JPH03194008A - Cable for high damping structure - Google Patents

Abstract

PURPOSE:To enhance the damping characteristic of a cable material itself so as to reduce vibration and to facilitate the attachment and maintenance management by disposing a material which exhibits a historical damping caused by an internal energy loss accompanied with a deformation, among structural cable strands. CONSTITUTION:A plurality of layers each composed of a plurality of cable strands 1 are bundled coaxially, and a damping material 2 which is made of a high damping rubber or the like used for the building construction or the like and which exhibits a historical damping caused by an internal energy loss accompanied with a deformation of the cable, is disposed between the each adjacent layers. A shape holding taping 3 is wound around the bundle of cable strands 1 disposed thereamong with the damping material 2. With this arrangement, it is possible to obtain a high damping structure cable which is excellent in workability and which facilitates the maintenance management without deteriorating the aesthetic.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a structural cable used as a suspension material for a suspension structure of a bridge or building structure.

(Prior art) Structural cables used for hanger lobes of suspension bridges, cable-stayed cables for cable-stayed bridges, or hanging materials for suspended roofs of architectural structures have extremely low attenuation performance.
Often vibrates due to wind or other dynamic effects. Such vibrations pose a serious problem not only in terms of safety in terms of static or fatigue strength, but also in terms of use, such as making users feel uneasy.

Conventionally, in order to reduce the above-mentioned vibrations, damping was applied from the outside by attaching an external damping device such as an oil damper or a damping wire to the structural cable.

(The topic that the invention seeks to solve).

When adding attenuation externally as in the conventional method,
Due to building limits and structural constraints, the locations where damping devices can be installed are limited, making the structure complex, and a large number of devices must be installed to accommodate various vibration modes.

In addition, there were problems with workability such as the installation of vibration damping devices requiring a large amount of labor, maintenance problems when using hydraulic equipment such as oil dampers, and problems with the aesthetic appearance of the structure. .

The present invention has been proposed in view of the problems of the prior art, and its purpose is to provide a highly attenuated structural cable that has excellent workability, is easy to maintain, and does not impair its aesthetic appearance. It is in the point of doing.

(Means for Solving the Problems) In order to achieve the above object, the present invention is constructed by disposing a material that exhibits hysteresis damping due to internal energy loss due to deformation between the strands of a structural cable. .

(Function) As described above, the structural cable according to the present invention has internal attenuation of the structural cable itself by interposing a material that exhibits hysteretic attenuation due to internal energy loss due to deformation between the wires of the cable. is increased and vibration is reduced.

(Example) An example in which the present invention is applied to a parallel wire strand used for a cable-stayed bridge or suspended structure construction will be described below.

(1) is a cable wire, in which multiple layers each consisting of a plurality of homogeneous wires (1) are concentrically focused, and a high attenuation cable used in construction, etc. is placed between the layers of adjacent cable wires (1). A damping material (2) made of rubber (H4gh Damprung Rubber) or the like is interposed to exhibit hysteresis damping due to internal energy loss accompanying deformation of the cable.

In the figure, (3) is the shape-retaining taping (3) of the same book, which is wrapped around the outer periphery of a bundle of cable wires (1) on which the damping material (2) is arranged.

Since the illustrated embodiment is constructed as described above, the damping material (2) incorporated in the cable material increases the damping performance of the cable material itself and reduces the vibration of the cable material.

Note that the arrangement of the damping material (2) is not limited to that in the above embodiment, and may be any arrangement that causes shear deformation as the cable material is bent.

(Effects of the Invention) According to the present invention, as described above, by interposing a material that exhibits hysteretic attenuation due to internal energy loss due to deformation between the wires of a structural cable, the cable material itself It is possible to improve the damping performance of the cable and reduce the vibration of the cable without installing an external damping device. Therefore, the structure is simple, the installation work is easy, and the maintenance and management work is not required. It does not spoil the beauty.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view showing an embodiment of a cable for high attenuation structure according to the present invention, and FIG. 2 is a view taken along arrows 1--2 in FIG. (1)... Cable wire, (2)... Damping material.

Claims (1)

[Claims] A high-attenuation structural cable characterized by interposing a material that exhibits hysteretic attenuation due to internal energy loss accompanied by deformation between the strands of the structural cable.