Corroded Anchor Structure Stability/Reliability (CAS_Stab-R) Software for Hydraulic Structures
ERDC-ITL Vicksburg United States
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This report describes software that provides a probabilistic estimate of time-to-failure for a corroding anchor strand system. These anchor systems are installed to preserve and extend the service life of U.S. Army Corps of Engineers hydraulic structures. Corrosion reduces the cross-section area of steel cables until the cable capacity is less than the tension force applied when the anchor cable was initially installed. When enough material is lost from the cable anchor that the cable capacity is less than the lock-off load of the anchor, the anchor will fail and no longer provide stability to the structure. A series of unique pull-test experiments conducted by Ebeling et al. 2016 at the U.S. Army Engineer Research and Development Center provided the required statistical relationships of reduced seven-strand cable capacity to 1 corroded cross-section area and to 2 corroded cross-section minimum short axis diameter for failed cable strands. The software product Corroded Anchorage Structural Stability and Reliability CASStab-R produces probabilistic Remaining Anchor Life time estimates for anchor cables based upon the direct corrosion rate for the installation. CASStab-R can also perform a probabilistic analysis to determine the Probability of Unsatisfactory Performance for a structural model cross section founded on rock.
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