ACI presents hysteresis model for post-installed fasteners anchoring NSCs

The American Concrete Institute (ACI) has released a paper called Hysteresis Model for Concrete Anchors Subjected to Shear Loading.

This document presents a hysteresis model for post-installed fasteners anchoring nonstructural components (NSCs) to concrete structures, or structural concrete members to each other, such that they must resist seismic shear actions.

ACI says: “Focusing on NSCs, the hysteresis model was initially calibrated with quasi-static tests of an expansion anchor, and was implemented in the numerical model of a shake-table NSC assembly to predict its response.”

The initially calibrated model predicted the experimental acceleration response of the NSCs during two tests, with RMS errors of less than 10%, but overestimated the amplitude up to 50%. In addition, minor tuning of the model using the first test results reduced the RMS and amplitude errors for the second test to 5% to 15%.

“It was concluded that the developed anchor model constitutes a simple and powerful tool for numerically representing the hysteresis of anchor connections subjected to shear and evaluating the response of the NSCs they fix,” ACI adds.

This paper was written by Patricio Quintana Gallo, Masoud Moghaddasi, Stefano Pampanin, and Athol J. Carr.



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