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JamStud®

JamStud

JamStud® is a revolutionary addition to the light gauge steel stud industry, producing significant economies in both design and installation when compared with conventional “C” Shaped studs.  JamStud’s unique configuration delivers increased strength and stiffness, minimizing or eliminating the use of built-up jamb and header sections in a curtain wall assembly.  In conventional c-shape construction, jambs are typically the initial components designed.  As different thickness of steel studs is difficult to determine in the field, the rest of the wall studs are kept as the same thickness as the jambs, which may result in less than optimal thickness for the wall.  JamStud’s shape is easily differentiated from the typical c-shape, enabling the selection of the most optimal member sizes. TSN’s 600JAM™ and 800JAM™ product lines are for 6” and 8” walls.

Performance Improvements

  • Increases load capacity over a standard “C-shaped” stud of the same thickness
  • Reduces overall materials used (single “JAM” from double or triple “C-Shape” common)
  • Provides a flat surface for attachment of door or window frame (no additional track required)
  • No welding or fastening built-up members together

Weight Advantages

  • Lighter weight results in easier handling
  • Less weight results in shipping efficiencies

Engineering Advantages

  • Increased stiffness for deflection
  • Simplified jamb and header design
  • Increased load capacity enables selection of optimal thickness of curtain wall studs
Downloads Download Technical data Tech Sheet | Download drawing file DWG | Download specification data Specs | Download BIM data BIM |
Product Information
TSN_JamStud_Header-Sill_Opening

Material Composition

ASTM A1003/A1003M or ASTM A653/A653M, Grade 50 (340), 50ksi (340MPa) minimum yield strength, 65ksi (450 MPa) minimum tensile strength, G-60 (Z180) hot-dipped galvanized coating.

