Sensitivity analysis of parameters influencing ED and self-centering capacity in self-centering bridge bents with ED beams using validated numerical model

Abstract

A self-centering bridge bent equipped with energy-dissipation (ED) beams is proposed. Quasi-static tests are conducted on self-centering bridge bents, both with and without ED beams, to validate the accuracy of the corresponding numerical models. The effects of various parameters, such as the web area of ED beams, prestressing force of tendons, tendon arrangements, and number of column segments, on the seismic performance of self-centering bridge bents with ED beams are evaluated using the validated numerical model. The results demonstrate that the numerical models accurately replicate the quasi-static test results, with average errors in the lateral force remaining below 9.6%. The web area of ED beams significantly affects the strength, cumulative energy dissipation, and relative self-centering index (RSI) of the self-centering bridge bents. Increasing the prestressing force enhances the lateral force and self-centering capability of the bridge bents but has minimal effect on their ED capacity. Reducing the number of segments in each column enhances the lateral force and cumulative hysteretic energy dissipation of the self-centering bridge bents while exerting an insignificant effect on the RSI. Thus, the proposed novel system is highly suitable for double- or multicolumn piers supporting bridges in regions prone to strong earthquakes.

Keywords

self-centering bridge bents / energy-dissipation beams / energy dissipation / self-centering capacity / quasi-static test / numerical validation

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Funding

National Natural Science Foundation of China(52278189)

Zhejiang Provincial Natural Science Foundation of China(LY24E080002)