Bridge anti-seismic structure with additional cable-connection damper device

Abstract

The invention provides a bridge anti-seismic structure with an additional cable-connection damper device. The structure comprises a bridge support, cables, dampers and cable sets, wherein one of the cables is disposed along the deck length direction and between an abutment and a bridge pier which are adjacent; one cable set is disposed along the deck length direction and between two adjacent bridge piers; each cable set comprises the two cables; and the damper is disposed on each cable. According to the invention, the structure is simple and novel; pre-pulling force is applied to the cables, so that deformation of top parts of the bridge piers can be restrained effectively and bridge rigidness can be increased; and under seismic effects, the dampers can absorb seismic energy, so that seismic reduction can be implemented through energy consumption. In this way, seismic displacement reactions on top parts of the bridge piers are effectively controlled; slide damage of the bridge support caused by too larger displacement of the pier top parts can be avoided; relative displacement between a beam body and the bridge piers is effectively controlled; seismic beam-falling damage of the beam body can be avoided; too large seismic force bearing of the bottom parts of the bridge piers and a foundation can be reduced; and overall anti-seismic performance of a bridge can be improved.

Description

technical field [0001] The invention belongs to the field of bridge structures, in particular to a bridge anti-seismic structure with an additional cable connection damper device. Background technique [0002] China is a country prone to strong earthquakes. Strong earthquakes not only destroy a large number of engineering buildings, but also form secondary disasters, causing a large number of casualties and huge economic losses. Bridge engineering is the key to land transportation. Earthquake damage to bridge engineering not only interrupts land transportation, increases the difficulty of earthquake rescue, but also causes large economic losses in post-disaster repair and reconstruction work. In order to continuously improve the seismic performance of bridges and reduce the degree of earthquake damage to bridges, the vast number of scientific and technological workers in our country continue to carry out research work on bridge seismic resistance and seismic isolation. [0...

AI Technical Summary

Problems solved by technology

The analysis shows that the bridge beam failure in the earthquake is caused by the excessive deformation of the bridge piers, and the relatively large relative displacement between the piers and beams, which exceeds the supporting length of the main girder. The reason for the large deformation of the bridge piers is that Because of the lack of effective restraint and anchoring measures on the top of the pier, therefore, in order to control the seismic displacement response of the top of the pier, the patent CN101942797B discloses a bridge structure with horizontal cable restraint between the top of the pier and between the top of the pier and the top of the abutment However, the seismic response of bridges under earthquake action is dominated by first-order longitudinal deformation, that is, when an earthquake occurs, the upper structural girder and the top of the pier will deform synchronously in one direction, while the deformation of the lower part of the pier and the foundation is very small. Small, therefore, the restraining and anchoring effects of the cables of the patent CN101942797B on the deformation of the top of the pier are not obvious. Some constraints and anchoring

Excessive deformation will still occur on the top of the pier, and the beam body of the superstructure still has the risk of falling beams

Therefore, the existing technology is not ideal enough to solve the damage problem of the bridge under the action of the earthquake, and needs to be further studied and further improved

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