Multi-pier system high in durability and resistant to earthquake collapsing and construction method

Abstract

The invention discloses a multi-pier system high in durability and resistant to earthquake collapsing and a construction method, and belongs to the field of bridge engineering. The system is mainly composed of a bearing platform, a middle pier, side piers, a prefabricated cover beam and others. All the piers are made from stainless steel tube concrete and prefabricated in a factory, anti-pull rings are arranged at the two ends of steel tubes, and non-bonding prestressed tendons are arranged in the middles of sections. The dimension of the section of the middle pier is larger than that of the side piers on the left side and the right side, and the steel tubes at the boundary positions of the middle pier, the bearing platform and the cover beam are annularly cut off after construction is completed. CFRP is wound around the upper ends and the lower ends of the side piers. According to the structural system, construction advantages of prefabricated structures are utilized, and the risk ofdurability is low in a normal using state. Under a strong earthquake, the middle pier is converted into a rocking-self returning system to prolong a structural natural vibration period without damageto the middle pier; axial bearing capacity of the multi-pier system is provided. Under the strong earthquake, the side piers are similar to steel tube concrete, can provide lateral strength, rigidityand energy consumption capacity, but bear small axial force, and will not collapse and get damaged.

Description

technical field [0001] The invention relates to a novel bridge multi-column pier, in particular to a bridge multi-column pier system adopting a prefabricated assembled structure and high durability and anti-seismic collapse design. Background technique [0002] Multi-column piers are widely used in the construction of large bridges in cities in my country. The current seismic design of multi-column piers of bridges is based on ductile seismic design, and plastic hinges are formed in the piers under strong earthquakes to consume seismic energy. However, the ductile anti-seismic design will first cause serious damage to the pier and large residual displacement after the earthquake, which is not conducive to the post-earthquake repair of the pier; and the pier with the ductile anti-seismic design still has a large risk of collapse and damage under strong earthquakes. [0003] Taking advantage of the construction advantages of the prefabricated assembly structure, prefabricatin...

AI Technical Summary

Problems solved by technology

Because the stress mechanism of the equivalent cast-in-place system is similar to that of the integral cast-in-place form, engineers and technicians are more sure of its safety during construction and use, but it is difficult to realize the earthquake damage control design of the structure for the equivalent cast-in-place system, and it is not easy to repair after the earthquake

Although the swing-self-resetting structural system is easy to realize the earthquake damage control design of multi-column piers, at present, engineers and technicians have insufficient confidence in its safety during construction and use.

The second key issue is that the durability of the prefabricated assembly structure system is worthy of attention, because prestressed tendons are used in the system, and the rocking-self-resetting system is artificially provided with rocking joints, and the external erosive medium is easy to invade the structure. detrimental to the durability of the structure

[0005] Based on the above background, the existing seismic design of multi-column piers is facing great difficulties

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