Abstract:
Hybrid reinforcement is partial replacing of steel rebar with other bars such as fiber
reinforced polymer (FRP) rebar in civil engineering structures. FRP reinforced concrete
structures adopt non-corrosive nature and high tensile strength with lightness. However, FRP
is low modulus of elasticity which tends to brittle. Hybrid reinforced concrete beam with
spiral shear reinforcement offers advantages by replacing ties with rectangular spiral shear
reinforcement.
This thesis work presents numerical investigation on hybrid reinforced concrete beam with
rectangular spiral shear reinforcement. Experimental result reported in literature was used for
validation analysis using ANSYS finite element analysis software program. Further,
parametric studies were performed on spiral spacing, span to depth and spiral angles of
inclination, bar arrangement and effective reinforcement ratio by developing FE models of
twenty hybrid RC beams with rectangular spiral shear reinforcement and four control RC
beams with closed stirrups under four-point bending loading.
The maximum load of FE analysis and the experimental results shows good agreement with a
minimum deviation of the percentage error is 0.4% or corresponding ratio of ultimate loads
of the tested specimen. Replacing the tie with rectangular spiral shear reinforcements
enhanced the load-carrying capacity of the hybrid reinforced concrete beams in between (0.5-
11.12) in percent and mid-span deflection at about (0.89-12.12) in percent. The spiral angle
800
is most effective angle of inclination to determine the load carrying capacity of hybrid
beam with rectangular spiral shear reinforcement. Hybrid RC beams with rectangular spiral
shear reinforcement spiral spacing 200 mm exhibited (1.27-11.3) in percent less load
resistance than corresponding beam with spiral spacing 150 mm
