A theory for evaluating the lateral stability of long prestressed concrete /-beams supported from below is developed. The same principles are also applied to hanging beams, extending the work presented earlier in Part 1 of this paper. The theory includes consideration of the post-cracking behavior of prestressed concrete beams under lateral loads. Data from the testing of a full-sized prestressed concrete beam are presented to verify the theory. A method of computing factors of safety related to lateral stability is presented. A numerical example is included, giving computations for the factors of safety for both hanging and bottom-supported beams. A computer program in BASIC is furnished to facilitate these computations.
