MT 2.5 Tech Supplement Guide
1.0 MT PROFILES 1.2 . MT BEAM AND COLUMN LOAD TABLES
Table 37 . MT Beam Load Reduction Factors for Laterally Unbraced Channels 1 , 2 , 3 , 4
Span in ( cm )
MT-30D MT-40D MT-50 U MT-50D MT-50D U x-axis y-axis x-axis y-axis x-axis y-axis x-axis y-axis x-axis y-axis 24 ( 51.0 ) 1.000 0.974 1.000 1.000 0.991 1.000 1.000 1.000 1.000 1.000 36 ( 91.4 ) 1.000 0.974 1.000 1.000 0.901 1.000 1.000 1.000 1.000 1.000 48 ( 121.9 ) 1.000 0.900 0.964 1.000 0.823 0.978 0.980 1.000 0.982 1.000 60 ( 152.4 ) 0.966 0.824 0.901 0.988 0.760 0.912 0.932 1.000 0.935 0.998 72 ( 182.9 ) 0.929 0.749 0.835 0.947 0.708 0.882 0.883 0.971 0.888 0.968 84 ( 213.3 ) 0.892 0.675 0.768 0.906 0.664 0.834 0.836 0.940 0.842 0.938 96 ( 243.8 ) 0.855 0.601 0.700 0.864 0.625 0.787 0.788 0.909 0.796 0.908 108 ( 274.3 ) 0.819 0.530 0.633 0.822 0.589 0.740 0.741 0.879 0.750 0.879 120 ( 304.8 ) 0.783 0.472 0.565 0.781 0.556 0.693 0.695 0.849 0.705 0.832 144 ( 365.8 ) 0.712 0.388 0.454 0.699 0.499 0.601 0.602 0.789 0.615 0.793 168 ( 426.7 ) 0.642 0.330 0.380 0.617 0.455 0.513 0.514 0.731 0.528 0.735 192 ( 487.7 ) 0.572 0.287 0.328 0.538 0.418 0.446 0.446 0.672 0.458 0.679
216 ( 548.6 ) 0.506 0.254 0.288 0.473 0.387 0.394 0.395 0.613 0.405 0.622 240 ( 609.6 ) 0.454 0.229 0.257 0.422 0.361 0.353 0.354 0.555 0.364 0.566
1 Linear interpolation is not permitted . 2 Reduction factors in table are based on loading through the shear center of the cross section . The impact of torsion is not accounted for in these values . 3 Reduction factors are to be applied to the tabulated beam load values for fully braced spans . Additional modification factors based on loading and support conditions may apply per Table 6 . 4 Tabulated values conservatively assume a value for the lateral torsional-buckling modification factor , C b , of 1.0 .
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