Innovations Through Adhesives

It is primarily innovative projects and visionary design studies and prototypes that extend the range of construction beyond those described so far and those forms regulated by legislation in Germany. In particular, transparent or high – modulus adhesives open up new types of applications for glued glass joints. One example of a further development is the glass hybrid component (Fig. 4). Linear joints between glass and ductile materials increase the load bearing and resid­ual load bearing behavior of glass. Potential combinations with steel, alumi­num, timber, and glass fiber-reinforced plastics (GFRP), even reinforced concrete, have already been investigated in a number of research projects [26-29]. Glass-metal [28] and glass-timber composite cross-sections represent interesting approaches and the first transfer projects, based on research and leading to practical applications [28,29]. Linear adhesive joints have already been used for connecting panes of glass to delicate aluminum frames for trans­parent partition systems for interior use.

Likewise, adhesive point fixings have already been used in facades in a few isolated cases. Penetrating or clamping the glass is therefore avoided and the glass surface takes on a very homogeneous appearance. Another advantage of adhesive point fixings is that stress peaks can be reduced. As a rule, these sys­tems require additional components for carrying the self-weight of the glass and for retaining the glazing should an adhesive joint fail. One special develop­ment for a bonded glass retention system is therefore based on a combination of countersunk drilled holes, which do not penetrate the glass, and point fixings fitted into these [30].

In addition, several glass elements can be joined together to form more complex load bearing structures. In order to be able to omit all metal connec­tors and fixings in such a situation, transparent adhesives can be used for planar adhesive joints (Fig. 5). Such a design—an all-glass pavilion supported by

FIG. 4—Design studies at glasstec 2010 in DUsseldorf, Germany: Sample facade made from a hybrid glass-steel assembly.

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FIG. 5—Design studies at glasstec 2010 in Diisseldorf, Germany: transparent bonded glass frame corners.

bonded glass frames—was erected for the first time in Germany in 2009 within the scope of an Individual Approval [31].[22]