Experimental analysis of new interfaces for connections by adhesion, interlocking and friction

Abstract

This paper presents the results of an experimental program developed to investigate the behavior of an innovative technology for connections by adhesion, interlocking and friction in composite structures. Connections have a strategic importance for precast concrete and steel-concrete composite structures, since they determine the global structural behavior and affect the whole production process, from execution to assemblage and other services on site. Currently, however, steel-concrete composite connections are not completely adapted for their use in prefabricated slabs. In this way, the development of new types of connections is clearly necessary, where connections by adherence (or connections by adhesion, interlocking and friction) seem quite promising. To improve the knowledge in the field of connections by adherence, this paper proposes a new geometry of embossments in the steel and in the concrete surfaces associated with the use of a high performance mortar. Monotonic push-out tests are performed, and their results are presented and discussed. A satisfactory behavior of the proposed connection in terms of strength is observed, justifying further studies on the subject.

Tests on composite beams using new connections by adherence

“…The next sections will describe the flexural tests on steel and concrete composite beams, performed in the Structures Laboratory at the School of Engineering of Sao Carlos, Brazil. This experimental program complements the experimental study presented by Diógenes et al (2015).…”

“…The results previously obtained in push-out tests, and reported in Diógenes et al (2015), indicate that in connections by adhesion, interlocking and friction, the beginning of rupture is a fragile and irreversible process, and a direct function of the slip value. In these tests, the behavior of the connection is usually evaluated by comparing the load applied and the slip measured at the interface between the concrete slab and the steel beam.…”

“…Four specimens of composite beams were manufactured using the R and RP-type connectors associated with precast slabs. The R-type and RP-type connectors were studied and assessed by Diógenes et al (2015) with the objective of finding an easy way to produce shear connections in prefabricated elements and to adapt this new connection technology to the Brazilian market.…”

“…Figure 4 shows the surface obtained on the reinforced concrete precast slab and presents the sequence of grouting process. More details about the connection surfaces are presented in Diógenes et al (2015) For comparison purposes, two composite beam specimens employing RP-type connectors were also produced, using cast in-place slabs. Therefore, a total of six specimens were prepared for testing.…”

“…with no overlapping of rebars through the connector ( To produce the cast in place specimens, VM-01 and VM-02, a timber formwork was prepared and traditional methods of concreting were applied ( Figure 4). (Diógenes et al 2015). The values of the reinforcement properties presented in Table 2 correspond to the nominal values provided by the manufacturer.…”