Ben Worsfold - Column Foundation Moment Connections with Headed Anchors
Автор: Auckland Structural Group
Загружено: 2020-04-16
Просмотров: 579
Описание:
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.
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