Compression strut for suspended ceiling

A spring loaded compression strut adapted for mounting between the members of a suspended ceiling grid system and an overhead structural framework. The strut presses downwardly on the grid system so that the latter resists sudden upward movement as might be caused during an earthquake with the corresponding results that the integrity of the ceiling panel system is more adequately protected during such an event since the supporting grid members therefore are not subject to sudden, relative disorientation. The strut includes clip means at its upper and lower ends adapted for respective connection to the overhead structural framework and the grid members which enables the strut to be readily assembled with existing suspended ceiling systems since it is mounted in an external manner with respect to hanger wires found in such existing ceiling systems.