Load-Bearing Behaviour of Laminated Tempered Glass with Reground Edges

Designers use exposed glass edges for decoration, for example within glass steps, glass beams or glass columns. This application requires a mechanical finishing to realize a high optical quality and to compensate the edge notch resulting from the lamination process. Regrinding of annealed glass is allowed, but in the case of glass with load bearing functions, regrinding of tempered glass leads to a risk of premature failure caused by a reduction of the compression zone at the glass edge. A research project at the Institute of Building Construction, Technische Universität Dresden, examined the impact of regrinding tempered glass on the load-bearing capacity. Previous studies on single-glass panes showed a decreasing of the load-bearing capacity depending on the regrinding depth. Based on this, the project team conducted component tests on glass steps, glass balustrades and laminated glass beams made from fully tempered glass and heat-strengthened glass with and without reground edges to prove the previous results. The paper focuses on the description and evaluation of the component tests as well as the structural design.