11/22/2017
Components of Steel Structures Purpose
Bar Joists
-Supports floors and roofs -Typically designed as a simple span member
Superstructures
Pre Cast Planks Continuous interior voids add: -Structural stability -Reduce weight -Reduce Cost
-Usually Pre stressed -Typically used for floor or roof decking -Capable of spanning long open spaces (aid design flexibility) -Truss system that is staggered within the facility -Fewer columns -Faster fabrication and erection schedules -Reduced foundation costs -Designed to interlock with concrete slabs -Permanent form and positive reinforcement for concrete
Cast In Place Concrete
Wood Frames
Structural Steel
Pre Cast Concrete
Pre Engineered
Staggered Truss -In areas of low seismic hazard -For Buildings 6 – 20 stories tall
Composite Deck -Strong, Lightweight and economical
Pre Cast Concrete (1)
Wood Stack Framing (1)
• Advantages of Pre cast compared to Cast-in-Place ▫ Higher quality control ▫ Speed of erection ▫ Freedom in the architectural shape of the members • Typical utility of pre cast concrete ▫ Retaining walls ▫ Foundations ▫ Floor systems ▫ Storm water detention vaults ▫ Sound walls/barriers
• Floor deck of the structure sits on top of the walls • Floor system consists of:
▫ Wood Joists ▫ Floor Trusses ▫ TJI®
Silent Floor Trus Joists (brand name)
Wood Balloon Framing (2)
Pre Cast Concrete (2)
• Concrete Masonry Unit (CMU) • Very common building material for load bearing walls • Concrete Block Structure (CBS) • Advantages of CMU Structures ▫ Durable
• Long continuous framing members with intermediate floor structures nailed to them • The heights of window sills, headers and next floor height marked out on the studs with a storey pole
▫ Self Contained ▫ Fire Resistant ▫ Low Maintenance
• Disadvantages ▫ Labor Intensive Construction ▫ Water Penetration ▫ Difficult to Insulate ▫ Nominal modular dimensions
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