Title:
METHOD AND EQUIPMENT FOR DAMPING DIAGONAL-CABLE BRIDGE DIAGONAL-MEMBER CABLE
Document Type and Number:
Japanese Patent JP3045042
Kind Code:
B2
Abstract:
PURPOSE: To inhibit all vibrations such as the wake galloping, rain vibrations, vortex excitation, etc., of the diagonal-member cables of a diagonal cable bridge effectively.
CONSTITUTION: One end of a cylinder-lock type constraining-releasing device 4 is fixed to a main girder 2, and the other end is fastened to a diagonal-member cable 3. The diagonal-member cable 3 is brought to the state of constraint release first, and conducts the vibrations of a chord in length L using a fixing section as an end section to disturbance such as a wind. When amplitude reaches a set value, the constraining-releasing device 4 constrains the displacement of the diagonal-member cable 3 by a command from a controller 6. The diagonal-member cable 3 performs the vibrations of a chord in length (L-a) using a device mounting point as an end section by a constraint, and is vibrated in the mode of vibrations employing the device mounting point as a node, but higher vibrations are generated by releasing the constraint of the diagonal-member cable 3 when force applied to the diagonal-member cable 3 at the device mounting point reaches a set value, and energy in a primary mode can be transferred to a higher mode. Accordingly, the vibrations in the primary mode are damped.
Inventors:
Ryuji Nakano
Katamura Ryuta
Katsura Ogasawara
Katamura Ryuta
Katsura Ogasawara
Application Number:
JP13678595A
Publication Date:
May 22, 2000
Filing Date:
June 02, 1995
Export Citation:
Assignee:
Kashima Construction Co., Ltd.
International Classes:
E01D1/00; E01D11/04; E01D19/16; (IPC1-7): E01D1/00
Domestic Patent References:
| JP734415A |
Attorney, Agent or Firm:
Satoshi Hisakado (1 person outside)