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Pdf link for Parsons pubication.

Seismic Design of Tunnels - A Simple State-of-the-Art Design Approach

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 ago PB’s engineers pioneered in these fields in the design and construction of the San Francisco BART system, whose toughness during earthquakes, including the
recent Loma Prieta event, has been amply tested. Recently, PB developed state-of-theart, two-level seismic design philosophy in its ongoing Los Angeles Metro and Boston
Central Artery/Third Harbor Tunnel projects, taking into account both performance-level and life-safety-level earthquakes.

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