ANALYSIS OF BONDING MECHANISMS OF SMOOTH AND LUGGED FRP RODS EMBEDDEDIN CONCRETE

The bond behavior of two fundamental types of FRP reinforcement for co ncrete-smooth rods and lugged rods-has been investigated by examining experimental data and developing detailed finite-element models of the se simple rod/concrete systems. The bond controlling parameters, ident ified by direct pull-out tests on embedded rods, were built into the m odels so that analytical studies of the effect of each parameter on bo nd could be carried out. The viability of the finite-element models, c reated by the use of commercial finite-element programs, was verified by comparing the predicted and experimentally obtained load versus sli p and/or load versus longitudinal strain data. The models were used to predict the behavior of environmentally degraded rods. The moire' met hod of strain analysis was used to investigate full-field, local strai n distributions in flat, lugged rods embedded on the surface of concre te. (C) 1998 Elsevier Science Ltd. All rights reserved