Blog
May 2016

 

Otak’s Doug Sarkkinen and Greg Mines presented last week at the ODOT 2016 Bridge Design Conference in Salem.

Seismic design of bridges in Oregon currently uses state-of-the art probabilistic ground motion predictions. However, guidelines are based on horizontal ground movements under a seismic event and ignore the effects of vertical ground movement. Doug’s presentation provided a summary of expected vertical seismic ground movements and what types of bridges in Oregon would be vulnerable to these effects.

Greg’s discussion focused on the aging Fifth Plain Creek bridge that was replaced with a modern, precast concrete bridge. The stream channel was restored for improved fish habitat and to mitigate flood concerns.  The bridge construction used touch shoring to control concrete stresses and deflections in the slender structure during construction.

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