Special Report Lateral Stability of Long Prestressed Concrete Beams Part 1 by Robert F. Mast Chairman of the Board ABAM Engineers A Member of the Berger Group Federal Way. Washington A s the span of prestressed concrete beams has been growing over the years, lateral stability during handling and shipping has become increasingly important. Many designers only con- sider lateral stability of the finished structure, which is seldom a problem once the beam is integrated with a floor or deck. The problems of stability dur- ing construction are left to the fabrica- tors and contractors. The lateral buckling formulas in most textbooks are not adequate to deal with the special cases of a beam suspended on cables or a beam on "springy" sup- ports. This paper deals with these spe- cial cases and provides the background and derivations of the proposed formulas. The material is prepared in two parts. Part 1 deals with the lateral bending stability of beams when suspended from lifting loops. This method was first de- veloped by the author in 1963 and was the basis of the PCI Design Handbook' provisions for lateral stability during Iifting, although it appears in modified form in the Handbook. Part 2 extends the analysis of lateral bending stability to the more general case of beams whose supports provide elastic restraint to rolling. This includes beams supported on elastomeric pads and on trucks and trailers, and includes the effects of superelevation. 34
Lateral Stability of Long Prestressed Concrete Beams
May 16, 2023
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