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Title: Practical Nonlinear Time-History Analysis for the Design of Bridge Structures Subjected to Strong Seismic Motion Author(s) and Affiliation(s): Robert Dowell, Frieder Seible and M. J. Nigel Priestley Department of Structural Engineering University of California, San Diego, La Jolla, CA Principal Investigator: Frieder Seible Sponsor(s): California Department of Transportation Research Start Date: 1994 Expected Completion Date: 1997 Research Objectives: The primary objective of the current research is to investigate the practicality of replacing traditional elastic seismic response bridge analysis with more refined nonlinear time-history methods, with emphasis on reinforced concrete bridge structures. Currently, such efforts are only employed for large or important structures, leaving the majority of bridges to be designed by linear elastic methods. The resistance to adopt nonlinear time-history methods for the design of bridges is understandable, considering the added effort required. However, the benefits of such analyses, even for simple structures, may outweigh the added expenditure as long as reliable analytical tools and analysis procedures are available. The development of required analytical tools for the current research is discussed. Expected Products or Deliverables: It is expected that through the use of the new fiber model (extending the existing experimental database), the required parameters of the pivot hysteresis model will be provided in graphical form, simply as a function of longitudinal steel percentage and axial load ratio (for a given section). It is hoped that this research will lead to wider acceptance of nonlinear tools for the design of bridges subjected to large seismic motion.

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