TSN_JamStud_Nomenclature.png
JamStud Section Dimensions
JamStud® Product Profile
Section
(All 50 ksi)
Overall Depth Flange Width Return Lip 1 Return Lip 2 Inside Bend Design Thickness Unit Weight
D B d1 d2 R t (lbs/ft)
(in) (in) (in) (in) (in) (in)
350JAM250-33 3.5 2.5 0.5892 0.5 0.105 0.0346 1.196
350JAM250-43 3.5 2.5 0.6102 0.5 0.105 0.0451 1.553
350JAM250-54 3.5 2.5 0.6332 0.5 0.105 0.0566 1.942
350JAM250-68 3.5 2.5 0.6626 0.5 0.105 0.0713 2.435
350JAM250-97 3.5 2.5 0.7234 0.5 0.105 0.1017 3.438
350JAM350-68 3.5 3.5 0.6626 0.5 0.105 0.0713 2.920
350JAM350-97 3.5 3.5 0.7234 0.5 0.105 0.1017 4.130
350JAM350-118 3.5 3.5 0.7684 0.5 0.105 0.1242 5.005
362JAM250-33 3.625 2.5 0.5892 0.5 0.105 0.0346 1.210
362JAM250-43 3.625 2.5 0.6102 0.5 0.105 0.0451 1.572
362JAM250-54 3.625 2.5 0.6332 0.5 0.105 0.0566 1.966
362JAM250-68 3.625 2.5 0.6626 0.5 0.105 0.0713 2.465
362JAM250-97 3.625 2.5 0.7234 0.5 0.105 0.1017 3.481
362JAM350-68 3.625 3.5 0.6626 0.5 0.105 0.0713 2.950
362JAM350-97 3.625 3.5 0.7234 0.5 0.105 0.1017 4.173
362JAM350-118 3.625 3.5 0.7684 0.5 0.105 0.1242 5.058
400JAM250-33 4 2.5 0.5892 0.5 0.105 0.0346 1.255
400JAM250-43 4 2.5 0.6102 0.5 0.105 0.0451 1.630
400JAM250-54 4 2.5 0.6332 0.5 0.105 0.0566 2.038
400JAM250-68 4 2.5 0.6626 0.5 0.105 0.0713 2.556
400JAM250-97 4 2.5 0.7234 0.5 0.105 0.1017 3.611
400JAM350-68 4 3.5 0.6626 0.5 0.105 0.0713 3.041
400JAM350-97 4 3.5 0.7234 0.5 0.105 0.1017 4.303
400JAM350-118 4 3.5 0.7684 0.5 0.105 0.1242 5.216
550JAM250-33 5.5 2.5 0.5892 0.5 0.105 0.0346 1.431
550JAM250-43 5.5 2.5 0.6102 0.5 0.105 0.0451 1.860
550JAM250-54 5.5 2.5 0.6332 0.5 0.105 0.0566 2.327
550JAM250-68 5.5 2.5 0.6626 0.5 0.105 0.0713 2.920
550JAM250-97 5.5 2.5 0.7234 0.5 0.105 0.1017 4.130
550JAM250-118 5.5 2.5 0.7684 0.5 0.105 0.1242 5.005
550JAM350-68 5.5 3.5 0.6626 0.5 0.105 0.0713 3.405
550JAM350-97 5.5 3.5 0.7234 0.5 0.105 0.1017 4.822
550JAM350-118 5.5 3.5 0.7684 0.5 0.105 0.1242 5.849
600JAM250-33 6 2.5 0.5892 0.5 0.105 0.0346 1.490
600JAM250-43 6 2.5 0.6102 0.5 0.105 0.0451 1.937
600JAM250-54 6 2.5 0.6332 0.5 0.105 0.0566 2.424
600JAM250-68 6 2.5 0.6626 0.5 0.105 0.0713 3.041
600JAM250-97 6 2.5 0.7234 0.5 0.105 0.1017 4.303
600JAM250-118 6 2.5 0.7684 0.5 0.105 0.1242 5.216
600JAM350-68 6 3.5 0.6626 0.5 0.105 0.0713 3.527
600JAM350-97 6 3.5 0.7234 0.5 0.105 0.1017 4.995
600JAM350-118 6 3.5 0.7684 0.5 0.105 0.1242 6.060
800JAM250-43 8 2.5 0.6102 0.5 0.105 0.0451 2.244
800JAM250-54 8 2.5 0.6332 0.5 0.105 0.0566 2.809
800JAM250-68 8 2.5 0.6626 0.5 0.105 0.0713 3.527
800JAM250-97 8 2.5 0.7234 0.5 0.105 0.1017 4.995
800JAM250-118 8 2.5 0.7684 0.5 0.105 0.1242 6.060
800JAM350-68 8 3.5 0.6626 0.5 0.105 0.0713 4.012
800JAM350-97 8 3.5 0.7234 0.5 0.105 0.1017 5.688
800JAM350-118 8 3.5 0.7684 0.5 0.105 0.1242 6.904

Notes:

