A box-shaped steel bridge pier with stiffened energy-dissipating wall plates at the root

Abstract

The invention discloses a box type steel pier with stiffening energy dissipation wall boards arranged on the root. The steel pier comprises a box type steel pier body and an energy dissipation body, wherein the energy dissipation body comprises four high-strength steel panels and four low-yield-point steel panels, a square frame is defined by the four high-strength steel panels, every two adjacent high-strength steel panels are fixedly welded together, openings are formed in the four high-strength steel panels, the four low-yield-point steel panels are embedded into the four openings respectively and correspondingly, the low-yield-point steel panels and the high-strength steel panels are connected in a detachable mode, and the high-strength steel panels and the box type steel pier body are fixedly welded together. The steel pier has the advantages that the high-strength steel panels can play a role as a stress framework of the box type steel pier to provide sufficient bearing capacity and rigidity for the pier; furthermore, due to the fact that the extreme elastic strain value of the high-strength steel panels is large, the yield energy dissipation of the stiffening low-yield-point steel panels can be guaranteed, the ductility and anti-seismic property of the box type steel pier are made excellent, construction is convenient and fast, and post-earthquake damage detection and quick repairing are facilitated.

Description

technical field [0001] The invention relates to the technical field of steel bridge piers, in particular to a box-shaped steel bridge piers. Background technique [0002] The bridge is a "top-heavy" structure, and most of the mass is concentrated in the upper structure. Under the action of earthquake vibration, the horizontal seismic force will concentrate on the upper structure and be transmitted to the lower pier through the upper structure. Compared with the lower pier, the upper structure of the bridge The strength and stiffness in its horizontal plane are large enough, therefore, the lower pier is the key component of the bridge structure to resist the horizontal earthquake force. At present, bridge piers at home and abroad generally adopt the form of reinforced concrete structure. This form of bridge piers has good compressive performance, but poor ductility. Emergency rescue and disaster relief brought troubles and caused huge indirect losses. As the main component ...

AI Technical Summary

Problems solved by technology

However, due to the thin wall plates of box-shaped steel piers, local buckling deformation of the wall plates at the root of box-shaped steel bridge piers is prone to occur during earthquakes, resulting in a sharp deterioration in the seismic performance of box-shaped steel bridge piers

[0004] In order to improve the ductility of the root of the box-shaped steel pier, the common practice in engineering is to fill concrete within about 1 / 3 of the root of the steel pier. Although this method can make the root of the box-shaped steel pier less prone to deformation, the concrete filling It will increase the self-weight of the box-shaped steel pier, which will increase the cost of pier foundation treatment, making the construction cost of the box-shaped steel pier higher. On the other hand, it will bring difficulties to the damage detection and reinforcement of the box-shaped steel pier after the earthquake. The outstanding advantages of shaped steel piers, such as light weight, quick on-site construction, and quick repair and reinforcement after earthquakes, are greatly limited.

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