Evaluation of seismic response of bridges under asynchronous excitation and comparisons with Eurocode 8-2 provisions |
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| Authors: | Anastasios G Sextos Andreas J Kappos |
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| Institution: | (1) Department of Civil Engineering, Aristotle University of Thessaloniki, Thessaloniki, Greece |
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| Abstract: | The paper aims to evaluate the way Eurocode 8 treats the consideration of asynchronous earthquake ground motion during the
seismic design of bridges, and to discuss alternative solutions for cases wherein existing provisions do not lead to satisfactory
results. The evaluation of EC8-2 new provisions and simplified methods is performed through comparison with a more refined
approach whereas an effort is made to quantitatively assess the relative importance of various design and analysis assumptions
that have to be made when spatial variability of ground motion is taken into consideration, based on the study of the dynamic
response of 27 different bridges. It is concluded that, despite the complexity of the problem, there are specific cases where
EC8 provisions can be safely and easily applied in practice, while in other cases ignoring the effect of asynchronous excitation
or performing simplified calculations can significantly underestimate the actual seismic demand. |
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| Keywords: | Bridges Seismic design Earthquakes Ground motion Spatial variability |
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