| Summary: | 碩士 === 國立高雄第一科技大學 === 營建工程所 === 94 === Abstract
The objective is aimed at assessing seismic performance of reinforced
concrete bridge piers. Based on ATC-40 performance-based seismic evaluation,
this paper adopts the capacity spectrum analysis to obtain the performance
point of pier structures and evaluate a bridge`s damage state according to
HAZUS99.
The capacity curve of a pier structures is built up through the
implementation of static push-over analysis. In order to be precise, this study
adopts stress strain relationship for confined concrete section from Mander`s.
First, the relationship between moment and curvature is determined through
concrete section analysis, which is then used to derive the relationship between
load and displacement through moment-area method. The push-over analysis
written in EXCEL VBA is effective in obtaining the capacity curve of pier
structures. In addition, experimental data of single columns and planar frames
are collected. These data are compared with the numerical results and show
satisfactory agreement.
The seismic response of bridge piers is simulated as vibration of
single-degree-of-freedom mass system. Time history analysis under real
earthquakes is conducted to obtain the elastic response spectrum. It is also
necessary to transform the capacity curve and elastic response spectrum into
capacity spectrum and demand spectrum of ADRS format. Inelastic hysteretic
behavior of pier structures is incorporated by applying effective damping to the
elastic spectrum.
Finally, a bridge case study is carried out following the above procedures
to assess its performance in real earthquakes.
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