A multi-stage anti-seismic anti-drop beam device for prefabricated box girders

Abstract

The invention relates to the field of bridges, and specifically discloses a multi-stage anti-seismic anti-fall beam device for prefabricated box girders. The anti-fall beam device is arranged between two adjacent box girders. The anti-fall beam device includes a cylinder body, a left Tie rod, right pull rod, left magnetic assembly, right magnetic assembly, left limiting plate and right limiting plate, the cylinder body is in a cylindrical structure and its two ends are closed by the left end cap and the right end cap respectively, and the cylinder is filled with There is damping fluid, the left magnetic component and the right magnetic component are magnetically connected to each other, and memory alloy connecting ribs are fixedly connected between the left limiting plate and the right limiting plate. Through the multi-stage energy consumption design, the device of the present invention can carry out multi-stage earthquake resistance for the bridge, which can be adapted to the action of low-amplitude vibration during small earthquakes, and can also be adapted to the dissipation of high-amplitude vibration during large earthquakes, reducing the design cost , making it more in line with actual needs.

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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