Seismic behavior of embedded rubberized concrete-filled corrugated steel tube column-to-foundation connections: Experimental, numerical modelling, and design

Abstract

A rubberized-concrete-filled corrugated steel tube composite column-foundation connection is proposed as a solution to mitigate local buckling, bulging, or tearing damage of concrete-filled steel tube columns during seismic load. This proposal aims to improve the ductility and energy dissipation capacity of the column. Experimental studies have been conducted to investigate the axial compressive strength of this novel column and the side shear performance of its connection to the foundation. A quasi-static experiment was carried out on three specimens to facilitate the application of the proposed connection. The influence of embedded depth on the seismic strength of such composite column-foundation connection was studied, and the cast-in-place specimen was used as a reference. The failure modes of the specimens were observed, and the evaluation indicators such as strength, stiffness, and ductility were analyzed. The results show that the connection of the composite column foundation can provide sufficient connection strength under seismic load. Furthermore, seismic design methods are explored and proposed, combined with the side shear database. These investigations aim to inform the design and application of such column-foundation connections.