Research is presented on describing the deflection behavior of prismatic beams with high aspect ratio rectangular cross-sections undergoing lateral torsional buckling. The 3-D large deflection path of buckling beam tips was closely approximated by circular arcs in two planes. When deflection paths of beams with different geometric and material properties were nondimensionalized with respect to the beam length, these deflection paths were the same with very little variation. Similarly, the change in the beam tip orientation as the beams deflected also remained the same as geometry and material properties were varied.

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