Numerical simulation of bridge piers with spread footings under earthquake excitation
Journal
Earthquake and Structures
Journal Volume
16
Journal Issue
6
Pages
691-704
Date Issued
2019
Author(s)
Abstract
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 foot ing 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 th e distributed spring dashpot foundation model can reasonably capture the beha vior 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 plast ic response can provide contribution to earthquake energy dissipation.
SDGs
Type
journal article