An elastic-plastic central buckle device for long-span suspension bridges

Abstract

The present invention is an elastic-plastic central buckle device for a large-span suspension bridge, comprising at least one elastic-plastic central buckle, each elastic-plastic central buckle includes two cable clamps, two rigid braces, a rigid horizontal beam and two elastic-plastic cables, The two cable clips are installed on the main cable, and the two cable clips are respectively connected with one end of the two rigid braces, and the other ends of the two rigid braces are connected with the rigid horizontal beam, and one end of the two elastic-plastic cables They are respectively connected to both sides of the rigid horizontal beam along the bridge direction, and the other ends of the two elastic-plastic cables are connected to the main beam. The invention can play the role of the conventional central buckle while avoiding the impact on the bridge structure, and can also cope with extreme strong earthquakes; the elastic-plastic central buckle can enhance the shock absorption and energy consumption capacity of the bridge system, and has a large single-time consumption The elastic-plastic cable can adjust the number and length of steel wires according to the bridge conditions, and adapt to the displacement and stiffness requirements of the main girder under different bridges and different geological conditions.

Description

technical field [0001] The invention relates to the technical field of shock absorption of bridge engineering structures, in particular to an elastic-plastic central buckle device of a large-span suspension bridge. Background technique [0002] With the development of long-span bridge technology and the increase of construction projects in western my country, more and more suspension bridges appear in projects. Due to the dense active faults and frequent earthquakes in the western region, the seismic requirements for suspension bridges have been further improved. [0003] The structural dynamic characteristics of long-span suspension bridges and long-span cable-stayed bridges are not the same. In the transverse direction, because the main girder is generally longer and more flexible, the first-order mode shape is generally lateral vibration, and the main tower is generally weaker in seismic performance. A good H-shaped bridge tower, so the transverse earthquake usually does...

AI Technical Summary

Problems solved by technology

However, there are problems of excessive internal force and insufficient deformation under strong earthquake conditions.

The Dadu River Bridge adopts the BRB central buckle, which improves the ability of the suspension bridge to adapt to longitudinal earthquakes to a certain extent, but the deformation capacity is still relatively limited, and it is difficult to meet the deformation requirements under strong earthquakes in the near field. , requires a large length of BRB member, which is difficult to achieve at the mid-span position

The Nu River Bridge in design adopts the sacrificial central buckle to solve the contradiction between normal use and extreme earthquakes through system conversion, but the sacrifice of the central buckle has a certain impact effect, and the sacrifice of the central buckle will lead to the main The larger longitudinal displacement of the beam, the requirements for the related shock absorbers and expansion joints are also increased accordingly

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