Stress–Strain Relationship of Unconfined RPC Reinforced with Steel Fibers under Compression

Axial-flexural interaction diagram of RPC columns reinforced with steel fibres

“…To adequately present the behaviour of the RPC columns analytically in comparison with the experimental results, a proper stress-strain model that takes into account the strength of the concrete and the influence of different types of steel fibre of different geometry and volume content must be applied. Al-Tikrite and Hadi [31] investigated the applicability of applying the existing stress-strain models proposed in the literature on the unconfined RPC reinforced with different types of steel fibre of different types of steel fibre of different geometry and volume content. Al-Tikrite and Hadi [31] concluded that the influence of the properties of steel fibers on the behavior of concrete under compression is not well presented in the models that were proposed in the literature.…”

“…Al-Tikrite and Hadi [31] investigated the applicability of applying the existing stress-strain models proposed in the literature on the unconfined RPC reinforced with different types of steel fibre of different types of steel fibre of different geometry and volume content. Al-Tikrite and Hadi [31] concluded that the influence of the properties of steel fibers on the behavior of concrete under compression is not well presented in the models that were proposed in the literature. The applicability of the empirical stress-strain models on the unconfined RPC that included different types of steel fibers of different properties is not adequate.…”

“…The applicability of the empirical stress-strain models on the unconfined RPC that included different types of steel fibers of different properties is not adequate. As such, Al-Tikrite and Hadi [31] have proposed a stress-strain model for RPC reinforced with different types of steel fibre of different geometry and volume content. The proposed model used in this study is specifically designed for reactive powder based concrete reinforced with different types of steel fibre of different geometry and volume content where no coarse aggregates is included and the influence of steel fibre are very apparent in the behaviour of this type of concrete (See Fig.…”

“…1). Consequently, the axial load-bending moment interaction diagrams (P-M) of the RPC columns were developed analytically by applying the stress-strain relationship model for unconfined RPC that was proposed by Al-Tikrite and Hadi [31]. For RPC columns tested under eccentric and flexural loadings, the layer-by-layer numerical integration method was used to analyse the columns' cross section.…”

“…The stress in each concrete strip was determined by modelling the whole cross section analytically as unconfined cross section using the continuous axial stress-strain curve that was proposed by Al-Tikrite and Hadi [31] as presented as follows:…”