Chapter
Apr 4, 2017
Dynamic Time History Response of Irregular Bridges
Publication: Structures Congress 2017
Abstract
Bridges are one of the most critical components of any transport infrastructure network, and their serviceability during earthquake is vital to ensure the safety of society. To be able to overcome bridge failure, code committees started to focus on different methods to design bridges under the effect of seismic forces. One of the challenges associated with Eurocode 8 and AASHTO-LRFD, which is not effectively addressed by code committees, is to withstand the failure of irregular bridges with unequal pier heights from seismic forces. EC8 currently uses “moment demand-to-moment capacity” ratios to ensure simultaneous failure of piers of bridges supported by piers of unequal heights, while AASHTO-LRFD relies on the relative effective stiffness of the piers. These regulations are not entirely valid, especially for bridges with piers of relative height of 0.5 or less, where in the case of earthquakes, they can experience a combination of shear and flexure failure modes. In this case, the shorter piers often result in a brittle shear failure, while the longer piers are most likely to fail due to flexure. This study aims to evaluate the adequacy of EC8 and AASHTO-LRFD design procedures for regular seismic behavior, by modeling various irregular bridges using shear-critical fiber-based beam-column elements. In this work the behavior of several irregular monolithic bridges is investigated. In addition, different methods of regularizing the bridge performance are examined in order to balance damage, with the ultimate aim of obtaining a simultaneous or near-simultaneous failure for all piers irrespective of the different heights and failure modes experienced.
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© 2017 American Society of Civil Engineers.
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Published online: Apr 4, 2017
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Research Assistant, Dept. of Civil Engineering, City, Univ. of London, London, U.K. E-mail: [email protected]
Royal Academy of Engineering Pell Frischmann Chair, Dept. of Civil Engineering, City, Univ. of London, London, U.K. E-mail: [email protected]
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ASCE Library Cards let you download journal articles, proceedings papers, and available book chapters across the entire ASCE Library platform. ASCE Library Cards remain active for 24 months or until all downloads are used. Note: This content will be debited as one download at time of checkout.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.