To achieve the objective, first, a post-tensioning anchorage system is equipped with arrays of ESGs (electrical strain gages) for measuring strain responses. The anchorage system is installed on the stressing system, which is used to resist prestress force from the anchorage. Second, strain responses of ESGs arrays are measured under series prestress loss cases. Third, strain variations are utilized to determine stress components sensitive to prestress force loss. Last, empirical equations for prestress loss estimation is proposed based on experimental strain data. |
