Compressive Shear Strength of Reinforced Concrete Walls at High Ductility Levels

Abstract

The amount of energy dissipated during an earthquake depends on the type of failure of the concrete element. Shear failure should be avoided because less energy is spent than that due to bending failure. Compression controlled failure is usually avoided by increasing the thickness of a wall. Considering that the current code largely decreases this strength, this becomes hard to achieve in practice. Because of that, the analysis described in this paper is made to determine the reason for a large strength reduction at high curvatures. Mechanisms contributing to compression controlled shear strength are analysed. Using Rankine’s strength theorem, section equilibrium, arch mechanism and bending moment-curvature diagrams, the influence of different parameters are observed and charted. The findings are compared to the existing procedures and a new, simple and safe analytical equation is derived. Compression controlled shear strength is mainly influenced by axial force, followed by the amount of longitudinal reinforcement and the achieved confinement. Results show that the value of strength reduces significantly with the increase of ductility and that some reduction exists even for lower levels of curvature. Current code provisions may lead to unsafe design, so designers should be careful when dealing with potentially critical walls.

Ductility of Concrete Beams Reinforced with FRP Rebars

“…The procedure described in the following subsections is based on the procedure explained in [64]. That procedure was then expanded in [65] to consider more complex sections. In this paper, the procedure is expanded to consider the influence of confinement on the behavior of sections.…”

“…In this paper, focus will be on reinforced concrete beams which have low or zero axial forces, so it plays little importance and will not be explained further. Detailed background of how axial force should be added to the model is explained in [65]. For columns, confinement of the whole element is usually made, not just the compression area.…”

A Review of Emerging Technologies for an Assessment of Safety and Seismic Vulnerability and Damage Detection of Existing Masonry Structures

“…In this regard, the continuous assessment and monitoring of the seismic safety and vulnerability of buildings is a challenging task, especially when large-area evaluations are required [3]. The construction sector plays a significant role in the alleviation of the effects and consequences caused by earthquakes and new technologies, products, systems, design approaches are regularly introduced to a broader community [4][5][6][7][8][9][10][11][12].…”

Influence of Concrete Compressive Strength on L-Shaped Shear Wall Performance in Buildings within High-Seismicity Zones

“…The efficiency of the concrete element is inherently linked to the quality of the concrete (Kišiček et al, 2020). Indeed, the assessment of concrete efficiency relies largely on compressive strength, which is one of the key indicators (Merabti., 2022).…”