JP6300516B2 - Damping structure - Google Patents

Description

  The present invention relates to a vibration control structure in which a natural period is made longer by reducing the rigidity of a building by forming joints with rubber having a low horizontal rigidity interposed in a part of a column.

  In order to ensure the safety of a building against earthquakes, acceleration is achieved by extending the natural period of the building to a longer period by installing seismic isolation devices using laminated rubber on the foundation and intermediate floor pillars. Seismic isolation structures that reduce response are in practical use.

  In the above seismic isolation structure, when the earthquake occurs, the response acceleration of the building is reduced to reduce the vibration that is about to propagate from the ground to the building. On the other hand, it can prevent toppling, etc., but the response amplitude of the seismic isolation device is large. It is necessary to adopt a flexible structure.

In addition, since it is necessary to secure a space such as a seismic isolation pit for installing the seismic isolation device, there is a problem that the construction cost increases as a whole.
Therefore, the applicant previously described in Patent Document 1 below, as shown in FIG. 7, a part of a column 30 made of reinforced concrete or the like has a rigidity lower than that of concrete and a large allowable shear deformation amount, such as rubber. We proposed a building with joints 31 made of materials.

  According to the above building, the horizontal rigidity of the column is reduced by the joint 31 made of a material such as rubber, so that the natural period of the building can be extended and the dynamic load applied to the building during an earthquake is reduced. On the other hand, since the interlayer displacement is suppressed to less than 1/50 or less than 1/100 of the floor height, it is possible to suppress the fall of furniture and the like, and to allow deformation of equipment piping, stairs, etc. There is an effect that a special structure is not required.

JP 2009-256962 A

  However, in buildings with a large aspect ratio, a tensile force acts on the column during an earthquake, so joint materials such as rubber with low resistance to tensile force cannot be used, and it is difficult to apply the above configuration. There is a problem.

  For this reason, although a method of passing a reinforcing bar that transmits tensile force through the joint 31 and passing through the upper and lower pillars can be considered, there is a possibility that the reinforcing bar may be damaged by a large horizontal displacement occurring in the joint 31 during an earthquake. Therefore, the improvement was requested.

  The present invention has been made in view of the above circumstances, and even for a building having a large aspect ratio, by providing joints using joint materials such as rubber having low resistance to tensile force on the pillars, the pillars can be leveled. An object of the present invention is to provide a seismic control structure capable of reducing the rigidity and extending the natural period of the building.

In order to solve the above-described problem, the invention according to claim 1 is a seismic control structure in which a joint material having a rigidity lower than that of the pillar is interposed in the pillar, and an upper pillar and a lower part sandwiching the joint material therebetween. A shaft portion whose base end portion is fixed to the end surface and extends in the vertical direction on one end surface of the column on the side, and a head portion having a larger diameter than the shaft portion formed at the tip of the shaft portion. A second engaging member having a receiving member disposed in the horizontal direction and having a hole formed in the center thereof on the other of the upper column and the lower column. The shaft portion is inserted into the hole portion of the receiving member so as to be relatively displaceable in the horizontal direction, and the outer diameter of the head portion is formed smaller than the inner method of the hole portion, and Between the head and the receiving material, a first annular plate whose inner diameter is smaller than the outer diameter of the head, By diameter is smaller than the outer diameter of the first annular plate, and the outer diameter is larger than the clear width of the hole portion and the second annular plate is interposed, the first and The second engaging member allows the relative displacement of the upper and lower columns in the horizontal direction and the approaching direction, and when a tensile force acts on the column, the head engages with the receiving member and It arrange | positions so that a tensile force may be transmitted, It is characterized by the above-mentioned.

According to the first aspect of the present invention, a joint material having rigidity lower than that of the pillar is interposed in the pillar, and the upper and lower pillars sandwiching the joint material between the horizontal direction and the approach of the upper and lower pillars. Since the first and second engaging members that allow relative displacement in the direction are arranged, the horizontal rigidity of the column is reduced, and the natural period of the building is prolonged, so that the building at the time of the earthquake occurrence The response acceleration can be reduced.

  In addition, since the first and second engaging members are arranged so as to engage with each other and transmit the tensile force when a tensile force is applied to the column, in a building having a large aspect ratio. In addition, a material having low resistance to tensile force such as rubber can be used as the joint material.

It is a perspective view of the important section showing one embodiment of the damping structure concerning the present invention. It is the longitudinal cross-sectional view of FIG. 1 before construction, and is the BB sectional view equivalent figure of FIG. It is the longitudinal cross-sectional view which looked at the side of FIG. It is the top view seen in the AA line of FIG. It is a longitudinal cross-sectional view which shows the state after the construction of FIG. It is a longitudinal cross-sectional view which shows the state after construction of FIG. It is a schematic block diagram which shows the vibration control structure by the conventional joint.

Hereinafter, an embodiment of a vibration control structure according to the present invention will be described based on the drawings.
The vibration control structure of this embodiment is obtained by interposing the joint device 1 shown in FIGS. 1 to 6 on the joint formed on the pillar 30 shown in FIG.
The joint device 1 is interposed in a joint formed on a pillar, and has a rectangular upper substrate 2 fixed to the end face of the upper pillar and a square lower substrate fixed to the end face of the lower pillar. 3 is filled with a joint material 4 in a prismatic shape or a cylindrical shape as shown in FIG. 1, and at the four corners between the upper and lower substrates 2 and 3 not filled with the joint material 4, An engagement member capable of transmitting a tensile force is arranged.

