Tensile behavior and design of adhesive anchors embedded in thin concrete members

Abstract

■ Test results were used to create a design model for adhesive anchors postinstalled in thin concrete members. The model's accuracy and variability are similar to code-based models for other applications. Precast concrete sandwich wall panel systems have been used in the construction industry for the past 50 years because of their structural and thermal insulation efficiency. Precast concrete sandwich panels consist of two thin concrete layers separated by a thermal insulation layer. The concrete layers are commonly made structurally composite using shear connectors. The thickness of the layers typically ranges from 2 to 5 in. (50.8 to 127 mm). Postinstalled anchors are used in these panels for purposes including beam supports, repairing alignments, and installation of canopies and signs. However, anchorage in precast concrete sandwich panels can be challenging because of the thinness of the concrete layers and the lack of research and code provisions regarding anchorage in such members. In addition, codes and specifications impose limits on the minimum concrete member thickness and minimum anchor embedment depth. These limitations further hamper the use of postinstalled anchors in sandwich panels.