Ductile connections for pre-formed construction elements

A passive hysteretic damper comprising:

• a U-shaped flexural plate formed of a first material comprising a metal or a metal alloy and having a width between a first edge and a second edge, wherein the U-shaped flexural plate includes a curved portion that extends along a first length of the first edge and a first length of the second edge, a first leg defined by a rectangle that extends across the width and along a second length of the first edge and a second length of the second edge, and a second leg defined by a rectangle that extends across the width and along a third length of the first edge and a third length of the second edge, the first leg extending from a first end of the curved portion, and the second leg extending from a second end of the curved portion, the curved portion joining the first leg to the second leg;
• and
• a reinforcement element formed of a second material comprising a metal or a metal alloy, the reinforcement element having a size and shape so as to be nested within the curved portion, wherein upon this nesting, the reinforcement element defines a circle in a transverse plane that passes through the first leg, the curved portion, and the second leg.