2019 CSCE Annual Conference - Laval (Greater Montreal) Conference
Dr. Abass Braimah, Carleton University
The demand for more flexibility in planning, design, construction and strengthening of concrete structures has resulted in the increased use of metallic anchoring systems. The use of Post-Installed Anchors as opposed to Cast In-Place anchors has added benefits of installation on cured concrete at any moment after the concrete has achieved its strength. In the design of structures against dynamic and impulsive loads such as blast loads, anchors are used to secure window frames to main building components such as beams, columns and walls as well as attaching mechanical anti-shatter films to window frames. In all these applications, design criteria would not be limited to ensuring adequate strength of the building components, frames and films, but emphasis should also be placed on the ability of the anchors to transfer the loads to those members, else severe damage and fatalities could result from the failure of apertures while main structures would stay intact after they are subjected to these kinds of loads.
This paper will present the results of a study designed to investigate the effect of impulse loads of short durations on Titen HD®, one of the mechanical screw anchors manufactured by Simpson® Inc. Three anchor diameters (6.4, 9.5 and 12.7 mm) at manufacturer specified effective embedment depths were tested under static and impulse type loading in shear and tension.
Results from the tests, as well as theoretical static failure loads and modes based on the CSA and ACI codes will be compared. The apparent increase in dynamic strength will be quantified by a dynamic increase factor (DIF) for the both shear and tension. DIF for design of anchor will be recommended.