Cross-Laminated Timber Fasteners Solutions for Tall Wood Buildings

Project Lead: Arijit Sinha

Project duration: 3/1/16 – 12/31/19 (NCE)

 

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.

 

Objectives:

  • Evaluate the performance of commercially available fastening systems for CLT panels loaded

    laterally, such as self-tapping screws and brackets.

  • Calibrate the 10-parameter kinematic model for CLT connections involving all tested connection

    systems. The 10-parameter model characterizes the hysteresis curve for the connection as it is cyclically loaded. This provides measures of the strength (ultimate failure load), stiffness (resistance to load) and ductility (beneficial effects of energy required for failure, including reduced loads allowed for design). Additionally, ASCE 41 trilinear models parameters will be generated.

  • Design and develop a novel connection system for energy dissipation for CLT shear walls using the slip friction elements.

  • Develop robust numerical models that predict lateral performance of a CLT panel connection system to be used by engineers, architects and code officials.