Abstract
The seismic performance of bridges depends on the ductile behavior of its column, as the deck and other substructural components except pile foundations are normally designed to be elastic to facilitate bridge retrofitting. Codes such as AASHTO, Caltrans, IRC: 112 etc. give guidelines for the seismic performance enhancement of columns through ductile detailing. In the present study, a methodology for the seismic performance enhancement of bridges is discussed by using a “Parameter-Based Influence Factor” (PIF) developed from factorial analysis. The parameters considered in the factorial analysis are: percentage of longitudinal reinforcement (P t), compressive strength of concrete (f′c), yield strength of steel (f y), spacing of lateral ties (S) and column height (H). The influence of each parameter and their combination on the limit states considered is estimated. Pushover analysis is used to evaluate the capacity of columns, considering shear failure criteria. A total of 243 (35 combinations) analysis results are compiled to develop ‘PIF’ used in the performance enhancement process. The study also encompasses other sub-objectives such as evaluating the discrepancies in using the Importance Factor (I) in designing bridges of varied functional importance; and estimating the aspect ratio and slenderness ratio values of bridge columns for its initial sizing.
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Abey, E.T., Somasundaran, T.P. & Sajith, A.S. Study on seismic performance enhancement in bridges based on factorial analysis. Earthq. Eng. Eng. Vib. 16, 181–198 (2017). https://doi.org/10.1007/s11803-017-0376-y
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DOI: https://doi.org/10.1007/s11803-017-0376-y