Variable-friction large-span long-connection continuous beam system

Abstract

The invention relates to a variable-friction large-span long-connection continuous beam system. The system comprises a beam body, a pier body which is supported below the beam body, a foundation, and a variable-friction support which is arranged between the beam body and the pier body. According to the variable-friction large-span long-connection continuous beam system, under the normal operation load effect, the relative sliding face of the beam body and the pier body is a plane, when the beam body stretches out and draws back, the elevation of a bridge floor is not changed, the driving safety of a high-speed railway is not affected, the friction coefficient of the sliding face is low, and the size of the pier body of the lower structure can be reduced; under the action of a rare earthquake, the relative sliding surface of the beam body and the pier body is a spherical surface, so that the natural vibration period of a bridge structure can be prolonged, the earthquake response can be reduced, the anti-seismic property of the large-span long-connection continuous beam system can be improved, and meanwhile, the spherical sliding surface has a relatively high friction coefficient and plays a role in energy consumption.

Description

technical field [0001] The invention relates to the technical field of high-speed railway bridge engineering, in particular to a large-span and long-connected continuous beam system with variable friction resistance. Background technique [0002] At present, the simply supported beam structure is usually the preferred structural form of high-speed railway bridges, and its economic span is within 50m. In order to meet the requirements of seamless railway rail force and driving comfort, the substructure has the minimum longitudinal horizontal line stiffness requirements, according to this design The pier body size is large. In order to meet the flood control requirements of the cross-river bridge, the water resistance rate of the substructure of the bridge should not exceed 5%, so the simply supported beam structure is limited. The continuous beam structure has a large span, and there is no minimum rigidity requirement for the movable pier. Set the track telescopic regulator...

AI Technical Summary

Problems solved by technology

[0005] The embodiment of the present invention provides a large-span long-connected continuous beam system with variable friction resistance, in order to meet the seismic energy consumption requirements of the large-span long-connected continuous beam system in the related art, the friction pendulum support is used, causing the support to follow the beam body When slippage occurs on the spherical surface, the height of the support increases and the beam body rises, which affects the driving safety of the high-speed railway; at the same time, the friction coefficient of the friction pendulum support is large, and the top of the movable pier is subjected to a large level under normal operating loads. Frictional resistance, large substructure size, and high engineering cost

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