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Seismic damage control of bridge bents with double columns based on structural fuses |
QIN Hongguo,LI Ping,SHI Yan,WANG Rui |
School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China |
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Abstract Bridge bents with double columns are widely used in bridge substructure. However, bents have suffered serious damage in previous destructive earthquakes. According to the damage-control concept based on structural fuse, the lateral load and energy dissipation capacity of double-column bents can be improved by implementing replaceable energy dissipation devices. The energy dissipation capacity of buckling restrained brace (BRB) cannot be used to the full when arranged in chevron or single diagonal type. In this paper, the toggle-BRB system was developed, which can amplify the displacement and improve the energy dissipation of BRB. For the fuse system, the formula of the length range of BRB core controlled by dimensionless parameters such as material, geometric properties and displacement amplification factor of bents was derived. The three-dimensional contour charts of displacement amplification factor for reference in fuse design were drawn. Taking two double-column bents with different failure modes as examples for fuse design, and the parameters of BRB were determined. The dynamic analysis models were established respectively, and four groups of ground motions with different types were input for incremental dynamic analysis. The seismic isolation effects of chevron, single diagonal and toggle BRB systems on double-column bents under different intensities of ground motions were investigated. The results show that compared with chevron and single diagonal systems with the same conditions, the toggle BRB system has the best seismic isolation effect. BRB, whose deformation is amplified, plays a full role in deformation and energy dissipation, and can control the seismic damage of double-column bents in the state of slight damage or even elastic. The seismic isolation effect of chevron BRB system is the worst.
Keywords: bridge bent; structural fuse; buckling restrained brace; toggle-BRB system; energy dissipation
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Received: 23 September 2021
Published: 28 July 2022
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