EXPERIMENTAL SEISMIC POST-TENSIONING PERFORMANCE AND LONG-TERM EFFECTS OF A POST-TENSIONED TIMBER FRAMED MODEL WITH DISSIPATIVE SYSTEMS A. Di Cesare 1 , F. C. Ponzo 1 , N. Lamarucciola 1 and D. Nigro 1 1 School of Engineering, University of Basilicata Viale dell'Ateneo Lucano, 10 - 85100 Potenza {antonio.dicesare, felice.ponzo, nicla.lamarucciola, domenico.nigro}@unibas.it Abstract In recent years, post-tensioned timber framed buildings, recognized as one of the most effec- tive sustainable and anti-seismic solutions, are developing throughout the world. Post- tensioning (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, three- storey, post-tensioned timber frame experimental model investigated in three different config- urations: bare frame; with dissipative rocking mechanism; with dissipative bracing system. The variation of post-tensioning during shaking table testing a set of seven spectra- compatible earthquakes at increasing PGA levels has been evaluated and the long-term losses over about four years have been investigated. Keywords: Post-tensioned timber framed buildings, Energy dissipation systems, Shaking ta- ble tests, Post-tensioning variation. 3982 COMPDYN 2021 8 th ECCOMAS Thematic Conference on Computational Methods in Structural Dynamics and Earthquake Engineering M. Papadrakakis, M. Fragiadakis (eds.) Streamed from Athens, Greece, 28 - 30 June 2021 Available online at www.eccomasproceedia.org Eccomas Proceedia COMPDYN (2021) 3982-3991 ISSN:2623-3347 © 2021 The Authors. Published by Eccomas Proceedia. Peer-review under responsibility of the organizing committee of COMPDYN 2021. doi: 10.7712/120121.8761.18994