Bulb-tees make more efficient long-span bridges

Article Abstract:

Prestressed bulb-tee girders are the most structurally-efficient and cost-effective options in the US for the construction of long-span bridges that are longer than 80 ft. Bulb-tee beams have a narrower middle where there is less stress and thicker top and bottom flanges to create a girder that has more inertia at the same amount of material as older girders. The new bridge across the Olentangy River in Columbus, OH, was constructed with less I-beams because of the use of the new technology. Engineers estimate that the girders produced savings of about $500,000 on a $3.5 million bid.

Usage, Innovations, Buildings and facilities, Bridge construction, Girders, Beams (Structural), Columbus, Ohio

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World's longest glass span covers botanic garden in Wales

Article Abstract:

The National Botanic Garden of Wales will open on Apr 2000 and one of its significant features will be the Great Glasshouse, an oval-shaped structure having the longest span of glass. The glasshouse has 24 tubular steel arches ending in stainless ball and socket joints which allow the placement of different angles from which the steel components meet the concrete substructure. Schal International Management is the contractor of the project's structure while Anthony Hunt Associates is designer of the glasshouse.

Management, Design and construction, Glass construction, Greenhouses, Botanical gardens

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Chemical tempering yields stronger glass

Article Abstract:

Pennsylvania State University professor David Green, ceramics engineer Raj Tandon and University of Trento ceramics engineering professor Vincenzo Sglavo conducted a research on a new type of glass. The glass was put through a two-stage tempering process to shift its strength to just below the surface from the surface. The heat- and chemical-tempered glasses were found to withstand more stress before breaking than untreated glass and gives a warning sign, in the form of internal cracks, before breaking.

Research, Analysis, Production processes, Glass, Strength of materials, Strength (Materials), Glass research

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