The the increase in the grade of concrete

The first part of
this paper introduces the stress-strain relationship of concrete using
Hognestad Model (1951) and stress-strain model for Grade 60 steel (Priestley et
al. 1996). A control specimen 350 x 450 mm reinforced concrete beam along with
the material properties is established as the basis of the study. With the aid
of the Models, the intention of this paper is to investigate the impact of the properties
of the materials such as the compressive strength of concrete, the yield
strength of steel, amount of reinforcement, the dimensions of the beam in the
behaviour of the reinforced concrete beam from unloaded state to crack
initiation state, flexural yielding and ultimate state.  The results are obtained using a spreadsheet
program and are presented using diagrams and tables.

The second part of
this paper aims to present the moment-curvature diagram using the same beam
section, that of the control specimen. The Kent and Park Model (1971) for
concrete is used with analytical Models for steel such as SD685 steel (Wang et
al. 2009), Grade 60 steel (Priestley et al. 1996) and A1035 (ACI Innovation
Task Group 6 (2010). In addition, experimental data for SD685, A1035 and Grade
60 are also used in the presentation of the moment-curvature relationship. A
spreadsheet program is used for the necessary calculations and the presentation
of the diagrams. Through the results, it was observed that the reduction of the
area of tensile reinforcement reduces the flexural strength but increases its
flexural ductility, the decrease of compression reinforcement area in an RC
beam decreases its flexural strength and ductility, the use of high strength
steel increases the flexural capacity of the beam but reduces the flexural
ductility significantly,  the increase in
the grade of concrete could increase the flexural ductility granting flexural
strength is the same, it could also increase the flexural strength at equal
flexural ductility or it could add to both flexural strength and flexural
ductility. The study also justifies the use of the models that can
satisfactorily approximate the actual behavior of RC beams.

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