A variable speed mass damper system for bridge shock absorption
A technology of mass dampers and bridges, which is applied in bridges, bridge construction, bridge parts, etc., can solve the problems such as the inconspicuous effect of earthquake damping, and achieve the effect of reducing the vibration of the main girder
Active Publication Date: 2019-02-01
DALIAN UNIV OF TECH
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Problems solved by technology
Although the conventional tuned mass damper (TMD) has a certain shock absorption function, due to the large mass of the main girder, the seismic shock absorption effect of the tuned mass damper applied on the bridge is not obvious
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[0012] The span layout of the bridge is 180+460+180 meters, the width is 24 meters, and the main beam is a steel truss structure. A horizontal connector 5 is set at the end of the main girder 6 to connect with the gearbox 2 on the anchorage 7; when the bridge vibrates under the action of an earthquake, the vibration speed will be transmitted to the gearbox 2 through the connector 5; the gearbox 2 It is a rack-driven gear transmission mechanism, and the transmission ratio is 4; the gearbox 2 transmits the received speed to the tuning mass block 1 after amplifying; two vertically moving tuning mass blocks 1 are set at each anchorage, Each tuning mass 1 weighs 100 tons, and is connected with the gear of the gearbox 2 with a wire rope; the lower end of the tuning mass 1 is connected with a spring 3 to assist the tuning mass 1 to vibrate in the vertical direction along the slideway; and in the tuning mass 1 A rubber energy dissipator 4 is placed at the bottom of the slideway to dis...
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The invention provides a speed changing mass damper system for bridge shock absorption and belongs to the technical field of passive control over bridge structures. The speed changing mass damper system comprises a tuning mass block, a gearbox, a spring, an energy dissipation device and a connecting piece, longitudinal displacement of a girder caused by earthquake force can be effectively reduced, and thus the bending moment of a cable tower is reduced. The horizontal connecting piece is arranged at the end of the girder and connected with the gearbox on an anchorage. The gearbox is a speed changing mechanism, and as for the speed changing mechanism, a rack is used for driving a gear. The tuning mass block moving vertically is arranged in the position of the anchorage and connected with the gear of the gearbox through a steel wire rope. The spring is connected to the lower end of the tuning mass block, and the rubber energy dissipation device is installed at the bottom of a slideway of the mass block. The kinetic energy obtained by the girder in an earthquake is transmitted to the tuning mass block through the gearbox, the gearbox can amplify the speed of the tuning mass block, therefore the tuning mass block can absorb more kinetic energy, the kinetic energy of the girder is reduced, and the purpose of shock absorption is achieved.
Description
technical field [0001] The invention belongs to the technical field of bridge structure passive control, relates to bridge damping technology, in particular to a variable-speed mass damper system for bridge damping. Background technique [0002] When the long-span suspension bridge undergoes an earthquake, the longitudinal displacement of the main girder is large, and the inertial force of the main girder will be transmitted to the cable tower, causing the cable tower to bear a large bending moment. At present, the usual methods of shock absorption are: (1) using viscous dampers between the main beam and the anchorage or between the main beam and the cable tower; (2) using anti-seismic bearings. Although the conventional tuned mass damper (TMD) has a certain damping function, the earthquake damping effect of the tuned mass damper applied to the bridge is not obvious due to the large mass of the main girder. Contents of the invention [0003] The invention provides a varia...
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IPC IPC(8): E01D19/00
CPCE01D19/00
Inventor 檀永刚管如意张哲黄才良王会利潘盛山王骞
Owner DALIAN UNIV OF TECH