Seismic CFST Column to Precast Cap Beam Connections for Accelerated Bridge Construction
AbstractConcrete filled steel tubes (CFSTs) frequently are a more efficient and economical structural solution then conventional reinforced concrete and structural steel. For the same size member, CFSTs offer increased strength and stiffness as well as accelerated construction. CFSTs may be used for bridge columns that will yield under earthquake loading, but this requires robust connections capable of sustaining large cyclic loads. To facilitate accelerated bridge construction, precast cap beams and girders are commonly used. Although CFST column to foundation connections have been studied, CFST column to precast cap beam connections have not. This is the focus of this research study. In contrast to cast in place (CIP) components, precast pier cap connections require additional design considerations including construction methodology and limits on geometry. To investigate this connection an integrated analytical and experimental research program was performed. Initially, continuum finite element methods