A hybrid anti-seismic system of double-column piers for irregular bridges in mountainous areas

Abstract

The invention provides a mixed earthquake-proof system with two column piers for an irregular bridge in a mountainous area, and belongs to the field of bridge engineering. The system is mainly composed of a high pier, a short pier, a cover beam, a bearing platform, pile foundations, non-bonded FRP (Fiber Reinforced Plastic) ribs, stainless steel tubes, replaceable tension and compression energy consumption devices, screw rods, bolts, steel base plates and anchor bars, wherein the short pier is prefabricated on the site, and two ends of the short pier and the joints of the bearing platform andthe cover beam form a swing structure; the high pier and the connecting part of the bearing platform and the cover beam are integrally cast in place; the short pier is sleeved with the stainless steeltubes, and the replaceable tension and compression energy consumption devices are arranged at the top and bottom of the pier; and the non-bonded prestressed FRP ribs are arranged at the center of thecross section of the high pier and the center of the cross section of the short pier. The system consumes energy through the replaceable tension and compression energy consumption devices under a strong earthquake, and the damaged replaceable tension and compression energy consumption devices after the earthquake can be replaced conveniently. The stainless steel tubes can inhibit damage to concrete under the strong earthquake, and furthermore, both the stainless steel tubes and the FRP ribs can increase the durability of bridge piers. The system is high in earthquake resistance and convenientto construct.

Description

technical field [0001] The invention relates to a bridge pier, in particular to a double-column pier of an irregular bridge in a mountainous area, which is used in combination with a rocking structure and an integral cast-in-place structure. Background technique [0002] In order to adapt to the slope terrain, a large number of mountainous double-column piers built along the mountain are typical irregular double-column piers, and the height difference between the high pier and the short pier is large. Under strong earthquakes, the low pier has high rigidity and bears most of the seismic force, but the low pier is a typical short column with poor seismic deformation capacity; and under the earthquake action of the transverse bridge, the low pier bears the significant influence of variable axial force; However, under the seismic action of the longitudinal bridge, the low pier bears the influence of torsion at the same time due to the uncoordinated deformation of the high and l...

AI Technical Summary

Problems solved by technology

[0004] Based on the above background, the seismic design of double-column piers of irregular bridges in mountainous areas is facing great difficulties, and the rocking structural system with good seismic capacity is not suitable for large-scale use in bridge construction in mountainous areas.

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