Timber Designers' Manual

✍ Scribed by E. C. Ozelton, J. A. Baird

• Publisher: Wiley-Blackwell
• Year: 2002
• Tongue: English
• Leaves: 554
• Edition: 3
• Category: Library

✦ Synopsis

This major reference manual covers both overall and detail design of structural timber, including aspects such as shear deflection, creep, dynamic and lateral stability considerations for flexural members.

It has been substantially revised to take account of changes since the last edition, nearly 20 years ago, and to include the latest revision of British Standard BS 5268-2 : 2002, which has brought design concepts closer to European practice and Eurocode 5.

New features of the Third Edition include:

• revised information on bolt values including a consideration of improved performance using 8.8 grade bolts
• new chapters on composite sections and Eurocode 5 on structural timber
• new developments in materials and products
• horizontal roof and floor diaphragms
• vertical shear walls

The manual continues to provide extensive tables and coefficients that will save the practising engineer many design hours. It will also be of interest as a reference for civil engineering undergraduates and to timber manufacturers. Whilst the design examples in the book are based on BS 5268, a large part of the content will have international appeal, whatever code or standard is being used.

From reviews of the last edition

''the complete design manual ... a 'must''' – Timber Trades Journal

''the manual continues its established position as an authoritative reference and in providing numerous time saving design aids.'' – Institute of Wood Science Journal