  1. Effective properties incorporate the strength increase from the cold-work of forming as applicable per AISI A7.2.
  2. Tabulated gross properties are based on the full-unreduced cross section of the studs, away from punchouts.
  3. Allowable moment is the lesser of Mal and Mad. Stud distortional buckling is based on an assumed kΦ = 0.
  4. For deflection calculations, use the effective moment of inertia.
  5. The effective moment of inertia for deflection is calculated at a stress which results in a section modulus such that the stress times the section modulus at that stress is equal to the allowable moment. AISI S100-07 Procedure I for serviceability determination has been used.
JamStud® Section Properties: Gross Properties (for Un-punched Sections)
Section
(All 50 ksi)
Area Ix Sx Rx Iy Ry Jx1000 Cw Ro Xo m ß
(in2) (in4) (in3) (in) (in4) (in) (in4) (in6) (in) (in) (in)
350JAM250-33 0.351 0.734 0.419 1.445 0.329 0.967 0.140 1.206 3.025 -2.476 1.448 0.330
350JAM250-43 0.456 0.945 0.540 1.439 0.424 0.964 0.309 1.565 3.017 -2.471 1.445 0.329
350JAM250-54 0.571 1.171 0.669 1.432 0.526 0.960 0.609 1.953 3.008 -2.465 1.442 0.329
350JAM250-68 0.715 1.450 0.829 1.424 0.653 0.955 1.212 2.443 2.996 -2.457 1.439 0.328
350JAM250-97 1.010 1.999 1.142 1.406 0.904 0.946 3.483 3.431 2.972 -2.441 1.430 0.325
350JAM350-68 0.858 1.870 1.068 1.476 1.471 1.309 1.454 5.401 3.980 -3.456 1.965 0.246
350JAM350-97 1.214 2.586 1.478 1.460 2.050 1.300 4.184 7.627 3.958 -3.441 1.957 0.244
350JAM350-118 1.471 3.082 1.761 1.448 2.457 1.293 7.538 9.227 3.941 -3.430 1.951 0.243
362JAM250-33 0.356 0.795 0.438 1.495 0.333 0.968 0.142 1.277 3.031 -2.453 1.437 0.345
362JAM250-43 0.462 1.024 0.565 1.489 0.430 0.964 0.313 1.656 3.023 -2.447 1.435 0.344
362JAM250-54 0.578 1.269 0.700 1.482 0.533 0.961 0.617 2.066 3.014 -2.442 1.432 0.344
362JAM250-68 0.724 1.573 0.868 1.474 0.662 0.956 1.227 2.583 3.002 -2.434 1.428 0.342
362JAM250-97 1.023 2.169 1.197 1.456 0.916 0.946 3.527 3.625 2.977 -2.418 1.420 0.340
362JAM350-68 0.867 2.023 1.116 1.528 1.491 1.311 1.469 5.715 3.977 -3.430 1.954 0.256
362JAM350-97 1.226 2.801 1.545 1.511 2.078 1.302 4.228 8.065 3.955 -3.415 1.947 0.254
362JAM350-118 1.486 3.340 1.843 1.499 2.491 1.295 7.617 9.753 3.938 -3.404 1.941 0.253
400JAM250-33 0.369 0.995 0.497 1.643 0.346 0.969 0.147 1.506 3.055 -2.386 1.407 0.390
400JAM250-43 0.479 1.283 0.641 1.637 0.446 0.965 0.325 1.951 3.046 -2.381 1.404 0.389
400JAM250-54 0.599 1.591 0.796 1.630 0.554 0.962 0.640 2.432 3.037 -2.375 1.401 0.388
400JAM250-68 0.751 1.975 0.987 1.622 0.688 0.957 1.273 3.038 3.025 -2.368 1.398 0.387
