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<doi>10.14455/ISEC.2019.6(1).STR-23</doi>
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<article-title>FLEXURAL DUCTILITY OF STRUCTURAL<br/>
CONCRETE MEMBERS SUBJECTED TO LIMITED<br/>
CYCLES OF REPEATED LOADING
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<author>NAZAR OUKAILI and MOHAMMED KHATTAB </author>

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Dept of Civil Engineering, University of Baghdad, Baghdad, Iraq
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<abstract>
<title>ABSTRACT</title>
<p>For structural concrete members that may expose to serious earthquake, overload or
accident impact, the design of ductility must be given the same importance as the
flexural strength. The aim of this investigation is to study the change in ductility of
structural concrete flexural members during their exposure to limited cycles of repeated
loading. Twenty full-scale beam specimens have been fabricated in to two identical
groups; each group consisted of ten specimens. The first group was tested under
monotonic static loading to failure and regarded as control beams, while the specimens
of the second group were subjected to ten cycles of repeated loading with constant load
interval, which ranged between 40% and 60% of ultimate load. Specimens in each
group were categorized as follows: two traditional reinforced concrete specimens with
different intensity of tension reinforcement; three partially prestressed specimens with
bonded strands; three partially prestressed specimens with unbonded strands; and two
fully prestressed concrete specimens. The main variable, which was considered for all
specimens was the partial prestressing ratio (PPR). It was observed that, the ductility
of reinforced concrete beams was insignificantly increased during subjecting to limited
repeated loading. For fully prestressed and partially prestressed concrete beams with
high level of PPR, the ductility was significantly enhanced, while, it was decreased for
specimens with small level of PPR. </p>
<p><italic>Keywords: </italic>Curvature, Deflection, Rotation, Flexural members, Bonded strands,
Unbonded.</p>
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<hpdf>STR-23</hpdf>
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