A connection structure between pier and cap with additional mild steel damper

Abstract

The invention relates to a connection mode of a pier and a bearing platform through additional mild steel dampers, and belongs to the field of bridge engineering. According to the connection mode, mainly a reinforced concrete pier section, a concrete-filled steel tube pier section and additional mild steel dampers are arranged, wherein the section of a concrete-filled steel tube is a reduced scale section, and the vertical bearing capacity of the concrete-filled steel tube section with the reduced scale section is not lower than that of the reinforced concrete section; the additional mild steel dampers are arranged between the top of the bearing platform and the bottom of the reinforced concrete section. Under the effect of earthquakes, the plasticity deformation of the pier is focused on the concrete-filled steel tube section, so that a plastic hinge release pier bottom bending moment is formed; besides, the reinforced concrete section swings around a hinge to stimulate the mild steel dampers to resist earthquake force and dissipate earthquake energy. The energy consumption characteristics of the mild steel dampers can have protective effects on the concrete-filled steel tube section, through reasonable design, the concrete-filled steel tube section can be used only with slight repair and maintenance after the earthquakes, the damage of the main structure of a bridge is small, the normal service of the bridge is not influenced, and the damaged mild steel dampers are convenient to exchange.

Description

technical field [0001] The invention relates to the technical field of shock absorption and isolation of bridge engineering, in particular to a bridge pier and bearing platform connection structure with an additional mild steel damper that is less damaged and easy to repair under the action of an earthquake. 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 immeasurab...

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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