Concrete-Filled Steel Tube to Concrete Pile Cap Connections
The Montana Department of Transportation has found concrete-filled steel tube (CFT) piles connected at the top by a concrete pile cap to be a very cost-effective support system for short and medium span bridges. This type of system offers low initial cost, short construction time, low maintenance requirements, and a long service life. While the gravity load performance of these systems is well understood, their strength and ductility under extreme lateral loads (e.g., seismic events) is more difficult to reliably predict using conventional design procedures. The proposed research aims to further develop newly established design and analysis methodologies, and to ultimately ensure the desired bridge performance.
Phase I: Preliminary Investigation
Phase II: Lateral Load and Lateral Displacement
Phase III: Confirmation of Connection Performance
- Final Report
- Project Summary Report
- Performance Measures Report
Kappas, L. (2018). Performance and Design of Steel Pipe Pile to Concrete Cap Connections Subject to Seismic or High Transverse Loading
- "A design aide was developed in Excel to assist with the proposed algorithm and calculations of subsequent internal connection forces between the embedded steel pile and the concrete pile cap, as described in portions of the provided dissertation. This design aide may be useful to assist with design of a pile-to-pile cap connection if used appropriately. The design aide’s results are based on the experimental findings of the research and would require verification for other specific applications. Additional work is ongoing to verify the design of these connections and design aide. Please contact Lenci Kappes at firstname.lastname@example.org, or 406-444-6932, with questions about this design aide and accompanying information."
- 2016 TRB Annual Meeting Poster
Phase IV: Further Evaluation and improvement of Analysis and Design
The primary objective of this project is to further validate/improve MDT's CFT to concrete pile cap connection design/analysis methodologies, and to ensure the efficacy of these methodologies for a wide variety of potential design configurations. This research will include physical tests of scaled specimens, which may include specimens with variations in cap dimensions, CFT diameter, or number of embedded piles. Additionally, the use of battered piles or precast concrete pile caps in this system may be explored experimentally. The exact scope of this project will be further developed through collaboration with the technical panel at the next stage of the proposal.
Please contact , 406-444-7693 for more information.