Elastoplastic damping system for long-span bridges

Abstract

The invention relates to a large-span bridge elastic-plastic damping system. The large-span bridge elastic-plastic damping system comprises damping cable pairs composed of elastic-plastic damping cables and a transverse viscous damper. The two damping cable pairs are arranged, one ends of the damping cable pairs are anchored on anchoring blocks integrally cast with a main beam of a bridge, the other ends of the damping cable pairs are anchored on main tower columns on the other sides, and the two damping cable pairs are symmetrically arranged. One end of the viscous damper is anchored on the bottom of the main beam, and the other end of the viscous damper is anchored on a main tower cross beam of the bridge. The damping system can provide enough restraint rigidity and bearing force under the normal use condition, has enough deformation capacity and energy consumption under the strong earthquake condition, and can remarkably improve the anti-seismic performance of the large-span bridge in a highly seismic region.

Description

technical field [0001] The invention belongs to the technical field of shock absorption of bridge engineering structures, and relates to an elastic-plastic shock absorption system of a long-span bridge. 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 the mutual...

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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