Full-prefabricated bridge swing self-resetting damping structure system for inverted T-shaped bent cap

Abstract

The invention relates to a full-prefabricated bridge swing self-resetting damping structure system for an inverted T-shaped bent cap. The system comprises two groups of prefabricated main beams, the prefabricated inverted T-shaped bent cap, a bearing platform, prestressed steel beams, two prefabricated bridge piers and a pile foundation, the top surface of the pile foundation is fixedly connected with the bottom surface of the bearing platform, the prefabricated bridge piers are vertically arranged on the bearing platform, the bottom face of the prefabricated inverted T-shaped bent cap is fixedly connected with the top faces of the two prefabricated bridge piers respectively, the two groups of prefabricated main beams are arranged on the shoulders of the two sides of the prefabricated inverted T-shaped bent cap respectively, U-shaped prestressed pipelines are arranged in the prefabricated bridge piers, the prefabricated inverted T-shaped bent cap and the bearing platform, the prestressed steel beams are arranged in the U-shaped prestressed pipelines, the end parts of the prestressed steel beams extend out of the U-shaped prestressed pipelines and then are fixedly connected with the prefabricated inverted T-shaped bent cap, and a swing interface is formed between the contact surfaces of the prefabricated bridge piers and the bearing platform. Compared with the prior art, the system has the advantages of being good in anti-seismic performance, low in construction difficulty, low in cost, convenient to overhaul and maintain and the like.

Description

technical field [0001] The invention relates to the field of bridges, in particular to a fully prefabricated bridge swing self-resetting shock-absorbing structural system for an inverted T cover beam. Background technique [0002] With the upgrading of urban planning and construction, building resilient cities is a new urban construction plan, and resilient disaster prevention is its main content. As a lifeline project, bridges are particularly important for seismic resilience, which requires bridges to be easily repaired after an earthquake. On the other hand, in recent years, the country has vigorously developed prefabricated buildings, and industrialized construction and prefabricated construction in the field of bridge engineering have also made great progress. The concept of prefabricated bridges has been extended from the superstructure to the substructure, and is rapidly developing towards fully prefabricated bridges. Fully prefabricated bridges are being used more ...

AI Technical Summary

Problems solved by technology

However, there are also some problems at the same time: the slab-type rubber bearings commonly used in all prefabricated bridges have weak deformation capacity, and are prone to slip and cannot self-reset during earthquakes, which does not meet the concept of toughness and earthquake resistance; in high-intensity areas, prefabricated bridge piers There are still few applications, and seismic design is a big problem

In recent years, scholars at home and abroad have discovered the anti-seismic advantages of rocking-self-resetting structures, and prefabricated rocking piers have become a hot research topic in the field of bridge engineering. Considering other aspects, there is still a long distance from the actual engineering application

First of all, unbonded prestressed tendons, as an important component of anti-overturning and self-resetting of swaying piers, often cause a certain degree of prestress relaxation and corrosion under normal use and earthquake action, which cannot be solved in the prior art. Maintenance and replaceability of unbonded prestressed tendons

Secondly, most of the current research focuses on single pier or pier-beam joints, and does not involve supports. The structural form and stress state of "box girder" are quite different, and the engineering applicability is weak

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