Earthquake Analysis of Hualien Large Scale Seismic Test Structure Considering Nonlinear Soil Behavior

摘要

This paper presents the earthquake response analysis results on a large-scale seismic test structure which was built in Taiwan. The present analysis is carried out using a computer code KIESSI, which has been developed based on the axisymmetric finite element method incorporating infinite elements for the far-field soil region. The nonlinear behavior of the soil media is taken into account using an iterative procedure of the equivalent linearization. Two sets of the soil and structural properties are utilized as the initial properties. They are the unified model which were porivded by the group in charge of the experiments and the correlated model obtained from the correlation analysis using the forced vibration test (FVT) results. Three components of the ground acceleration time histories are artificially generated through an averaging process of the Fourier amplitude spectra of the ground accelerations measured near the test structure, and they are used as the control motions for earthquake analysis. It has been found that the predicted earthquake responses obtained using the generated control motions and the equivalent nonlinear procedure with the FVT-correlated model as the initial linear properties are compared very well with the observed responses.