Dam Anchored to Foundation to Withstand Floods

by Edward A. Marcinkevich, Sen. Engr.; Philadelphia Electric Co., Philadelphia, Penn.,
Abraham Z. Ephros, Head; Struct. Dept., Water Resources Div., TAMS, New York, N.Y.,

Serial Information: Civil Engineering—ASCE, 1978, Vol. 48, Issue 4, Pg. 55-59

Document Type: Feature article


Federal Power Commission Order No. 315 required a safety review of Conowingo Dam and Powerhouse by an independent board of consultants. As recommended by this board, a study was made of the river system to determine a new probable maximum flood, an evaluation was made of the existing spillway capacity, and a complete stability analysis of the existing structures was performed. This study indicated that to pass the newly adopted spillway design flood and maintain structural stability under the resulting increased hydrostatic loading, it is necessary to install a post-tensioned anchorage system to tie the existing structures to the foundation rock. Design capacity of tendons ranges from 560 kips to 1003 kips. Test tendons are being monitored for long-term load loss. Installation of tendons is described in detail.

Subject Headings: Dam foundations | Existing buildings | Drop structures | Structural stability | Tendons | Floods | Spillways | Foundation design

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