High ductile composite frame structures can represent a competitive solution in seismic-prone areas if they are endowed with efficient structural solutions. In detail, the introduction of dissipative partial-strength beam-to-column composite joints can lead to the formation of global mechanisms characterized by large inelastic rotations and therefore great amounts of dissipated energy. Monotonic and cyclic tests were conducted on subassemblies at the University of Pisa. The inelastic response of joints was divided mainly between shear yielding of the column web panel and inelastic bending of the extended end plate and column flange. Also yielding of the rebars and concrete crushing of the slab against the column flange took place. In order to guarantee a ductile behavior of partial-strength beam-to-column composite joints, it is needed a suitable capacity design of joint's mechanical components. Nonetheless, mechanical models of composite joints under seismic actions are not fully defined yet and many doubts still exist mainly with regard to strut and tie mechanisms in the reinforced concrete slab governing the force transfer between beam and column. In the paper, mechanical models of interior and exterior beam-to-column joints are presented on the basis of experimental results obtained in monotonic tests, through the analysis and modeling of each component part governing their structural behavior. A preliminary validation of the models is presented and discussed.
Component-based models of dissipative partial-strength beam-to-column composite joints
SALVATORE, WALTER
2006-01-01
Abstract
High ductile composite frame structures can represent a competitive solution in seismic-prone areas if they are endowed with efficient structural solutions. In detail, the introduction of dissipative partial-strength beam-to-column composite joints can lead to the formation of global mechanisms characterized by large inelastic rotations and therefore great amounts of dissipated energy. Monotonic and cyclic tests were conducted on subassemblies at the University of Pisa. The inelastic response of joints was divided mainly between shear yielding of the column web panel and inelastic bending of the extended end plate and column flange. Also yielding of the rebars and concrete crushing of the slab against the column flange took place. In order to guarantee a ductile behavior of partial-strength beam-to-column composite joints, it is needed a suitable capacity design of joint's mechanical components. Nonetheless, mechanical models of composite joints under seismic actions are not fully defined yet and many doubts still exist mainly with regard to strut and tie mechanisms in the reinforced concrete slab governing the force transfer between beam and column. In the paper, mechanical models of interior and exterior beam-to-column joints are presented on the basis of experimental results obtained in monotonic tests, through the analysis and modeling of each component part governing their structural behavior. A preliminary validation of the models is presented and discussed.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
