Flexural behavior of prestressed concrete beams strengthened by near surface mounted FRP rods

Abstract EN

The applications of post tensioned concrete have increased and have now been used in
different regions of the world.

There are only few studies which have studied the behavior of
retrofitted prestressed concrete experimentally, with the major part of the studies focusing on
retrofitted reinforced concrete.

This research study is initiated by a desire to more fully
investigate the response of it.

This paper presents a parametric study established on a beam
with T-sec with web width 700 mm and a height of 1800mm, the thickness of the flange is
150 mm, the width of beam flange is 1500mm with span 29.6m.

The beam was simply
supported and loaded uniformly.

A total no.

of 20 finite element 3D models was generated
taking the all possible failure modes such as FRP rupture, concrete cover separation and
concrete crushing in order to study percentage of prestressing steel (Wp) parameter.

Finally, a
comparison is done between ACI 440.2R-08 code and the finite element results for the
ultimate failure load and the predicted failure mode 0.