PSI - Issue 38

Hamza Abbad El Andaloussi et al. / Procedia Structural Integrity 38 (2022) 238–250 241 Hamza Abbad El Andaloussi, Luc Mouton, Firas Sayed Ahmad, Xabier Errotabehere, Stéphanie Mahérault-Mougin, Stéphane Paboeuf/ Structural Integrity Procedia 00 (2021) 000 – 000 4

3.1. Experimental Setup A full-scale industrial bonded reinforcement (product called COLDSHIELD) is installed as per approved industrial process (dimensions: 3300 mm*750 mm) and cut in order to obtain specimens called “single -strap specimens”. One of the technical claims of the aut hors is that manufacturing and installation of the reinforcement (not detailed in this article) are representative of real in situ installation operation, as the studied technology gives guarantees in terms of process control (e.g. bonding parameters; humi dity level on the bondline…). The experimental fatigue campaign consists of testing 25 single-strap specimens as per ISO12107:2012 Metallic materials — Fatigue testing — Statistical planning and analysis of data. The dimensions of the single-strap specimens are: 1600 mm x 750 mm, and are representative of the full-scale edifice. The specimens are composed of: • A reinforcement plate: Superduplex plate of 13 mm thickness; • A fluorosilicone seal bonded to the periphery of the Superduplex plate; • A low modulus polymer with a gradual thickness between 10 and 15 mm (defined as Intermediate Deformation Layer – IDL – patented technology); • An epoxy adhesive with a gradual thickness included between 5 and 10 mm. • A high strength steel substrate (f y =960 MPa) of a 20mm thickness, It is to be noticed that a high strength steel substrate is selected in order to be able to impose high loads to the reinforcement during the fatigue tests campaign. Each of the tested single-straps is instrumented with 6 strain gauges as follows: • 1 gauge at the center of the Superduplex plate (J4) • 5 gauges on the steel substrate (J1, J2, J3, J5, J6).

Figure 1 Illustration of a single-strap specimen instrumented with strain gauges

The mechanical dynamic tests are performed with an MTS testing machine exhibiting a load capacity of 1200 kN. The below picture presents the experimental test set-up: