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|rum-24305rli/*Sigrjabl:LEV+f.4&--2...<.==:A-/11*5ma*E#31*Niek*41-'"ES a»9*4*2,-EE:*Ma\923*k.14*ith*%3,:.*fditi@frE>IC@ <br />11.2 Withdrawal Design Values <br />11.2.1 Lag Screws <br />11.2.1.1 The withdrawal design values; in lbs.tin. of <br />penetration, for a single lag screw inserted in side grain- <br />with the lag screw axis perpendicular to the u,ood fibers, <br />shall be determined from Table ] 1.2A or Equation 1 1.2-1. <br />11.2,1·.2 When lag screws are loaded in witbdrawa] <br />from end grain: nominal withdrawal design values, W. <br />shall be multiplied by the end grain factor: Ceg = 0.75. <br />1].2.1.3 When lag screws are loaded in withdrawal, <br />the allowable tensile strength of the lag screw at the Det <br />(root) section shall not be exceeded (see 10.2.3). <br />within Ihe range of specific gravities and screw diameters <br />given in Table 11.2A. Tabulated nominal design values, W, <br />shall bemultiplied by all applicable adjustment factors (sae <br />Table 10.3.1) to obzain allowable design values, W' <br />W=1800G3/2[)3„(11.2-1) <br />Table 11.2A Lag Screw Withdrawal Design Values (W)1 <br />Tabulated ithdrawal design values (W) are in pounds per inch of thread penetration into side grain of main member. <br />Length of thread penetration in main member shall not include the length of the tapered tip (see Appendix L). <br />Specific <br />Gravity Lag Screw Unthreaded Shank Diameter: D <br />G 1/4"5/16" 3/8"7/16"1/2"5/8"3/4"7/8"1" -4--9/8" 1-1/4" <br />0.73 397 ,469 538 604 668 789 905 1016 ]123 1226 1327 <br />0.71 381 450 516 579 640 757 868 974 1077 1176 1273 <br />0.68 357 422 4%4 543 600 709 813 913 1009 1103 1193 <br />0.67 349 413 473 531 587 694 796 - 893 987 1078 1167 <br />0.58 281 332 381 428 473 559 641 719 795 869 940 <br />0.55 760.307 : 352 395 42/ 516 592 664 734 .802 868 <br />0.51 232 274 .314 353 390 461 528-593 656 716 775 <br />0.50 .. , 225 266 205 342 378 447 513·576 636 695 752 <br />0.49 218 258 .296 332 367 434 498 559 617 674 730 <br />0.47 ·205 .242 278 312 345 408 467 525 580 634 686 <br />0.46 199 235 269 302 334 395 453 508 · 562 613 664 <br />0.44 186 220 252 283 312 369 423 475 525 574 621 <br />0.43 179 · 212 243 273 302 357 409 459 508 554 600 <br />0.42 173 .205 235 264 291 344 395 443 490 535 579 <br />0.41 167 198 226 254 281 332 38]428 473 516 559 <br />0.40 161 190 218 245 271 320 367 412 455 497 538 <br />0.39 155 1.83 210 236 26] , 308 353 397 438 479 518 <br />0.38 149 176 202 227 251 296 340 381 422 461 498 <br />0.37 143 169 194 218 241 285 326 367 405 443 479 <br />0.36 137 163 186 209 231 273 313 352 389 425 460 <br />0.35 132 ]56 179 200 222 262 300 337 373 407 441 <br />0.31 110 130 149 1.67 185 218 250 281 311 339 367 <br />1. Tabulated withdrawal design values (W) for lag screw conne :tions shall be mu Itiplied by all applicable adjustment factors f see Table 10.3.11 <br />AMER]CAN WOOD COLNZIL