Abstract
The paper generalizes for creep the concept of the shear center for straight thin-walled beams of open cross section. It is shown that the shear center is replaced by the envelope of a family of straight lines —the torsion-free axes—such that when the plane of bending passes through such a straight line the cross section will suffer no torsion. A method is presented for the calculation of this envelope.Assuming that the stress-strain rate law is of the power type, it is shown that this envelope is a function of the exponent n of the power law. Since the value of n varies with the temperature, a change in the temperature requires a translation of the plane of loading in order to avoid torsion. Omission of this translation introduces additional shearing stress due to torsion of an order of magnitude equal to that of the shearing stress due to bending. The theory is applied to a semicircular cross section and the computations were made on an IBM 7094-7040 computer.
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