400JAM250-97 1.061 2.730 1.365 1.604 0.953 0.948 3.658 4.255 3.000 -2.352 1.390 0.386
400JAM350-68 0.894 2.525 1.263 1.681 1.547 1.316 1.514 6.736 3.976 -3.354 1.922 0.288
400JAM350-97 1.265 3.503 1.751 1.664 2.158 1.306 4.360 9.488 3.953 -3.339 1.915 0.286
400JAM350-118 1.533 4.184 2.092 1.652 2.587 1.299 7.855 11.458 3.936 -3.328 1.909 0.285
550JAM250-33 0.421 2.063 0.750 2.215 0.390 0.962 0.168 2.703 3.239 -2.158 1.300 0.556
550JAM250-43 0.547 2.667 0.970 2.209 0.503 0.959 0.371 3.497 3.230 -2.153 1.297 0.556
550JAM250-54 0.684 3.317 1.206 2.202 0.625 0.956 0.730 4.352 3.221 -2.147 1.294 0.556
550JAM250-68 0.858 4.129 1.501 2.194 0.776 0.951 1.454 5.423 3.208 -2.139 1.290 0.555
550JAM250-97 1.214 5.747 2.090 2.176 1.077 0.942 4.184 7.559 3.183 -2.123 1.282 0.555
550JAM250-118 1.471 6.881 2.502 2.163 1.285 0.935 7.538 9.058 3.163 -2.111 1.275 0.555
550JAM350-68 1.001 5.180 1.883 2.275 1.743 1.320 1.696 12.048 4.054 -3.084 1.806 0.421
550JAM350-97 1.417 7.228 2.629 2.259 2.434 1.311 4.886 16.898 4.029 -3.069 1.798 0.420
550JAM350-118 1.719 8.673 3.154 2.246 2.921 1.304 8.809 20.344 4.012 -3.057 1.792 0.419
600JAM250-33 0.438 2.522 0.841 2.400 0.402 0.958 0.175 3.209 3.326 -2.094 1.269 0.604
600JAM250-43 0.569 3.261 1.087 2.394 0.519 0.955 0.386 4.150 3.317 -2.088 1.266 0.604
600JAM250-54 0.712 4.058 1.353 2.387 0.644 0.951 0.760 5.163 3.307 -2.082 1.263 0.604
600JAM250-68 0.894 5.055 1.685 2.378 0.801 0.947 1.514 6.431 3.295 -2.074 1.259 0.604
600JAM250-97 1.265 7.047 2.349 2.361 1.111 0.937 4.360 8.956 3.269 -2.058 1.250 0.604
600JAM250-118 1.533 8.447 2.816 2.348 1.327 0.930 7.855 10.726 3.250 -2.045 1.244 0.604
600JAM350-68 1.036 6.309 2.103 2.467 1.799 1.318 1.756 14.285 4.106 -3.006 1.771 0.464
600JAM350-97 1.468 8.816 2.939 2.451 2.513 1.308 5.061 20.020 4.081 -2.990 1.763 0.463
600JAM350-118 1.781 10.588 3.529 2.438 3.017 1.302 9.127 24.090 4.063 -2.978 1.757 0.463
800JAM250-43 0.659 6.378 1.595 3.110 0.572 0.931 0.447 7.513 3.746 -1.869 1.159 0.751
800JAM250-54 0.825 7.949 1.987 3.103 0.710 0.927 0.881 9.340 3.736 -1.862 1.156 0.752
800JAM250-68 1.036 9.923 2.481 3.095 0.883 0.923 1.756 11.624 3.724 -1.854 1.151 0.752
800JAM250-97 1.468 13.893 3.473 3.076 1.225 0.914 5.061 16.161 3.698 -1.838 1.142 0.753
800JAM250-118 1.781 16.707 4.177 3.063 1.464 0.907 9.127 19.330 3.679 -1.825 1.136 0.754
800JAM350-68 1.179 12.165 3.041 3.212 1.990 1.299 1.998 25.787 4.413 -2.733 1.648 0.616
800JAM350-97 1.671 17.065 4.266 3.195 2.782 1.290 5.762 36.082 4.388 -2.717 1.640 0.617
800JAM350-118 2.029 20.553 5.138 3.183 3.341 1.283 10.398 43.367 4.370 -2.705 1.633 0.617

