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## Main Question or Discussion Point

You have two parallel I-beams. A trolley with 4 wheels runs on top, and carries a total load of say 10kN. How would you evaluate the torsion?

angle theta = TL/GK

where (for an I beam) K = [2bt^3 + (d - 2t)(thickness of web)^3] / 3

and t = thickness of flange

But, how would you calculate the torque T?

Say if the beams were 1m apart, if torque was simply 10kN x 0.5m, then the beam would roll over.

For the equation; tau = T/Q

how do you calculate Q for an I beam?

angle theta = TL/GK

where (for an I beam) K = [2bt^3 + (d - 2t)(thickness of web)^3] / 3

and t = thickness of flange

But, how would you calculate the torque T?

Say if the beams were 1m apart, if torque was simply 10kN x 0.5m, then the beam would roll over.

For the equation; tau = T/Q

how do you calculate Q for an I beam?