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MODULE 6. STRUCTURAL FRAMING INSPECTION I. Building Subsystems. structural framing & foundations enclosure systems plumbing lighting acoustics safety systems electric power & signal systems HVAC. Transfer of forces acting on the building.

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building subsystems
Building Subsystems
  • structural framing & foundations
  • enclosure systems
  • plumbing
  • lighting
  • acoustics
  • safety systems
  • electric power & signal systems
  • HVAC
transfer of forces acting on the building
Transfer of forces acting on the building
  • foundation systems are designed to transmit loads from the structural system directly to the ground
    • settlement of the completed building must be within acceptable limits
  • structural systems should be designed to transfer its loads to the foundation
    • its design must be anticipated in the foundation design
transfer of forces acting on the building1
Transfer of forces acting on the building
  • most building structural systems consists of
    • floors
    • roof decks
    • horizontal members that support the floor and or roof
    • vertical members that support other components
  • floor and roof decks or beams that support them, are usually on load bearing walls or columns which carry the load downward
  • structural systems must be designed to transmit vertical and horizontal loads to the foundations
transfer of forces acting on the building2
Transfer of forces acting on the building
  • vertical walls and columns carry vertical loads downward but
    • acting alone they are inadequate to resist lateral forces
  • to help counteract lateral forces
    • bracing can be implemented into the system
    • beams can be connected to columns to produce a rigid frame to resist lateral movement
    • long walls known as shear walls, in two perpendicular directions act like vertical beams in transmitting forces to foundations
  • the strength of the metal connector plates ( gang plates, truss plates) depends on the
    • grip of the teeth
    • shear and tensile capacity of the steel plates
  • identical truss plates are placed directly opposite each other on opposite faces
  • when a truss is axially loaded, the wood fibers press against the teeth and they transfer the load throughout the remaining un-perforated sections of the plate
  • permanent bracing of a roof truss system is done in the field and must comply with the approved drawings
principles of wood construction
Principles of wood construction
  • when in tension, wood is strongest parallel to the grain
  • if the cross-sectional area of a wood member is reduced by holes
    • the net area is reduced
    • the stress-concentrating effect must be considered when figuring out allowable loads
  • under constant loads, wood deflection will increase slightly with time
principles of wood construction1
Principles of wood construction
  • wood is very strong when
    • shear is perpendicular to the grain
  • wood is not as strong when
    • shear is parallel to the grain
  • wood is graded by
    • species (type of wood)
    • grade (#1, #2, #3, stud grade)
    • grade-marking agency
    • moisture content
principles of wood construction2
Principles of wood construction
  • wood is a natural insulator
    • 1 ¼” = RSI 0.22 (R 1.25) batt insulation for 1 ¼” has R 3.25
  • wood can be fire rated by being pressure treated with fire-retardant elements
  • wood that is pressure treated for fire or preservative effects do not loose significant strength
  • Perform exercise #1, questions 1 to 23
  • Q 22
  • Summarize the general rules governing stud posts built into walls.
  • Q23
  • What general rules govern floor framing supported on flat insulating concrete form walls?