WEBINAR: Column-Foundation Moment Connections with Headed Anchors: Experimental Tests and Analytical Simulations

Presentation

When – 5:30pm – Thurdsay 16 April 2020 //

Where – Teams meeting
Invites will be sent to registered ASG members at 12pm on the day of the event

Agenda – 17:30 presentation

Please register for this presentation below:

Abstract

Steel and precast columns are commonly designed to transfer moment loads to concrete foundations through cast-in-place headed anchors. In the United States, three different design methods have been used to design these connections:
1. Anchoring-to-concrete provisions (e.g., ACI 318-14 Chapter 17);
2. The strut-and-tie method (e.g., ACI 318-14 Chapter 23); and
3. Joint shear design methods (e.g., ACI 352R-02).
For any given connection, the strengths calculated with these three methods can differ by a wide margin. A laboratory test was performed to provide benchmark physical data to determine the applicability of the three aforementioned design methods. Analytical finite element models were calibrated with experimental data and sensitivity studies were performed. Both the experimental and analytical results suggest that the concrete breakout failure mode may govern column-foundation connections. The anchoring-to-concrete provisions from the US concrete building code (ACI 318-14 Chapter 17) are a conservative method for determining the strength of this failure mode. Current proposals for reducing conservatism will be discussed. This seminar will focus on the implications for design practice.

Biography

Benjamin L. Worsfold, is UC Berkeley’s current T.Y. Lin Fellow (2018-present). He completed his undergraduate degree in Civil Engineering at the University of Costa Rica in 2015 and worked for two years at a local design firm. He is currently a fourth year PhD student at UC Berkeley working with Dr. Jack P. Moehle in the Structural Engineering, Mechanics, and Materials department. His research focuses on the analytical and experimental behavior of cast-in-place headed anchors and headed rebar in reinforced concrete structures. Other interests include numerical analysis and finite elements analysis.