Seismic Response of Reinforced Concrete Columns

Capacity Models for Shear-Critical Rc Bridge Piers With Hollow Cross-Section

“…Finally, the drift ratio at shear failure (DRs) is defined as that corresponding to a drop in lateral load equal to 20% of Vtest. This definition of the shear failure occurrence is consistent with that generally used in literature within the context of a displacement-based assessment ( [7], [9], [16]). When the shear strength does not drop below the 80% of Vtest, the DRs is taken as that corresponding to the maximum-recorded displacement (as in [9]).…”

“…(6) (6) Later, Elwood [9] introduced an empirical model based on the analysis of an experimental database of 50 tests collected by Sezen [7] and characterized by shear failure after flexural yielding. According to this model the drift at shear failure depends on axial load ratio, transverse reinforcement ratio and maximum nominal shear stress (ν), the latter assumed as the ratio between the maximum experimental shear value and the cross-sectional area (taken equal to B•d for solid sections).…”

“…Actually, the main degrading shear strength models are not adequate to estimate the displacement at shear failure, because they have been calibrated in order to obtain the best result in terms of shear strength given a displacement ductility. If the inverse process was performed, a small variation in shear strength corresponds to a large change in estimated drift ratio at shear failure [7]. Different drift capacity models aiming predicting drift at shear failure have been proposed during last decades, but all these models were developed for columns with solid cross-section.…”

The influence of coupled horizontal–vertical ground excitations on the collapse margins of modern RC-MRFs

“…8, which shows the case in which the shear strength is higher than the shear corresponding to the plastic hinges development and the model does not capture any shear degradation. Watanabe and Ichinose (1992), Aschheim and Moehle (1992), Priestley et al (1994) and Sezen (2002) have shown that the shear strength in RC elements decays with increased plastic deformations. Hence, the dashed line provided in Fig.…”

Experimental analysis and mathematical modeling of fracture in RC elements with any aspect ratio

“…Notice that the values of the first cracking shear force V cr and ultimate shear force V u in Fig. 9 can be indeed computed using RC theory [21][22] with a reasonable accuracy. Those values enable for the computation of the parameters s R 0 and s q in the shear crack resistance function.…”