Design method and device of anti-shock and vibration-isolation bridge pier magneto-rheological bearing-damper

Abstract

The invention relates to a design method and a device of an anti-impact vibration isolation type magnetorheological pier bearing-damper system. According to the method, magnetorheological elastomers which are large in vertical stiffness, high in structural strength and adjustable in elasticity modulus are used as bearing bodies, and impact resistance and vibration isolation of a pier-beam structure under the action of large load are realized by adjustment of pier stiffness; a magnetorheological damper capable of providing large damping without medium settlement is used as a damping device, three-dimensional rotation capacity of the damper is improved by using a ball-and-socket joint mode at two ends thereof, and pier-beam displacement is restrained by damping adjustment for further vibration reduction and energy dissipation; magnetorheological elastomer bearings, the magnetorheological damper and a controller jointly form an anti-impact vibration-isolation pier bearing device, the controller intelligently adjusts stiffness and damping of the bearing-damper system by detecting the impact vibration of a bridge, structural strength of the pier-beam structure is improved while damping ratio thereof is increased, and when the bridge is under large-load impact vibration, impact transmission is slowed down or isolated and pier-bean displacement is restrained so as to guarantee structural safety of the bridge.

Description

technical field [0001] The invention relates to an anti-shock vibration reduction and disaster protection technology of a bridge structure under a large impact load, in particular to a design method and device for a magnetorheological support-damper of an anti-shock vibration isolation type bridge pier. Background technique [0002] When bridges are threatened by large loads such as earthquakes, explosions, vehicle overloads and impacts, and ships hitting bridge piers, they often produce large impact damage and displacement at the pier-beam junction, which can cause damage to the pier-beam structure and serious damage. Then cause collapse, bring harm to people's lives and property and national economic development. At present, reducing the dynamic response of pier-beam structures under large impact loads and improving their buffering and vibration isolation capabilities have become key issues to be solved in the field of bridge structure anti-shock protection engineering. ...

AI Technical Summary

Problems solved by technology

But even if the combination of damping adjustable device and passive support is adopted, its anti-shock ability is limited, because the duration of (large load) impact is very short (can be within tens of milliseconds), and the maximum dynamic load usually occurs at In the first few cycles, it is not enough to just adjust the damping, but also need to be able to adaptively adjust the stiffness to change the natural frequency (vibration period) of the structure, improve the structural strength and impact resistance

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