The Structural Redesign Of The Liuna Expansion Building Utilzing Cross-laminated Timber And Engineered Wood Products And Associated Precedent Studies, Fire Protection Design, And Constructability Analysis

Open Access
Jaskowiak, Joshua Michael
Area of Honors:
Architectural Engineering
Bachelor of Architectural Engineering
Document Type:
Thesis Supervisors:
  • M Kevin Parfitt, Thesis Supervisor
  • Richard George Mistrick, Honors Advisor
  • Structural Timber Construction
  • Wood
  • CLT
  • Moment Frames
  • Connection Design
  • Fire Protection
  • Constructability
  • Sketch Up
ABSTRACT The LiUNA Headquarters Expansion features a rectangular structural grid on a 5,300 SF floor plan and 9 occupied stories. For the purposes of this thesis, the expansion structure was considered as a stand-alone structure. The structural re-design investigated changing the structural framing system to heavy timber with glulam beams and columns with CLT floor deck as the primary structural components. The original floor plan was changed to reduce structural depth to an acceptable limit and reduce bay sizes more typical of those found in timber construction. In order to preserve the original architectural intent of an open floor plan and unrestricted views through both the North and South curtainwall, a lateral force resisting system of wood moment frames were designed using bolted moment connections and A36 steel plates. Since heavy timber structural design is not a traditional focus of structural engineering, the additional views, drawings, and images were created using a 3D model in Sketch Up to help those unfamiliar with timber engineering to quickly understand the proposed structural system. The mechanical breath focuses on fire protection systems for timber. A dual-part solution is presented that includes passive protection via the charring and encapsulation methods and both mechanical protection via wet sprinkler systems. The construction management breath identifies key tasks in the timber erecting process, required skills, means, and methods, and potential cross-over points in the steel and prefabricated construction processes. These crossover points would allow tradespersons from alternative industries to learn the timber erection process quickly while allowing for quick growth of the industry in new markets.