Experimental Characterization of a Composite Slab Subjected to Simulated Column Removal Loading

Abstract

Steel gravity frames are inherently simple systems, which has led to questions regarding their structural integrity or robustness. The concept of structural integrity is often tied to column removal scenarios in which the structure must develop alternate load paths. The mobilization of the composite slab with ribbed metal decking as a part of this behavior, theorized to be via membrane action, shifts the loading in the slab from bending to primarily tension. This study consists of composite slab component tests that include uniaxial tests in both orthogonal directions with respect to the deck corrugations, and shear and tension tests of the side lap splices. Also included are transverse uniaxial slab tests with additional reinforcement, and tension tests of the support fastener connections between the metal deck and beams and girders. The test results show the composite slab to be weak in the transverse direction regardless of side lap engagement and strong but susceptible to debonding in the longitudinal direction. They also cast doubt on the ability of the support fasteners to develop the longitudinal strength.