Rigging
Shock Load
Definition
A shock load is a sudden dynamic force, much larger than the static weight, produced when a load is dropped, jerked or caught after a fall. It can multiply the static force several times in an instant and exceed the WLL of a component rated well above the static weight. Safety bonds are kept short for this reason, because a longer fall produces a larger force on arrest.
In the field
A fixture on a slack safety bond produces a violent shock load when it drops and the bond snaps taut, enough to break a bond rated well above the fixture's static weight. Bonds are therefore kept short, and rigging is not subjected to snatch or jerk loads.
Sources
- DGUV Information 215-313 « Lasten über Personen » : charges dynamiques et sécurisation des charges suspendues · publikationen.dguv.de
- PLASA / NRAG, Guidance: load suspension using electric chain hoists over stages and auditoria (janv. 2021) : sécurités secondaires et chute de la charge · plasa.org