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1 BCSI 06  For information on:  Jobsite storage  Truss handling  Temporary bracing  Fall protection  Construction loading.

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Presentation on theme: "1 BCSI 06  For information on:  Jobsite storage  Truss handling  Temporary bracing  Fall protection  Construction loading."— Presentation transcript:

1 1 BCSI 06  For information on:  Jobsite storage  Truss handling  Temporary bracing  Fall protection  Construction loading

2 2 Contents B1 – Handling, Installation and Bracing B2 – Installation and Bracing B3 – Web Bracing/Reinforcement B4 – Construction Loading B5 – Damage, Modifications and Errors B6 – Gable End Frame Bracing B7 – Parallel Chord Trusses B8 – Toe-nailing for Uplift B9 – Multi-Ply Trusses B10 – Post Frame Trusses B11 – Fall Protection

3 Development of BCSI Engineers Manufacturers Suppliers Contractors

4 4 BCSI Booklet Replaces… HIB-91 Booklet

5 5 BCSI B-Series

6 6 BCSI B-Series Replaces... HIB-91 Sheet HIB-98 Poster WTCA-B1 Warning Poster TTB WTCA-B2

7 B1 Guide for Handling, Installing & Bracing  Consequences of improper installation may be collapse of the structure

8 8 B1 Summary Sheet HIB-91 Sheet WTCA-B1 Warning Poster

9 9 B1 Banding Warning

10 10 B1 Handling

11 11 B1 Handling

12 12 B1 Storage

13 13 B1 Storage

14 14 B1 Hand Erection

15 15 B1 Hoisting

16 16 B1 Hoisting Recommendations From BCSI Booklet

17 17 B1 Hoisting Recommendations From BCSI Booklet

18 18 B1 Hoisting Recommendations From BCSI Booklet

19 19 B1 Bracing Warning

20 20 B1 Ground Bracing

21 B1 Top Chord Bracing See TCTLB Table

22 22 B1 Bottom Chord Bracing

23 23 B1 Web Plane Bracing

24 Lateral brace splicing 24 Look for “Truss Brace Splicing Methods” in the November SBC Magazine

25 25 B1 PCT Bracing (PCT)

26 26 B1 Diagonal Bracing

27 27 B1 Truss Installation

28 28 B1 Constructions Loads

29 29 B1 Construction Loads

30 30 B1 Alterations

31 31 B2 Truss Installation & Temporary Bracing

32 32 B2 Scope From p.8:

33 33 B2 Scope  B2 Doesn’t Cover These 3x2 or 4x2 Flat Trusses Trusses spaced > 2 ft. o.c. From p. 8

34 34 B2 Warnings

35 B2 Top Chord Bracing  Ground bracing not shown  Take special care with spans over 60 ft.

36 B2 Checklist

37 37 B2 Steps to Setting Trusses

38 B2 Step 2 - Ground Braces

39 B2 Step 3 - Set First Truss

40 B2 Step 4 - Next 4 Trusses

41 41 B2 Step 4 - TCTLB Options

42 42 B2 Note on Bracing Materials

43 43 B2 Step 5 - Top Chord Diagonals

44 44 B2 Step 5 - Top Chord Sheathing

45 45 B2 Step 6 – Web Bracing

46 46 B2 Step 6 – High End Trusses

47 47 B2 Step 7 – Bottom Chord Bracing

48 48 B2 Step 8 – Repeat Groups of 4

49 49 B2 Sheath Early and Often

50 50 B2 Alternate Installation Method

51 51 B2 Special Conditions

52 52 B3 Web Member Permanent Bracing/Web Reinforcement

53 B3 Compression Web Members  Unstable if unrestrained  Check Design Drawing if restraint req’d

54 54 B3 Bracing vs. Reinforcement Bracing provides lateral support, reducing buckling length Reinforcement increases cross-section, making web more stable

55 55 B3 Six Methods of Restraint  These items apply to all six methods:

56 56 B3 CLBs and Diagonals

57 57 B3 CLBs and Diagonals

58 58 B3 CLBs and Diagonals

59 59 B3 T-Reinforcement

60 60 B3 L-Reinforcement

61 61 B3 Scab Reinforcement

62 62 B3 Metal Reinforcement

63 63 B3 Stacked Webs

64 64 B3 Gable End Frame Bracing

65 65 B3 Gable End Frames  Designed to transfer vertical loads  But may also experience lateral loads  Sheathing, bracing and connections must be designed for this transfer

66 66 B3 Load Transfer Path

67 B3 Poorly Designed System

68 B3 Design Considerations  Gable End Frame  Reinforcement prevents failure of individual vertical webs  Frame to End Wall  Correct connection prevents hinge joint  Bracing, blocking and diaphragm design creates safe load path

69 69 B3 Bracing and Blocking

70 70 B3 Bracing and Blocking

71 B3 Gable End Reinforcement  Horizontal reinforcement:

72 72 B3 Gable End Reinforcement  Individual L- or T-reinforcements

73 B3 Gable End Reinforcement  Scab reinforcements

74 74 B3 Building Designer Detail

75

76 B3 Avoid Hinge Joint  Balloon Framed End Wall

77 77 B3 Scissor Truss End Wall

78 78 B3 Avoid hinge points in walls! Additional Note: This wall will not meet the prescriptive method criteria under IRC for a braced wall.

