A novel, reversible structural system comprising interlocking, dry-assembled cast glass components is currently being developed at the TU Delft Glass & Transparency Lab. This paper, in continuation of the research conducted by (Oikonomopoulou et al. 2018a), investigates the mechanical properties of different materials that function as dry interlayers for interlocking cast glass structures. The interlayers should be preferably transparent, able to be pre-formed to the desired shapes, and resistant to UV-radiation-induced colour shifts, long-term compressive loads and creep. Based on the above criteria, polyurethane (PU) rubber with a shore hardness between 60A - 80A is chosen as the most suitable material. Accordingly, different readily available PU interlayers are selected and cast in the desired shape. Each interlayer is introduced between two interlocking osteomorphic cast glass components (bricks) and the assembly is tested under compression in series of 3 specimens. The experiments indicate that for the harder interlayer variants, failure mainly occurs due to peak stresses occurring at the shortest section of the brick, where the manufacturing tolerances of the concave-convex surface are the highest, leading to mismatch, i.e. incomplete contact at that area of the interlayer with the glass units. The stiffer interlayers further contribute to the failure due to the increased shear stresses induced at the edges of the interlocking surface while they are deforming. This is evident by the radial breaking pattern of the failed glass blocks. Interlayer variants with low tear resistance fail due to the perforation of the interlayer leading to glass-to-glass contact. Still, all specimens with interlayer in between presented a considerably higher failure stress than an assembly with no interlayer, highlighting the critical contribution of the PU to the structural performance of the system.
Original languageEnglish
Title of host publicationAdvances in Engineering Materials, Structures and Systems: Innovations, Mechanics and Applications
Subtitle of host publicationProceedings of the 7th International Conference on Structural Engineering, Mechanics and Computation (SEMC 2019), September 2-4, 2019, Cape Town, South Africa
EditorsAlphose Zingoni
Place of PublicationLondon
PublisherCRC Press
Number of pages6
ISBN (Electronic)978-0-429-42650-6
ISBN (Print)978-1-138-38696-9
Publication statusPublished - 2019
EventThe Seventh International Conference On Structural Engineering, Mechanics And Computation - Southern Sun Cape Sun Hotel, Capetown, South Africa
Duration: 2 Sep 20194 Sep 2019


ConferenceThe Seventh International Conference On Structural Engineering, Mechanics And Computation
Abbreviated titleSEMC 2019
CountrySouth Africa
Internet address

    Research areas

  • structural glass, interlocking components, glass brick, cast glass, interlayer, building system, glass structure

ID: 62854891