Title:
Numerical Analysis of Quadruple Fastenings with
Bonded Anchors
Author(s):
Yijun Li, Rolf Eligehausen, Josko Oubolt, and Bernhardt Lehr
Publication:
Structural Journal
Volume:
99
Issue:
2
Appears on pages(s):
149-156
Keywords:
anchors; bond; concrete.
DOI:
10.14359/11537
Date:
3/1/2002
Abstract:
This paper addresses the failure mechanism and the failure load of quadruple fastenings with bonded anchors. The studied specimens were adhesive anchors anchored in a concrete block and subjected to tensile loading. Numerical analysis was performed using a microplane model with relaxed kinematic constraint to simulate the concrete material, and a special interface model to represent the adhesive material. Two typical experiments with different failure modes were simulated. Calculated load-displacement curves and failure modes agree well with experimental data. Furthermore, an extensive parameter study was performed by varying the embedment depth hef (hef = 4d to 20d), spacing between anchors (s = 0.25hef to 2.5hef), and anchor diameter (d = 8, 12, and 20 mm). These studies reveal the failure mechanism of bonded anchor groups and clarify the group effect on the failure load. Based on the numerical and experimental results, a model for evaluating the failure load of quadruple fastenings with bonded anchors is proposed.