Influence of Steel Fibres on the Behaviour of RPC Circular Columns Under Different Loading Conditions

Abstract

An experimental program was conducted to investigate the effect of inclusion of steel fibres on the behaviour of Reactive Powder Concrete (RPC) columns. Three different types of steel fibre were used: micro straight steel fibre (MF), macro deformed steel fibre (DF) and waste steel fibre (WF) recovered from discarded tyres. In addition, a hybridization of steel fibres was made up to produce waste-industrial hybridization (WHF) (MF, DF and WF). Twenty reinforced RPC column specimens were prepared and tested under axial concentric, eccentric and flexural loading. Results of testing demonstrated that the ultimate axial load and the corresponding axial deformation increased effectively by the addition of steel fibres, especially at the presence of MF. For the flexural loading, the inclusion of WF and WHF increased the energy absorption of specimens by 470% and 453%, respectively, in comparison with the corresponding reference specimens. Axial load-bending moment (P-M) interaction diagrams were carried out. Results of testing show that WF is a promising material for enhancing the behaviour of RPC under different loading conditions. Abstract 10 An experimental program was conducted to investigate the effect of inclusion of steel fibres 11 on the behaviour of Reactive Powder Concrete (RPC) columns. Three different types of steel 12 fibre were used: micro straight steel fibre (MF), macro deformed steel fibre (DF) and waste 13 steel fibre (WF) recovered from discarded tyres. In addition, a hybridization of steel fibres 14 was made up to produce waste-industrial hybridization (WHF) (MF, DF and WF). Twenty 15 reinforced RPC column specimens were prepared and tested under axial concentric, eccentric 16 and flexural loading. Results of testing demonstrated that the ultimate axial load and the 17 corresponding axial deformation increased effectively by the addition of steel fibres, 18 especially at the presence of MF. For the flexural loading, the inclusion of WF and WHF 19increased the energy absorption of specimens by 470% and 453%, respectively, in 20 comparison with the corresponding reference specimens. Axial load-bending moment (P-M) 21 interaction diagrams were carried out. Results of testing show that WF is a promising material 22 for enhancing the behaviour of RPC under different loading conditions. 23 24 25interactions.26 30 rated as a concrete with excellent strength and durability [1, 2]. This type of concrete enables 31 the designers to reduce the size of structural members such us columns in lower stories and 32 consequently reduces the self-weight of the structure. However, RPC is identified with its 33 excessive brittleness. It was reported that the increase in the compressive strength of the 34 concrete results in an increase in the brittleness of the concrete. 36Helices are normally used to confine the core of the concrete columns. However, for high 37 strength concrete, the transverse reinforcement confinement is less efficient than in normal 38 strength concrete when used in columns [3][4][5]. Furthe...

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

“…To validate the axial load-bending moment interaction diagrams (P-M) that were developed analytically, a comparison was made with the axial load-bending moment interaction diagrams that were developed experimentally by Hadi and Al-Tikrite [25] and Al-Tikrite and Hadi [26].…”

“…The influence of steel fibre on the axially loaded members such as reinforced RPC columns has been investigated by Hadi and Al-Tikrite [25] and Al-Tikrite and Hadi [26]. It was reported that the inclusion of steel fibres in the reinforced RPC columns has effectively influenced the load carrying capacity and the ductility of the columns.…”

“…Nevertheless, the analytical axial load-bending moment interaction diagram of the RPC column reinforced with different types of steel fibres has not been investigated as yet. As such, this study ; as a complementary study for the studies conducted by Hadi and Al-Tikrite [25] and Al-Tikrite and Hadi [26]; investigate analytically the axial load-bending moment (P-M) interaction diagrams of the RPC columns that included different types of steel fibre (industrial and waste) in individual and hybrid forms. A stress-strain model for unconfined fibrous RPC was used to construct the P-M interaction diagrams.…”

“…A stress-strain model for unconfined fibrous RPC was used to construct the P-M interaction diagrams. The experimental investigations of Hadi and Al-Tikrite [25] and Al-Tikrite and Hadi [26] on the behaviour of RPC column reinforced with and without different types of steel fibres tested under concentric, eccentric and flexural loadings was used for validation. Also, the influence of the steel fibres properties such as aspect ratio on the performance of the fibrous RPC columns under different loading conditions is investigated analytically in this research paper.…”

Axial compression capacity analysis of prefabricated steel reactive powder concrete columns in prefabricated modular buildings

“…Shan et al (2018) studied the axial compression performance of concrete-filled RPC tube columns, and experimentally determined that the RPC tube gave effective play to the high strength of RPC and the confinement effect of the hoops. Al-Tikrite and Hadi (2018a) revealed that the addition of steel fibers could effectively increase the ultimate bearing capacity of RPC columns and reduce the axial deformation of the specimens, and also proposed an axial compressive stress–strain model based on the test results. Yan et al (2010) investigated the bond behavior at the interface between the RPC and the steel tube and developed a nonlinear finite element model for the contact interface.…”