A suspension bridge transverse bridge direction and torsion damping generalized acceleration mass damper system

Abstract

The invention provides a suspension bridge transverse bridge direction and torsion damping generalized acceleration mass damper system, and belongs to the technical field of bridge structure passive control. Anchoring mass blocks located in a main beam are anchored to the anchors at the two ends of the main beam through in-beam anchor cables, and the large transverse and torsion rigidity and inertia are achieved. The main beam generates transverse displacement and torsional displacement under the action of transverse wind; the transverse displacement is transmitted to a gearbox mounted on theanchoring mass block through a connecting rod; after being amplified by the gearbox, the transverse displacement is transmitted to an additional mass block, a horizontal spring and an energy dissipater, so Kinetic energy of vibration of the main beam is transmitted to the additional mass block. The anchoring mass block in the main beam is not influenced by transverse wind; according to the technical scheme, the large static inertia is kept, a relatively fixed support can be provided for the gearbox and the vertical spring, so the main beam obtains a large transverse damping force and a large vertical elastic supporting force; said forces are equivalent to a TMD in the torsion direction of the main beam, and the purpose of reducing vibration of the main beam is achieved through the combinedactions of the two directions.

Description

technical field [0001] The invention belongs to the technical field of passive control of bridge structures, in particular to bridge damping technology, and in particular to a generalized acceleration mass damper system for lateral and torsional vibration damping of suspension bridges. Background technique [0002] The transverse stiffness and torsional stiffness of the main girder of a long-span suspension bridge are relatively small, and it is easy to vibrate under the action of transverse wind load, and even torsion-based flutter may occur. The commonly used vibration reduction methods are: (1) 1. Set up wind-resistant cables; (2) Install tuned mass damper TMD inside the main beam; (3) Increase the lateral stiffness and torsional stiffness of the main beam. The transverse wind-resistant cable is suitable for pedestrian suspension bridges, which affects the appearance of the bridge and has a higher cost; TMD has a better effect in vertical vibration reduction, but the tran...

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