Systematic Approach and Design Procedure
The geometry, stiffness, and load carrying capacity of the adhesive joint are of central significance for thestructural behavior of the hybrid beam. This implies
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detailed knowledge of the mechanical values andthe durability of the adhesives. Particularly, discontinuities in the boundary areas require a closer examination.
The aim of the INNOGLAST project [5,6] is to derive simple design recommendations for bonded hybrid steel-glass beams, taking into consideration the common safety specifications of glass and thus avoiding extensive finite element calculations. In order to achieve this, a systematic approach was chosen, which is shown in Table 1.
The basis for this approach is the knowledge of the slip and elongation characteristics of the adhesive joint (Table 1, I) arising from the context of the building structure, defining the structural and geometrical requirements for the adhesive joint. Depending on the connection type (Table 1, II), slip differential equations  are a useful means to determine the slip-strain behavior. In the next step, appropriate adhesives are chosen (Table 1, III) and the mechanical values are determined (Table 1, IV), and these are then carried over to small – scale push-out tests (Table 1, V-VI) and verified by large-scale component tests (Table 1, VII). Finally, design recommendations are derived (Table 1, VIII).
In the following, the detailed approaches for the choice of appropriate adhesive systems and the derivation of suitable mechanical values are presented, in particular with respect to durability and realistic bonding geometries.