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New Cables for Old

by Rita Robison, Assoc. Ed.; Civil Engineering�ASCE, New York, N.Y. 10017,


Serial Information: Civil Engineering—ASCE, 1985, Vol. 55, Issue 9, Pg. 68-71


Document Type: Feature article

Abstract:

In an eingineering first, the main suspension cables will be replaced on New York City's Williamsburg Bridge without closing it to traffic at any time. According to the design by Ammann & Whitney, a single new cable will be placed between each of the existing pairs and anchored in new concrete blocks. The new cables, 24 in. diameter, will be attached to the suspended structure by a pair of ropes at each stiffening truss panel point. As load is added to the cables, the new saddles will be jacked in steps. At the same time, the existing saddles will be jacked in the opposite direction as the existing cables are unloaded. The load will be jacked into new suspender ropes at alternate panel points, then the ropes in between will be loaded and attached. The engineers believe that this design for rehabilitation is preferable to construction of a replacement bridge.

Subject Headings: Cables | Load factors | Jacking | Cable stayed bridges | Suspension bridges | Suspended structures | Suspended loads

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