Earthquake-resistant and shock-absorbing cast-in-place bridge without bearings and self-resetting

Abstract

The invention discloses a support-free self-restoring earthquake-resistant and damping cast-in-place bridge. Each pier column is mainly composed of a double interface swing pier, a replaceable energy consumption device, a cohesive-prestress-free steel cable and an anti-shearing device, wherein the upper structure of the double interface swing pier is separated from the lower structure of the double interface swing pier. Each double interface swing pier comprises a concrete pier column body and local structure measures arranged at the pier bottom and the pier top of the pier column body and on the top surface of a bearing table. Each replaceable energy consumption device comprises an energy consumption steel bar, a pier column pre-buried steel bar, a bearing table pre-buried steel bar, a steel bar connecting sleeve and an anti-buckling steel sleeve. Each cohesive-prestress-free steel cable comprises a cohesive-prestress-free steel cable body, a fixed end anchorage unit, a stretching end anchorage unit and an attaching pier bottom overhauling channel. Each anti-shearing device comprises an anti-shearing anchor bolt, an anchor bar and a corresponding steel plate hoop. According to the support-free self-restoring earthquake-resistant and damping cast-in-place bridge, when an earthquake comes, bridge upper structure translation can be effectively limited, and the girder falling risk can be avoided; and meanwhile, the structural earthquake damage is reduced, the structural damage degree is relieved, the bridge structural property after a large earthquake is ensured to enable a bridge subjected to the earthquake can be quickly restored.

Description

technical field [0001] The invention belongs to the technical field of bridges. It particularly relates to an anti-seismic and shock-absorbing technology of cast-in-situ bridges. Background technique [0002] At present, the seismic design methods of bridges at home and abroad are mainly divided into bridge ductility design and seismic isolation design. [0003] The ductile anti-seismic design is to increase the ductility of components so that they have sufficient plastic deformation capacity to produce plastic hinges under strong earthquakes, and dissipate seismic energy through elastic-plastic deformation. In the ductile seismic design, the expected plastic hinge area (usually in the reinforced concrete pier) is often configured to ensure that it is a ductile member by configuring stirrups, while the remaining parts are designed according to the ability to protect the members. [0004] The shock-absorbing and isolation design of bridges is divided into shock-absorbing de...

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Problems solved by technology

At the same time, for example, the design service life of laminated steel plate rubber shock-absorbing and isolation bearings (ordinary laminated rubber bearings, lead core rubber bearings, and high-damping rubber bearings, etc.) is much lower than the design service life of bridge engineering, which will significantly increase the Construction cost; while the seismic engineering design method based on ductility design and the traditional ductile structure form in the current code can only ensure that the structure will not collapse during the design earthquake, and more attention is paid to "do not collapse after a large earthquake" in the design, and there is a lack of earthquake resistance. Considering the performance of the post-earthquake structure, it is difficult to ensure the smooth flow of the "rescue lifeline" after the earthquake

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