<p>This study, geared to advance the state of the art in earthquake engineering<br />of transportation tunnels, has the following goals:<br />&bull; To maintain a consistent seismic design philosophy and consistent design criteria both for underground structures ...

<p>For more than a century, Parsons Brinckerhoff (PB) has been instrumental in advancing state-of-the-art design and construction of underground structures, and the fields of seismic design and earthquake engineering are no exceptions. Almost three decades ...