Sealing the subway

Article Abstract:

Issues discussed concern the design and construction of a subway system in Los Angeles, California, focusing on the design challenge posed by anticipated earthquakes and hazardous subsurface gases. Topics addressed include the structural integrity of the tunnels, and the use of high-density polyethylene membranes to keep dangerous gases out of the system.

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Saving the Williamsburg Bridge

Article Abstract:

The article discuses reconstruction of the Williamsburg Bridge of New York City for restoration of the city's transportation network. The project includes rehabilitation of the cable suspension system and towers, reconstruction of the roadways, and addition of a secondary top chord to the stiffening trusses.

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Spiraling truss highlights new subway station in Boston

Article Abstract:

This article reports installation of a three-dimensional steel struss signature sign for a new subway station near Logan Airport, Boston. The structure is 260 feet long designed by Weidlinger Associates, Inc., of Cambridge, Massuchusetts.

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