9 is provided.

Furthermore, in the seventh embodiment shown in FIG. 10, the variable damping device 3 is intensively arranged at a location where the rigidity in the building 2 is low, that is, a location where deformation becomes large.
Therefore, also in these embodiments, the torsional response in the building 2 can be efficiently controlled by a small number of sensors or the variable damping device 3.

In addition, the eighth embodiment shown in FIG. 11 shows a case where the building 1 and 2 are both eccentric. In this coupled vibration control structure, each variable attenuator 3 that connects each level is shown. On the other hand, a load sensor 8 and a speed sensor 9 for the building 2 are arranged.
As a result, by controlling each variable attenuator 3 individually, it is possible to suppress a fine torsional response.

  In the first to eighth embodiments, there are two buildings, an existing or new building 1 having a relatively large seismic performance margin and an existing building 2 having a lower seismic performance than the building 1. Although only the case where the buildings are connected has been described, the present invention is not limited to this, and the present invention can be similarly applied to a case where a plurality of buildings are connected.

  For example, as in the ninth embodiment of the present invention shown in FIG. 12, an existing building 2 having a low seismic performance is replaced with two existing or new buildings 1 having a relatively large seismic performance and a variable speed reducer. 3 for each building 1 that is structurally free from eccentricity, and a representative speed sensor 10 is provided for each of the buildings 1, and for the buildings 2 with eccentricity, the speed sensors 9 corresponding to the variable speed reducers 3 are provided. It is possible to adopt various forms, such as providing.

It is a schematic diagram which shows schematic structure and the effect | action of the 1st Embodiment of this invention. FIGS. 2A and 2B are diagrams illustrating a relationship between speed and damping force in the variable damping device 3 in FIG. 1, where FIG. 2A is a damping coefficient control type and FIG. 2B is a damping force control type. It is a front view which shows the whole structure in 1st Embodiment. It is a block diagram which shows the structure of the control means in 1st Embodiment. It is a front view which shows the whole structure of the 2nd Embodiment of this invention. It is a front view which shows the whole structure of the 3rd Embodiment of this invention. It is a top view which shows the 4th Embodiment of this invention. It is a top view which shows the 5th Embodiment of this invention. It is a top view which shows the 6th Embodiment of this invention. It is a top view which shows the 7th Embodiment of this invention. It is a top view which shows the 8th Embodiment of this invention. It is a top view which shows the 9th Embodiment of this invention.

Explanation of symbols

1 building (first structure)
2 Building (second structure)
3 Variable damping device 4 Control means 5 Damage detection sensor (first sensor)
6 Controller 7 Ground 8 Load sensor (second sensor)
9 Speed sensor (third sensor)
10 Speed sensor (second sensor)
11 Reinforcement material 12 Load sensor (third sensor)

Claims (4)

A variable damping device that connects the first structure and the second structure having a lower seismic performance than the first structure, and that can switch the damping coefficient in two or more stages, and the second structure or A first sensor for detecting the magnitude of ground shaking, and a control means for controlling the variable attenuation device based on a detection signal from the first sensor;
The variable attenuation device is fixed to an attenuation coefficient capable of attenuating the shaking of both the first and second structures in normal times, and the control means is configured to set the second structure in advance. When the first sensor detects a swing exceeding a level that leads to damage of the second damping mechanism, the damping coefficient of the variable damping device is controlled so as to preferentially suppress the swing of the second structure. Connected seismic control structure.   The control means is installed on a floor provided with the second sensor for continuously detecting the force generated in the variable damping device and the variable damping device for the second structure, and the second structure. A third sensor for continuously detecting a response of shaking in the object, and a force generated in the variable speed reducer by the product of the signs in the directions detected by the second and third sensors. When it is determined that it acts as a damping force on the structure, the damping coefficient of the variable damping device is set to be large, and the product of the sign of the direction detected by the second and third sensors determines the variable speed reduction device. The switching control is performed by setting the damping coefficient of the variable damping device to be small when it is determined that the generated force acts on the second structure as an excitation force. The structure described in Consolidated seismic control structure of things.   The control means includes a fourth sensor that detects a damage level of the second structure or a response value of shaking, and the detection value from the fourth sensor is a predetermined level of the damage level or a plurality of stages. 2. The coupled seismic control structure for a structure according to claim 1, wherein the switching control is performed by setting the attenuation coefficient to be small step by step every time a response value of shaking is exceeded.   A plurality of the variable attenuation devices are installed in the horizontal and vertical directions between the first and second structures, and each of the variable attenuation devices is individually controlled by the control means. A connected vibration control structure for a structure according to any one of claims 1 to 3.

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