Joists with Taper Flanges

Taper Flange I-Beams

I-beams, as the name states are manufactured in the shape of a capital “I”. The core of the I-beam, better known as the web, will ensure that resistance against shear forces is provided. Except for the web, the I-beam also consist of flanges, taper or parallel flange, on either side of the web and at both ends. The flanges provide resistance to bending moments.

In the construction industry I-beams are used as cross sections providing strength to girders, it also provides support to joists which in turn support ceilings and/or floors. They are also widely used in the construction industry as a support for buildings to ensure that the structure is strong enough. Even though I-beams can resist bending, it should preferably not be used in cases where torque forces are present along the axis or length of the beam as they are not torsion resistant.

I-beams can also be used as tracks for trolley wheels and lift supporting frames as well as trailer and truck bedding frames.

The size of I-beams are determined by the weight it should be able to support and will differ from application to application and structure to structure.

Designation Mass per metre
M kg/m
Depth of section
h mm
Width of section
b mm
Thickness of Web
s mm
Thickness of Flange
t mm
Root radius
r 1 mm
Toe radius
r2
Flange Taper α Depth between fillets
d mm
Second Moment of
area Axis x-x Ix cm4
Second Moment of
area Axis y-y Iy cm4
Radius of Gyration
Axis x-x rx cm
Radius of Gyration
Axis y-y ry cm
Elastic Modulus
Axis x-x Zx cm3
Elastic Modulus
Axis y-y Zy cm3
Plastic Modulus
Axis x-x Sx cm3
Plastic Modulus
Axis y-y Sy cm3
Buckling Parameter u Torsional Index x Warping Constant
H dm6
Torsional Constant
Inertia J cm4
Area of section
A cm4
Designation Mass per metre
M kg/m
Depth of section
h mm
Width of section
b mm
Thickness of Web
s mm
Thickness of Flange
t mm
Root radius
r 1 mm
Toe radius
r2
Flange Taper α Depth between fillets
d mm
Second Moment of
area Axis x-x Ix cm4
Second Moment of
area Axis y-y Iy cm4
Radius of Gyration
Axis x-x rx cm
Radius of Gyration
Axis y-y ry cm
Elastic Modulus
Axis x-x Zx cm3
Elastic Modulus
Axis y-y Zy cm3
Plastic Modulus
Axis x-x Sx cm3
Plastic Modulus
Axis y-y Sy cm3
Buckling Parameter u Torsional Index x Warping Constant
H dm6
Torsional Constant
Inertia J cm4
Area of section
A cm4
254x203x82 82 254 203.2 10.2 19.9 19.6 9.7 8 166.6 12025 2280 10.7 4.67 947 224 1077 371 0.89 11 0.312 152 105
254x114x37 37.1 254 114.3 7.6 12.8 12.4 6.1 8 199.3 5082 269 10.4 2.39 400 47.1 459 79.1 0.885 18.7 0.0391 25.2 47.3
203x152x52 52.2 203.2 152.4 8.9 16.5 15.5 7.6 8 133.2 4798 816 8.49 3.5 472 107 541 176 0.891 10.7 0.0711 64.9 66.6
152x127x37 37.2 152.4 127 10.4 13.2 13.5 6.6 8 94.3 1818 378 6.19 2.82 239 59.6 279 99.8 0.866 9.32 0.0183 33.9 47.5
127x114x29 29.3 127 114.3 10.2 11.5 9.9 4.8 8 79.5 979 242 5.12 2.54 154 42.3 181 70.8 0.853 8.76 0.00807 20.8 37.4
127x114x27 26.8 127 114.3 7.4 11.4 9.9 5 8 79.5 946 236 5.26 2.63 149 41.3 172 68.2 0.868 9.31 0.00788 16.9 34.2
127x76x16 16.5 127 76.2 5.6 9.6 9.4 4.6 8 86.5 571 60.8 5.21 1.7 90 16 104 26.4 0.891 11.8 0.00209 6.73 21.1
114x114x27 27 114.3 114.3 9.5 10.7 14.2 3.2 8 60.8 736 224 4.62 2.55 129 39.2 151 65.8 0.841 7.92 0.00601 18.9 34.5
102x102x23 23 101.6 101.6 9.5 10.3 11.1 3.2 8 55.2 486 154 4.07 2.29 95.6 30.3 113 50.6 0.836 7.42 0.00321 14.2 29.3
102x44x7 7.4 101.6 44.5 4.3 6.1 6.9 3.3 8 74.6 153 7.82 4.01 0.907 30.1 3.51 35.4 6.03 0.872 14.9 0.000178 1.26 9.5
89x89x19 19.5 88.9 88.9 9.5 9.9 11.1 3.2 8 44.2 307 101 3.51 2.02 69 22.8 82.7 38 0.83 6.57 0.00158 11.5 24.9
76x76x15 15 76.2 80 8.9 8.4 9.4 4.6 8 38.1 172 60.9 3 1.78 45.2 15.2 54.2 25.8 0.82 6.42 0.0007 6.84 19.1
76x76x13 12.7 76.2 76.2 5.1 8.4 9.4 4.6 8 38.1 158 51.8 3.12 1.79 41.5 13.6 48.7 22.4 0.852 7.21 0.000595 4.6 16.2
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