Structural Performance of Reinforced Concrete Beams Reinforced With Tmt Bars
Date
2007
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Department of Civil Engineering
Abstract
TMT (Thermo Mechanically Treated) rebar has been in use in Nepal for last couple of
years. There has been a state of confusion among designers to go into TMT or still use
CTD (Cold Twisted Deformed) bars. It is the right time to investigate the comparative
performance of TMT reinforced structural member and compare its performance to
similar CTD counterpart. In this research work, eight reinforced concrete beams of size:
2000 mm × 230 mm × 300 mm. Four of them were reinforced with TMT bars from local
market and the other four with CTD bars. The reinforcement detail in all the beams are
identical including shear reinforcement; except four had TMT and other four had CTD
longitudinal bars. Out of four in each case, two were tested in monotonic loading and the
other two were tested in cyclic loading using Universal Testing Machine. The crack
propagation pattern in all the eight beams was almost similar. The load deflection curve
showed clear system yielding in case of TMT where as it was having smooth path in case
of CTD. All the beams showed failure mode as crushing of concrete as designed except
one which failed in shear. It was noted that the ratio of deflection of the centre point of
the beam at the crushing load to that at the yielding load were more or less similar for
both TMT and CTD reinforced beam. TMT reinforced beams showed greater ultimate
load which was due to its higher strength. In both the TMT and CTD reinforced beams,
the monotonically loaded beams showed greater ultimate load than the corresponding
cyclically loaded beam. This investigation showed that the TMT reinforced structural
beams behave more or less similar structural performance up to the rupture of tension
reinforcement.
Description
Keywords
Reinforced Concrete, Beams Reinforced, Tmt Bars