noun
live load; liveload
Engineering term for a temporary, movable load on a structure, such as vehicles on a bridge, as opposed to the structure's own weight (dead load).
橋の設計では、活荷重として車両の重さを考慮する必要がある。
In bridge design, the weight of vehicles must be considered as a live load.
Compound of 活 (active, live) and 荷重 (load). A technical term likely coined in modern engineering contexts.