Abstract:
This research will validate the long term performance of CLT and veneer based (LVL and MPP) post-tensioned (PT) rocking shear walls, compare alternative mass timber shear wall materials, and communicate the design process and recommendations to the architecture, engineering, and construction industries.
 
Project duration:
2019-2021
 
Funding:
Agricultural Research Services (ARS)
 
Research Team:
Mariapaola Riggio, Andre Barbosa, Leck Muszynski
 
Background:
Currently there are no mass timber lateral force resisting systems (LFRS) that are prequalified through design code for use without testing, resulting in many mass timber designs relying on reinforced concrete and/or steel systems for later force resistance. Post-tensioned CLT shear walls are an innovative and promising solution for resilient seismic timber design, but there is a lack of understanding of the short and long-term behavior of these systems once installed particularly in terms of creep, deflections, and tension loss.
 
Project Overview:
Empirical Tests - Small scale (<8 foot height), axially loaded post-tensioned CLT and MPP shear walls will be subjected to various, highly controlled climatic conditions to evaluate and correlate climate, mechano-sorptive creep and tension loss over time. A second round of experiments will analyze large CLT and MPP panels in the Emmerson Laboratory, where the contributions of known compression loading will be evaluated under controlled but typical conditions.
 
Full Scale - Small and large-scale test data will be validated against data collected from two full scale PT rocking wall monitoring projects, Oregon State University's Georgy W. Peavy Forest Science Center in Corvallis, Oregon and University of Cantebury's NMIT Arts and Media Building in Christchurch New Zealand.