Bridge pier damping device

Abstract

The invention discloses a bridge pier damping device. The device comprises a base, vertical vibration damping mechanisms, a transverse vibration damping mechanism and a top plate; the vertical vibration damping mechanisms comprise supporting seats, spiral springs arranged between the supporting seats and the base, and magnetorheological fluid dampers arranged in the base and used for applying damping to vibration of the supporting seats in the vertical direction; the transverse vibration damping mechanism comprises ellipsoidal elastic rollers located between the top plate and the supporting seats and magnetorheological fluid rotary dampers used for applying damping to the rotation of the ellipsoidal elastic rollers; and ellipsoidal surfaces matched with the ellipsoidal elastic rollers areformed at the bottom of the top plate and the top surface of the supporting seats. According to the bridge pier damping device, the device can "intelligently" adjust the self-rigidity to change the natural frequency of the structure to resist impact force and large deformation under the impact load by utilizing the magnetorheological fluid damper, and the pier-beam displacement can be inhibited byrelieving the transmission of the shock vibration energy through the adjustment of the damping ratio of the magnetorheological fluid damper at the emergency moment when the bridge is impacted and vibrated.

Description

technical field [0001] The invention relates to the field of bridges, in particular to a shock absorbing device for bridge piers. 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 life 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. [0003] In order to improve the vibration isolation and buffering capacity of bridge piers, passive bearings (such as steel bearings, rubber bearings, special seismic bearings,...

AI Technical Summary

Problems solved by technology

Although traditional passive bearings have good vibration isolation and damping performance under the action of general vibration loads, they cannot "intelligently" adjust their own stiffness and increase vertical strength to resist impact forces and large deformations under large load impacts, nor can they produce Larger damping / deformation is used to dissipate the instantaneous large energy, so it will produce destructive displacement under the action of large horizontal shear force, and generally lacks good compatibility with shock resistance and vibration isolation, so it has become a bridge structure safety system. The weakest link often causes earthquake damage such as pier-beam displacement and falling beams, which brings great hidden dangers to the anti-shock protection of pier-beam structures

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