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Earthquakes and Structures
  Volume 16, Number 6, June 2019, pages 691-704

Numerical simulation of bridge piers with spread footings under earthquake excitation
Jiunn-Shyang Chiou, Yi-Wun Jheng and Hsiao-Hui Hung

    This study simulates the responses of large-scale bridge piers under pseudo-dynamic tests to investigate the performance of four types of numerical models that consider the nonlinear behavior of the pier and the rocking behavior of the footing. In the models, beam-column elements with plastic hinges are used for the pier, two types of foundation models (rotational spring and distributed spring models) are adopted for the footing behavior, and two types of viscous damping models (Rayleigh and dashpot models) are applied for energy dissipation. Results show that the nonlinear pier model combined with the distributed spring-dashpot foundation model can reasonably capture the behavior of the piers in the tests. Although the commonly used rotational spring foundation model adopts a nonlinear moment-rotation property that reflects the effect of footing uplift, it cannot suitably simulate the hysteretic moment-rotation response of the footing in the dynamic analysis once the footing uplifts. In addition, the piers are susceptible to cracking damage under strong seismic loading and the induced plastic response can provide contribution to earthquake energy dissipation.
Key Words
    damping; plastic hinges; rocking; seismic design; spread footings; Winker models
Jiunn-Shyang Chiou, Yi-Wun Jheng: Department of Civil Engineering, National Taiwan University, No. 1, Section 4, Roosevelt Rd., Taipei, Taiwan 10617, Republic of China
Hsiao-Hui Hung: National Center for Research on Earthquake Engineering, 200, Section 3, Xinhai Rd., Taipei, Taiwan 10668, Republic of China

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