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عمران::
محور مرکز سطح
centroidal axis, the level of a prestressing duct, or at the intersection of the flange (if any) and
duct and bw at points remote from the duct, and Q is the first moment about the centroidal axis
The distance of the parabolic prestressing cable below the centroidal axis of the section at x m
centroidal axis and at the tendon level.
At the centroidal axis, the first moment of the area below the centroidal axis is
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