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■ This paper summarizes the results of an analytical research program undertaken to develop a rational design procedure for precast concrete slender spandrel beams.■ The analytical and rational models use test results and research findings of an extensive experimental program presented in a companion paper.■ The overall research effort demonstrated the validity of using open web reinforcement in precast concrete slender spandrel beams and proposed a simplified procedure for design.

The use of open web reinforcement for torsion and shear reinforcement in slender spandrel beams has been suggested by the precast concrete industry as an alternative to the traditional closed stirrups mandated by ACI 318-08. Investigations of slender precast spandrel beams by Raths (1984), Klein (1986), Logan (2007), and others have indicated that such closed stirrups may not be necessary for these slender, non-compact sections. The proposal of eliminating closed stirrups is very appealing to the precast industry because closed stirrups tend to significantly increase production costs. This report documents an extensive experimental and analytical research program sponsored by the Precast Prestressed Concrete Institute and conducted at North Carolina State University. The objective of the research was to develop a rational design procedure for precast slender spandrel beams. Specifically, the research aimed to simplify the detailing requirements for the end regions of precast slender spandrel beams. Such regions are often congested with heavy reinforcing cages when designed with current procedures.

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