Papers by Jón Guðni Guðmundsson
In this paper a study of a composite steel-concrete arch bridge under earthquake load with specia... more In this paper a study of a composite steel-concrete arch bridge under earthquake load with special emphasis on near fault effects is presented. The new bridge over Þjórsá river, built in 2003, was chosen for the study. It is located in the South Iceland seismic zone where earthquakes of magnitude 7.0 can be expected. In this zone there are a lot of active seismic faults and the distance between them is relatively short. An effort was made to analyze near-fault effects in recorded time histories from the South Iceland earthquakes of 2000 and 2008. A simple method to add near-fault velocity pulses to far-fault time histories was introduced. A Finite Element model of the bridge was constructed, then recorded and simulated time series were used to study the effect of the near-field pulses. Work was done to study the effects of rotating the horizontal earthquake time series. This was carried out to test how much effect the direction of the earthquake fault has on the bridge. The main conclusion was that near-fault pulses greatly affected the response of the bridge and are likely to affect structures with long natural periods (> 1s).
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Papers by Jón Guðni Guðmundsson