Th. Misiek/S. Käpplein · Strength and stiffness of shear-loaded fastenings for metal members and sheeting using fastening screws and rivets
7 Summary and final remarks This paper introduces design formulas from different codes for shear-loaded fastenings in thin-walled sheeting and sections, some of them having limitations with regard to application or questionable constant factors. Based on a huge number of tests, design formulas eliminating this problem are given. In addition, stiffness values of fastenings loaded in shear are collected and a recommendation is given. Notwithstanding the fact that most fastener manufacturers have European Technical Approvals (ETAs) based on test results for their fasteners, general design formulas are still relevant because they provide design values for applications not yet tested and guidance while preparing or evaluating tests for approvals. In any case, the application range stated by the manufacturer should be respected. This refers to both drilling capacity and clamping thickness, and also thickness ratios. Fixing thick sheets on thin ones will require special attention with respect to the thread formation in the thin sheet and tightening torque (overtightening and ruined thread). References [1] ECCS TC 7: The Testing of Connections with Mechanical Fasteners in Steel Sheeting and Sections. ECCS pub. No. 124, Brussels, 2009. [2] ECCS TC 7: The Testing of Connections in Steel Sheeting and Sections. ECCS pub. No. 21, Brussels, 1990. [3] Klee, S., Seeger, T.: Vorschlag zur vereinfachten Ermittlung von zulässigen Kräften für Befestigungen von Stahltrapezprofilen (Proposal for the simplified determination of admissible forces for fastenings of steel sheeting panels).TH Darmstadt, Institut für Stahlbau und Werkstoffmechanik,1979. [4] EN 1993-1-3:2006+AC:2009: Eurocode 3: Design of steel structures – Part 1-3: General rules – Supplementary rules for cold-formed members and sheeting. [5] EN 1999-1-4:2007+AC:2009: Eurocode 9: Design of aluminium structures – Part 1-4: Cold-formed structural sheeting. [6] DIN 18807-6:1995-09: Trapezoidal sheeting in buildings – Part 6: Aluminium trapezoidal sheeting and their connections – Determination of loadbearing capacity by calculation.
[7] StbK-N5: Tunnplåtsnormen (Swedish Code for Light-Gauge Metal Structures). Stalbyggnadsinstitutet (National Swedish Committee on Regulations for Steel Structures), Stockholm, 1979. [8] EN 1990:2002 + A1:2005 + A1:2005/AC:2010: Eurocode: Basis of structural design. [9] Johansen, K. W.: Theory of timber connections. Mémoires AIPC/IVBH Abhandlungen/IABSE pub. 9 (1949), pp. 249– 262 (http://dx.doi.org/10.5169/seals-9703). [10] Kathage, K., Lindner, J., Misiek, T., Schilling, S.: A proposal to adjust the design approach for the diaphragm action of shear panels according to Schardt and Strehl in line with European regulations. Steel Construction 6 (2013), pp. 107–116. [11] Käpplein, S., Ummenhofer, T.: Querkraftbeanspruchte Verbindungen von Sandwichelementen (Shear loaded fastenings of sandwich panels). Stahlbau 80 (2011), pp. 600–607. [12] ECCS TC7: European Recommendations for the Application of Metal Sheeting acting as a Diaphragm – Stressed Skin Design. ECCS pub. No. 88, Brussels, 1995. [13] Davies, J. M., Bryan, E. R.: Manual of stressed skin diaphragm design. Granada Publishing Limited, St. Albans, UK, 1982. [14] Baehre, R.: Zur Schubfeldwirkung von Aluminiumtrapezprofilen (Diaphragm action of trapezoidal aluminium sheeting). Stahlbau 62 (1993), pp. 81–87. [15] Schwarze, K., Berner, K.: Temperaturbedingte Zwängungskräfte in Verbindungen bei Konstruktionen mit Stahltrapezprofilen (Locally enhanced peak forces in connections of IBR sheeting due to thermal expansion). Stahlbau 57 (1988), pp. 103–114. Keywords: thin-walled structures; screws; rivets; fastener; fastening; connection
Authors: Dr.-Ing. Thomas Misiek, Breinlinger Ingenieure Tuttlingen – Stuttgart, Kanalstr. 1-4, 78532 Tuttlingen, thomas.misiek@breinlinger.de Dipl.-Ing. Saskia Käpplein, Versuchsanstalt für Stahl, Holz und Steine, Karlsruher Institut für Technologie, Otto-Ammann-Platz 1, 76131 Karlsruhe, saskia.kaepplein@kit.edu
Steel Construction 7 (2014), No. 1
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