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

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N
Nails:
lateral resistance, 75–76
sizes of, 74–75
toe-nail connections, 77
withdrawal resistance, 75
National Design Specification for
wood, 44–46
P
Patented forms for concrete floors:
adjustable steel forms, 366–367
cellular-steel systems, 373–374
corrugated-steel forms, 373
fiberglassdomes, 370
flangeforms, 365–366
horizontal shoring, 375–376
longdomes, 370
longforms, 367–369
plastic forms, 371–373
steeldomes, 369–370
Patented shores, 166–170
Placement of fresh concrete, 39
Plastic forms, 73
Plastic molds, 408
Plyform:
allowable stresses, 62
equations for allowable
pressure, 62–63
maximum pressures on,
64–66
physical properties of,
60–61
Plywood:
allowable stresses, 55
equations for allowable
pressure, 62–63
maximum pressures on, 64–66
physical properties, 54–57
Portland Cement Association
(PCA), 22
Pressure of concrete on formwork:
column forms, 31–35
slab forms, 36–38
wall forms, 23–30
Procedure for erection of footing
forms, 202–204
Properties of S4S lumber, 41–44
R
Removal of concrete forms, 15,
159–160
Roofs (see Thin-wall roof slabs)
S
Scaffolding (see Tubular steel
scaffolding)
Shear stress by modified method,
100–104
Shear stress in beams, 98–100
Shear-plate connectors, 83–88
Shores for formwork:
forces acting on vertical shores,
186
guideline for safety, 471–491
patented shores, 166–170
selecting size and spacing of
shores, 174
wood post shores, 165–166
Shoring safety:
flying deck forms, 489–490
general requirement, 475–476
guidelines for safety, 491
horizontal shoring beams,
485–486
rolling shore brackets, 487–488
scaffold shoring, 481–482
single post shores, 483–485
tube and coupler shoring,
479–480
tubular welded frames, 477–478
Size adjustments for lumber, 44–49
Slipforms:
bridge piers, 424
buildings, 426–428
forms, 415
jacks, 419
lining for shafts, 428–429
operation of, 422
sandwich wall, 422
sheathing, 418
silos and mills, 423
special structures, 429–430
suspended scaffolding, 419
towers, 425–426
wales or ribs, 418
yokes, 418
Split-ring connectors, 82–83
Stability of bending members,
93–95
Stained concrete, 396
Stamped concrete, 397
Steel forms, 72
Stresses, allowable unit in:
lumber, 44–46
Plyform, 62
plywood, 65
Index 517
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