Performance of Post-Installed Anchors in a Progressively Damaged Concrete Shear Wall

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Title: Performance of Post-Installed Anchors in a Progressively Damaged Concrete Shear Wall

Author(s): Gloria Faraone, Tara C. Hutchinson, Roberto Piccinin, and John Silva

Publication: Structural Journal

Volume: 116

Issue: 6

Appears on pages(s): 293-306

Keywords: anchor testing; concrete anchorage; concrete anchors; crack pattern; crack width; reinforced concrete shear wall

Date: 11/1/2019

Abstract:
Post-installed anchors connect various components to concrete members, which undergo cyclic cracking during a seismic event. In recognition of this, current guidelines to qualify anchors for seismic applications require adequate performance in cracked concrete without substantial load loss. The interaction between anchors and pure flexural cracks has been studied for decades; however, the response of anchors to shear and x-type (crossing) cracks—that is, the complex situation realized in shear-flexure structural components—has been neglected. Hence, the behavior of expansion and bonded anchors installed horizontally in a slender full-scale reinforced concrete shear wall was investigated, while the wall, whose response is described in a companion paper, was subjected to cyclic lateral loading. Results confirm the sensitivity of the performance of expansion anchors amidst the presence of a variety of cracked concrete conditions. Nonetheless, both bonded and expansion anchors demonstrate sufficient residual axial load capacity and post-peak strength during pullout tests to failure.