Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Failure of Tieback Wall Anchors due to Corrosion
Tieback anchors for a sheet pile retaining wall failed due to corrosion resulting in the near collapse of the wall. The sheet pile retaining wall, with a sloping backfill, was designed with drainage backfill and grouted anchors angled down at 20 degrees from horizontal. Corrosion protection was specified for the sheeting and the anchors. Part of the wall was parallel to and within about 10 feet of the owner's building. Finite element analysis was used to evaluate staged construction and to estimate the lateral forces imposed on the adjacent building foundations. The contractor deviated from the specifications in several respects and the owner accepted a credit in return for eliminating corrosion protection from the sheeting and anchors. Two years after completion of the wall, the owner notified the engineer that several anchors had failed. Investigation revealed that up to 25% of the anchor's cross section was lost in just two years due to corrosion. Installation damage was also identified as a possible contributing factor in the failure. The problem was corrected by excavating to expose the anchors, replacing the corroded length of the anchor rods, providing corrosion protection, replacing a portion of the backfill with approved material, installing isolation pads under the anchor bearings, and implementing drainage improvements.
Failure of Tieback Wall Anchors due to Corrosion
Tieback anchors for a sheet pile retaining wall failed due to corrosion resulting in the near collapse of the wall. The sheet pile retaining wall, with a sloping backfill, was designed with drainage backfill and grouted anchors angled down at 20 degrees from horizontal. Corrosion protection was specified for the sheeting and the anchors. Part of the wall was parallel to and within about 10 feet of the owner's building. Finite element analysis was used to evaluate staged construction and to estimate the lateral forces imposed on the adjacent building foundations. The contractor deviated from the specifications in several respects and the owner accepted a credit in return for eliminating corrosion protection from the sheeting and anchors. Two years after completion of the wall, the owner notified the engineer that several anchors had failed. Investigation revealed that up to 25% of the anchor's cross section was lost in just two years due to corrosion. Installation damage was also identified as a possible contributing factor in the failure. The problem was corrected by excavating to expose the anchors, replacing the corroded length of the anchor rods, providing corrosion protection, replacing a portion of the backfill with approved material, installing isolation pads under the anchor bearings, and implementing drainage improvements.
Failure of Tieback Wall Anchors due to Corrosion
Esser, Alan J. (Autor:in) / Dingeldein, John E. (Autor:in)
Geo-Denver 2007 ; 2007 ; Denver, Colorado, United States
14.10.2007
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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