Long‐term shear strength of RC beams based on a mechanical model that considers reinforcing steel corrosion

Abstract

Corrosion of stirrups (generally with small diameters and concrete covers) significantly affects the shear strength of reinforced concrete elements. As shear failures may lead to brittle collapses, hence the need to avoid them during structures' entire service life. The Compression Chord Capacity Model (CCCM), a shear mechanical model, was recently extended to predict the strength of corrosion-damaged beams by identifying the model parameters that could be most affected by steel corrosion. In this paper, the CCCM is combined with two material deterioration models included in the new Spanish Structural Code, and considers carbonation of concrete or chloride ions, to predict long-term shear strength evolution. Finally, a parametric analysis is carried out to explore the effect of the most influential parameters on shear strength degradation according to the used models and depending on different exposure classes.

Durabilidad y rediseño de un puente de hormigón en ambiente costero mediante un método no destructivo de detección de daños

“…According to the Spanish concrete design code ( 2008), as shown in this study and other research (Navarro, Martí, & Yepes, 2019;Bruet et al, 2018;Frontera, & Cladera, 2022), the critical chloride concentration (C th ) must be determined by the designer in accordance with the specific concerns related to the structure, whereas under normal conditions, a value of 0.6% of the cement weight can be used to evaluate the limit state in terms of passive reinforcement corrosion. In addition to this analysis, in this study, the thickness of the concrete cover of the structure in the deck part was performed for the thicknesses of 3 (Refrense), 3.5, 4, 5, and 6 cm and for the columns with the thickness of the concrete cover of 4 (Refrense), 4.5, 5, 6, and 7 cm.…”

Life-Cycle Cost Assessment Using the Power Spectral Density Function in a Coastal Concrete Bridge

“…From Alonso et al [60], the chloride threshold obtained from natural experiments includes a broad range of values, from more than 0.4 to 4 percent. In this study, and also other research [61][62][63], and according to the Spanish concrete design code [56], the critical chloride concentration (C th ) must be determined by the designer in line with the structure's unique concerns, where under normal conditions a value of 0.6% of the cement weight could be used to assess the limit state in relation to passive reinforcement corrosion. Therefore, the mean value of critical chloride concentration under normal conditions could be considered to be 0.6% of the cement weight.…”

A Study on the Distribution of Shear Forces Between Resisting Mechanisms in an RC Element Without Stirrups

“…It will be shown below that the dowel effect in the case studied in this paper is very small. More recent work includes other variables such as the influence of time-dependent effects [16], the influence of time dependent effects plus corrosion [17], the influence of the slenderness of the cross section [18], the effect of axial forces [19], while others are trying to apply artificial intelligence to predict shear resistance [20], [21].…”