|1-2 pre-uplift, “fixed-base” response as the
gravitational restoring force is overcome
|2-3 pier leg begins to uplift and pull brace
until the brace yields at pt. 3.
| post-uplift stiffness defined by
rocking stiffness, kr, which includes flexibility of the tower and rotational
flexibility at the base
|3-4 unbonded brace yields in tension to the
maximum pier displacement at 4.
|4-5 pier begins to move in opposite direction,
tensile force in the unbonded brace is released and begins to go into
compression until it begins
compressive yielding at pt. 5.
|5-6 unbonded brace goes through compressive
yielding until coming back into contact with the foundation at pt. 6.
|6-1 pier deformations are returned to the
|6-7 After the brace goes through