Computer Cuts Tower Steel

by Howard Smallowitz, Asst. News Editor; Civil Engineering—ASCE, 345 E. 47th St., New York, NY 10017,

Serial Information: Civil Engineering—ASCE, 1986, Vol. 56, Issue 3, Pg. 72-74

Document Type: Feature article

Abstract: Two computer programs developed by Lev Zetlin Assoc., New York City, revealed that some of the steel in what will be Philadelphia's tallest building, One Liberty Place, was not pulling its weight. A series of outrigger trusses will connect the building's core to its exterior columns, combining their strengths. The computer programs revealed the optimum spacing for these outriggers, allowed the building's designers to eliminate a number of structural systems, and showed where added steel would be most effective in reducing deflection.

Subject Headings: Bracing | Computer models | High-rise buildings | Optimization | Spacing | Trusses

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