Abstract
Long cast-in-place concrete bridges are often constructed in multiple frames separated by in-span hinges. The multi-frame system offers lower construction and maintenance costs, fewer adverse effects due to creep, post-tensioning, and thermal deformations as a few of its advantages. However, the seismic response of multi-frame bridges has been uncertain owing to the complexities of their discrete system. This study intends to improve the understanding of the seismic response of multi-frame bridge systems and evaluate the applicability of current design assumptions. Responses of multi-frame bridges and comparable single-frame bridges of the same length are compared. Seismic demands on multi-frame bridge columns, abutments, and in-span hinges were investigated through high-fidelity analytical simulations. Approximately 3400 nonlinear time history analyses of prototype bridges with realistic designs were performed using the OpenSees platform. Analysis of variance was implemented along with a factorial design to study the effect of several independent factors, including the number of frames, substructure system, unequal column heights, soil type, ground motion intensity, and capacity-to-demand ratio. It was observed for elastic dynamic analysis that a 90 % modal mass participation ratio is not adequate to accurately estimate dynamic responses. Seismic demands on columns in multi-frame bridges are typically smaller than those in comparable single-frame bridges. The multi-frame system is seismically more robust than the single-frame system, specifically for bridges spanning non-uniform valleys that include unequal column heights. To prevent longitudinal unseating at in-span hinges, it is critical to consider the interaction of transverse and longitudinal responses. The seismic damage to abutment backwalls and backfills in multi-frame bridges is expected to be extensive owing to small expansion joints.
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Acknowledgments
This research was a part of a project funded by the California Department of Transportation (Caltrans) under Contract #65A0464. Special thanks are given to Dr. Charles Sikorsky, Dr. Daryoush Tavatli, Mr. Marc Friedheim, Dr. Toorak Zokaie, Dr. Mark Mahan, Mr. Tom Ostrom, Mr. Mike Keever and Dr. Saad El-Azazy for their significant advice throughout this project. Assistance from Dr. Alicia Echevarria and Ms. Amanda McBride was also appreciated.
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This research was completed while Masoud Mehr was a Research Assistant at the University of Connecticut.
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Mehr, M., Zaghi, A.E. Seismic response of multi-frame bridges. Bull Earthquake Eng 14, 1219–1243 (2016). https://doi.org/10.1007/s10518-016-9882-y
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DOI: https://doi.org/10.1007/s10518-016-9882-y