Experimental Structural Analysis of Hybrid Composite-Concrete Beams by Digital Image Correlation (DIC) and Acoustic Emission (AE)

The use of composites such as textile reinforced
cements (TRCs) and fibre reinforced polymers (FRPs)
enables the development of lightweight structures. Such
a lightweight solution for floor renovation consists of
a hybrid composite-concrete cross section: prefabricated
beams (TRC–CFRP reinforced hollow boxes with concrete
on top) support sandwich panels together with a finishing
concrete compression layer creating a monolithic hybrid
floor. As the hybrid beams are the main structural element
of this floor system, their load-bearing and failure behaviour
should be fully understood. In order to examine the optimal
design of these structures in terms of load bearing capacity,
the beams are separately tested in four point bending
while the amount of CFRP reinforcement and the concrete
thickness are varied. The digital image correlation (DIC) and
acoustic emission (AE) measuring techniques are applied
in a complimentary way to monitor the bending and failure
behaviour of the full scale hybrid beams. DIC visualises
the development of surface strain fields together with the
exact cracking patterns in relation to the applied load. AE
contributes in defining the load at the onset of serious cracking
activity. Furthermore, AE characterizes the contribution
of the different fracture modes that may vary from concrete
cracking, delamination between the successive layers of the
TRC or debonding at the interphase between the TRC hollow
box and the concrete on the one hand and the CFRP on the
other hand.

Jaar van publicatie:2016

Trefwoorden:Digital image correlation (DIC), Acoustic emission (AE), Hybrid composite-concrete beams, Textile reinforced cements (TRC), Bending

CSS-citation score:1