Energy-Based Evaluation on Soil–Structure-Interaction-Related Damping of Inelastic Bridge Pier Structure Subjected to Pulse-like Velocity Ground Motion

Kuo-Hung Chao, Yu-Chi Sung (), Xiao-Qin Liu and Chin-Kuo Su
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Kuo-Hung Chao: Department of Civil Engineering, National Taipei University of Technology, Taipei 10608, Taiwan
Yu-Chi Sung: Department of Civil Engineering, National Taipei University of Technology, Taipei 10608, Taiwan
Xiao-Qin Liu: Research Center of Offshore Wind Power Engineering, National Taipei University of Technology, Taipei 10608, Taiwan
Chin-Kuo Su: Research Center of Offshore Wind Power Engineering, National Taipei University of Technology, Taipei 10608, Taiwan

Sustainability, 2023, vol. 15, issue 9, 1-17

Abstract: This study proposed a procedure of using the energy method to evaluate the SSI-related damping effect when the soil–structure interaction (SSI) was considered in a bridge pier system, which can thus be deemed a soil–foundation–superstructure (SFS) inelastic system. Firstly, the SSI is implemented by adopting a discrete-time recursive filter approach as well as frequency-dependent foundation–soil impedance functions to solve for the external soil forces exerted onto the foundation. Then, by integrating such external soil forces into the motion equations of the SSI-based SFS system, the energy equations can be formulated during the ground motions. To demonstrate the proposed procedure, an implementation study involving a bridge pier was carried out, considering two earthquake recordings. The resultant energy quantities and SSI-related damping ratio shed light on how the aspects of earthquake characteristics affected the energy dissipation mechanism of the bridge pier SSI-based SFS system. This proposed procedure renders a promising solution for quantifying the soil role in the seismic energy dissipation of arbitrary single- and multiple-degree-of-freedom systems considering the SSI effect. The results obtained show that the SSI effect was suppressed when the SFS system underwent near-fault earthquakes, which illustrated that the stiffness and damping contribution from the soil was not pronounced. Furthermore, near-fault earthquakes with large incremental velocities may lead to a low SSI-related damping ratio (SSIDR).

Keywords: discrete-time infinite impulse response filter (IIRF); soil–foundation–superstructure (SFS) system; structural inelasticity; energy quantity; SSI-related damping ratio (SSIDR) (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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