79 79 B4 Construction Loading

80 80 B4 Construction Loads

81 81 B4 Loading DOs and DON’Ts

82 82 B4 Loading DOs and DON’Ts

83 83 B4 Loading DOs and DON’Ts

84 84 B4 Loading DOs and DON’Ts

85 85 B4 Loading DOs and DON’Ts

86 86 B4 Loading DOs and DON’Ts

87 87 B4 Loading DOs and DON’Ts

88

89 89 B5 Truss Damage, Modifications and Installation Errors

90 B5 Truss Damages

91 91 B5 Steps for Repair

92 B5 Repair Techniques

93 93 B5 Report Damage

94 B5 Truss Repair Detail

95 B6 Section  B6 used to be on Gable end bracing that information has now moved to section B3.  B6 is intended to be used for additional topics in future additions of BCSI 95

96 96 B7 Parallel Chord Trusses

97 97 B7 Lumber Orientation Guidelines for 3x2 or 4x2 only For 2x_ orientation see BCSI-B2

98 B7 PCT Bearing

99 99 B7 Temporary Bracing

100 100 B7 Stabilize Truss Ends  Temporary Bracing or Permanent Blocking

101 101 B7 Correct Placement

102 102 B7 Truss Tags

103 B7 Strongback Bridging  Helps limit deflection and/or vibration

104 104 B7 Construction Loads on PCT

105 105 B8 Toe-Nailing for Uplift

106 106 B8 Uplift Forces

107 107 B8 Toe-Nailed Connections  Are three toe-nails enough?

108 108 B8 1- Proper Toenail Installation

109 109 B8 2- Top Plate Lumber  Grade and species

110 110 B8 3- Type of Nails 0.162″ x 3.5″

111 B8 Is Toe-Nailing Enough?  Toe-nail values must exceed expected uplift For example: A 16d common in a Southern Pine top plate offers 72 pounds of uplift resistance. If there are three toe-nails, the total uplift resistance Is 3x72=216 pounds 72

112 112 B8 Load Duration Factors For wind uplift resistance use the factor of 1.6. Therefore, 216x1.6 = 346 pounds

113 113 B8 Alternatives to Toe-Nailing  Check published uplift capacities of mechanical connectors

114 114 R Truss to wall connection  Trusses shall be connected to wall plates by the use of approved connectors having a resistance to uplift of not less than 175 pounds (79.45 kg.) and shall be installed in accordance with the manufacturer's specifications. For roof assemblies subject to wind uplift pressures of 20 pounds per square foot (0.958 kN/m2) or greater, as established in Table R301.2(2), adjusted for height and exposure per Table R301.2(3), see section R

115 115 IRC R  The code requirement was added in the IRC 2003 in a perhaps well-intentioned effort to address a perceived issue from the proponent's point of view.  Now that it is in the code, it is proving difficult to remove.  A number of code jurisdictions have amended the language or struck the language out of their code adoption.  The 175 lb value is unrelated to any real design parameters or linked to any truss length. It arbitrarily discriminates against one well respected construction method. No specific evidence was or can be provided to justify this requirement.

116 116 IRC R  TPI 1 requires that a Truss Design Drawing include reaction forces and directions, which would include a value for uplift based upon the structure's design parameters for wind.  There is no valid reason for not using this calculated value in the consideration of the uplift connection requirements.

117 IRC R  Much of the US is in the 90 mph basic wind speed zone.  The resistance for uplift, beyond the prescriptive fastening requirements of Table R602.3(1) is really seldom an issue, especially for structures categorized as Exposure B and with a Mean Roof Height of less than 30 feet.  IRC Table R301.2(2) is used to trigger the need for special connection requirements per Table R Only high wind speed areas, highly exposed structures or extremely tall structures ever qualify for the special requirements. When the calculated uplift requires a connection of a specific value, WTCA supports providing resistance in a manner acceptable to the EOR or building code official, not based upon an arbitrary requirement.

118 118 B9 Multi-ply Girders

119 B9 Girders  Designed to carry extra loads  Max. 6 plies, fastened together to act as one 4-ply 5-ply

120 120 B9 Fastener Schedule  Specified on Truss Design Drawing SAMPLE

121 121 B9 Nail Fasteners  Fasteners using nails only are specified on girders with three plies or less

122 122 B9 Screw Fasteners  Special screws on up to four plies

123 123 B9 Screw Fasteners  Screws on 2-ply 3x or 4x2 floor-type trusses

124 124 B9 Bolt Fasteners  Bolts on 4 to 6 plies  In addition, nails may also be required

125 125 B9 Good Installation Practices  Fasten plies together before lifting, if possible

126 126 B10 Post Frame Trusses HIB-98 Poster

127 B10 Post Frame Trusses  Part of an engineered building system  Spaced at 4′ to 12′ o.c.  Heels attached to posts fixed in ground or slab  Purlins attached directly to truss top chords

128 B10 Truss Storage

129 129 B10 Installation

130 130 B10 Installation

131 131 B10 1- Ensure Stable Columns

132 132 B10 2- Stable Base Unit

133 133 B10 3- Bracing of Base Unit  Top Chord A professional engineer should design a bracing plan for truss spans over 60’ per BCSI Fig.B2-13

134 134 B10 3- Bracing of Base Unit  Bottom Chord

135 135 B10 3- Bracing of Base Unit  In the Roof Plane - or -

136 136 B10 3- Bracing of Base Unit  In the Web Plane

137 137 B11 Fall Protection & Trusses

138 138 B11 Fall Protection Warning Trusses alone are not designed to support fall protection anchors

139 B11 Impact Loads  A falling worker could cause the trusses to collapse in a domino effect

140 140 B11 Safer Options  Option 1: Scaffolding

141 141 B11 Safer Options  Option 1: Roof Peak Anchor

142 142 B11 Safer Options  Option 1: Ground Assembly

143 143 Jobsite Safety Package  B1 through B4  Handling Checklist

144 144 Truss Tags

145 145 Questions on BCSI?


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