USNRC (United States Nuclear Regulatory Commission) Anchor Bolt Study Data Survey and Dynamic Testing.

摘要

A survey was performed to determine the adequacy of existing concrete expansion anchor test data. Based upon the survey findings, additional dynamic testing to assess the benefits of preload was undertaken. Exploratory testing was performed on typical wedge and shell anchors. It was found that, providing the installation torque is properly applied, residual preload does not significantly affect anchor load-displacement characteristics until the preload drops to less than 50% of the full installation preload. It was concluded that this must be considered in design situations where support stiffness is an important factor.