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• W618491978 abstract "This report presents results from a two-year experimental study to evaluate the interface bond between a cast-in-place seal slab and prestressed concrete or steel piles. Both scale model and full-scale tests were conducted and several cofferdam conditions were simulated. These were (1) marine environment, (2) fresh water conditions, and (3) drilling fluid condition. Normal pile surfaces were investigated. Additionally, the situation of soil-caked piles was also investigated. In the model tests, a total of 36 one-third scale specimens were tested - 28 prestressed concrete and 8 steel. Bonded embedment depth in the seal slab was varied between d to 2d where d was the size of the pile. The results of these tests indicated that shear stress variation was non-uniform leading to larger computed bond stresses with shallower embedment. Values were least for drilling fluid. Concrete piles had better bond with the seal concrete than steel piles. Soil-caked condition was found to be relevant for the drilling fluid situation only. In other cases, it was washed away from the pile surface. In the full-scale tests, a total of 32 specimens were tested divided equally between steel and concrete. The prestressed piles were 14 in. square and the steel piles were 14 in. deep wide flange sections. Embedment depth was varied between 0.5d to 2d, i.e., 7 to 28 in., with the larger depth reserved for the drilling fluid condition. Four of the 16 prestressed piles were cast with embedded gages located at the top, middle and bottom of the interface region. The results of the full-scale tests were similar to those from the one-third scale tests. The most important findings were (1) loads were transferred over a distance equal to the depth of the pile, (2) scale effects were present - the average calculated bond stresses were lower for the full-scale tests than from the corresponding scale model tests, (3) prestressed piles cracked prior to bond failure, and (4) the seal slab cracked prior to bond failure. Based on the test results it is proposed that the interface bond between piles and the seal slab be restricted to an effective area in contact with the cast-in-place seal slab. The effective area is calculated using the actual embedment depth or the size of the pile, whichever is smaller. The average bond stress over this region is limited to 300 psi for concrete piles and 150 psi for steel piles. These values are reduced by a third in cases where drilling fluid is used. Application of the proposed values to the conditions related to the full-scale tests led to average factors of safety in excess of two for both the prestressed and steel piles. However, tension loads taken by the piles should not lead to cracking (concrete) or exceed the allowable tension load (steel) of the piles. Nor should the seal slab crack." @default.
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• W618491978 date "2000-06-01" @default.
• W618491978 modified "2023-09-27" @default.
• W618491978 title "SEAL SLAB/PILE INTERFACE BOND" @default.
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