An elastic-plastic shock-absorbing cable for lateral shock absorption of large-span bridges

Abstract

The invention relates to an elastic-plastic damping cable for transverse damping of a large-span bridge. Redundant design is adopted for inhaul cable anchoring, and a redundant cable wire reinforcing segment is additionally arranged between an anchoring zone and an effective cable segment. The number of cable wires in the anchoring zone and the reinforcing segment is larger than that of effective cable wires, redundant cable wires are cut off in the effective cable segment, a tension resisting capacity level difference between the anchoring zone and the reinforcing segment, and the effective cable segment is formed, and thus it is avoided that potential weak and destructive links occur in the anchoring zone or the reinforcing segment. Damping cables can provide sufficient restraint rigidity and bearing capacity under the normal use condition and have sufficient deformability and energy dissipation capacity under the strong earthquake condition, and therefore the seismic performance of the large-span bridge in a strong earthquake area can be significantly improved.

Description

technical field [0001] The invention belongs to the technical field of damping of bridge engineering structures, and relates to an elastic-plastic damping cable used for transverse damping of long-span bridges. Background technique [0002] Long-span bridges are major transportation infrastructure projects. In order to reduce secondary disasters after earthquakes and ensure the safety of traffic lifelines, their seismic safety cannot be underestimated. With the implementation of my country's western resource development strategy and the "One Belt, One Road" national strategy, the construction of long-span bridges in high-intensity earthquake areas and active fault areas has become an inevitable and realistic demand. A lot of practice has proved that adopting proper seismic reduction and isolation design is an effective method to improve the seismic performance of long-span bridges. , can significantly reduce the inertial force transmitted to the substructure, and realize th...

AI Technical Summary

Problems solved by technology

However, the anchor head is the potential weak link of the current elastic cables and finished cable-stayed cables, which cannot ensure their stable plastic behavior; secondly, the cable-stayed cables used for bridge lateral There are great differences in the stress state of the cables, which have higher requirements on the connection structure such as rotation, etc. Objectively, it is necessary to develop new products according to the design purpose and use requirements of the shock-absorbing cables

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