Notes:

  1. Effective properties incorporate the strength increase from the cold-work of forming as applicable per AISI A7.2.
  2. Tabulated gross properties are based on the full-unreduced cross section of the studs, away from punchouts.
  3. Allowable moment is the lesser of Mal and Mad. Stud distortional buckling is based on an assumed kΦ = 0.
  4. For deflection calculations, use the effective moment of inertia.
  5. The effective moment of inertia for deflection is calculated at a stress which results in a section modulus such that the stress times the section modulus at that stress is equal to the allowable moment. AISI S100-07 Procedure I for serviceability determination has been used.
JamStud® Section Properties
Section
(All 50 ksi)
Effective Properties 50 ksi ("net" = Punched Sections) Effective Properties if limited to 33 ksi Strength
Ix Sx Sx (net) Mal Mal (net) Mad Va Va (net) Iye1 Myal1 Myad1 Iye2 Myal2 Ixe Mal Mal(net) Mad
(in4) (in3) (in3) (kips-in) (kips-in) (kips-in) (lb) (lb) (in4) (kips-in) (kips-in) (in4) (kips-in) (in4) (kips-in) (kips-in) (kips-in)
350JAM250-33 0.692 0.331 0.300 9.904 8.995 9.106 1145 527 0.329 6.761 6.157 0.273 5.897 0.714 7.010 6.548 6.973
350JAM250-43 0.933 0.447 0.418 13.371 12.505 13.045 2141 747 0.424 8.738 8.738 0.383 8.097 0.945 9.764 9.389 9.864
350JAM250-54 1.171 0.571 0.545 17.099 16.324 17.616 3371 925 0.526 10.864 10.864 0.508 10.390 1.171 12.370 12.069 13.136
350JAM250-68 1.450 0.748 0.728 22.400 21.809 23.676 4208 900 0.653 13.522 13.522 0.653 13.302 1.450 17.765 17.494 16.378
350JAM250-97 1.999 1.125 1.107 37.597 37.006 34.192 5886 850 0.904 18.806 18.806 0.904 18.806 1.999 25.603 25.240 22.567
350JAM350-68 1.812 0.804 0.774 24.073 23.179 26.651 4208 900 1.471 22.321 22.321 1.471 21.873 1.866 17.681 17.250 20.057
350JAM350-97 2.574 1.267 1.238 37.945 37.068 42.171 5886 850 2.050 31.234 31.234 2.050 31.234 2.586 30.448 29.989 29.198
350JAM350-118 3.082 1.670 1.644 50.000 49.221 52.725 7073 814 2.457 37.545 37.545 2.457 37.545 3.082 37.714 37.206 34.798
362JAM250-33 0.750 0.347 0.313 10.387 9.375 9.461 1102 544 0.333 6.795 6.079 0.273 5.910 0.774 7.345 6.827 7.249
362JAM250-43 1.011 0.468 0.435 14.012 13.038 13.565 2141 802 0.430 8.783 8.663 0.384 8.106 1.024 10.223 9.796 10.265
362JAM250-54 1.269 0.598 0.569 17.908 17.031 18.335 3372 994 0.533 10.921 10.921 0.511 10.406 1.269 12.944 12.598 13.687
362JAM250-68 1.573 0.783 0.761 23.449 22.775 24.670 4375 1007 0.662 13.593 13.593 0.662 13.332 1.573 18.596 18.333 17.149
362JAM250-97 2.169 1.178 1.161 39.389 38.814 35.835 6124 954 0.916 18.908 18.908 0.916 18.908 2.169 26.833 26.483 23.651
362JAM350-68 1.961 0.841 0.808 25.186 24.190 27.689 4375 1007 1.491 22.444 22.444 1.491 21.921 2.019 18.481 18.050 20.857
362JAM350-97 2.787 1.325 1.296 39.672 38.798 43.895 6124 954 2.078 31.410 31.410 2.078 31.410 2.801 31.821 31.370 30.533
362JAM350-118 3.340 1.746 1.721 52.284 51.518 55.170 7363 917 2.491 37.760 37.760 2.491 37.760 3.340 39.444 38.948 36.412
400JAM250-33 0.941 0.397 0.351 11.873 10.514 10.530 991 589 0.346 6.891 5.819 0.275 5.944 0.971 8.375 7.661 8.083
400JAM250-43 1.268 0.534 0.489 15.981 14.635 15.133 2141 967 0.446 8.908 8.380 0.389 8.130 1.283 11.631 11.014 11.479
400JAM250-54 1.591 0.681 0.640 20.397 19.150 20.506 3372 1201 0.554 11.077 11.077 0.520 10.449 1.591 14.708 14.190 15.351
400JAM250-68 1.975 0.891 0.858 26.669 25.675 27.679 4876 1360 0.688 13.790 13.790 0.686 13.411 1.975 21.143 19.215 19.511
400JAM250-97 2.730 1.343 1.351 44.884 40.448 40.871 6839 1299 0.953 19.189 19.189 0.953 19.189 2.730 30.605 30.288 26.975
