MODELLING OF A PARTIAL-STRENGTH BEAM-TO-COLUMN JOINTFOR HIGH DUCTILE STEEL-CONCRETE COMPOSITE MR FRAMES

摘要

The paper describes the behaviour and component modelling of partial strength beam-to-column jointsused in high ductile steel-concrete composite moment-resisting frame structures. The joint performancewas determined via quasi-cyclic and monotonic tests conducted on subassemblages at the University ofPisa and a series of pseudo-dynamic tests executed on a full-scale two-storey frame structure specimen atthe European Laboratory for Structural Assessment (ELSA) of the Joint Research Centre (JRC). The jointsanalysed are composed of extended end-plate connections whose inelastic response is divided mainlybetween shear yielding of the column web panel and inelastic bending of the extended end plate andcolumn flange. Also yielding of the slab reinforcements and concrete crushing against the face of thecolumns took place during testing. Analytical models of internal joints were developed on the basis ofexperimental results and formulae on subassemblages. In detail, experimental laws governing the responseof joint components were obtained by using only equilibrium and kinematic considerations to processexperimental data. Results obtained permitted existing laws to be validated, some of which with currentEuropean standards.