Investigations on Linear Silicone Joints for Glass-Metal Elements with Composite Structural Behavior

A trend towards adhesive connections instead of mechanical ones can be observed for transparent facades in recent years. Furthermore, research efforts are made to increase the efficiency regarding material use by designing systems with composite structural behavior. In this article, experimental and numerical results obtained for linear structural silicone joints between glass and stainless steel substrates, investigated separately under tensile and under shear loading, are discussed. The two selected adhesives, Dow Corning® 993 and Sikasil® SG-550, are approved for structural sealant glazing systems and are planned to be used within a novel concept for façade elements with composite structural behavior, consisting of a glass pane and a filigree metal framing. For an adhesive joint with prismatic geometry, the influence of different lengths, widths and thicknesses of the joint on its mechanical performance is assessed experimentally under tensile loading, while under shear loading only different thicknesses are investigated. Both under tensile and under shear loading, a dependency of the failure engineering stresses on the joint thickness is noticed. In a second step, the suitability of selected hyperelastic models is assessed for predicting the load versus displacement behavior of the investigated linear adhesive joints. The parameters required for these models are determined based on uniaxial tensile tests on dumbbell specimens

ne–xt facades: Proceedings of the COST Action TU1403 Adaptive Facades Network Mid-term Conference

The ne-xt facades conference is the official International Mid-term Conference of the European COST Action TU1403 ‘Adaptive Facades Network’, an international scientific cooperation with the aim to harmonise, share and disseminate technological knowledge on adaptive facades on the European level. During the mid-term conference first results are presented to stakeholders from industry and design and to the public. The goal is to share knowledge and discuss novel facade concepts, effective evaluation tools and design methods for adaptive facades. Alongside the contributions from members of the COST Action, the conference received many contributions from external researchers and the industry. This added to the interesting debate about adaptive facades we believe it was an excellent stage to test the first results of the COST Action

Linear adhesive connections at the edge of laminated glass panes: an experimental study under tensile, compressive and shear loading

Adhesive connections experience in recent years an increasing popularity in the field of structural glass. Generally, linear adhesive joints are positioned on the surface of glass panes as in the case of structural sealant glazing systems. However, due to the existing trend for larger glass elements and implicitly glass panes with higher thickness, connections with adhesive joints at the edge of laminated glass panes become more interesting. In this article, experimental results for such linear adhesive joints with glass and stainless steel substrates, tested under tensile, compressive and shear loading, are presented and discussed. Three different cross section geometries of the joints are investigated: rectangular, L-shaped and U-shaped. For each of these cross sections, two silicone adhesives approved for structural sealant glazing systems and one structural acrylic adhesive are included in the experimental programme. All tests are performed at ambient conditions. Beside the mechanical behaviour in the form of load versus displacement results, also the failure modes and patterns are analysed. Regarding the interaction of the adhesives with the interlayer material under compressive loading, it is observed that at certain loads bubbles start to form in the interlayer and subsequently a delamination is initiated for all three adhesives. Moreover, the specimens with acrylic adhesive exhibit delamination as well under tensile and under shear loading. The results from this experimental study provide novel findings for linear adhesive connections at the edge of laminated glass panes and represent a basis for further investigations and developments on such joints.ISSN:2363-5142ISSN:2363-515

Stability of glass elements \u2013 TG12 Final report

Because of their characteristic high slenderness ratios, glass elements are usually relatively sensitive to buckling phenomena. As regards laminated glass components in particular, for instance effects of temperature variations or load duration complicate the correct esti-mation and prediction of their buckling response, which is already conditioned by slenderness ratios and by limited tensile strengths. In this context, within COST Action TU0905 \u2018Structural glass\u2019, the Task Group 12 \u2018Stability\u2019 focuses its main networking activity on the collection, assessment, discussion and validation of existing analytical models, as well as on the development of new techniques for a practical buckling analysis and verification of structural glass elements. In the paper, an overview of main activities and results is provided