Performance based Seismic EvaluationOf Concrete Pier Columns

• Main Authors: Bo-So Tseng, 曾柏碩
• Other Authors: Ching-Jong Wang
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/26553205073886657501

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.