Shear behaviour of adhesive anchors under different strain rates: Fid-Bau Portal

Shear behaviour of adhesive anchors under different strain rates

Ahmed, Lenda T. / Braimah, Abass

Highlights • The increase in the strain rate increased the shear load and DIF. • Failure mode transitioned from pryout failure at low strain rate to steel failure at high strain rate. • Anchor design parameters have an influence on failure mode at low strain rate. • Level of damage increased with the increase in anchor diameter. • Exposure to high strain rate conditions can result in a catastrophic anchorage failure.

Abstract Finite element analysis was carried out to investigate the shear behaviour of post-installed adhesive anchors at strain rates ranging from 10^-5 s⁻¹ to 10³ s⁻¹. The shear capacity and the corresponding dynamic increase factor (DIF) at the different strain rates ( $\dot{ε})$ and for different design parameters were investigated. Failure mode of the adhesive anchor was also examined. The results show that the shear capacity and DIF of the adhesive anchors increased with increase in the strain rate. Anchor diameter and embedment depth were observed to influence the shear capacity of the adhesive anchor. The failure mode was influenced by the strain rate wherein the increase in the strain rate from 10^-5 s⁻¹ to 10³ s⁻¹ resulted in failure mode transition from pryout failure to concrete spalling, and then to steel anchor fracture failure.