✦ Table of Contents

Contents......Page 5
Preface......Page 11
Acknowledgements......Page 12
1.1 Introduction......Page 13
1.2 Timber......Page 14
1.3 Plywood......Page 34
1.4 Particleboard, oriented strand board, cement-bonded particleboard and wood fibreboards......Page 38
1.5 Engineered wood products......Page 43
1.6 Mechanical fasteners......Page 46
1.7 Adhesives used in timber engineering......Page 50
2.1 Introduction......Page 53
2.2 Derivation of basic stress and characteristic strength values......Page 54
2.3 Modulus of elasticity and shear modulus......Page 57
2.4 Grade stress......Page 58
2.6 Moisture content......Page 60
3.2 Load duration......Page 62
3.3 Concentrated loadings......Page 63
3.5 Imposed loadings for floors......Page 64
3.7 Snow loading......Page 65
3.8 Roof loadings on small buildings......Page 66
3.9 Wind loading......Page 67
3.10 Unbalanced loading......Page 71
3.12 Special loadings......Page 72
4.2 Design considerations......Page 76
4.4 Load-sharing systems......Page 77
4.5 Load–duration factor......Page 80
4.6 Lateral stability......Page 81
4.7 Moisture content......Page 82
4.8 Bending stresses......Page 83
4.9 Depth and form factors......Page 84
4.10 Bearing......Page 85
4.11 Shear......Page 87
4.12 The effect of notches and holes......Page 89
4.13 Shear in beams supported by fastenings and in eccentric joints......Page 92
4.14 Glue-line stresses......Page 95
4.15 Deflection......Page 98
4.16 Bending and shear deflection coefficients......Page 107
5.2 General design......Page 111
5.3 Principal beams of solid timber......Page 112
5.4 Load-sharing systems of solid timber......Page 115
5.6 Principal members bending about both the x–x and y–y axes......Page 118
6.3 Connection of members......Page 129
6.5 Design example......Page 134
7.1 Introduction......Page 135
7.2 Timber stress grades for glulam......Page 138
7.3 Strength values for horizontally or vertically laminated beams......Page 139
7.4 Appearance grades for glulam members......Page 142
7.5 Joints in laminations......Page 144
7.7 Preservative treatment......Page 148
7.9 Tables of properties and capacities of standard size in C24 grade......Page 149
7.10 Typical designs......Page 162
7.11 The calculation of deflection and bending stress of glulam beams with tapered profiles......Page 164
8.2 Primary design considerations......Page 176
8.3 Design examples......Page 184
8.4 Web splices......Page 189
8.5 Web stiffeners......Page 190
8.6 Holes or slots in ply web beams......Page 192
8.7 Proprietary sections......Page 193
9.2 Buckling of rectangular solid and glulam sections......Page 202
9.3 Design examples......Page 207
9.4 Partially restrained thin web I beams......Page 211
10.2 Kerto-LVL (Laminated Veneer Lumber)......Page 213
10.3 Versa-Lam SP LVL (Laminated Veneer Lumber)......Page 214
10.4 Parallam PSL (Parallel Strand Lumber)......Page 216
10.5 TimberStrand (Laminated Strand Lumber)......Page 218
11.2 Span and end joint arrangements......Page 223
11.3 Nailing of decking......Page 226
11.4 Design procedure......Page 229
11.6 Example of design of decking......Page 230
12.1 Deflection limits......Page 233
12.2 Camber......Page 234
12.4 Deflection due to wind uplift on roofs or wind on walls......Page 235
12.6 Examples of cases which require special consideration in deflection/camber calculations......Page 236
12.7 Effect of deflection on end rotation of beams......Page 246
13.3 Effective cross section......Page 248
13.4 Combined bending and tensile loading......Page 249
13.5 Tension capacities of solid timber sections containing split ring or shear plate connectors......Page 252
14.3 Effective length......Page 254
14.4 Permissible compressive stress......Page 257
14.6 Combined bending and axial loading......Page 258
14.7 Effective area for compression......Page 260
14.9 Bearing at bases......Page 261
14.10 Bearing at an angle to grain......Page 263
15.2 Design example......Page 264
15.3 Deflection of compression members......Page 271
16.2 Combined bending and axial loading for tee sections......Page 273
16.3 Tee section: design example......Page 274
16.4 Spaced columns......Page 277
16.5 Example of spaced column design......Page 279
16.6 Compression members in triangulated frameworks......Page 281
17.2 Timber stress grades for glulam columns......Page 283
17.4 Example of combined bending and compression in a glulam section......Page 285
17.5 Check on strength of a finger joint in combined bending and compression......Page 290
18.1 General......Page 292
18.2 Nailed joints......Page 296
18.3 Screw joints......Page 302
18.4 Bolted joints......Page 307
18.5 Toothed plate connector units......Page 319
18.6 Split ring and shear plate connectors......Page 336
19.1 Introduction......Page 348
19.3 Quality control requirements. General glue joints......Page 349
19.4 The strength of a glue joint......Page 353
19.5 Structural finger joints......Page 354
19.6 Quality control requirements for structural finger joints......Page 356
19.7 The strength and design of finger joints......Page 358
20.2 Forms of construction......Page 364
20.3 Special design considerations......Page 365
20.5 Permissible stresses......Page 368
20.7 Typical design for double-skin panel......Page 369
20.8 Splice plates......Page 375
20.9 Typical design for single-skin panel......Page 377
21.1 Introduction......Page 381
21.2 Loading on trusses......Page 387
21.3 Types of members and joints......Page 388
21.4 Design of a parallel-chord truss......Page 398
21.5 Bowstring trusses......Page 411
21.6 Deflection of trusses......Page 420
21.7 Coefficients of axial loading......Page 423
22.1 Introduction......Page 442
22.2 Properties of timber in fire......Page 443
22.4 Stress grade......Page 445
22.9 Check on the fire resistance of a glulam beam......Page 446
22.10 Check on the fire resistance of a glulam column......Page 447
23.2 No sway condition......Page 450
23.3 With sway condition......Page 452
23.5 Horizontal diaphragms......Page 455
23.6 Vertical shear walls......Page 461
24.2 Durability......Page 466
24.3 Amenability to preservative treatment......Page 468
24.4 Risk and avoidance......Page 469
24.5 Types of preservative......Page 470
24.6 Additional notes on preservation......Page 472
24.7 Publications giving guidance or rules on when to preserve......Page 475
24.8 Moisture content......Page 479
25.2 Species/grades/strength classes......Page 483
25.4 Moisture content......Page 484
25.6 Design data for oak......Page 485
26.1 General......Page 489
26.3 Test procedure......Page 490
27.1 Introduction......Page 492
27.2 Symbols and notations......Page 493
27.3 Design philosophy......Page 495
27.4 Actions......Page 496
27.5 Material properties......Page 499
27.6 Ultimate limit states......Page 503
27.7 Serviceability limit states......Page 516
27.9 Design examples......Page 520
28.1 Weights of building materials......Page 533
28.2 Bending and deflection formulae......Page 535
28.3 Permissible lorry overhangs......Page 547
Index......Page 550