Cyclic Behavior of Smooth Steel Reinforcing Bars: Experimental Analysis and Modeling Issues

Abstract

This article presents the results of an experimental campaign on the cyclic behavior of smooth steel bars, used as internal reinforcement of existing Reinforced Concrete (RC) structures; the stress-strain relationship is analyzed for different values of L/D ratio, where L is the stirrup spacing and D is the longitudinal bar diameter. Most of the experimental tests concerned smooth bars with L/D ratios ranging between 5 and 100. The analysis of the test results is complemented by some comparisons of the curves obtained by experimental tests on smooth steel bars with those obtained by experimental tests on ribbed steel bars. The theoretical predictions obtained by existing models available in the literature on the cyclic behavior of ribbed steel bars are then discussed. Our review of these formulations underlines their range of applicability as well as their potential to predict the damage and buckling that occur for different L/D ratios of the smooth steel bars

Phenomenological hysteretic model for corroded reinforcing bars including inelastic buckling and low-cycle fatigue degradation

“…To capture this behaviour in the model, different equations are used for unloading at small and large strain demands. Similar behaviour was observed by other researchers [21,22].…”

“…Other researchers have also come up with the same conclusion based on the experimental results [21][22][23]. This shows a stable pattern in cyclic behaviour of reinforcing bars with the effect of buckling.…”

“…Experimental data show that the buckling strength of bars is a function of the plastic tension strain history as well as the slenderness ratio [22].…”

“…In previous decades, a number of researchers have studied the cyclic behaviour of reinforcing steel with and without buckling [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23]. They have tried to address simulation of uncorroded reinforcement; however, there are many critical structures that are located in regions of high seismicity and that are exposed to corrosive environments.…”

FRP Strengthened Brick-Infilled RC Frames: An Approach for their Proper Consideration in Design

“…The steel model proposed by Menegotto and Pinto [31,32] and the nonlinear constant confinement concrete model of Mander et al [33] were applied for the reinforcement bars and the concrete, respectively. The former can be applied even for smooth reinforcing bars, i.e., without ribs, with a proper selection of parameters [34].…”