Multi-Truss Design for Tower

Serial Information: Civil Engineering—ASCE, 1985, Vol. 55, Issue 7, Pg. 53-53

Document Type: Feature article


A modified structural steel system of outrigger trusses and belt trusses bolster the 54-story Equitable Tower West. Located in New York City, the building's structural system has two levels of outrigger trusses at the 11th and 36th floors. The transfer exterior columns at those floors take windloads at those floors and engage all the columns across the building. When the building deflects, the load comes through the outrigger trusses which bring the exterior columns into play. The design decreases deflection and eliminates many moment connections on the girders framing into the columns in the north/south direction. Belt trusses connect to the outrigger trusses and assist in the distribution of wind shear, moments, and eccentric loading.

Subject Headings: Trusses | Columns | Floors | Steel structures | Building systems | Displacement (mechanics) | Eccentric loads | Steel | New York City | New York | United States

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