expression to calculate the twist angle of hollow-box beams under torsional loads
expression to calculate the twist angle of hollow-box beams under torsional loads
(OP)
Hello All,
I am doing some calculations, and I am calculating the torsional deflection of an internally reinforced rectangular section hollow-box beam. After looking at some websites and books, I have found that the twist angle is: T*L/(J*G), where
T is the torque
L is the length of the beam
J is the polar inertia moment
G is the Transversal Elasticity Modulus
However, I also found another expression:
(Mt*lt*L)/(4*G*A0^2*t)
where
Mt is the torsion moment
lt is the mean line perimeter
L is the length
A0 is the mean line area
t is the thickness
G is the Transversal Elasticity Modulus
Does anyone know the validity of each of these equations: Type of support, type of section. And what expression shall I use for a thin-walled, but reinforced beam of arbitrary section?
regards,
Miguel Silva, MSc.
I am doing some calculations, and I am calculating the torsional deflection of an internally reinforced rectangular section hollow-box beam. After looking at some websites and books, I have found that the twist angle is: T*L/(J*G), where
T is the torque
L is the length of the beam
J is the polar inertia moment
G is the Transversal Elasticity Modulus
However, I also found another expression:
(Mt*lt*L)/(4*G*A0^2*t)
where
Mt is the torsion moment
lt is the mean line perimeter
L is the length
A0 is the mean line area
t is the thickness
G is the Transversal Elasticity Modulus
Does anyone know the validity of each of these equations: Type of support, type of section. And what expression shall I use for a thin-walled, but reinforced beam of arbitrary section?
regards,
Miguel Silva, MSc.





RE: expression to calculate the twist angle of hollow-box beams under torsional loads
Quando Omni Flunkus Moritati
RE: expression to calculate the twist angle of hollow-box beams under torsional loads
RE: expression to calculate the twist angle of hollow-box beams under torsional loads
RE: expression to calculate the twist angle of hollow-box beams under torsional loads
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?