400JAM350-68 2.447 0.955 0.909 28.602 27.223 30.818 4876 1360 1.547 22.789 22.789 1.530 22.043 2.519 20.930 20.378 23.268
400JAM350-97 3.483 1.502 1.473 44.961 44.092 49.104 6839 1299 2.158 31.903 31.903 2.158 31.903 3.503 36.019 35.587 34.610
400JAM350-118 4.184 1.980 1.955 59.268 58.533 62.640 8235 1256 2.587 38.361 38.361 2.587 38.361 4.184 44.732 44.265 41.343
550JAM250-33 1.974 0.572 0.572 17.118 17.118 14.859 706 703 0.390 7.183 4.661 0.280 6.030 2.019 12.848 12.848 11.473
550JAM250-43 2.644 0.820 0.820 24.561 24.561 21.511 1570 1193 0.503 9.288 6.962 0.400 8.190 2.667 17.716 17.716 16.435
550JAM250-54 3.317 1.043 1.043 31.227 31.227 29.377 3117 1875 0.625 11.554 9.763 0.542 10.559 3.317 22.334 22.334 22.187
550JAM250-68 4.129 1.357 1.357 40.642 40.642 40.041 5350 2534 0.776 14.391 13.625 0.728 13.608 4.129 32.111 32.111 29.669
550JAM250-97 5.747 2.051 2.051 68.578 68.578 62.565 9700 3167 1.077 20.045 20.045 1.077 19.791 5.747 46.849 46.849 41.293
550JAM250-118 6.881 2.502 2.502 85.210 85.210 74.914 11723 3100 1.285 24.010 24.010 1.285 24.010 6.881 57.274 57.274 49.443
550JAM350-68 4.933 1.450 1.450 43.421 43.421 43.539 5350 2534 1.743 23.876 22.948 1.613 22.354 5.144 31.469 31.469 33.109
550JAM350-97 7.160 2.262 2.262 67.718 67.718 70.434 9700 3167 2.434 33.453 33.453 2.434 32.810 7.228 53.935 53.935 51.941
550JAM350-118 8.673 2.976 2.976 89.112 89.112 91.138 11723 3100 2.921 40.250 40.250 2.921 40.250 8.673 67.271 67.271 62.319
600JAM250-33 2.419 0.626 0.626 18.750 18.750 16.312 644 644 0.402 7.257 4.305 0.281 6.049 2.472 14.179 14.179 12.615
600JAM250-43 3.239 0.919 0.919 27.502 27.502 23.662 1432 1235 0.519 9.385 6.495 0.403 8.203 3.261 19.902 19.902 18.114
600JAM250-54 4.058 1.174 1.174 35.140 35.140 32.383 2843 1942 0.644 11.676 9.203 0.546 10.582 4.058 25.073 25.073 24.516
600JAM250-68 5.055 1.526 1.526 45.679 45.679 44.254 5350 2882 0.801 14.544 13.002 0.737 13.650 5.055 36.037 36.037 33.017
600JAM250-97 7.047 2.305 2.305 77.070 77.070 70.137 10653 3964 1.111 20.261 20.261 1.111 19.891 7.047 52.663 52.663 46.417
600JAM250-118 8.447 2.816 2.816 95.893 95.893 84.306 12885 3889 1.327 24.274 24.274 1.327 24.264 8.447 64.455 64.455 55.642
600JAM350-68 6.023 1.628 1.628 48.757 48.757 47.851 5350 2882 1.799 24.160 21.969 1.631 22.421 6.263 35.238 35.238 36.455
600JAM350-97 8.729 2.534 2.534 75.856 75.856 77.711 10653 3964 2.513 33.858 33.858 2.512 32.975 8.816 60.297 60.297 57.903
600JAM350-118 10.588 3.331 3.331 99.720 99.720 100.837 12885 3889 3.017 40.744 40.744 3.017 40.527 10.588 75.265 75.265 69.743
800JAM250-43 6.368 1.225 1.225 36.664 36.664 32.254 1060 1060 0.572 9.679 4.983 0.409 8.238 6.378 29.006 29.006 24.861
800JAM250-54 7.949 1.700 1.700 50.893 50.893 44.463 2102 2102 0.710 12.044 7.286 0.560 10.645 7.949 36.991 36.991 33.939
800JAM250-68 9.923 2.260 2.260 67.676 67.676 61.309 4219 3368 0.883 15.007 10.671 0.763 13.763 9.923 53.065 53.065 46.207
800JAM250-97 13.893 3.409 3.409 113.945 113.945 98.919 10885 6032 1.225 20.919 18.725 1.187 20.155 13.893 77.866 77.866 68.632
800JAM250-118 16.707 4.177 4.177 142.242 142.242 125.055 16182 7301 1.464 25.073 25.017 1.464 24.681 16.707 95.609 95.609 82.536
800JAM350-68 11.749 2.406 2.406 72.028 72.028 65.370 4219 3368 1.990 25.049 18.170 1.681 22.600 12.092 51.562 51.562 50.106
800JAM350-97 16.927 3.711 3.711 111.105 111.105 107.517 10885 6032 2.782 35.121 31.925 2.645 33.415 17.065 87.651 87.651 80.787
800JAM350-118 20.553 4.855 4.855 145.369 145.369 140.775 16182 7301 3.341 42.281 42.281 3.337 41.240 20.553 109.593 109.593 101.536

