JP4860938B2 - Vibration control structure - Google Patents

Description

  The present invention relates to a vibration damping structure used for a brace connecting portion or the like.

  For example, in a building such as a house with a brace type bearing wall, when an earthquake occurs, the brace will endure the horizontal force and try to protect the building, but if the horizontal force exceeds a certain limit, the brace There is a problem that it is surrendered and its repair is troublesome.

  For this reason, it is preferable to adopt a vibration damping structure that absorbs energy before the brace yields, but no vibration damping structure that can effectively achieve this with a simple structure has yet been provided.

  In the technical background as described above, the present invention provides a vibration damping structure that can effectively absorb energy before others yield, and that can be realized with a simple structure. The issue is to provide.

  The above problem is that the core rod is passed through the cylinder for energy absorption, and a compression force acts on the cylinder, so that the cylinder is shortened and the inner peripheral side is supported by the core rod so that it is intermediate in the axial direction. This is solved by a vibration damping structure characterized in that the peripheral wall of the portion bulges outward and undergoes plastic deformation and absorbs energy.

  This damping structure has a structure in which a core rod is passed through an energy absorbing cylinder. When a compression force is applied to the cylinder, the cylinder is shortened and the inner periphery is supported by the core rod. The operation in which the peripheral wall of the intermediate portion in the axial direction bulges outward and undergoes plastic deformation can be stably performed, and energy can be effectively absorbed in advance before the others yield.

  Moreover, since a cylinder is used as the energy absorbing material and a core rod is passed through the cylinder, effective absorption of energy can be realized with a simple structure.

  In the above vibration damping structure, when there is a restoring means for releasing the compressive force on the cylinder so as to extend the cylinder and return the peripheral wall to the core rod side, the compressive force acts repeatedly In addition, the cylinder can be shortened and bulged plastically deformed for each compression force, and energy can be effectively absorbed.

  In particular, the core rod is composed of an end of a brace, the tip of the end protrudes outside the cylinder, and the protruding end is provided with a retaining material that contacts the end of the cylinder, and the other end of the cylinder is When a tensile force is applied to the brace when it comes into contact with the brace connection side member, before the brace yields, the cylinder is shortened and its peripheral wall bulges and plastically deforms to absorb the energy. When the acting tensile force is released, when the restoring means is designed to extend the cylinder and return its peripheral wall to the core rod side, when the tensile force is repeatedly applied to the brace, the tensile force against the brace each time The cylinder can be shortened and bulged plastically deformed by force, effectively absorbing energy and eliminating slip history.

  Since the present invention is as described above, energy can be effectively absorbed in advance before others yield, and it can be realized with a simple structure.

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

  The vibration damping structure of the first embodiment shown in FIGS. 1 to 3 is applied to the end connecting portion of the braces 1 and 1, as shown in FIG. 4 is a foundation, and the upper end side of the braces 1, 1 is connected to the upper end corner of the load-bearing panel frame 2, and the lower end side is connected to the base 3 beyond the load-bearing panel frame 2, Is incorporated in the connecting portion between the brace 1 and the base 3.

  The vibration damping structure portion has a structure as shown in FIG. 1 (a), in which 5 is an energy absorbing cylinder, 6 is a core rod, 7 is a nut as a retaining material, Reference numeral 8 denotes a disc spring as a restoring means.

  The cylinder 5 is made of, for example, a low-yield point steel pipe or the like, and at both ends thereof, as shown in FIG. 1 (b), flange portions 5a and 5a projecting outward are provided, and between the flange portions 5a and 5a. Further, the disc springs 8 and 8 are packaged so that the large diameter sides thereof face each other and the small diameter side is brought into contact with the flange portions 5a and 5a.

  The core rod 6 is composed of the end portion of the brace 1 and is made of a material having a size equal to or slightly smaller than the inner peripheral size of the tube 5 and can be passed through the tube 5. A screw portion 6a for screwing the nut 7 is provided on the outer peripheral portion.

  Then, the end core bar portion 6 of the brace 1 passes through the load-bearing panel frame 2 and is passed through a through hole 3a provided in the base 3, and the tip side thereof passes through the cylinder 5 with the disc springs 8 and 8. The nut 7 is screwed into the threaded portion 6a at the protruding end, and the nut 7 is tightened so that the brace 1 is in a tensioned state.

  In the above structure, when a horizontal force acts on the load-bearing panel frame 2 and a large pulling force acts on the brace 1 due to an earthquake or the like, as shown in FIG. A compression force acts on the cylinder 5 through the cylinder 5 and the cylinder 5 is shortened while compressing the disc springs 8 and 8 before the brace 1 yields, and the inner circumference side is supported by the core rod portion 6 and is axially moved. The intermediate peripheral wall 5b performs an outward bulging plastic deformation operation to absorb energy and prevent the brace 1 from yielding.

