Flexure-controlled ultimate deformations of members with continuous or lap-spliced bars

Estimation of Effective Stiffness of Infill Panels at Damage Limitation Limit State for Low- And Mid-Rise Infilled Rc Frames

“…The behavior is assumed linear elastic up to cracking and perfectly-plastic after yielding. Rotation at yielding is evaluated through the formulations given in [35]. It is worth noting that displacement demand in RC members is typically low at the investigated LS, and in the analyses carried out in this paper no yielding of RC members was observed (for this reason the behavior after yielding is represented by a dashed line in Figure 2(a)).…”

Eurocode-based seismic assessment of modern heritage RC structures: The case of the Tower of the Nations in Naples (Italy)

“…Equation 1 leads to a reliable prediction of the yielding rotation for elements without seismic detailing and reinforced with smooth bars [19]. In the case of ultimate chord rotation ( u ), a reduction equal to (0.95/1.2) with respect to the value obtained from equation 2 was considered, because of the absence of seismic detailing and the presence of continuous smooth longitudinal bars [20]. On the other hand, the reduction factor assumed for  u , seems to provide a conservative estimation in the light of the additional experimental results shown in Verderame et al [21].…”

An Empirical-Based Approach for Modeling and Assessment of Rc Columns With Plain Bars

“…[1], [2], [3]). The post-elastic response of members with plain bars can be significantly different compared to members with deformed bars, due to the lower bond capacities [4] [5] that, for instance, lead to higher deformability contribution of the fixed-end-rotation mechanism [6] [7].…”

“…The largest part of models for capacity assessment and modeling of RC members provides the prediction of the response already including the degradation due to cyclic displacement, as in the present study. Among these, the studies by Fardis and co-workers, which have proposed empirical-based formulations for chord rotation at yielding and "ultimate" (at 20% strength drop) [10][11] [2], based on a large database of flexure-controlled experimental tests on RC elements. In the last years, several studies by Elwood and co-workers are focusing on the deformation capacity of existing non-ductile RC elements.…”

“…The European standard EC8 adopted Fardis and co-workers' proposals, including correction coefficients for ultimate chord rotation of non-conforming elements [18] [19], which account for their lower deformation capacity [20] [2]. The US standard ASCE/SEI 41-13 [21] provides a procedure for the failure mode classification and, accordingly, empirical deformation capacity parameters calibrated to satisfy a target failure probability, depending on the failure mode.…”