Efeito do confinamento na aderência entre barras de aço e concreto de alta resistência à compressão

Study of the influence of the surface characteristics of steel bars on the steel-concrete interaction

“…The steel-concrete interaction has been constantly investigated by authors such as Leonhardt and Monnig (1977), Fusco (1995), França (2004), Almeida Filho (2006, Lorrain, et al (2010), Hong and Park (2012), Choi (2013), Santana (2014), Rosales (2016), Majumdar, et al (2017), Zulini (2019) among others, due to its importance for the performance of reinforced concrete elements. Through adherence, the bond between steel and concrete is represented by the relationship of bond stress x slipping of the bar inside the concrete.…”

Numerical formulations based on the Isogeometric Boundary Element Method for the mechanical analysis of three-dimensional reinforced nonhomogeneous solids

“…Several studies were able to investigate the adherence mechanism in a deeper level using this experimental scheme: (106) experimented with loading cycles, being able to analyse the load history's contribution and cumulative effects; (107) analysed highperformance concrete reinforced by steel bars. More recently, several studies have worked on experimental analyses focused on ultra high-performance concrete reinforced by steel bars, as mentioned in (108). ( 109) presents a modified pullout test, in which only half of the steel bar's length is adhered to the concrete.…”

“…In addition, the traditional experimental scheme usually consists of a squared-base concrete prism. However, several authors adopt cylindrical concrete specimens (110,108), which provides a constant concrete cover to protect the reinforcing bar.…”

“…The steel bar is pulled-out by the machine claw, which enables the adherence behaviour analysis by force versus displacement curves. Experimental results of this test have been presented by (108), which used the experimental scheme illustrated in Figura 47(b). Figure 48(a) illustrates the collocation points for the IGABEM model.…”