BS 5268-2:1996

Committees responsible
Foreword
Code of practice
Section 1. General
1.1 Scope
1.2 References
1.3 Definitions
1.4 Symbols
1.5 Materials
1.6 Design considerations
Section 2 Timber
Section 3 Glued laminated timber
Section 4 Plywood
Section 5 Tempered hardboard
Section 6 Joints
Section 7 Workmanship, inspection and maintenance
Section 8 Testing
Section 9 Wood particleboard
Annexes
A (normative) Structural timbers
B (normative) Modification factor for compression
     members
C (normative) Efficiency ratings of glued end joints in
     softwoods
D (informative) Species of timber used in the manu-
     facture of plywood
E (informative) Grade marks for plywood
F (informative) Modulus of elasticity and shear modulus
     for tempered steel
G (informative) Derivation of the basic lateral load-
     carrying capacities referred to in section 6
H (normative) Moisture content determination by oven
     dry method
J (informative) Modulus of elasticity and shear modulus
     for particleboard
Tables
1 Moisture content of timber related to service class
2 Softwood combinations of species and visual grade
     which satisfy requirements for various strength
     classes.
3 North American softwood species/grade combinations
     which satisfy the requirements for various strength
     classes.NLGA and NGRDL Joist and plank rules
4 North American softwood species/grade combinations
     which satisfy the requirements for various strength
     classes (NLGA and NGRDL Structural Light Framing and
     Stud rules)
5 North American softwood species/grade combinations
     which satisfy requirements for strength classes
     in accordance with machine stress-related rules
6 Tropical hardwoods which satisfy the requirements
     for strength classes given in BS EN 338 when graded
     to HS grade in accordance with BS 5756
7 Grade stresses and moduli of elasticity for various
     strength classes: for service classes 1 and 2
8 Grade stresses for softwoods graded in accordance
     with BS 4978: for service classes 1 and 2
9 Grade stresses for Canadian softwoods graded in
     accordance with NLGA rules: for services 1 and 2
10 Grade stresses for USA softwoods graded in accordance
     with NHRDL rules: for service classes 1 and 2
11 Grade stresses for North American softwoods graded in
     accordance with N. American MSR rules:classes 1 and 2
12 Grade stresses for tropical hardwoods graded in
     accordance with BS 5756 rules: services classes 1,2
13 Modification factor K2 by which stresses and moduli
     for service classes 1 and 2 should be multiplied
     to obtain stresses and moduli applicable to service
     class 3
14 Modification factor K3 for duration of loading
15 Modification factor K4 for bearing stress
16 Maximum depth to breadth ratios (solid and laminated
     members)
17 Modification factor K9 used to modify the minimum
     modulus of elasticity for trimmer joists and lintels
18 Effective length of compression members
19 Modification factor K12 for compression members
20 Modification factor K13 for the effective length of
     spaced columns
21 Modification factors K15 - K20 for single grade glued
     laminated members and horizontally glued laminated
     beams
22 Modification factors K27-K29 for vertically glued
     laminated members
23 Modification factors K30 - K32 for individually
     designed glued end joints in horizontally glued
     laminated members
24 Values of constants for determining radial stresses
     in pitched cambered softwood beams
25 Section properties of American construction and
     industrial plywood: unsanded and touch sanded
26 Section properties of American construction and
     industrial plywood: sanded
27 Section properties of Canadian Douglas fir and soft-
     wood plywood: unsanded
28 Section properties of Finnish birch plywood: sanded
29 Section properties of Finnish birch-faced plywood:
     sanded
30 Section properties of Finnish conifer plywood: sanded
31 Section properties of Swedish softwood plywood:
     unsanded
32 Section properties of Swedish softwood plywood:
     sanded
33 Modification factor K36 by which the grade stresses
     and moduli for long-term duration and service classes
     1 and 2 for plywood should be multiplied to obtain
     values for other durations and/or service class 3
34 Grade stresses and moduli for service classes 1 and 2
     for American plywood: C-D grade Exposure 1. Unsanded
35 Grade stresses and moduli for service classes 1 and 2
     for American plywood: C-C. Exterior Group 1. Unsanded
Tables 36 - 105
A.1 Names and densities of some structural softwoods
A.2 Names and densities of some structural hardwoods
C.1 Efficiency ratings of some finger profiles
D.1 Species used in American C-D and C-C plywood
D.2 Species used in Canadian plywood
D.3 Species used in Finnish plywood
G.1 Characteristic density of timber at 12% moisture
     content
G.2 Characteristic density of plywood at 12% moisture
     content
Figures
1 Position of end bearing
2 Notched beams
3 Axes in spaced columns
4 Curved glued laminated beam
5 Pitched cambered beam
6 Shear stress in the jointed timber
7 Connector end and edge distances
8 Dimensions of circular recesses for shear-plate
     connector units conforming to BS 1579
E.1 American construction and industrial plywoods
E.2 Canadian Douglas fir and softwood plywoods
E.3 Finnish birch, birch-faced and conifer plywoods
E.4 Swedish softwood plywood
G.1 Diagram indicating the dimensions t1 and t2 of
     nailed/screwed joints
G.2 Bolted/dowelled joints
List of references