Zusammenfassung
This study focuses on the use of explicit finite element analysis
tools to predict the behavior of fiber-reinforced polymer (FRP) composite
grid reinforced concrete beams subjected to four-point bending. Predictions
were obtained using LS-DYNA, an explicit finite element program widely
used for the nonlinear transient analysis of structures. The composite
grid was modeled in a discrete manner using beam and shell elements,
connected to a concrete solid mesh. The load-deflection characteristics
obtained from the simulations show good correlation with the experimental
data. Also, a detailed finite element substructure model was developed
to further analyze the stress state of the main longitudinal reinforcement
at ultimate conditions. Based on this analysis, a procedure was proposed
for the analysis of composite grid reinforced concrete beams that
accounts for different failure modes. A comparison of the proposed
approach with the experimental data indicated that the procedure
provides a good lower bound for conservative predictions of load-carrying
capacity.
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