Notes:

  1. Effective properties incorporate the strength increase from the cold-work of forming as applicable per AISI A7.2.
  2. Tabulated gross properties are based on the full-unreduced cross section of the studs, away from punchouts.
  3. Allowable moment is the lesser of Mal and Mad. Stud distortional buckling is based on an assumed kΦ = 0.
  4. For deflection calculations, use the effective moment of inertia.
  5. The effective moment of inertia for deflection is calculated at a stress which results in a section modulus such that the stress times the section modulus at that stress is equal to the allowable moment. AISI S100-07 Procedure I for serviceability determination has been used.
JamStud® Design Example
JamStud Design Example
 
1. Basis for Tables:
 
The JamStud® allowable heights tables on this site cover the following basic load combination for strength determination using the Allowable Stress Design (ASD) Method (IBC 2009/2012 and ASCE 7-05/10):
 
  • D + WC&C
  • D + 0.6WC&C

(ASCE 7-05)
(ASCE 7-10)

 
WC&C is the component & cladding wind load.  The Dead Load (D) acting on the stud is assumed minimum and therefore neglected in the tables.
 

For deflection determination IBC 2009 and IBC 2012-Sec. 1604.3 and AISI-S211-07 Wall Stud Design Standard Sec. A3.1 allow for a reduction factor of 0.7 on the component & cladding wind load (0.7WC&C).

 
The "JamStud® - Allowable Heights" tables are based on the following assumptions:
 
  • 4-Way distribution of lateral wind pressure acting on the opening
  • Opening height extends from floor level to the bottom surface of the header
  • Jamb member supports wind pressure from opening, wind pressure from half distance to adjacent stud, and header reaction
 
The input for the tables include:  the JamStud section, the opening width (ft.), the opening height (ft.), the design wind pressure (WC&C, psf), and the specified deflection limit.  The output from the tables reflects the allowable JamStud height (ft.-in.) and the controlling design factor, whether it is strength or deflection (“f” denotes strength, “d” denotes deflection).  An "*" denotes critical web crippling at support of jamb. The use of stiffening clips at supports typically eliminates the web crippling condition.
 
2. Design Example:
 

 

Given:

Wind Pressure (WC&C)(ASCE 7-05)
or (0.6WC&C)(ASCE 7-10)
Wall Width
Wall Height
Opening Width
Opening Height
Stud Spacing
Specified Deflection Limit
Typical Stud

 


= 30 psf
= 6.0 in.
= 14.0 ft.
= 8.0 ft.
= 10.0 ft.
= 16 in. o.c.
= L/360
600S162-43

 
Bridging (Lateral Bracing) is recommended at a vertical spacing of 60” o.c. with both JamStud flanges connected to the sheathing.
 
Design Jamb:
 
Go to the “JamStud – Allowable Heights” table with 6” stud member, 30 psf wind load, L/360 deflection limit, 8.0 ft. opening width, and 10.0 ft. opening height.  Possible JamStud selections from table for 14.0 ft. height are 600JAM250-97 (allowable height = 15’ 0”) and 600JAM350-68 (allowable height = 14’ 6”).  The alternative with typical 43mil “cee” studs result in a built-up section comprised of (3) 600S162-43 capped by (2) 600T162-43.
 
Conclusion:
 
The second option, 600JAM350-68, is a lighter section with a lesser thickness.  Use 600JAM350-68 (50ksi) (with design thickness = 0.0713” and Fy = 50 ksi).  Allow 2 rows of bridging for the wall (including jamb stud) arranged so that the maximum spacing does not exceed 60 in. (5 ft.).
 
3. Extra Design Considerations:
 
Strength determination in the “JamStud – Allowable Heights” tables includes checks for bending and shear capacity values of the stud and a check for lateral end reaction of the stud for web crippling. If tables indicate critical web crippling (denoted with an “*”), you may use a clip at the top and bottom ends of stud to eliminate the web crippling condition.

Design Comparison of Jamb Members

Design Comparison of Jamb Members

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