Dimensioning of silicone adhesive joints: Eurocode-compliant, mesh-independent approach using the FEM
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Dimensioning of silicone adhesive joints: Eurocodecompliant, mesh-independent approach using the FEM Micheal Drass
· Michael A. Kraus
Received: 1 February 2020 / Accepted: 10 July 2020 © The Author(s) 2020
Abstract This paper deals with the application of the semi-probabilistic design concept (level I, DIN EN 1990) to structural silicone adhesives in order to calibrate partial material safety factors for a stretch-based limit state equation. Based on the current legal situation for the application of structural sealants in façades, a new Eurocode-compliant design concept is introduced and compared to existing design codes (ETAG 002). This is followed by some background information on semi-probabilistic reliability modeling and the general framework of the Eurocode for the derivation of partial material safety factors at Level I. Within this paper, a specific partial material safety factor is derived for DOWSIL 993 silicone on the basis of experimental data. The data were then further evaluated under a stretch-based limit state function to obtain a partial M. Drass (B) · M. A. Kraus M&M Network-Ing UG (haftungsbeschränkt), Lennebergstraße 40, 55124 Mainz, Germany e-mail: [email protected]; [email protected] https://www.mm-network-ing.de M. Drass Institute for Structural Mechanics and Design, Technische Universität Darmstadt TU Darmstadt, Franziska-Braun-Str. 3, 64287 Darmstadt, Germany M. A. Kraus Civil and Environmental Engineering, Stanford University, Y2E2, 473 Via Ortega, Stanford, CA 94305, USA e-mail: [email protected]; [email protected] https://www.mm-network-ing.de
material safety factor for that specific limit state function. This safety factor is then extended to the application in finite element calculation programs in such a way that it is possible for the first time to perform mesh-independent static calculations of silicone adhesive joints. This procedure thus allows for great optimization of structural sealant design with potentially high economical as well as sustainability benefits. An example for the static verification of a bonded façade construction by means of finite element calculation shows (i) the application of EC 0 to silicone adhesives and (ii) the transfer of the EC 0 method to the finite element method with the result that mesh-independent ultimate loads can be determined. Keywords Partial material safety factor · Structural silicone adhesive · SSG façades · Design and computation
1 Introduction and current situation State-of-the-art glass façades are designed with a strong emphasis on a transparent appearance with minimal visibility of the supporting structures. During the last fifty years a lot of experience with structural silicone adhesive joints in façade design has been gained worldwide. Beginning with linear adhesive joints, which are used along a window system for homogeneous load transfer (Staudt et al. 2018), up to local fixings, where glass panes are only bonded locally with so-called point
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