Section 02: Terminology - wtcatko.com · Section 02: Terminology 2 ... Span 28 Overall Truss Depth...
Transcript of Section 02: Terminology - wtcatko.com · Section 02: Terminology 2 ... Span 28 Overall Truss Depth...
1Level 1: Section 02 – Version 3© 2014 SBCA
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Section 02: Terminology
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Section Downloads
Download & Print TTT I Sec 02 Slides
TTT I Sec 02 Handouts
Version 2.1
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Terminology Outline
Industry Standards/Publications
Truss Terms
Bracing Terms
Design Terms
Lumber Terms
Miscellaneous Construction Terms
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Industry Standards/ Publications
5
American Softwood Lumber Standard
6
ANSI/TPI 1
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ANSI/TPI 1 Chapter 2
Section 03: Design Responsibilities 8
ANSI/TPI 2
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ASCE 7
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BCSI
11
DSB-89
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International Building Code (IBC)
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International Residential Code (IRC)
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ICC-ES Evaluation Report
Technical Evaluation Report
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Metal Plate Connected Wood Truss Handbook
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National Design Specification for Wood Construction (NDS)
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Quiz 1
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Truss Terms
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Truss
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Metal Connector Plate
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Chase Opening
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Truss Design Drawing
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TrussPlacementDiagram
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Truss Spacing
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Clear Span (Clear Opening)
Different than Span
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Span
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Overall Truss Depth
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Bearing
Usually a Beam or Wall30
Interior Bearing
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Top Chord
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Top Chord Bearing
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Bottom Chord
Typically Carry Combined Tension & Bending Stresses
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Bottom Chord Bearing
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Web Member
Typically Carry Axial Forces36
Panel
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Panel Point
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Peak
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Splice
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Heel Joint
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Butt Cut
¼″
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Heel Height
energy heel
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Cutting Sheets
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Overhang
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Cantilever
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Ladder Panel
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Slider
Reinforcing Member48
Wedge
Determined Through Engineering Analysis
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Soffit
50
Soffit Vents
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Fascia
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Plumb Cut
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Square Cut
90°
54
Nail-On Plate
Used in Repairs
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Scab
Used in Repairs
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Toenail
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Field Splice Piggyback Truss
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Courtesy of Alpine Engineered Products
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Gable End Frame
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Girder Truss
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Ply
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Set Back
GirderSetback
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Hip Roof
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Hip Truss
Step Down Truss
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Hip Girder
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End Jack
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Hip Corner
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Hip Set
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Break Point Joint
AKA: Pitch Break Joint
Purlin Gable Frame
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Courtesy of Alpine Engineering
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Rise / Run
Run
Rise
72
Pitch
12 in.
9 in.
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Valley Set
Usually Require Support
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Jig
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Set-up
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Roller Press
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Hydraulic Press
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Quiz 2
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Bracing Terms
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Diagonal/cross Bracing
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Cross Bridging
Intended to Spread the Load
Intended to stabilize the member82
Lateral Restraint
83
Permanent Bracing – Top chord
Stays in Place for the Life of the Structure
84
Purlin
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Strongbacking
Dampens Vibration & Improves Deflection Performance86
Individual Web Reinforcement
BRACE ON ONE EDGE
TRUSSMEMBER
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Temporary Bracing
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Quiz 3
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Design Terms
Discussed Further in Sections 06 & 0790
Axial Force
compression tension
Usually Measured in pounds, kips, or tons
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Transverse
Includes Radial & Tangential Directions92
Compression/Tension Chords
93
Force Diagram
Also Known as a Free Body Diagram94
Stress
Usually Measured in psi
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Bending Stress
Usually Measured in psi
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Moment
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Compression Parallel-to-Grain
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Compression Perpendicular-to-Grain
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Tension Parallel-to-Grain
100
Shear
Horizontal shear
101
Combined Stress
Index (CSI)
CSITC 0.84BC 0.52WB 0.51
Shall Not Exceed 1.00 or 100%
Stressed
102
Load
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Dead Load
104
Live Load
Image courtesy of TrusJoist, A Weyerhaeuser Business
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Wind Load
Usually Measured in psf
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Reaction
107
Uniform Load
108
Concentrated Load
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Load-Bearing Wall
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Deflection
111
Creep
Deflection / Time
112
CamberThis image cannot currently be displayed.
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Quiz 4
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Lumber Terms
Discussed Further in Section 05
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Softwoods
No Reference to Hardness
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Cambium
117
Heartwood
Sapwood
Courtesy of Wood Engineering and Construction Handbook118
Early Wood
Also Called Spring Wood
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Late Wood
Also Called Summer Wood120
Dense
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Pith
Courtesy of Wood Engineering and Construction Handbook122
Juvenile Wood
Cross section of 14-year-old tree in a high
yield forest
Cross section of 24-year-old tree in an unmanaged forest
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Compression Wood
Compression Wood
Shrinks Excessively Lengthwise
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Fiber Saturation Point
Between 25 to 30%
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Seasoning
126
Lumber
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Board
128
Dimension Lumber
129
Nominal Size
3.5’’
1.5’’2 x 4
5.5’’
1.5’’2 x 6
7.25’’
1.5’’2 x 8
9.25’’
1.5’’2 x 10
11.25’’
1.5’’2 x 12
Selections from ANSI/TPI 1-2002
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Warp
CUP
BOWCROOK
TWIST
131
Defect
132
Decay
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Grade/ Visual Grade
134
Machine Evaluated Lumber (MEL)
135
Machine-Stress Rated Lumber (MSR)
Design Bending Stress Modulus of ElasticityBending Stress = 1650 psi MOE = 1,500,000 psi
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Compound Cut
#1
#2
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Structural Composite Lumber (SCL)
Structural Use138
Plywood
Thin Sheets of Wood Veneer- called Plys
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I-Joists
Used in Floors & Roofs140
Laminated Veneer Lumber (LVL)
Veneer Thickness Does Not Exceed ¼″
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Parallel Strand Lumber (PSL)
Average Length is Min. of 150X Strand Least Dimension
Strand Least Dimension Does Not Exceed ¼″
Laminated/Oriented Strand Lumber
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Quiz 5
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Miscellaneous Construction Terms
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Anchorage
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Beam Pocket
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Bird’s Mouth Cut
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Built-Up Beam
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Built-Up Roof
1
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5
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CAD
Courtesy of MiTek Industries, Inc.
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Clinched Nail
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Construction Design Documents
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Conventional Framing Ribbon
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Rim Joist
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Scupper
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Quiz 6
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