Development of Bonded/Riveted Steel Anchorages of Prestressed CFRP Strips for Concrete Strengthening

Abstract

CFRP (carbon fiber reinforced polymer) strips are currently often used to strengthen reinforced concrete structures in flexure. In order to ensure effective strengthening, proper connection between FRP material and concrete structure is needed. CFRP strips can be applied passively (only by bonding to the concrete surface) or actively (by prestressing before bonding). In the case of passive strengthening, CFRP strips connecting by bonding to the surface along the strengthened element are usually sufficient. However, active (prestressing) CFRP strips should be additionally anchored at their ends. Anchoring of unidirectional CFRP strips to the reinforced concrete is difficult because of their weak properties in transverse directions. The paper presents a development of mechanical steel anchorages used in an active CFRP flexural strengthening system for reinforced concrete structures. The anchorages were made of steel plates connected to CFRP strips with steel rivets and epoxy adhesive. They were developed within series of tests on specimens from small-scale to full-scale tested in an axial tensile scheme. The paper describes successive modifications of the anchorages as well as the results of full-scale tests. The final version of the anchorage developed during the research had a tensile failure force of 185 kN, which is sufficient value for CFRP strengthening purposes.

Possibilities of Increasing Effectiveness of RC Structure Strengthening with FRP Materials

“…An example of this type of solution is the NEOXE Company (Warsaw, Poland) anchorage system, in which the composite laminate is anchored in prefabricated components, according to Siwowski et al [ 49 , 50 ]. The composite is glued between steel sheets using epoxy resin.…”

Experimental research on hybrid anchorages of prestressed composite strips for structural strengthening

“…The arrangement of bolts has been developed during research on the bonded/riveted type of the anchorages used in the system. 33 The detailed scheme of the full-scale specimen is shown in Figure 2.…”

Bond parameters for peeling and debonding in thin plated RC beams subjected to mixed mode loading – Framework

“…beams (Oehlers and Moran, 1990;Oh et al, 2003b;Raoof et al, 2000;Raoof and Zhang, 1997). Prediction of failure loads under premature modes of failure that involve failure of interface or separation of concrete cover is still under debate (Al-Mahaidi and Kalfat, 2018, Dar et al, 2019Demir et al, 2018;Pia ˛tek et al, 2020;Tahar et al, 2019;Wu and Eamon, 2017).…”