Effect of hollow ratio and cross-section shape on the behavior of hollow SIFCON columns

Khamees, Shahad S.; Kadhum, Mohammed M.; Alwash, Nameer A.

doi:10.1016/j.jksues.2020.04.001

Cited by 9 publications

(7 citation statements)

References 15 publications

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“…This may be attributed to the high fiber content used in preparation of SIFCON and because of the capacity of hybrid fiber to bridge the crack. [43][44][45] Also, it can be noted from the test values in this table, that the type of cross section has been the most critical parameter influencing the ductility behavior of columns.…”

Section: Ductility Of Sifcon Column Specimensmentioning

confidence: 97%

Experimental investigation of fire effects under axial compression on ductility and stiffness of (SIFCON) columns

Kadhum

Hashim

Khamees

et al. 2022

Structural Concrete

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This article is an experimental study of the efficiency after fire exposure of slurry infiltrated fiber concrete (SIFCON) columns. The aim of this paper is to present a comprehensive study of the fire effect on the stiffness, ductility, and energy absorption capacity of axially loaded SIFCON columns and to inspect the effect of hollow ratio and cross section shape on the energy dissipation ability, ductility, and stiffness features of the post-fire behavior of these columns. Hybrid fibers were used to cast SIFCON columns with 6% fiber ratio (3% hooked end fiber + 3% straight micro fiber). The results showed that the cube compressive strength decreased by 25.1% and 53% when exposed to fire at a temperatures of 600 and 900 C, respectively. The results obtained revealed that after exposure to fire, the indices values of displacement ductility are not strongly impaired and it has been shown that the assessment of the energy dissipation ability is more relevant in this situation. Whereafter fire exposure at 600 C, the SIFCON columns lost about 11%-31% of the energy absorption capacity and about 39%-57% after fire exposure at 900 C. In comparison, after fire exposure, the secant and initial stiffness greatly degraded and the reduction percentages became higher with a rise in fire temperature from 600 to 900 C.

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Section: Ductility Of Sifcon Column Specimensmentioning

confidence: 97%

Experimental investigation of fire effects under axial compression on ductility and stiffness of (SIFCON) columns

Kadhum

Hashim

Khamees

et al. 2022

Structural Concrete

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“…It is also evident from the experiment results that the strengthened SIFCON columns' ultimate mid-height lateral displacement is higher than that of the NSC columns. This may be because of the high deformation of the strengthened SIFCON columns prior to failure [17]. Figure 8: An example of the load-displacement relationship of NSC column and strengthened with SIFCON column.…”

Section: Column Specimen Load-displacement Relationshipsmentioning

confidence: 99%

Experimental Study on the Behavior of Axially Loaded Reinforced Concrete Square Columns Strengthened with SIFCON Shell

Adnan,

Alwash,

Kadhum

2023

E3S Web Conf.

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Slurry infiltrated fiber concrete (SIFCON) is an advanced generation of fiber-reinforced concrete (FRC) with higher fiber content. SIFCON offers excellent potential for use in areas that require high ductility and impact resistance, particularly when designing seismic retrofits and repairing or strengthening structural reinforced concrete members. This study investigated the behavior of square normal strength concrete (NSC) columns of grade M35 strengthened with SIFCON shell and compared them with unstrengthen NSC. The effect of different SIFCON shell thicknesses (2 and 3) cm, fiber type and volume fraction (4 and 6%), and tie spacing (8 and 16) cm were studied. The fiber types employed were polypropylene and hooked-end steel fiber. Eleven columns were cast and tested for the current investigation in two groups, where the first group (control specimens) consists of two unstrengthen NSC columns and one square NSC column strengthened with a 2 cm SIFCON shell with a 6% steel fiber ratio. The second group comprises eight NSC columns strengthened with a hybrid fiber SIFCON shell. The NSC square columns had dimensions of (8x8x80) cm. 3 cm SIFCON shell thickness was observed to evolve the strengthen columns' load-carrying capacity and energy absorption. The maximum load achieved is about 223% as compared with unstrengthened NSC columns. The energy absorption was about 16 times that of the control. At the same time, the stiffness of strengthened columns is less than that of NSC columns.

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“…In this context, Shadmand et al [18] mentioned that the ductility represents the one of the materials properties which can be defined as the ability of material or a Torsion at all the out of plane parts member to undergo large deformations without significant resistance loss or rupture before collapse. In concrete structural members, it is can be obtained by the ratio of steel reinforcement within it; because mild steel is a ductile material that can be bent and twisted without rupture [19,20]. Ductility of structural member in experimental work can be estimated in terms of ductility index.…”

Section: 2 Displacement Ductility Indexmentioning

confidence: 99%

Comparative Study on Structural Behavior of Reinforced Concrete Straight Beam and Beams with out of Plane Parts

Mohsin

Alwash

Kadhum

2021

IJE

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Effect of hollow ratio and cross-section shape on the behavior of hollow SIFCON columns

Cited by 9 publications

References 15 publications

Experimental investigation of fire effects under axial compression on ductility and stiffness of (SIFCON) columns

Experimental investigation of fire effects under axial compression on ductility and stiffness of (SIFCON) columns

Experimental Study on the Behavior of Axially Loaded Reinforced Concrete Square Columns Strengthened with SIFCON Shell

Comparative Study on Structural Behavior of Reinforced Concrete Straight Beam and Beams with out of Plane Parts

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