Turnback project moves ahead

Article Abstract:

The projected completion of the Metro Muni Turnback (MMT) project in Sept. 1996 will alleviate the problems related to increased ridership in San Francisco's public transit system. Since the project started in Sept. 1993, new tunnels have been excavated for the underground switching and storage of MMT trains. Project completion has been hampered by wood pilings, debris, underground utilities, and existing tunnels present along the route of the MMT tunnel. Twin steel-lined tunnels were chosen for the soil type in the construction area.

Public works, Subways, San Francisco, California, Railroad tunnels

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Lifelike model

Article Abstract:

A research team at the University of California at Berkeley has proven that computer models can accurately predict the response of tall structures during an earthquake. The computer models correctly predicted the recorded floor displacements in amplitude and frequency. The researchers were studying seismic data from a 41-story office building taken during the Loma Prieta earthquake. The California Strong Motion Instrument Program which studies the response of tall structures during earthquakes funded the research.

Research, Earthquake engineering, Computer simulation

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Raising the bar on BART

Article Abstract:

This article examines the structural robustness of the Bay Area Rapid Transport system to withstand seismic shocks and the retrofit approaches that are being studied to ensure public safety, operation sustainability and minimization of damage. An evaluation of elevated guideway structures, stations, U walls, steel-lined tunnels is presented.

United States, Analysis, Maintenance and repair, Seismological research, Bay Area Rapid Transit, Tunnel lining

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