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Title: Cyclic Tests and Modeling of Stretch Length Anchor Bolt Assemblies for Dry Storage Casks

Author(s): Joel E. Parks, Chris P. Pantelides, Luis Ibarra, and David H. Sanders

Publication: Structural Journal

Volume: 117

Issue: 6

Appears on pages(s): 225-236

Keywords: anchor bolt; concrete anchor; cyclic tests; ductility; seismic; shear; stretch length; tension

Date: 11/1/2020

Abstract:
In recent experiments, individual stretch length anchors were found to improve the tensile displacement capacity of conventional anchors under simultaneous cyclic tension and shear. Two quasistatic cyclic experiments were conducted on a 1:2.5 scale model of a dry storage cask (DSC) connected to the foundation using stretch length anchors with an eight-bar diameter (8db) stretch length. The cask was modeled using a circular steel cylinder. In the first experiment, the cask was grouted to the anchorage ring resulting in non-composite action between the cask and the “free-ring”; in the second experiment, the anchorage ring was welded to the DSC, resulting in composite action of the cask and “fixed-ring”. Both test configurations prevented horizontal sliding and toppling of the DSC. The free-ring configuration dissipated significantly more hysteretic energy compared to the fixed ring; however, this was accompanied by vertical movement of the cask. A model for individual stretch length anchors is proposed and is used to simulate the cyclic tests using finite element analysis with acceptable accuracy.


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Electronic Structural Journal



  

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