During fabrication of prestressed concrete bridge girders, the strands are pretensioned in the precasting bed prior to casting the concrete. Because the beds are fixed length, changes in temperature affect the mechanical stress in the strands. Currently, the strand stress is adjusted during tensioning to account for the difference in temperature between strand pull and the temperature of the concrete at placement. It is believed that temperatures may increase to the hydration temperature (e.g., 160 degrees Fahrenheit) prior to bonding. The implication is that the strand may undergo larger losses in prestress prior to bonding that currently are not accounted for in design.
Agreed11 months ago
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