|
| |
| |
|
The document below has a numbered blue "comment dot" (  ) following selected items. Click a blue dot to add your comment regarding that item. A glasses icon ( ) indicates existing comments on an item; click it to see them. Click the buttons above to navigate between views.You can add a general comment here: Add a general comment
Show comments in-line | ||||||||||||||||||||||||||||||||
DESCRIPTION 1
Identify and
describe the various loads that effect timber framed structures and the causes
of these loads. 2
Identify and
describe the various load conditions of timber posts and beams. 3
Identify and
describe how and why timber framed structures fail. 4
|
LEARNING
TASKS |
|
CONTENT |
|
1. Loads that effect timber structures and
their causes |
|
Live Loads (Occupants,
Machinery, Vehicles, Snow, Wind, Rain, Earthquakes)
Dead Loads (Materials,
Fixtures & Fittings)
Wind Loads
Earthquakes
Hurricanes
Resultant Loads
Other factors (Impact,
Fatigue, Fire, Decay, Etc)
Harmonic Loads |
|
2. Loads in posts and beams |
|
Uniform Load / Distributed
Load
Point Load
Bending & Deflection
Cantilevered Load (Including
1:2 Rule of Thumb)
Effects of Green Timber &
Shrinkage
Braces in Tension &
Compression (Knee Braces vs. Full-length Struts) |
|
3. Causes of structural frame failure |
|
Fire
Earthquakes
Hurricanes
Building Alterations
Insect Attack & Decay
Maintenance Issues
Harmonics
Poor Design Choices (Hammer
Beams, Etc) |
Theory:32
i)
Given a multiple choice test of
30 recall/recognition type questions about the mechanical properties of timber
frames, the learner will answer all questions within 30 minutes and score a
minimum of 70%, or 21 correct answers. 33
ii)
Given a complete set of
drawings for a simple (3-4 bay) timber framed building, learners will identify
the various types of loads that are likely to effect the design of the frame. 34
iii)
Given clear illustrations or
photos of various common timber components, learners will correctly identify
the following: 35
a)
Whether timbers are acting in
tension, compression, or a combination of tension and compression 36
b)
Whether the timbers are subject
to point loads or distributed loads 37
c)
In which direction timbers are
likely to deflect 38
d)
Whether the timbers are
cantilevered or simply-supported 39
DESCRIPTION 41
Identify and describe the various forces
and stresses that act upon a timber framed building and its individual timber
components. 42
Identify tension joinery. 43
|
LEARNING
TASKS |
|
CONTENT |
|
1. Identify forces and stresses |
|
Compression Parallel to Grain
Compression Perpendicular to
Grain
Tension Parallel to Grain
Tension Perpendicular to
Grain
Vertical Shear
Horizontal Shear
Bending & Deflection
Rotation
Neutral Axis of Timbers
Shear Planes
Load Path
Load Diagrams
Reaction Forces |
Theory:60
i)
Given a multiple choice test of
30 recall/recognition type questions about the forces and stresses that effect
timber frames, the learner will answer all questions within 30 minutes and
score a minimum of 70%, or 21 correct answers. 61
ii)
Given a complete set of frame
drawings for a simple (2-3 bay) timber framed building, learners will correctly
identify all locations of tension joinery. 62
iii)
Given clear line-drawings of
various simple, common truss and frame types showing common load conditions,
learners will correctly identify the following: 63
a)
Load paths 64
b)
Which timbers are acting in
compression, tension or a combination of tension and compression 65
DESCRIPTION 66
Identify and
describe the parts and properties of hardwood and softwood. 67
Describe the various
types of shrinkage that effect timbers. 68
Describe the effects
of timber shrinkage on timber shapes and dimensions. 69
Identify and
describe the processes of rot, decay and insect attack in timber. 70
|
LEARNING
TASKS |
|
CONTENT |
|
1. Parts and properties of trees and
timbers |
|
Softwood & Hardwood
Photosynthesis
Cell Structure
Fibres & Vessels
Chemical Content (Lignin,
Cellulose, Hemicellulose, Ash & Extractives)
Annual Rings
Sapwood & Heartwood
Spring Wood & Summer Wood
Juvenile Wood
Terminology (Pith, Juvenile
Wood, Xylem, Rays, Cambium, Phloem & Outer Bark, Etc)
Thermal Properties
Strength Properties
Hygroscopicity
Acoustical Properties
Resistance to Rot & Decay |
|
2. Effects of shrinkage |
|
Radial Shrinkage
Tangential Shrinkage
Longitudinal Shrinkage
Shrinkage Values &
Reference Tables
Free Water & Bound Water
Moisture Content (MC) &
Specific Gravity
Fibre Saturation Point (FSP)
Equilibrium Moisture Content
(EMC)
Timber Sections & Cuts
of Timber
Checking
Drying & Seasoning |
|
3. Rot, decay and insect attack |
|
Structural Polymers (Starch
& Sugars)
Moisture & Nitrogen |