{"id":3936,"date":"2015-08-21T16:28:11","date_gmt":"2015-08-21T16:28:11","guid":{"rendered":"http:\/\/www.www.terre-armee.fr\/?p=3936"},"modified":"2020-01-10T18:55:56","modified_gmt":"2020-01-10T18:55:56","slug":"usa-bay-area-transit-bart-warm-springs-extension","status":"publish","type":"post","link":"https:\/\/www.terre-armee.fr\/en\/usa-bay-area-transit-bart-warm-springs-extension\/","title":{"rendered":"USA – Bay Area Transit (BART) – Warm Springs Extension"},"content":{"rendered":"

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Major construction on the Warm Springs Extension in Fremont, CA began in August of 2009 and will continue until the fall of 2015. This project will add 5.4-miles of new track south from the existing Fremont Station to a new station in the Warm Springs District of the City of Fremont.<\/h2>\n

The Reinforced Earth Company (RECo) was selected to design and supply the four MSE walls for this project that included two technically complex structures.<\/p>\n

The two walls supporting Walnut Avenue Bridge are the\u00a0first RECo MSE walls supporting a true abutment for CALTRANS, the California Department of Transportation. In a true Reinforced Earth abutment, the bridge beams are supported on a spread footing bearing directly on the MSE structure. One of these two walls is also the\u00a0first MSE wall in the U.S. that is constructed directly above a seismic fault line.<\/p>\n

The two abutment walls were designed to accommodate a horizontal seismic acceleration coefficient of 0.75g with a maximum allowable seismic lateral deformation of 2 inches. Due to these extremely high seismic design parameters, both the reinforcing strip lengths and densities are over 2.5 times the norm for a wall of this scale.<\/p>\n<\/div>

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Localisation<\/h2>\n<\/div>