Strength of Corroded RC Beams with Bond Deterioration

Resistance of corroded RC beams: Extending fib Model Code 2010 models

“…A part of the tests (numbers 1–4, 8–20 in Table 2) has been analyzed in Coronelli et al 8 and are reported for comparison, with the new bond model used here. Two new campaigns are studied (numbers 5–7 and 21–23).…”

“…A general remark is that the corrosion attack values considered for most cases are greater than 0.25 mm, the maximum value considered in Model Code 2010 Chapter 6 bond deterioration functions (Figure 3). Figure 5(b) shows the ratio of the ARC 2010 predictions to those obtained with the simplified model by Coronelli et al 8 Values greater than unity of the ratio can be explained by considering the conservative assumptions in Coronelli et al 8 for specimens with highly corroded stirrups: in the simplified approach proposed there the transverse steel effect is not considered in the residual bond of specimens with more than 2/3 of the cross section of links corroded.…”

“…The corrosion levels considered are rather low, compared to the highest levels reached in tests and those met in practice in heavily deteriorated structures. To extend to higher levels of deterioration, the following simplified approach has been proposed by Coronelli et al 8 Regan and Reid 6 tested specimens with delaminated covers and proposed an empirical model for residual bond strength:…”

“…Care has been taken to use tests with either environmental corrosion over years, [10][11][12] or slow artificial processes. 2,[13][14][15][16][17][18] A part of these tests has been analyzed in Coronelli et al 8 and are reported for comparison, with the new bond model used here. In addition tests from two new campaigns are added.…”

“…On this basis Coronelli et al 8 proposed simple strut‐and‐tie and truss models for the resistance of corroded RC beams in flexure, shear, and anchorage bond. A simplified model was used for bond deterioration.…”