Double-limb thin-wall pier with swing self-resetting function and for rigid-frame bridge

Abstract

The invention discloses a double-limb thin-wall pier with a swing self-resetting function and for a rigid-frame bridge, belonging to the technical field of piers. The double-limb thin-wall pier comprises: a bearing platform; a girder, which is arranged right above the bearing platform; a double-limb pier, which is provided with two pier columns that are parallel to each other and used for supporting the girder, and structures at the joints of the double-limb pier, the bearing platform and the girder are swing structures and can swing at the joints; prestressed reinforcing steel bars, which are longitudinally fixed in each pier column of the double-limb pier, wherein one ends of the prestressed reinforcing steel bar extend out of the end parts of the pier columns of the double-limb piers, penetrate through the joints and extend into the corresponding bearing platform or the girder to be fixed; and ductile steel bars, which are arranged at the joints of the double-limb pier, the bearing platform and the girder, wherein one ends of the ductile steel bars extend into the end parts of the pier columns of the double-limb pier to be fixed, and the other ends of the ductile steel bars extend into the corresponding bearing platform or girder to be fixed. Such a swing pier self-resetting system is applicable to high-pier and large-span continuous rigid frame bridges, has great significance in improving the safety and disaster prevention capacity of high-pier and large-span bridges in mountainous areas, and is controllable in earthquake damage and high in post-earthquake recovery speed.

Description

technical field [0001] The invention belongs to the technical field of bridge piers, and more specifically relates to a swinging self-resetting double-leg thin-walled rigid-frame bridge piers. Background technique [0002] Most of the mountainous areas in western my country are located in the active zone of geological plates. Since ancient times, earthquakes have occurred frequently, which will cause huge damage to transportation infrastructure. With the development of transportation infrastructure in the western region, the continuous rigid frame bridge has become the main bridge type across the canyon terrain in the western mountainous area due to its advantages of large spanning capacity, strong terrain adaptability, and moderate cost. The pier of the bridge is getting higher and higher, constantly refreshing the original record, which not only brings opportunities for the development of continuous rigid frame bridges, but also poses new problems for the design and constr...

AI Technical Summary

Problems solved by technology

[0003]If the height of the pier column is greater than 40m, the quality of the main beam and the mass of the pier column will have an important impact on its seismic response. If the isolation design of the support is carried out to prolong the overall period of the structure On the contrary, it is unfavorable for shock absorption. Therefore, in most cases, the optimal design of the pier column section of continuous rigid frame bridges is based on the idea of ​​ductility design, relying on the bending deformation of the pier column itself to dissipate energy. The problem is that the traditional ductile design of the pier after the earthquake is severely damaged, the recovery period is long, and the cost of recovery is high. Even after repair, there is still a gap between the performance of the pier column and the intact pier column

Images