A vibration-absorbing device for multi-span bridges activated by seismic acceleration

Abstract

The invention relates to a multi-span bridge damping device activated by earthquake acceleration. The multi-span bridge damping device activated by the earthquake acceleration comprises an excitation ball, an upper sleeve box, a lower clamp seat and a ball bracket; the upper sleeve box is fixed on the bottom of a girder body; the lower clamp seat is fixed at the top of a slide pier; a gap is reserved between the upper sleeve box and the lower clamp seat; the ball bracket is fixed on the lower clamp seat, extends into the upper sleeve box by the ball bracket at the side wall of the upper sleeve box and supports the excitation ball in the upper sleeve box; the excitation ball is positioned on the ball bracket under the normal condition and the upper sleeve box and the lower clamp seat are not restrained at all so as to meet the longitudinal telescopic displacement of the girder body under the temperature action; during an earthquake, the excitation ball is separated from the ball bracket and falls into a ball slot of the lower clamp seat under the action of the earthquake acceleration, a clamp hole in a bottom plate of the upper sleeve box is collided against the excitation ball, so the relative displacement between the girder body and the slide pier is limited, the girder body and the slide pier are enabled to coordinately bear the earthquake load and the anti-earthquake capacity of continuous bridges is improved.

Description

technical field [0001] The invention relates to a multi-span bridge damping device activated by earthquake acceleration, which is suitable for new construction or seismic reinforcement of railway bridges, highway bridges, urban viaducts and various large-scale continuous beam structures, and can make the structures under the action of sudden earthquakes Coordinated stress, improve the overall seismic performance of the structure. Background technique [0002] In order to reduce the seismic response of continuous girder bridges and improve the seismic performance of continuous girder bridges, shock absorbing measures such as shock absorbers, isolation bearings and viscous dampers are usually used for continuous girder bridges, such as lead rubber bearings, viscous dampers, etc. Wait. However, the current conventional schemes do not change the state that the fixed piers of continuous girder bridges are independently loaded, and the other sliding piers have not been brought in...

AI Technical Summary

Problems solved by technology

In recent years, some scholars have proposed the Lock-up device. From a technical point of view, it can realize the coordinated force bearing of each pier. However, this device is not only expensive, but also complicated to check and maintain later, and the operation and maintenance costs are high. Therefore, it is used in bridges. Less examples of earthquake resistance

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