Wk 5 First Principles

Question 1

Posts

Answer 1

Vertical structural members

Question 2

Beams

Answer 2

Spanning/horizontal structural members

Question 3

Buckling

Answer 3

• occurs when compression overcomes an object’s ability to endure that force
• thick posts resist buckling

Question 4

Bending

Answer 4

• Tension on bottom compression on top => BENDING under excessive load
• deep beams resist bending

Question 5

Lateral load resisting systems

Answer 5

Rigid joints
Cross bracing
Embed posts in ground

Question 6

Rigid Joints

Answer 6

Rigid joints resist racking

Question 7

Define RACKING

Answer 7

Racking is the term used for when buildings tilt as their structural components are forced out of plumb.

Question 8

define LIVE LOADS

Answer 8

those loads that are not permanent

Question 9

define DEAD LOADS

Answer 9

the weight of the materials that make up the table

Question 10

define COMPRESSION

Answer 10

compression describes the condition within a member subject to compaction or a squashing force

Question 11

define TENSION

Answer 11

tension describes the condition within a member subject to a stretching or elongating force

Question 12

What causes snapping to occur?

Answer 12

when tension surpasses an object’s ability to endure the lengthening force.

Question 13

define SPANNING

Answer 13

the distance b etween supports in a structure

Question 14

define VERTICAL loads

Answer 14

downward loads (gravity, weight of materials)

Question 15

define LATERAL loads

Answer 15

sidewards loads (wind, vehicle collisions)

Question 16

define STRUCTURAL LAYOUT

Answer 16

the position of members carrying the loads of a structure, represented in plane, section or 3d

Question 17

define LOAD PATHS

Answer 17

Load paths represent the paths that loads pass through the structure to the supporting foundation

Question 18

Name 2 typical modes of structural failure

Answer 18

Buckling & bending

Question 19

define POST & BEAM FRAMING

Answer 19

a structural framing system in which beams rest on posts rather than bearing walls

Question 20

define BRACING

Answer 20

cross bracing, shear walls, rigid joints used to stabilise a structure against lateral forces

Question 21

define CANTILEVER and BACKSPAN

Answer 21

rigid structural member unsupported at one end (centilever) supported in 2 or more places at the other end (back span)

Question 22

what is the general rule of thumb for size of cantilever relative to backspan?

Answer 22

Backspan => 3xcantilever

3/4 backspan: 1/4 cantilever

Question 23

define LIGHT TIMBER FRAMING

Answer 23

a structural framing system made up of closely spaced relatively small sectioned members