Hysteretic Shear Model for Reinforced Concrete Members

A Model for Non-Linear Dynamic Analysis of Sub-Standard Reinforced Concrete Members

“…The localisation of post-peak shear strains is herein called "shear failure localisation" [22]; in essence, it mainly represents the relative rigid body displacement between the discrete upper and lower bodies of the column along the shear crack (Figure 3). The hysteretic rules adopted in the shear sub-model are based on those of Ozcebe & Saatcioglu [4], with several improvements. Pinching, unloading and reloading stiffness deterioration, as well as post-peak cyclic strength degradation, are accounted for.…”

“…Cyclic strength degradation is taken into consideration in the post-peak domain using the Ozcebe & Saatcioglu [4] rules. However, that creates a permanent loss of strength, which distorts the produced descending branch and leads to slightly premature onset of axial failure in the case of shear strength reaching zero (Figure 7a).…”

“…However, that creates a permanent loss of strength, which distorts the produced descending branch and leads to slightly premature onset of axial failure in the case of shear strength reaching zero (Figure 7a). A compensation algorithm has been employed, in order to avoid this shift; instead of aiming at the previous vertex deformation with a reduced vertex strength, as originally proposed [4], the target is the intersection of that line and the descending branch; hence, the resulting behaviour is as intended (Figure 7b). Besides strength degradation, pinching as well as unloading and reloading stiffness deterioration are accounted for using the same set of rules as described in [4].…”

“…It has been observed experimentally that in regions of inelastic flexural deformations, shear strength degradation is triggered even if no shear yielding has taken place [4], [5] and that even if shear demand does not increase, shear deformations may increase considerably [3]. This impacts the response of flexure-shear critical members that fail in shear after experiencing flexural yielding.…”

Damage Analysis of Reinforced Concrete Structures with Substandard Detailing

“…Furthermore, it has been shown experimentally [17,18] that shear distortions in the plastic hinge regions may increase rapidly ("shear-flexural yielding") subsequent to flexural yielding, despite the fact that shear force demand remains almost constant, as it is controlled by flexural yielding. The combination of these phenomena is defined herein as shear-flexure interaction effect.…”