Calibration of Reliability-Based Resistance Factors for Flush Drilled Soil Anchors in Taipei Basin
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 134, Issue 9
Abstract
The goal of this research is to calibrate the reliability-based resistance factor of flush drilled soil anchors for their ultimate pullout capacities based on in situ anchor pullout test data in the alluvial soil underlying the Taipei Basin. Efforts are taken to quantify the uncertainties with a full probabilistic analysis approach. The resistance factor is calibrated based on the in situ test results of 46 anchors with a rigorous theoretical approach which constructs the relationship between the resistance factor and failure probability. With this relationship, the reliability corresponding to the code regulation can be verified. From the results of the analysis, it is found that the borehole enlargement due to the flush drilling is quite significant: the actual diameter of the fixed anchor end may be much larger than the nominal diameter of the drilling casing. Consequently, the safety factor of 3.0, recommended by most anchor codes, is found to be too conservative. The results should be valuable for reliability-based design of flush drilled soil anchors in the Taipei Basin.
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Information
Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 134 • Issue 9 • September 2008
Pages: 1348 - 1363
Copyright
© 2008 ASCE.
History
Received: May 28, 2007
Accepted: Dec 12, 2007
Published online: Sep 1, 2008
Published in print: Sep 2008
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