Structural Systems Summary
Gravity System - Wood
Design for the building's structural gravity system is a mass timber post and panel configuration. Cross-laminated timber panels are supported by glulam timber columns. CLT Panels are 5.5" thick 139VE with a 2" thick gypcrete topping slab. Foundation system consists of 5" thick slab on grade with 24" deep spread footings at columns. At brace frames 24” deep strip footings with a 18” X 18” central grade beam and rock anchors at ends of brace frames are utilized.
Lateral System - Steel
Design for the building's structural lateral system is a steel brace frame system, utilizing steel columns and diagonal braces. Concentric HSS 6" x 6" x 1/2" diagonal braces frame to 10" x 10" x 1/2" HSS columns. The California Building Code currently requires mass timber structures to have a steel or concrete lateral system. The hybrid structural system of wood and steel as utilized by this case study is currently one of the most common approaches to building in mass timber in California.
