Multi-stage anti-seismic and anti-beam-falling device for prefabricated box girder

Abstract

The invention relates to the field of bridges, and discloses a multi-stage anti-seismic and anti-beam-falling device for a prefabricated box girder, the anti-falling beam device is arranged between two adjacent box beams; the anti-beam-falling device comprises a barrel, a left pull rod, a right pull rod, a left magnetic assembly, a right magnetic assembly, a left limiting plate and a right limiting plate. The cylinder body is of a cylindrical structure, the two ends of the cylinder body are sealed through a left end cover and a right end cover respectively, the cylinder body is filled with damping liquid, the left magnetic assembly and the right magnetic assembly are in magnetic connection, and a memory alloy connecting rib is fixedly connected between the left limiting plate and the rightlimiting plate. By means of the multi-stage energy dissipation design, multi-stage earthquake resistance can be performed on the bridge, the device can adapt to the low-amplitude vibration effect during small earthquakes and can also adapt to dissipation of high-amplitude vibration during large earthquakes, the design cost is reduced, and the device better meets the actual requirement.

Description

technical field [0001] The invention relates to the technical field of bridges, and specifically discloses a multi-stage anti-seismic anti-drop beam device for prefabricated box girders. Background technique [0002] When the bridge is subjected to a strong earthquake, the bridge will bear a large load in an instant, resulting in a large displacement. The displacement exceeds the shelving length of the beam or the beam will fall due to insufficient strength of the stopper, which will cause irreparable damage. serious loss. The anti-fall beam structure is a connection measure structure used in the bridge structure to resist earthquakes and prevent the beam body from falling or disengaging. The current common practice is to add an anti-fall beam structure between the main girders to prevent the longitudinal or lateral displacement of the main girders. [0003] Structural vibration has gradually become a key issue in the structural design of bridges, industrial and civil build...

AI Technical Summary

Problems solved by technology

In the anti-seismic structural measures of existing bridges, if the design of the damping stiffness of the anti-fall beam is too large at the initial stage of bridge construction, the seismic load will frequently act on the anti-fall beam structure when encountering small earthquake loads with high frequency. A small part of the displacement of the bridge will limit the use of the follow-up anti-fall beam structure. If the damping stiffness of the anti-fall beam is too small, the effect of energy dissipation and shock absorption will not be obvious when encountering a large earthquake load. Cannot play the role of anti-drop beam

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