Abstract
Longitudinal stress wave propagation due to the cutting of an unbonded prestressing tendon during demolition has been studied using the finite element method. The grease layer surrounding the tendon provides a substantial viscous damping, which was represented by a linear Maxwell model with a cut-off at a limiting value of damping force. The model was validated, and damping parameters determined, by comparison with laboratory test results for tendons up to 7.4 m in length. The model was then extended to examine the behaviour of tendons longer than those tested in the laboratory. The effect of energy absorption at mortared-in end anchorages was also included. It was found that tendon displacements were small for all the lengths and tendon diameters considered.
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