Section Downloads Download & Print TTT I Sec 02 Slides TTT I Sec 02 Handouts Version 2.1 Section 02: Terminology 1 2 Terminology Outline Industry Standards/Publications Truss Terms Bracing Terms Design Terms Lumber Terms Miscellaneous Construction Terms Industry Standards/ Publications 3 4 American Softwood Lumber Standard ANSI/TPI 1 5 6 1
ANSI/TPI 1 Chapter 2 ANSI/TPI 2 Section 03: Design Responsibilities 7 8 ASCE 7 BCSI 9 10 DSB-89 International Building Code (IBC) 11 12 2
International Residential Code (IRC) ICC-ES Evaluation Report 13 14 Technical Evaluation Report Metal Plate Connected Wood Truss Handbook 15 16 National Design Specification for Wood Construction (NDS) Quiz 1 17 18 3
Truss Truss Terms 19 20 Metal Connector Plate Chase Opening 21 22 Truss Design Drawing Truss Placement Diagram 23 24 4
Truss Spacing Clear Span (Clear Opening) 25 Different than Span 26 Span Overall Truss Depth 27 28 Bearing Interior Bearing Usually a Beam or Wall 29 30 5
Top Chord Top Chord Bearing 31 32 Bottom Chord Bottom Chord Bearing Typically Carry Combined Tension & Bending Stresses 33 34 Web Member Panel Typically Carry Axial Forces 35 36 6
Panel Point Peak 37 38 Splice Heel Joint 39 40 Butt Cut Heel Height energy heel ¼ 41 42 7
Cutting Sheets Overhang 43 44 Cantilever Ladder Panel 45 46 Slider Wedge Reinforcing Member 47 Determined Through Engineering Analysis 48 8
Soffit Soffit Vents 49 50 Fascia Plumb Cut 51 52 Square Cut Nail-On Plate 90 Used in Repairs 53 54 9
Scab Toenail Used in Repairs 55 56 Field Splice Piggyback Truss Courtesy of Alpine Engineered Products 57 58 Gable End Frame Girder Truss 59 60 10
Ply Set Back Girder Setback 61 62 Hip Roof Hip Truss Step Down Truss 63 64 Hip Girder End Jack 65 66 11
Hip Corner Hip Set 67 68 Break Point Joint Purlin Gable Frame AKA: Pitch Break Joint Courtesy of Alpine Engineering 69 70 Rise / Run Pitch Run Rise 9 in. 12 in. 71 72 12
Valley Set Jig Usually Require Support 73 74 Set-up Roller Press 75 76 Hydraulic Press Quiz 2 77 78 13
Diagonal/cross Bracing Bracing Terms 79 80 Cross Bridging Lateral Restraint Intended to Spread the Load Intended to stabilize the member 81 82 Permanent Bracing Top chord Purlin Stays in Place for the Life of the Structure 83 84 14
Strongbacking Individual Web Reinforcement BRACE ON ONE EDGE TRUSS MEMBER Dampens Vibration & Improves Deflection Performance 85 86 Temporary Bracing Quiz 3 87 88 Axial Force Design Terms compression tension Discussed Further in Sections 06 & 07 89 Usually Measured in pounds, kips, or tons 90 15
Transverse Compression/Tension Chords Includes Radial & Tangential Directions 91 92 Force Diagram Stress Usually Measured in psi Also Known as a Free Body Diagram 93 94 Bending Stress Moment Usually Measured in psi 95 96 16
Compression Parallel-to-Grain Compression Perpendicular-to- Grain 97 98 Tension Parallel-to-Grain Shear Horizontal shear 99 100 Combined Stress Index (CSI) Load CSI TC 0.84 BC 0.52 WB 0.51 Shall Not Exceed 1.00 or 100% Stressed 101 102 17
Dead Load Live Load 103 Image courtesy of TrusJoist, A Weyerhaeuser Business 104 Wind Load Reaction Usually Measured in psf 105 106 Uniform Load Concentrated Load 107 108 18
This image cannot currently be displayed. Load-Bearing Wall Deflection 109 110 Creep Camber Deflection / Time 111 112 Quiz 4 Lumber Terms 113 Discussed Further in Section 05 114 19
Softwoods Cambium No Reference to Hardness 115 116 Heartwood Early Wood Sapwood Courtesy of Wood Engineering and Construction Handbook 117 Also Called Spring Wood 118 Late Wood Dense Also Called Summer Wood 119 120 20
Pith Juvenile Wood Cross section of 24- year-old tree in an unmanaged forest Cross section of 14- year-old tree in a high yield forest Courtesy of Wood Engineering and Construction Handbook 121 122 Compression Wood Fiber Saturation Point Shrinks Excessively Lengthwise Compression Wood 123 Between 25 to 30% 124 Seasoning Lumber 125 126 21
Board Dimension Lumber 127 128 Nominal Size 2 x 4 1.5 Warp 2 x 6 3.5 1.5 BOW CROOK 5.5 Selections from ANSI/TPI 1-2002 2 x 8 7.25 1.5 2 x 10 9.25 1.5 CUP TWIST 2 x 12 1.5 11.25 129 130 Defect Decay 131 132 22
Grade/ Visual Grade Machine Evaluated Lumber (MEL) 133 134 Machine-Stress Rated Lumber (MSR) Compound Cut #1 #2 Bending Stress = 1650 psi Design Bending Stress MOE Modulus = 1,500,000 of Elasticity psi 135 136 Structural Composite Lumber (SCL) Plywood Structural Use 137 Thin Sheets of Wood Veneer- called Plys 138 23
I-Joists Laminated Veneer Lumber (LVL) Used in Floors & Roofs 139 Veneer Thickness Does Not Exceed ¼ 140 Parallel Strand Lumber (PSL) Laminated/Oriented Strand Lumber Strand Least Dimension Does Not Exceed ¼ Average Length is Min. of 150X Strand Least Dimension 141 142 Quiz 5 Miscellaneous Construction Terms 143 144 24
Anchorage Beam Pocket 145 146 Bird s Mouth Cut Built-Up Beam 147 148 Built-Up Roof CAD 4 5 3 2 1 149 Courtesy of MiTek Industries, Inc. 150 25
Clinched Nail Construction Design Documents 151 152 Conventional Framing Ribbon 153 154 Rim Joist Scupper 155 156 26
Quiz 6 Feedback 157 158 27