  Here, the upper and lower substrates 2 and 3 are rectangular steel plates formed in a shape equal to the cross section of the column through which the joint device 1 is interposed, and are respectively connected to the upper column and the lower column via anchor bolts 2a. It is fixed. Further, the joint material 4 is made of a material having lower rigidity than the column and a large allowable shear deformation amount, specifically, a rubber material, a polymer material such as an elastomer, or a composite material such as a fiber reinforced rubber, It is formed in a sheet shape having a thickness dimension of 100 mm or less, preferably 50 mm or less. The engaging member is arranged around the joint material 4.

  The engaging member includes a bolt (first engaging member) 5 fixed to the upper substrate 2, a receiving member (second engaging member) 6 fixed to the lower substrate 3, the bolt 5 and the receiving member. This is generally composed of two washers (first and second annular plates) 7 and 8 interposed between the members 6.

  The base 5 of the shaft 5a is fixed to the upper substrate 2 and the bolt 5 is vertically suspended with the head 5b positioned downward. Two washers 7 and 8 are externally mounted on the shaft portion 5 a of the bolt 5. Here, the washer (first annular plate) 7 on the side of the head 5 b is formed so that the inner diameter is smaller than the outer diameter of the head 5 b of the bolt 5, and is disposed on the upper part of the washer 7. The washer (second annular plate) 8 has an inner diameter smaller than the outer diameter of the washer 7. Accordingly, the washers 7 and 8 are disposed in a state of being locked to the head 5 b of the bolt 5.

  On the other hand, a rectangular plate-shaped receiving material 6 is provided above the bolts 5 and washers 7 and 8. The receiving member 6 has a hole 6a that is larger in diameter than the outer diameter of the head 5b of the bolt 5 and smaller in diameter than the outer diameter of the washer 8, and is positioned inward. These are fixed on the bottom plate 10 by wall portions 9 joined to the two sides. The bottom plate 10 is fixed to the corners of the lower substrate 3 with bolts 11. The receiving member 6 and the bottom plate 10 are divided into two in the diagonal direction of the receiving member 6 for the convenience of disposing and assembling the head 5b of the bolt 5 and the washers 6 and 7 below the receiving member 6. .

  Further, as shown in FIGS. 2 and 3, the receiving member 6, the bolt 5, and the washers 6, 7 are arranged at a position where the upper surface of the washer 7 is in contact with the lower surface of the receiving member 6 before construction. Then, as shown in FIG. 5 and FIG. 6, a slight gap is formed between the washer 7 and the receiving member 6 by compressing the joint material 4 in a state where the column load is applied after the construction. Arranged in a state.

  As a result, the shaft portion 5a of the bolt 5 is disposed so as to be relatively displaceable in the horizontal direction in the hole portion 6a, and the head portion 5b of the bolt 5 passes through the washers 6 and 7 when a tensile force acts on the column. As a result, the engaging member composed of the bolt 5 and the receiving member 6 allows relative displacement in the horizontal direction and the approaching direction of the upper and lower columns across the joint. In addition, when a tensile force is applied to the pillars, they are engaged with each other to transmit the tensile force.

  According to the vibration control structure having the above configuration, when a horizontal relative displacement occurs between the upper column and the lower column sandwiching the joint storage 1 during the earthquake, the shaft portion 5a of the bolt 5 is Along with the washers 7 and 8, they are relatively displaced in the horizontal direction in the hole 6 a of the receiving member 6 and follow this. Further, since the joint material 4 made of a rubber-based material having a lower rigidity and a larger allowable shear deformation amount is interposed in the column 30, the joint material 4 reduces the horizontal rigidity of the column. By extending the natural period of the building, the response acceleration of the building when an earthquake occurs can be reduced.

  Further, when relative displacement in a direction approaching each other occurs between the upper column and the lower column, the bolt 5 follows the displacement toward the bottom plate 10 side of the receiving member 6. On the other hand, when a tensile force acts on the column 30, the head 5 b of the bolt 5 is engaged with the receiving member 6 via the washers 7 and 8, thereby transmitting the tensile force to the lower column. .

  As a result, even in a building having a large aspect ratio, a material having low resistance to tensile force such as rubber can be used as the joint material 4.

4 Joint material 5 Bolt (first engaging member)
5a Shaft 5b Head 6 Receiving material (second engaging member)
6a hole 7 washer (first annular plate)
8 Washer (second annular plate)

Claims (1)

In the seismic control structure in which a joint material with a rigidity lower than that of the pillar is interposed in the pillar,
A shaft portion whose base end portion is fixed to the end surface and extends in the vertical direction is formed on one end surface of the upper column and the lower column sandwiching the joint material therebetween, and is formed at the distal end of the shaft portion. In addition, a first engaging member having a head having a diameter larger than that of the shaft portion is provided, and a hole is provided in the center portion and horizontally disposed on the other of the upper column and the lower column. A second engagement member having a formed receiving material is provided;
The shaft portion is inserted into the hole portion of the receiving member so as to be relatively displaceable in the horizontal direction, and the outer diameter of the head portion is formed smaller than the inner diameter of the hole portion, and the head portion and the receiving portion are formed. A first annular plate having an inner diameter dimension smaller than the outer diameter dimension of the head, and an inner diameter dimension smaller than the outer diameter dimension of the first annular plate, and the outer diameter dimension. By interposing a second annular plate having a diameter larger than the inner diameter of the hole, the first and second engaging members are displaced relative to each other in the horizontal direction and the approach direction of the upper and lower columns. Further, the vibration control structure is arranged such that when a tensile force acts on the column, the head is engaged with the receiving member to transmit the tensile force.

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