A double-column bridge pier structure with combined application of swing isolation

Abstract

A double-column pier structure for joint application of rocking and seismic isolation relates to the technical field of seismic isolation of bridge engineering. The top and the bottom of a pier are concrete-filled steel pipe sections, and the ends are sealed by steel plates. The bottom surface of the pier is placed in a groove of a grooved steel cushion of an upper bearing platform and is only connected by an angle steel damper. The groove of the grooved steel cushion of the upper structure is placed on the top surface of the pier, a roller seismic isolation support is arranged between the upper bearing platform and a lower bearing platform, and check blocks are arranged at two ends of the lower bearing platform. The double-column pier structure not only achieves a basic seismic isolationeffect, but also rocks the pier to protect the pier from plastic hinges, and the damper is adopted to achieve the function of dissipating seismic energy, so that the bridge structure has good seismicperformance. By means of the reasonable design of the double-column pier structure, the bridge main body structure can be damaged less after an earthquake, the damaged angle steel damper is very convenient to replace, and the maintenance cost is low.

Description

technical field [0001] The invention relates to the technical field of vibration reduction and isolation of bridge engineering, in particular to a double-column bridge pier with small damage and easy repair and combined application of swing vibration isolation. Background technique [0002] my country is located between the circum-Pacific seismic belt and the Eurasian seismic belt. Most of the country is an earthquake zone, especially the western part of my country is mostly a strong earthquake zone with frequent seismic activities. The bridge is a pivotal project of the traffic lifeline, and its construction cost is high. Once it is damaged by an earthquake, it will cause huge economic losses, and it is extremely difficult to repair after the earthquake. The number of casualties directly on the bridge was not many, but the economic losses and casualties caused by the damage and interruption of traffic lifelines were immeasurable, resulting in rescue personnel not being in p...

AI Technical Summary

Problems solved by technology

The bridge is a pivotal project of the traffic lifeline, and its construction cost is high. Once it is damaged by an earthquake, it will cause huge economic losses, and it is extremely difficult to repair after the earthquake

The number of casualties directly on the bridge is not many, but the economic losses and casualties caused by the damage and interruption of the traffic lifeline are immeasurable, resulting in the failure of rescue personnel to arrive in time, and many people have aggravated the earthquake disaster because they did not receive timely rescue.

At the same time, it is difficult to repair the damaged large bridges, which seriously affects the production and life in the disaster area and the post-disaster reconstruction work

The current seismic design of bridges is mainly based on the ductile seismic design of the hysteretic performance of reinforced concrete piers, but it is difficult to repair the damage and destruction of the plastic hinge area of ​​bridge piers

For medium-short bridge piers in high-intensity areas, it is not economical to rely solely on increasing the cross-section, and it is difficult to guarantee the ductility.

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