Formwork for Concrete Structures by R.L.Peurifoy and G.D- By EasyEngineering.net

Downloaded From : www.EasyEngineering.net
Contents
vii
Allowable Pressure Based on Shear Deflection . . . . 63
Tables for Determining the Allowable Concrete
Pressure on Plyform . . . . . . . . . . . . . . . . . . . . . . . . 64
Maximum Spans for Lumber Framing Used to
Support Plywood . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Use of Plywood for Curved Forms . . . . . . . . . . . . . . 66
Hardboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Fiber Form Tubes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Steel Forms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Aluminum Forms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Plastic Forms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Form Liners . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Nails . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Withdrawal Resistance of Nails . . . . . . . . . . . . . . . . . 75
Lateral Resistance of Nails . . . . . . . . . . . . . . . . . . . . . 75
Toe-Nail Connections . . . . . . . . . . . . . . . . . . . . . . . . . 77
Connections for Species of Wood for Heavy
Formwork . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Lag Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Withdrawal Resistance of Lag Screws . . . . . . . . . . . 78
Lateral Resistance of Lag Screws . . . . . . . . . . . . . . . . 79
Timber Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
Split-Ring Connectors . . . . . . . . . . . . . . . . . . . . . . . . . 82
Shear-Plate Connectors . . . . . . . . . . . . . . . . . . . . . . . . 83
Split-Ring and Shear-Plate Connectors in
End Grain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
Penetration Requirements of Lag Screws . . . . . . . . . 84
Form Ties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Concrete Anchors . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
ww.EasyEngineering.n
5 Design of Wood Members for Formwork . . . . . . . . 87
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
Arrangement of Information in This Chapter . . . . . 87
Lumber versus Timber Members . . . . . . . . . . . . . . . . 88
Loads on Structural Members . . . . . . . . . . . . . . . . . . 89
Equations Used in Design . . . . . . . . . . . . . . . . . . . . . . 89
Analysis of Bending Moments in Beams with
Concentrated Loads . . . . . . . . . . . . . . . . . . . . . . . . 90
Analysis of Bending Moments in Beams with
Uniformly Distributed Loads . . . . . . . . . . . . . . . . 91
Bending Stress in Beams . . . . . . . . . . . . . . . . . . . . . . . 92
Stability of Bending Members . . . . . . . . . . . . . . . . . . 93
Downloaded From : www.EasyEngineering.net