POU_D_TG is the same as POU_D_T. In addition the warping of the section is taken into account, this can be useful in non-linear calculation when an important warping is expected. This is described in U3.11.04. However, if the warping influence is taken into account, i.e. the deformed shape of the structure is correct and the SIEF_ * are properly calculated, the calculated SIPO and SIPO do not take into account the warping re- strain influence 1 . This has to be hand calculated from the DEPL...GRX and SIPO_ELNO...BX components, more information in R3.08.04 and [Roark], precisely in TABLE 21 & 22.
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