|
Abstract The erosion situation，erosion rate and mechanical behavior rules of steel strands in anchors with time have been analyzed and studied through taking erosion tests in strong erosion condition on four types of anchors as steel strand and injection cavity defect anchor with or without prestressing separately. The mechanical behavior reduction of steel strands in anchors and the mechanical behavior reduction differences among various types of samples have been analyzed as well. The regression analysis of the variation of the fracture load of erosion anchor samples with time is conducted. The study results show that in the same erosion condition，the erosion rate of anchors with injection cavity defects(or with broken PE casings or bellows) is faster than steel strand，of course much faster than anchors without defects. Stress erosion has great effect on the mechanical behavior of steel strands in anchors. Based on various tests of the fracture load of steel strands in anchors with erosion time in different erosion conditions，the fracture load can be inferred in a certain erosion condition through the regression curves of relationship between fracture load and time for steel strands in anchors. Therefore，the safety assessment and life prediction to anchors can be carried out.
|
|
Received: 23 April 2010
|
|
|
|
2010, Vol. 29 
