Double-freedom-degree energy absorption type girder-falling-resisting device

Abstract

The invention discloses a double-freedom-degree energy absorption type girder-falling-resisting device which comprises a base and a stress deformation component, wherein the base is fixed on a pier or a bent cap. The stress deformation component is composed of a circular steel tube. Holes are formed in specific positions of the circular steel tube to form a plastic region M. The double-freedom-degree energy absorption type girder-falling-resisting device is simple in structure and convenient to machine and manufacture. Due to the fact that the plastic region is formed by the holes, states of the plastic region can be divided into an elastic state, a plastic state and a damage state according to external force, and a stress mode is clear. Due to the fact the circular cross-section steel tube is adopted in the stress deformation component, the cross section is symmetrical in all directions, and bidirectional stress is achieved. The most reasonable stress state can be determined according to arrangement modes and arrangement shapes of the holes. In addition, a buffering cushion block is arranged on one side, close to a main girder, of the flange plate, and therefore impact force can be reduced. Due to the fact that the double-freedom-degree energy absorption type girder-falling-resisting device is fixed on the pier or the bent cap through high-strength bolts, installation and replacement are convenient. The double-freedom-degree energy absorption type girder-falling-resisting device can be made of steel for common bridges and is free of the special requirements for materials and welding, and therefore manufacturing cost is low.

Description

technical field [0001] The invention relates to an anti-collision device for a double-degree-of-freedom bridge, in particular to an energy-absorbing anti-falling device for a circular cross-section steel beam. Background technique [0002] The influence of earthquake cannot be ignored in the design of bridges, especially in high-intensity earthquakes, where it plays a major control role. At present, the main anti-seismic measures for super-long-span bridges include installing dampers and shock-absorbing and isolating bearings, and the anti-seismic measures for small and medium-sized bridges include setting anti-fall beam devices and plastic hinges. The bridge anti-drop beam device can be divided into a block form and a connected form according to the layout form. The block form can be divided into concrete block and steel block, and the connection form can be divided into steel wire rope connection and steel structure connection. According to the working principle of the a...

AI Technical Summary

Problems solved by technology

[0003] At present, the anti-seismic measures for small and medium-sized bridges in China are mainly based on setting blocks, and the design method of the structure has not yet been established, and its force mode is non-energy-absorbing, and its effect is limited during earthquakes

In addition, there are still disadvantages such as inconvenient replacement, relatively complex structure, uncertain plastic deformation position, unclear failure mode, and only one-way force.

Dampers and shock-absorbing and isolating bearings are expensive, and the large number of small and medium-sized bridges is difficult to apply on a large scale

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