Strength of Permanent Metal Deck Forms Used to Brace Steel Bridge I-Girders

Abstract

Permanent metal deck forms (PMDF) are frequently used in the building and bridge industries as concrete deck formwork. PMDF are not currently relied upon as a bracing source for bridges due to eccentric connections that can dramatically reduce the stiffness of the deck system. However, previous studies have shown that the PMDF can provide substantial bracing against lateral torsional buckling to the bridge girders by making simple modifications to connection details. This paper presents the results of an ongoing analytical study on the PMDF strength requirements for steel bridge girders. In the past, simplified finite element analytical (FEA) models were used to investigate the global buckling behavior of the PMDF braced systems. This paper focuses on results of modified FEA models to determine the stability brace forces of fasteners used to connect the PMDF along the sidelaps of the sheets and also to the girders. The results will be used to develop strength requirements for the PMDF used in the bridge industry.