Highway and railway dual-purpose double-layer bridge bent frame pier earthquake damage control system

Abstract

The invention discloses a highway and railway dual-purpose double-layer bridge bent frame pier earthquake damage control system and belongs to the field of bridge engineering. The system is mainly composed of a bearing platform, bottom-layer split column piers, a bottom-layer bent cap, top-layer piers, a top-layer bent cap, friction energy dissipation sheets, energy dissipation inclined struts, non-bonding prestress ribs, split columns and the like, wherein all the piers adopt concrete-filled steel tubes. The bottom-layer split column piers are in an integral force bearing mode when normally used, the two ends of each bottom-layer split column pier are almost solidified, the two ends of each split column are transformed into a swing-self-reset system under a strong earthquake, and energy dissipation capacity is provided through the friction energy dissipation sheets between the split columns. The connecting portions between the top-layer piers and the bottom-layer bent cap and betweenthe top-layer piers and the top-layer bent cap are arranged in a swing-self-reset mode, and energy is dissipated through the energy dissipation inclined struts. Through transformation of a bottom-layer split column pier force bearing system and a swing-self-reset reaction of the top-layer piers, earthquake damage control design of a highway and railway dual-purpose double-layer bridge bent frame pier is achieved, the earthquake damage of the structure under the strong earthquake is greatly reduced, and the system is easy to repair after the earthquake.

Description

technical field [0001] The invention relates to a new type of bridge pier, in particular to a double-layer bridge bent pier for both highway and railway uses with a swing-self-resetting structure and novel split column technology. Background technique [0002] In the large-scale bridge projects spanning large rivers in my country, the approach bridges generally adopt the dual-purpose form of road and rail, forming special double-layer bridge bent piers. The lower layer is a railway bridge, and the upper layer is a road bridge. For the lower railway bridge, in order to meet the rigidity requirements of railway traffic, the pier body has a large cross-section, which is a typical short pier, which is prone to damage due to strong seismic forces under strong earthquakes. For the upper highway bridge, due to the earthquake vibration amplification effect of the lower bridge piers, the magnitude of the earthquake vibration suffered by the upper highway bridge has increased signifi...

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Problems solved by technology

[0004] Based on the above background, the seismic design of the existing double-deck bridge piers for highway and railway is facing great difficulties

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