ATLSS Center to field tests beam-to-column connection

Article Abstract:

The Center for Advanced Technology for Large Structural Systems (ATLSS) at Lehigh University is testing an innovative beam-to-column connection. A beam with a solid and a tapered extension is mounted on a column through a three-dimensional guide. The technique forms a cross connection that can be used as a quicker, safer and cheaper erection method. The connection wasused in installing the first-floor roof bay of a chemical plant. The work was done with a boom crane and two workers with guy wires. The total time for erecting the roof bay was just 30 minutes.

Methods, Installation, Steel, Structural, Structural steel, Prestressed steel construction

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Targeted freezing tests soil stability

Article Abstract:

The Canadian Liquefaction Experiment has resulted in the development of a targeted freezing method to minimize the cost of core soil sample testing. The technique involves installation of two-in-diameter casing up to the bottom of the targeted soil layer. Water is then introduced from the top of the pipe during drilling, after which a 1.5-ft layer of bentonite pellets are poured into the bottom of the casing. Operators then inject a tube into the casing through which liquid nitrogen is poured, thereby causing the bentonite pellets to freeze.

Usage, Testing, Bentonite, Soil liquefaction, Liquefaction (Geology), Soil stabilization

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Transforming Crissy Field

Article Abstract:

This article discusses the restoration and transformation of the Presidio's Crissy Field, a former military airfield and industrial storage yard, along the San Francisco Bay, into a waterfront park by coastal engineering planning and design work. The main structural addition is a temporary low 220 feet long seawall underneath the surface. In addition, 20 acres of a tidal salt marsh ecosystem is restored with native plants.

United States, Environmental aspects, Design and construction, Remodeling and renovation, Waterfront development, San Francisco Bay, Coastal zone management, Sea-walls, Seawalls

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