Structural Timber Design

Structural Timber Design is a comprehensive textbook that provides students of building and civil engineering courses with a wealth of information and in-depth guidance on design methods to the recently revised BS 5268 : Part 2 and the proposed Eurocode 5. It is also an invaluable reference source and design aid for practising engineers and architects. The text provides a step-by-step approach to the design of all the most commonly used timber elements and connections (illustrated by detailed work examples), and encourages the use of computers to carry out design calculations. I t covers the characteristics of timber; a review of BS 5268: Part 2 and its requirements; the design of beams and columns of solid, glued laminated and composite sections and mechanical and glued timber connections. The book also reviews the proposed Eurocode 5 and its limit states requirements, including the design of flexural and axially loaded members and connections. Contents......Page 6 Preface......Page 12 1.2 The structure of timber......Page 14 1.3.1 Natural defects......Page 16 1.3.2 Chemical defects......Page 17 1.4.2 Hardwoods......Page 18 1.5.1 Moisture content......Page 19 1.5.3 Slope of grain......Page 20 1.6 References......Page 21 2.1 Introduction......Page 22 2.2 Design Philosophy......Page 23 2.3.2 Machine grading......Page 25 2.4 Strength classes......Page 26 2.5.2 Service classes......Page 27 2.5.4 Duration of loading......Page 29 2.5.5 Section size......Page 30 2.5.7 Additional properties......Page 31 2.6 Symbols......Page 32 2.7 References......Page 33 3.2 What is Mathcad?......Page 34 3.2.2 Definitions and variables......Page 35 3.3.4 Working with units......Page 37 3.5 References......Page 38 4.2 Design considerations......Page 39 4.3 Bending stress and prevention of lateral buckling......Page 40 4.3.1 Effective span, L [sub (e)]......Page 41 4.3.3 Depth factor, K [sub (7)]......Page 42 4.3.5 Lateral stability......Page 43 4.3.6 An illustrative example......Page 44 4.4.1 Deflection limits......Page 45 4.4.3 Bending deflection......Page 46 4.5 Bearing stress......Page 47 4.5.1 Length and position of bearings......Page 48 4.6.1 Shear at notched ends......Page 49 4.7 Suspended timber flooring......Page 50 4.8 References......Page 52 Example 4.1......Page 53 Example 4.2......Page 56 Example 4.3......Page 59 Example 4.4......Page 63 5.2.1 Design considerations......Page 69 5.2.2 Slenderness ratio, [lambda]......Page 70 5.2.3 Modification factor for compression members, K [sub (12)]......Page 71 5.2.4 Members subjected to axial compression only (Clause 2.11.5)......Page 73 5.2.5 Members subjected to axial compression and bending (Clause 2.11.6)......Page 74 5.2.6 Design of load-bearing stud walls......Page 75 5.3 Design of tension members (Clause 2.12)......Page 76 5.3.3 Members subjected to axial tension only......Page 77 5.3.4 Combined bending and tensile stresses......Page 78 Example 5.1......Page 79 Example 5.2......Page 82 Example 5.3......Page 86 Example 5.4......Page 88 Example 5.5......Page 92 6.1 Introduction......Page 95 6.3.2 Combined-grade members......Page 97 6.3.3 Permissible stresses for horizontally glued laminated members......Page 99 6.4 Grade stresses for vertically glued laminated beams......Page 100 6.4.1 Permissible stresses for vertically glued laminated members......Page 102 6.6 Curved glued laminated beams......Page 103 6.7 Bibliography......Page 105 Example 6.1......Page 106 Example 6.2......Page 110 Example 6.3......Page 115 Example 6.4......Page 126 Example 6.5......Page 132 7.1 Introduction......Page 136 7.2 Transformed (effective) geometrical properties......Page 137 7.3 Plywood......Page 138 7.4 Design condsiderations......Page 140 7.4.1 Bending......Page 141 7.4.2 Deflection......Page 142 7.4.4 Rolling shear......Page 143 7.4.6 Web-stiffeners......Page 144 Example 7.1......Page 145 Example 7.2......Page 150 8.1 Introduction......Page 156 8.2 Spaced Columns......Page 157 8.3.2 Modes of failure and permissible loads......Page 158 8.3.3 Shear capacity of spacer blocks......Page 160 Example 8.1......Page 161 Example 8.2......Page 165 9.1 Introduction......Page 172 9.2 General design considerations......Page 173 9.3 Joint slip......Page 174 9.4 Effective cross-section......Page 175 9.5 Spacing rules......Page 176 9.6 Multiple shear lateral loads......Page 178 9.7 Nailed joints......Page 179 9.7.2 Pre-drilling......Page 180 9.7.3 Basic single shear lateral loads......Page 182 9.7.4 Axially loaded nails (withdrawal loads)......Page 185 9.7.5 Permissible load for a nailed joint......Page 186 9.8 Screwed joints......Page 188 9.8.1 Basic single shear lateral loads......Page 189 9.8.2 Axially loaded screws (withdrawal loads)......Page 190 9.8.3 Permissible load for a screwed joint......Page 191 9.9 Bolted and dowelled joints......Page 192 9.9.1 Basic single shear lateral loads......Page 193 9.9.2 Permissible load for a bolted or dowelled joint......Page 197 9.10 Moment capacity of dowel-type fastener joints......Page 198 9.11 Connectored joints......Page 201 9.11.1 Toothed-plate connectors......Page 202 9.11.2 Split-ring and shear-plate connectors......Page 204 9.11.3 Metal-plate connectors......Page 206 9.12.1 Durability classification......Page 208 9.13 References......Page 209 Example 9.1......Page 210 Example 9.2......Page 212 Example 9.3......Page 214 Example 9.4......Page 217 Example 9.5......Page 221 Example 9.6......Page 223 Example 9.7......Page 226 Example 9.8......Page 229 10.1 Introduction......Page 232 10.2 Design philosophy......Page 233 10.4 Material properties......Page 234 10.4.1 Design values......Page 236 10.5 Ultimate limit states......Page 237 10.5.1 Bending......Page 238 10.5.2 Shear......Page 240 10.5.3 Compression perpendicular to grain (bearing)......Page 241 10.5.4 Compression or tension parallel to grain......Page 242 10.5.6 Columns subjected to combined bending and axial compression......Page 243 10.5.7 Dowel-type fastener joints......Page 244 10.6.1 Deflections......Page 252 10.6.2 Vibrations......Page 253 10.6.2 Joint slip......Page 254 Example 10.1......Page 255 Example 10.2......Page 261 Example 10.3......Page 264 Appendix A: Section Sizes for Softwood Timber......Page 270 Appendix B: Weights of Building Materials......Page 272 Appendix C: Related British Standards for Timber Engineering......Page 273 D......Page 276 L......Page 277 Y......Page 278 Provides HND and undergraduate students of building and civil engineering courses with information and guidance on design methods to the revised BS 5268: Part 2 and the proposed Eurocode 5. This book is also useful to practising engineers. It provides a step-by-step approach to the design of the commonly used timber elements and connections. Provides a comprehensive undergraduate text on structural timber design with detailed guidance on how to carry out design calculations. First the design of basic elements is explained and illustrated, followed by the design of more specialized elements. There are also worked examples. Timber has always been one of the more plentiful natural resources available and consequently is one of the oldest known materials used in construction.