JP5171115B2 - Building floor vibration countermeasures - Google Patents

Description

  The present invention relates to a tuned mass damper used for vibration suppression of a floor or the like.

  As countermeasures against floor vibrations in buildings, measures such as adding floor beams to receive floor panels, adding more floor panels to the floor panels, and installing tuned mass dampers by installing transfer materials on adjacent floor beams are taken. ing.

  The tuned mass damper suppresses the vibration of the object to be controlled by setting the same period as the vibration of the object to be controlled and resonating the vibration of the object to be controlled and the vibration of the mass. It is something to try.

JP 2001-165234 A

  However, when floor beams that receive floor panels are added as countermeasures against floor vibrations, or when the floor panel is added with a base layer, sufficient effects cannot be obtained when the floor panel damping is the cause of floor vibrations. Moreover, the measure to install a tuned mass damper by providing a passing material between floor beams requires a considerable space under the floor panel, which hinders the construction of glass wool and electrical wiring under the floor panel. In particular, when installing a tuned mass damper after handing over the building, it will be a very large construction.

  An object of the present invention is to provide a tuned mass damper for floor vibration countermeasures that secures the rigidity of a floor beam of a building, improves the feeling of deflection, and at the same time improves the dampening and improves the comfortability.

  The above problem is solved by a tuned mass damper, in which a beam that supports the floor is provided with a rigid reinforcing body, and the rigid reinforcing body is provided with a mass via a viscoelastic material.

  According to this tuned mass damper, the beam supporting the floor is equipped with a stiffening reinforcement, so that the moment of inertia of the beam is improved, the deflection of the beam due to the increased rigidity of the beam is improved, and floor vibration is reduced. Reduced.

  Moreover, since the rigid reinforcement body is provided with a mass via a viscoelastic body, the rigid reinforcement body functions as a tuned mass damper, the floor vibration is attenuated, and the floor vibration can be effectively reduced.

  In addition, the above-mentioned problem is characterized in that a hollow rigid reinforcing body is provided at the lower end of the beam supporting the floor, and a mass is provided inside the hollow rigid reinforcing body via a viscoelastic material. It is also solved by a tuned mass damper.

  This tuned mass damper has a structure with a hollow rigid reinforcement at the lower end of the beam that supports the floor. The cross-sectional secondary moment can be improved, the rigidity of the beam can be improved, and the mass is provided through the viscoelastic material inside the hollow rigid reinforcement body, so that the cross-sectional secondary moment is improved and the inner By effectively utilizing the space, a tuned mass damper can be formed.

  In the tuned mass damper, a plurality of rigid reinforcing bodies may be provided intermittently with respect to the beam.

  By providing multiple rigid reinforcements intermittently to the beam, it is possible to effectively provide the rigid reinforcement to the beam while avoiding obstacles under the beam, and the cross-sectional moment of the beam is improved. The deflection of the beam due to the improved rigidity of the beam is improved, and the floor vibration can be reduced.

  Since the present invention is as described above, it is possible to realize a tuned mass damper for floor vibration countermeasures that secures rigidity and improves flexibility while improving damping and improving habitability.

  Next, the best mode for carrying out the present invention will be described with reference to the drawings.

  In the tuned mass damper 1 attached to the beam shown in FIG. 1, 2 is an H-shaped steel made up of an upper flange 2a and a lower flange 2b that support the floor, and a web 2c that connects them, and 3 is a hollow made up of a rectangular frame in cross section. 4 is a viscoelastic material, 5 is a mass, and 6 is a bolt and nut as a fastening material for fixing the rigid reinforcement 3 to the lower flange 2b. In addition, 7 is a floor board and 8 is a breath.

  The rigid reinforcing member 3 is integrated with two groove members 3a and 3b having different width dimensions with the opening sides facing each other. A mass 5 is fixed via a viscoelastic body 4 to the groove member 3b located on the lower end side. The rigid reinforcing body 3 having the mass 5 fixed on the inside via the viscoelastic body 4 is formed of bolts and nuts through bolt insertion holes drilled in the groove member 3a and the lower flange 2b of the beam 2, respectively. It is fixed to the beam 2 by a fastening member.

  The beam 2 to which the rigid reinforcement body 3 is attached has an improved second moment of section in comparison with the H-shaped steel made up of the upper flange 2a, the lower flange 2b, and the web 2c connecting them, and the rigidity as a beam supporting the floor is improved. To do. The deflection of the beam due to the improved rigidity of the beam is improved, and floor vibration can be reduced.

  Further, since the mass 5 is attached to the inside of the rigid reinforcing material 3 via the viscoelastic body 4, the vibration period of the mass 5 is matched with the vibration period of the beam 2, By resonating the vibration of the beam 2, the vibration of the beam can be suppressed, the viscoelastic body 4 functions as a damping material that absorbs energy, and the rigid reinforcing material 3 functions as a tuned mass damper.

  In particular, when installing a tuned mass damper with a passing material between floor beams, a considerable space is required under the floor panel, which hinders the construction of glass wool and electrical wiring under the floor panel. In the tuned mass damper 1, a tuned mass damper can be configured simply by attaching a rigid reinforcing material under the beam, and this can be realized in a small space. In particular, when a tuned mass damper is additionally installed as a countermeasure against floor vibration after delivery of the building, the installation of the tuned mass damper can be realized without a large-scale construction.

  Although the embodiment of the present invention has been described above, the present invention is not limited to this, and various modifications can be made without departing from the spirit of the invention. For example, in the above-described embodiment, the case where the rigidity reinforcing material is attached to a part of the beam has been described. However, a plurality of rigidity reinforcing materials may be intermittently attached along the beam, or the rigidity reinforcement having the same dimensions as the beam. Needless to say, the material may be attached.

  Further, in the above embodiment, the case where the rigid reinforcing material is fastened to the lower flange of the beam with the bolt and nut is shown, but there is no limitation on the mounting method of the rigid reinforcing material, and it may be attached using a fixing bracket, Other methods such as welding may be used.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows embodiment of this invention, Comprising: (a) is a front view which shows a tuned mass damper, (b) is an AA line of the figure (a) which shows the attachment condition to the beam of a tuned mass damper A cross-sectional arrow view and FIG. (C) are front views showing a state in which the beam supports the floor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Tuned mass damper 2 ... Beam 3 ... Rigid reinforcement body 4 ... Viscoelastic body 5 ... Mass

Claims (2)

At the lower end of the beam that supports the floor, two groove members with different width dimensions are respectively attached to the inner surface of the groove member located on the lower end side of the hollow rigid reinforcing member integrated with the opening side facing each other. A method for countermeasures against floor vibrations in a building, in which a tuned mass damper provided with a mass via an elastic material is additionally installed later as a countermeasure against floor vibrations after delivery of the building. The building floor vibration countermeasure method according to claim 1 , wherein the rigid reinforcement is provided intermittently with respect to the beam .

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