-
(i−1)
I, (i−1)
J, (i)
I and (i)
J are the coordinates of the nodes at the last (i − 1)th and the current (i)th configurations, respectively
-
(i−1)yk is web plan vector of the element at the last configuration, perpendicular to the member axis
- φk is the rotation of the element about its axis (Table 6)
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\({}^{(i - 1)}\bar{y}_{k}\) is the position of (i-1)yk after performing the rotation φk
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\({}^{(i)}\bar{y}_{k}\) is a web plan vector of the member at the current configuration, parallel to \({}^{(i - 1)}\bar{y}_{k}\)
-
\({}^{(i)}y_{k}\) is the web plan vector of the current configuration that is \({}^{(i)}\bar{y}_{k}\) after normalizing (still in the web plan but perpendicular to the member axial axis)