Abstract: A system for earthquake retrofit of existing building structures uses a knee brace connected on one end to an existing stud and to an existing floor joist on the other end. An additional stud is provided for reinforcement to prevent the existing stud from failing. The capacity of all other components of the system exceed the capacity of the connections between the knee brace and the existing stud and existing floor joist, which connections act as a fuse in the event of an earthquake and fail first, thus preventing failure of other components and improving collapse capacity of the building structure.

Abstract: A resilient C shaped connector ring is described which can be snapped onto a BNC type coaxial connector plug. The connector ring includes a pair of short protrusions that prevent the outer shell of the modified BNC type coaxial connector plug from rotating. Also included is a pair of long protrusions that provide a gripping action when the modified BNC type coaxial connector plug is installed.