Wk 5 First Principles Flashcards
Posts
Vertical structural members
Beams
Spanning/horizontal structural members
Buckling
- occurs when compression overcomes an object’s ability to endure that force
- thick posts resist buckling
Bending
- Tension on bottom compression on top => BENDING under excessive load
- deep beams resist bending
Lateral load resisting systems
Rigid joints
Cross bracing
Embed posts in ground
Rigid Joints
Rigid joints resist racking
Define RACKING
Racking is the term used for when buildings tilt as their structural components are forced out of plumb.
define LIVE LOADS
those loads that are not permanent
define DEAD LOADS
the weight of the materials that make up the table
define COMPRESSION
compression describes the condition within a member subject to compaction or a squashing force
define TENSION
tension describes the condition within a member subject to a stretching or elongating force
What causes snapping to occur?
when tension surpasses an object’s ability to endure the lengthening force.
define SPANNING
the distance b etween supports in a structure
define VERTICAL loads
downward loads (gravity, weight of materials)
define LATERAL loads
sidewards loads (wind, vehicle collisions)
define STRUCTURAL LAYOUT
the position of members carrying the loads of a structure, represented in plane, section or 3d
define LOAD PATHS
Load paths represent the paths that loads pass through the structure to the supporting foundation
Name 2 typical modes of structural failure
Buckling & bending
define POST & BEAM FRAMING
a structural framing system in which beams rest on posts rather than bearing walls
define BRACING
cross bracing, shear walls, rigid joints used to stabilise a structure against lateral forces
define CANTILEVER and BACKSPAN
rigid structural member unsupported at one end (centilever) supported in 2 or more places at the other end (back span)
what is the general rule of thumb for size of cantilever relative to backspan?
Backspan => 3xcantilever
3/4 backspan: 1/4 cantilever
define LIGHT TIMBER FRAMING
a structural framing system made up of closely spaced relatively small sectioned members
