a post anchoring support device comprising a ground anchor having a shaft with a threaded upper portion terminating in an upper end that may be engaged and rotated by a drive tool for rotating the shaft about a vertical axis , and a lower portion for insertion into the ground , and a post receiving bracket having base with a vertically oriented internally threaded portion adapted to receive the externally threaded portion of the shaft , a support portion defining a support surface for abutting the end of the post , vertical planar walls extending above the support surface , each planar wall having an inside surface for abutting a side of the post , and each planar wall defining a plurality of vertically oriented elongate holes and having a raised portion on the outside surface adjacent each elongate hole adapted to abut a lower surface of a head of a fastener passing through the elongate hole and into the post to allow the fastener to travel within the elongate hole upon the application of a vertically force to the post anchoring support device sufficient to overcome a coefficient of friction between the head of the fastener and the raised portion .