Issue 43

E. Maiorana et alii, Frattura ed Integrità Strutturale, 43 (2018) 205-217; DOI: 10.3221/IGF-ESIS.43.16 217 - As observed in the previous point, to evaluate exactly the strength of the friction joint and to establish an admissible standard deviation on the k -factor is suggested, to reduce the admissible standard deviation on the k - factor and the safety coefficient on preloading force. - Finally, the discussion underlines the necessity to increase the applied force, to harmonize the safety coefficients and to review the design rules, justifying the adoption of a slip factor value in the calculation depending by the allowable displacement of the bolt inside the hole. A CKNOWLEDGMENTS he valuable contribution of Dr. Francesco Mutignani to the discussion is acknowledged. R EFERENCES [1] EN 1993-1-8:2005. Design of steel structures, CEN, Brussels, Belgium. [2] EN 1090-2:2011. Execution of steel structures and aluminum structures, CEN, Brussel, Belgium. [3] RCSC. Specification for structural joints using high-strength bolts, AISC, (2014), Chicago . [4] ASTM A325 Standard Specification for Structural Bolts, Steel, Heat Treated, 120/105 ksi Minimum Tensile Strength (2016). [5] EN 14399:2005. High-strength structural bolting assemblies for preloading, CEN, Brussels, Belgium. [6] ISO 8501-1:2007. Preparation of steel substrates before application of paints and related products. Visual assessment of surface cleanliness. [7] ECCS. Slip factors of connections with H.S.F.G. bolts, Bolted and Welded Connection, publication n.37 (1984), Brussels, Belgium. [8] Kulak, G.L., Fisher, J.W., Struik, J.H., Guide to design criteria for bolted and rivet joints, 2nd Ed., New York, John Wiley & Sons, (1987). [9] Maiorana, E., Pellegrino, C., Comparison between Eurocodes, North American and Main International Codes for Design of Bolted Connections in Steel Bridges, Journal of Bridge Engineering, 18(12) (2013) 1298-1308. [10] Cruz, A., Simões, R., Alves, R., Slip factor in slip resistant joints with high strength steel, Journal of Constructional Steel Research, 70 (2012) 280-288. [11] Heistermann, C., Veljkovic, M., Simões, R., Rebelo, C., Simões da Silva, L., Design of slip resistant lap joints with long open slotted holes, Journal of Constructional Steel Research, 82 (2013) 223-233. [12] Annan, C.-D., Chiza, A., Characterization of slip resistance of high strength bolted connections with zinc-based metallized faying surfaces, Engineering Structures, 56 (2013) 2187-2196. [13] Annan, C.-D., Chiza, A., Slip resistance of metalized-galvanized faying surfaces in steel bridge construction, Journal of Constructional Steel Research, 95 (2014) 211-219. [14] Latour, M., Piluso, V., Rizzano, G., Experimental analysis on friction materials for supplemental damping devices, Construction and Building Materials, 65 (2014) 159-176. [15] Pavlović, M., Heistermann, C., Veljković, M., Pak, D., Feldmann, M., Rebelo, C., Simões da Silva, L., Friction connection vs. ring flange connection in steel towers for wind converters, Engineering Structures, 98 (2015) 151-162. [16] Ferrante Cavallaro, G., Francavilla, A., Latour, M., Piluso, V., Rizzano, G., Experimental behaviour of innovative thermal spray coating materials for FREEDAM joints, Composites Part B: Engineering, 115 (2017) 289-299. [17] Li, J., He, Q., Zhang, K., Lin, Z., Ding, M., Ju, J., Slipping coefficient study of frictional high strength bolt joint, Computer Modelling & New Technologies, 18(12d) (2014) 133-137. [18] Huang, Y.-h., Wang, R.-h., Zou, J.-h., Gan, Q., Finite element analysis and experimental study on high strength bolted friction grip connections in steel bridges, Journal of Constructional Steel Research, 66 (2010) 803-815. [19] Federal Highway Administration. Interlaboratory Variability of Slip Coefficient Testing for Bridge Coatings, publication n. FHWA-HRT-14-093 (2014). [20] CNR UNI 10011:1997. Steel structures. Instructions of design, construction, testing and maintenance ( in Italian ). [21] EN 10025:2004. Hot rolled products of structural steels, CEN, Brussels, Belgium. [22] D.M. 14.01.2008. New Technical Standards for Construction ( in Italian ). T