BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI Publicat de Universitatea Tehnică „Gheorghe Asachi” din Iaşi Tomul LXI (LXV), Fasc. 4, 2015 Secţia CONSTRUCŢII. ARHITECTURĂ BEHAVIOUR OF CFRP-TO-STEEL INTERFACE IN ADHESIVELY BONDED SINGLE LAP JOINTS EXPERIMENTAL SET-UP BY VLAD LUPĂŞTEANU * , NICOLAE ŢĂRANU, PETRU MIHAI and GABRIEL OPRIŞAN “Gheorghe Asachi” Technical University of Iaşi Faculty of Civil Engineering and Building Services Received: October 14, 2015 Accepted for publication: October 30, 2015 Abstract. This paper presents the set-up of an experimental study which focuses on the behavior of carbon fiber reinforced polymer (CFRP) composite strips, adhesively bonded to steel surfaces. For that purpose, single lap shear pull-off specimens were designed and prepared. The experimental program consists of a wide range of combinations between three types of CFRP strips (with normal, medium and high modulus of elasticity) and two types of adhesives, each of them being applied in three thicknesses (1 mm, 2 mm and 3 mm). For each combination, three identical specimens were prepared. Important aspects regarding the behavior of CFRP-to-steel bonded joints, such as: identification of the failure modes, characterization of the bond-slip behavior of the interfaces, checking the validity of the effective bond length can be obtained and analyzed by performing the envisaged experimental program based on the proposed set up. Key words: CFRP; bonded joints; steel surfaces; single lap shear pull-off. 1. Introduction Fiber reinforced polymer (FRP) composites are widely used as strengthening materials for concrete and masonry elements, offering significant * Corresponding author: e-mail: vlad.lupasteanu@gmal.com