High-pier long-span narrow-bridge high-performance anti-seismic continuous rigid frame structure system

Abstract

The invention discloses a high-pier long-span narrow-bridge high-performance anti-seismic continuous rigid frame structure system which comprises multiple bridge piers, bridge abutments and a main girder. Each bridge pier adopts a transverse variable-cross-section sloping structure from the pier top to the pier bottom, and the transverse width of the pier top of each bridge pier is larger than the transverse width of the girder bottom of the main girder; expansion joints are formed between the two ends of the main girder and the bridge abutments, and a longitudinal constraint structure is arranged between one end of the main girder and the corresponding bridge abutment. According to the bridge structure system, due to the fact that each bridge pier adopts the condition that the transverse width of the pier top of the bridge pier is larger than the transverse width of the girder bottom of the main girder, each bridge pier adopts variable-cross-section design to form a transverse robust structure, and the longitudinal constraint structure is arranged between the main girder and the bridge abutment, it is guaranteed that the longitudinal rigidity and the transverse rigidity of the bridge system both can meet the seismic displacement control design requirement, and meanwhile the internal force of bridge pier longitudinal seismic design calculation is reduced, the safety of the bridge is guaranteed, the transverse seismic design strength and rigidity requirements are improved, and the high-pier long-span narrow-bridge high-performance anti-seismic continuous rigid frame structure system is especially suitable for bridge design requirements of mountainous super high bridge piers, large spans and narrow bridges.

Description

technical field

[0001] The invention relates to the field of bridge design, in particular to a high-performance seismic-resistant continuous rigid frame structure system of a high-pier, long-span, narrow bridge. Background technique

[0002] Existing bridges in mountainous areas have higher and higher heights and larger spans. Generally, bridge piers with a height of more than 100 meters are called high piers, and bridge piers with a span of more than 150 meters are called large collapses. Narrow bridges are generally for bridges In terms of width, a bridge with a span width of more than 150 meters and a width of more than ten meters can be called a narrow bridge. Therefore, such bridges with high piers, long spans and narrow bridges generally have a larger overall joint length. Since the basic seismic intensity of bridges in mountainous areas generally can reach degree VIII and above, the seismic performance of bridges is not only designed to control the strength, but also...

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