  When the pulling force on the brace 1 is released, as shown in FIG. 2 (b), the disc springs 8 and 8 perform a restoring operation, whereby the cylinder 5 expands and its peripheral wall is the core rod portion. 6 is restored to the original shape without the outward bulge. Accordingly, when a pulling force is applied again to the brace 1, the cylinder 5 can be shortened and the plastic deformation of the peripheral wall 5b can be performed in the same manner as described above to absorb energy and eliminate slip history. it can.

  Thus, since the above-described vibration damping structure has a structure in which the core rod portion 6 is passed through the energy absorbing cylinder 5, when the compression force acts on the cylinder 5, the cylinder 5 is shortened, The inner peripheral side is supported by the core rod part 6 and the peripheral wall 5b of the intermediate part in the axial direction can be stably bulged outwardly and plastically deformed, and has an effect before the brace 1 yields. Energy can be absorbed. Moreover, since the cylinder 5 is used as the energy absorbing material and the core bar portion 6 is passed through the cylinder 5, effective energy absorption can be realized with a simple structure. In addition, because the cylinder 5 which is shortened and the peripheral wall 5b is outwardly bulged and plastically deformed, the disc springs 8 and 8 are extended so that the peripheral wall 5b of the cylinder 5 is returned to the core rod portion 6 side. Even if the tensile force is repeatedly applied to the brace 1, the cylinder 5 can be stably shortened and the outwardly bulging plastic deformation of the peripheral wall 5b can be repeated with respect to each pulling force, so that energy can be effectively used. Can be absorbed.

  The second embodiment shown in FIG. 4 (a) is for an application example other than a brace, and one collar portion 5a of the energy absorbing cylinder 5 is connected to the first member 9 and the other collar. The portion 5 a is connected to the second member 10, and the core rod 6 is passed through the cylinder 5.

  In this vibration damping structure, as shown in FIG. 4B, when the first member 9 and the second member 10 move relative to each other in the approaching direction, a compressive force acts on the cylinder 5 and the cylinder 5 is shortened. The outer wall 5b undergoes outward bulging plastic deformation to absorb energy, and a restoring means such as a disc spring is omitted from the vibration damping structure portion. Also, from this state, as shown in FIG. 4C, when the first member 9 and the second member 10 move relative to each other in the direction of separation, the cylinder 5 is pulled by both the members 9 and 10, and is extended. The peripheral wall 5b is returned to the core rod 6 side. Thus, the damping structure of this invention can be used in structural parts other than a brace, and the restoring means should just be provided as needed.

  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 a low yield point steel pipe is used as the energy absorbing cylinder is shown. However, the cylinder is shortened and the outer wall is subjected to outward bulging plastic deformation in advance. There are no particular restrictions on the material or form.

  Moreover, although the case where the end 6 of the brace 1 is a core rod portion is shown in the above embodiment, the core rod is connected to the end of the brace and the core rod is passed through the cylinder. May be.

FIG. 1A is a cross-sectional side view showing the vibration damping structure of the first embodiment, and FIG. 2B is a perspective view of an energy absorbing cylinder. FIGS. 1A and 1B are cross-sectional side views showing the operating state of the vibration damping structure. It is a front view which shows the structure in which this damping structure part was incorporated. FIG. 1 (a) is a cross-sectional side view showing the vibration damping structure of the second embodiment, and FIGS. 2 (b) and (c) are cross-sectional side views showing their operating states.

Explanation of symbols

1 ... Brace 3 ... Base (member)
5 ... cylinder for energy absorption 5b ... peripheral wall 6 ... core rod part (core rod)
7 ... Nut (prevention material)
8 ... Belleville spring (restoration means)

Claims (2)

In the cylinder for energy absorption, a core rod having an outer peripheral size substantially the same as the inner peripheral size of the cylinder is passed through in a state where the compression force in the axial direction acts on the cylinder. The cylinder is shortened, and the inner peripheral side is supported by a core rod, the peripheral wall of the intermediate portion in the axial direction bulges outward and plastically deforms, and absorbs energy , and
A damping structure comprising a restoring means for extending a cylinder and returning its peripheral wall to the core bar side by releasing the compressive force applied to the cylinder . The core rod consists of the end of the brace, the tip of the end protrudes outside the cylinder, and a stopper is provided at the protruding end to contact the end of the cylinder, and the other end of the cylinder is connected to the brace When a tensile force is applied to the brace, the cylinder is shortened and its peripheral wall bulges and deforms plastically to absorb energy and act on the brace. 2. The damping structure according to claim 1, wherein when the tensile force is released, the restoring means extends the cylinder and returns the peripheral wall to the core bar side.

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