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Title: Static, sustained, and cyclic load tests of steel pile connectors, New Orleans District
Authors: United States. Army. Corps of Engineers. New Orleans District.
O'Neil, Edward F.
Keywords: Connectors
Load tests
Pile caps
Repetitive loads
Static loads
Sustained loads
Timber piles
Publisher: Concrete Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Miscellaneous paper (U.S. Army Engineer Waterways Experiment Station) ; C-74-13.
Description: Miscellaneous paper
Abstract: Fourteen pile cap specimens, each containing two, three, or four TECO TENCON connectors nailed to a section of saturated, class "B" timber piling and encased in a concrete pile cap, were subjected to three types of tests conducted under submerged conditions to evaluate the effectiveness of the connectors. The specimens were tested under: (a) static tensile loads to failure to determine the ultimate load that two connectors could withstand, (b) sustained tensile loads at various percentages of the corresponding ultimate loads to determine the effects of percentage of load and duration of load on the slip characteristics of the pile connectors, (c) cyclic loading from tension to compression to determine what effect repetitive loads would have on the amount of slip between the pile and the cap. The test results indicated that the specimens ultimately pulled from the pile cap at loads between 50 and 68 kips, and the most prevalent mode of failure was failure of the steel connectors due to straightening when pulled from the concrete cap. The most critical mode of failure, however, was the failure of the timber pile due to the destruction of the wood fibers. This mode of failure occurred in the specimens at an average load of 51.67 kips per two connectors. The sustained loading tests showed that, at lower sustained loads, the slip was linear and dependent upon the duration of the loading. At higher percentages of ultimate load, the slip was also dependent upon duration of load but did not always remain linear with increased duration of time. Cyclic loading, in general, produced linear loading curves and nonlinear rebound curves. The compressive cycles of loading indicated that the connectors did not bear the force of the load, but that the butt of the pile bearing on the concrete above the pile distributed the force to the concrete. With each successive cycle of loading, the total creased over that of the previous cycle.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Miscellaneous Paper

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