Timeline: 2019-2021
Project Lead: Mariapaola Riggio
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.
 
 
Timeline: 2019-2021
Project Team: Andre Barbosa, Arijit Sinha
Abstract: In order to facilitate adoption of new mass timber products into practice, physical testing is required to understand and predict structural behavior. While extensive testing has been conducted at Oregon State on basic engineering properties of mass plywood panels (MPP) and MPP-to-MPP connections, there exists no experimental data on connections between MPP and other timber members (e.g. glulam) or on composite behavior of MPP with a concrete topping. Previous testing on CLT concrete-composite systems looked at different CLT-to-concrete connection systems, with HBV shear connectors-steel plates partially embedded in the timber with epoxy resin- as a strong candidate in terms of strength and stiffness performance. This project will focus on exploring the performance of MPP-concrete composite systems with HBV connectors.
 
 
Timeline: 2019-2022
Project Lead: Arijit Sinha
Abstract: The results of this proposal will provide guidance on efficient design and analysis strategies for wood building construction including rocking/post-tensioned and pivoting spines, a next-generation seismic force resisting system, for improved performance, safety, sustainability, and economy. 
 
 
Timeline: 2019-2021
Project Team: Fred Kamke, Arijit Sinha
Abstract: This project aims to achieve two primary tasks: (1) to fill in the gaps in terms of mechanical performance of MPP, and then to create a performance, design, and application guidline for industry, and (2) to characterie the hygrothermal performance of MPP and correlate climatice conditions to bond performance, mechanical performance, and manufacturing standards.
 
 
Timeline: 2017-2020
Project Lead: Mariapaola Riggio
Abstract: Building on the results of an earlier project that established protocols for post-occupancy building monitoring, this project aims to install a system in the new Peavy Hall building at Oregon State University to monitor moisture, relative humidity, vertical and slip movements due to shrinkage and deflection, post-tensioning losses, vibration and seismic activity. The monitoring system will establish a "living" laboratory that demonstrates in real time how the mass timber components of the building are affected by various internal and external phenomena. The data will be gathered and analyzed over the service life of the building.
 
 
Timeline: 2017-2019
Project Lead: Armin Stuedlein
Abstract: Liquefaction caused damage to 25,000 homes in the 2011 Tohoku earthquake in Japan and $15 billion in losses in Christchurch in 2010-11. This project will propose design guidelines for the use of timber piles, a timber product widely-used for structural support of buildings, to mitigate against liquefaction hazards. This approach has application in protecting a broad range of other structures, including port and harbor facilities, bridge approach embankments, and bridge foundations. While significant field-based experimental research has been conducted by the PIs to-date, there does not exist a set of design guidelines to handle both the densification and reinforcement effect. The results of this research will be used by engineers who need to follow specific design guidelines to ensure that an appropriate liquefaction mitigation design can be provided. 
 
 
Timeline: 2017-2020
Project Lead: Andre Barbosa
Abstract: This project develops benchmark data needed to generate design guidelines for structural engineers to calculate strength & stiffness of CLT-diaphragms, with and without concrete toppings. The project includes a full-scale test of a two-story mass timber building at the UC San Diego shake table in collaboration with the larger project, “Development and Validation of a Resilience-based Seismic Design Methodology for Tall Wood Buildings” which features collaborators from throughout the western US and is funded by the Natural Hazards Engineering Research Infrastructure (NHERI) program of the National Science Foundation. 
 
 
Timeline: 2016-2019
Project Lead: Arijit Sinha
Abstract: MPP, like CLT, can be used as a substitute for traditional building materials, providing much lower embodied energy and greater carbon sequestering properties than concrete and steel. Freres Lumber Company in Lyons, Oregon says that some advantages of MPP are that it uses 20-30 percent less wood than CLT. Large-format panels can be manufactured at the production facility in order to minimize waste and labor on job sites. The light weight of the panels can help save on transportation costs and logistics during construction
 
 
Timeline: 2016-2019
Project Lead: Thomas Miller
Abstract: Understanding how roof and floor systems (commonly called diaphragms by structural engineers) that are built from Pacific Northwest-sourced cross-laminated timber (CLT) panels perform in earthquake-prone areas is a critically needed area of research. These building components are key to transferring lateral forces from wind and earthquakes into the shear walls and down to the foundation. The tests performed in this project will provide data on a commonly used approach to connecting CLT panels within a floor or roof and the performance of the overall system and the screw fasteners. Structural engineers will directly benefit through improved design guidance. A broader benefit will be increased confidence in the construction of taller wood buildings in communities at greater risk for earthquakes.
 
 
Timeline: 2016-2019
Project Lead: Arijit Sinha
Abstract: Constructing buildings with cross-laminated timber (CLT) requires development of novel panel attachment methods and mechanisms. Architects and engineers need to know the engineering strength properties of connected panels, especially in an earthquake-prone area. This project will improve knowledge of three types of wall panel connections: wall-to-floor, wall-to-wall, and wall-to- foundation. A common method of joining panels is to use metal-plate-connectors with screw fasteners. Testing will determine the strength properties of metal connectors applied with different types and sizes of screw fasteners. A novel fastening system will be developed. The strength and stiffness parameters established will be validated using full-scale shear wall tests. The data will be used to develop a modeling tool that engineers can use when designing multi-story buildings to be constructed with CLT panels.
 
 
Timeline: 2016-2019
Project Lead: Mariapaola Riggio
Abstract: TDI researchers measured a wide range of performance indicators of CLT, both within a controlled laboratory setting and within occupied buildings outfitted with sensors. The goals were to generate monitoring protocols, acquire benchmark data about the holistic performance of CLT buildings (which will ultimately help define performance standards for CLT systems) and to explore how monitoring might reduce market barriers for CLT.