Experimental Study on Encased Concrete Filled Steel Tubes Connections for Accelerated Bridge Construction Applications

Concrete filled tubes (CFT) consist of concrete encapsulated by an external steel tube which provides constructional advantages and improved structural performance. CFTs have been widely used in columns of high-rise and industrial buildings but their application for bridge substructures have been limited due to lack of details. In this paper, a new CFT to footing connection is proposed which uses superior mechanical properties of ultra-high performance concrete (UHPC). The proposed connection detail consists of anchor dowels and shear connectors welded to the steel tube in the connection region for force transfer. An experimental study was carried out on a partially embedded, encased and fully embedded connection detail under axial and lateral cyclic load. The paper presents the failure modes, load drift and strain response at critical sections. The failure mode of partially and fully embedded layer was ductile tearing of the tube while connector pull out was observed for the encased detail. The results show that encasement requirement for fully embedded connection can be reduced while achieving the desired failure mode. For all connections, the capacity protected concrete footing remained elastic. The proposed connection detail provides an alternative connection which is feasible for accelerated bridge construction applications.


  • English

Media Info

  • Media Type: Digital/other
  • Features: Figures; Photos; References; Tables;
  • Pagination: 13p

Subject/Index Terms

Filing Info

  • Accession Number: 01881691
  • Record Type: Publication
  • Report/Paper Numbers: TRBAM-23-04913
  • Files: TRIS, TRB, ATRI
  • Created Date: May 1 2023 10:50AM