ANGLE IRONS


Hot Formed Unequal Leg


There are many advantages to constructing with steel: the strength to weight ratio is excellent; metals join easily; efficient shapes are available; etc. These advantages create challenges that are best solved by a good understanding of how the metals actually perform in a structure. Structural steel shapes are suitable for a wide variety of uses. For example they are used in, building frames, roof trusses, floor framing, bench frames, gates, fences, cattle grids, scaffolds, tank stands, television towers, car trailers, rails, etc.

Most structural steel failures occur at connections, where a beam connects to a column, where a joist connects to a beam, etc. The Structural Engineer must design the steel members and give guidelines for the connections. The cold-formed sections are suitable for all types of welding such as spot welding, seam welding, projection welding, butt and groove welding, plug welding and arc welding. All of these are applicable to both uncoated and zinc coated sections.

Different shapes of structural steel (both hot-rolled and cold-formed) are available with specifications such as: I-beam’s, Z-Shape (half a flange in opposite directions), HSS-Shape (Hollow structural section such as square, rectangular, circular (pipe) and elliptical cross-sections), Equal angle, L-shaped cross-section, Channel ( [-shaped), Tee (T-shaped cross-sections), Rail profile (asymmetrical I-beam), Flanged T-rail, Bar (a piece of metal flat and long), Plate (metal sheets thicker than 6 mm or 1⁄4 in), Open web steel joist.

Some structural steel shapes such as I-beams have a high second moments of area, which can result in stiffness compared to cross-sectional area. It is very important for engineers to have understanding of the material and its limitations.

angels_unequal_leg_.png

Angles (unequal leg) dimensions and properties
   m  r1  r2  A  ax  ay  v1  v2  u1 u2 α
 Designation 
 hxbxt
 kg/m           mm         mm          10^3mm^2  mm         mm         mm        mm        mm       mm       deg      
 65x50x6  5.16  6  3  0.658  20.4  12.9  21.4  23.9  45.2  36.1  29.9
 8  6.75  6  3  0.860  21.1  13.7  22.4  23.9  44.9  36.3  29.7
 75x50x6  5.65  7  3.5  0.719  24.4  12.1  20.8  26.4  51.2  37.5  23.5
 8  7.39  7  3.5  0.941  25.2  12.9  21.8  26.2  50.8  37.8  23.3
 80x60x6  6.37  8  4  0.811  24.7  14.8  24.7  29.2  55.7  43.3  28.7
 8  8.34  8  4  1.06  25.5  15.6  25.9  29.2  55.3  43.6  28.6
 90x65x6  7.07  8  4  0.901  27.9  15.6  26.6  32.7  62.4  47.3  27.0
 8  9.29  8  4  1.18  28.8  16.4  27.7  32.6  62.0  47.6  26.9
 10  11.4  8  4  1.46  29.6  17.2  28.6  32.6  61.7  47.9  26.7
 100x65x8  9.94  10  5  1.27  32.7  15.5  26.9  34.7  68.1  49.2  22.5
 10  12.3  10  5  1.54  33.6  16.3  27.9  34.5  67.6  49.5  22.3
 100x75x6  8.04  10  5  1.02  30.1  17.9  30.1  36.7  69.9  53.9  28.7
 8  10.6  10  5  1.35  31.0  18.7  31.3  36.5  69.5  54.2  28.7
 10  13.0  10  5  1.66  31.9  19.5  32.4  36.5  69.2  54.5  28.6
 12  15.4  10  5  1.97  32.7  20.3  33.4  36.5  68.9  74.7  28.4
 125x75x8  12.2  11  5.5  1.55  41.4  16.8  29.8  42.0  84.4  58.6  19.8
 10  15.0  11  5.5  1.91  42.3  17.6  30.8  41.7  83.8  59.1  19.7
 12  17.8  11  5.5  2.27  43.1  18.4  31.7  41.5  83.3  59.5  19.5
 150x75x10  17.0  11  5.5  2.16  53.2  16.1  29.1  44.8  97.7  56.3  14.6
 12  20.2  11  5.5  2.57  54.1  16.9  29.9  44.5  97.1  66.9  14.5
 15  24.8  11  5.5  3.16  55.3  18.1  31.1  44.1  96.2  67.6  14.2
 150x90x10  18.2  12  6  2.32  50.0  20.4  36.1  50.3  101  70.6  19.8
 12  21.6  12  6  2.75  50.8  21.2  37.1  50.0  100  71.1  19.7
 15  26.6  12  6  3.39  52.1  22.3  38.4  48.8  99.8  71.6  19.5

