The present work studies the flexural behavior of a new type of staying in place (SIP) forms which
could be used for beams in future buildings. Six specimens were prepared with (SIP) and tested
under four points bending loads. The first group contains two specimens; both of them are supplied
with inverted FRP U shape strips to improve the bond between FRP form and concrete. The first
specimen contains a PVC tube without reinforcing while the second specimen contains a PVC tube
wrapped by three layer of GFRP sheets. The second group contains two specimens; both of them
are prepared with upper FRP hooks to improve the bond between FRP form and concrete. Also, the
first specimen of the second group contains a PVC tube without reinforcing while the second
specimen contains a PVC tube wrapped by three layers of GFRP sheets. The third group contains
two specimens; both of them are prepared with upper FRP hook and have three layers of CFRP in
the bottom inner face of the form. Both specimens contain unreinforced PVC tube, and the second
specimen is prepared with transversal FRP links to improve the bond between FRP form and
concrete. The experimental results included ultimate load, load-deflection and load-strain
relationships, also; the cracking behavior and failure mode were observed and recorded. The
experimental results showed an improvement in the flexural strength of the tested specimens as
FRP reinforcement is added to PVC tube or to the form. Also, using FRP hook was the best
technique to improve the bond between FRP form and concrete.
Moreover, the tested specimens were simulated numerically using ANSYS (version 15). The
ultimate loads according to the numerical simulation were higher than the corresponding
experimental results by 5% to 38%. |
