Evolution of the L-shaped spandrel beam

Abstract

N umerous PCI-sponsored research projects over the years have endeavored to improve the design of precast concrete components. One such component is the beam with an integral ledge.Beams with ledges may be inverted-T shaped or L shaped. This Research Corner will describe research funded by PCI pertaining to the L-shaped beam, also called an L beam. The PCI-funded research had a profound impact on the evolution of design procedures for such beams. [1][2][3] L beams are typically placed at the perimeter of a precast concrete structure and support double-tee-beam floor components. As used in parking structures, the web of the L often extends above the floor surface to function also as a barrier wall. Such beams are often referred to as deep or slender spandrels. The beams may be prestressed or mild reinforced. Both styles are common.