   

Angles (unequal leg) dimensions and properties (continued)
   I  Ze  r  I  Ze  r  J
 Designation
 h*b*t
 10^6mm^4  10^3mm^3  mm  10^6mm^4  10^3mm^3  mm  10^3mm^4
                          About x-x                          About y-y  
 65x50x6  0.272  6.10  20.3  0.140  3.77  14.6  8.44
 8  0.348  7.93  20.1  0.177  4.89  14.4  19.1
 75x50x6  0.405  8.01  23.7  0.144  3.81  14.2  9.42
 8  0.520  10.4  23.5  0.184  4.95  14.0  21.3
 80x60x6  0.514  9.29  25.2  0.248  5.49  17.5  10.8
 8  0.663  12.2  25.0  0.318  7.16  17.3  24.4
 90x65x6  0.734  11.8  28.5  0.323  6.53  18.9  11.9
 8  0.949  15.5  28.3  0.415  8.54  18.7  26.9
 10  1.15  19.0  28.1  0.499  10.4  18.5  50.9
 100x65x8  1.27  18.9  31.6  0.422  8.54  18.3  29.9
 10  1.54  23.2  31.4  0.510  10.5  18.1  56.2
 100x75x6  1.02  14.7  31.6  0.495  8.67  22.0  14.1
 8  1.33  19.3  31.4  0.641  11.4  21.8  31.6
 10  1.62  23.8  31.2  0.776  14.0  21.6  59.5
 12  1.89  28.0  31.0  0.902  16.5  21.4  99.8
 125x75x8  2.47  29.6  40.0  0.676  11.6  20.9  36.7
 10  3.02  36.5  39.7  0.821  14.3  20.7  69.0
 12  3.54  43.2  39.5  0.955  16.9  20.5  116
 150x75x10  5.01  51.8  48.1  0.858  14.6  19.9  77.4
 12  5.89  61.4  47.9  0.999  17.2  19.7  130
 15  7.13  75.3  47.5  1.20  21.0  19.4  246
 150x90x10  5.33  53.3  48.0  1.46  21.0  25.1  83.6
 12  6.27  63.3  47.7  1.71  24.8  24.9  141
 15  7.61  77.7  47.4  2.05  30.4  24.6  266
                                                        About u-u                         About v-v   
 65x50x6  0.338  7.48  22.7               0.074  3.11  10.6               8.44
 8  0.430  9.57  22.4  0.096  3.99  10.5  19.1
 75x50x6  0.466  9.10  25.5  0.084  3.17  10.8  9.42
 8  0.596  11.7  25.2  0.108  4.10  10.7  21.3
 80x60x6  0.628  11.3  27.8  0.134  4.58  12.9  10.8
 8  0.808  14.6  27.6  0.173  5.91  12.7  24.4
 90x65x6  0.879  14.1  31.2  0.178  5.44  14.1  11.9
 8  1.13  18.3  31.0  0.230  7.05  13.9  26.9
 10  1.37  22.2  30.7  0.279  8.58  13.8  50.9
 100x65x8  1.44  21.2  33.7  0.248  7.14  14.0  29.9
 10  1.75  25.9  33.5  0.302  8.73  13.9  56.2
 100x75x6  1.25  17.9  34.9  0.268  7.29  16.2  14.1
 8  1.62  23.4  34.7  0.346  9.48  16.0  31.6
 10  1.97  28.5  34.5  0.422  11.6  15.9  59.5
 12  2.30  33.3  34.2  0.495  13.5  15.9  99.8
 125x75x8  2.74  32.5  42.1  0.409  9.75  16.3  36.7
 10  3.34  39.9  41.8  0.499  12.0  16.1  69.0
 12  3.91  46.9  41.5  0.585  14.1  16.1  116
 150x75x10  5.32  54.4  49.6  0.553  12.3  16.0  77.4
 12  6.24  64.2  49.3  0.649  14.6  15.9  130
 15  7.54  78.4  48.8  0.788  17.9  15.8  246
 150x90x10  5.91  58.5  50.5  0.883  17.5  19.5  83.6
 12  6.94  69.1  50.2  1.04  20.7  19.4  141
 15  8.41  84.2  49.8  1.26  25.3  19.3  266