Experimental seismic post-tensioning performance and long-term effects of a post-tensioned timber framed model with dissipative systems

In recent years, post-tensioned timber framed buildings, recognized as one of the most effective sustainable and anti-seismic solutions, are developing throughout the world. Posttensioning (PT) loss in timber framed buildings with post-tensioned beam to column joints is a crucial aspect which governs the moment capacity of the connection and the global seismic performance of the frame. This paper investigates on the variations of the post-tensioning force of a 2/3 scaled, threestorey, post-tensioned timber frame experimental model investigated in three different configurations: bare frame; with dissipative rocking mechanism; with dissipative bracing system. The variation of post-tensioning during shaking table testing a set of seven spectracompatible earthquakes at increasing PGA levels has been evaluated and the long-term losses over about four years have been investigated.