Behavior of RC columns incorporating with steel and recycled plastic fibers under eccentric load: An experimental work

Abstract

There was a dearth of research into the behavior of eccentric RC columns reinforced with fibers, particularly recycled plastic fiber (RF) reinforced columns. The effect of employing end hooked steel fiber (EF) and RF on the performance of eccentric columns was explored in this experiment. Under compressive eccentric load, eight RC columns of 150 × 150 × 1000 mm with a 2% longitudinal reinforcement ratio were tested up to failure. The ratio of load eccentricity to column dimension was 15%. The fiber content (Vf) was variable. Both EF and RF had a Vf of 1%, 2%, and 3%. The applied load was recorded axial/lateral displacement and transverse/longitudinal reinforcement strain. The ultimate load (Pu), ultimate displacement, yield load, stiffness, and ductility index (∆) were all calculated to investigate column behavior. Results showed that adding fibers prevented the concrete cover separation hence prevented the sudden failure as it happened in the control column without fiber (P0). 1% RF and 2% EF enhanced Pu by 10.4% and 34.8%, respectively, while fiber content 3% decreased Pu. Stiffness of columns containing 1% RF and 2% EF was 16.3% and 33.8% higher than that of P0, respectively. The use of 1% and 2% EF delayed yield load, resulting in improved column performance. All fiber contents significantly improved ductility, with enhancement rates ranging from 4.2% with 3% RF to 146.2% with 3% EF. Also, use of 1% RF increased ductility by 70.6%.

Investigation of the Mechanical Behaviors of Sustainable Green Reactive Powder Concrete Produced Using Ferrochrome Slag and Waste Fiber

“…Previous studies have also addressed the effect of fiber geometry and ratio on mechanical properties. It has been mentioned that appropriate fiber geometry, which will strengthen the peeling, has a positive effect on the mechanical properties and increases the ductility [37,38,56,57]. In the flexural test, the fracture is sudden with the formation of cracks in the nonfibrous samples as in conventional concretes.…”

Eco-friendly concrete produced with recycled materials

“…Fiber adding with 1% led to improve splitting tensile strength by 40.6%, 49.1%, and 32.6% for waste plastic fiber, waste steel fiber, and the waste plastic and steel fiber together respectively. These results may be due to the high tensile strength of waste steel fiber compared with waste plastic fiber, so the concrete with steel fiber presented higher tensile strength [17].…”

Analysis and Predictive Evaluation of Mechanical Properties of Steel Anchor Box for High-Speed-Railway Cable-Stayed Bridge

“…Because the steel anchor-box structure mainly transmits the cable force through the weld between its support plate and the main girder web, the stress state and stress level of each key plate in the steel anchor box are mainly determined by the stress state of the corresponding weld. At the same time, compared with the plate, the stress-concentration problem at the weld position is more prominent, which is one of the main of steel anchor boxes [15]. In order to quantitatively study the force-transfer mechanism of the built-in double-fixed cable-girder steel anchor box, three parameters were introduced: the shear-stress-inhomogeneity coefficient µ of the weld, the transfer ratio p, and the total transfer ratio P.…”