Effect of Cyclic Loadings on the Shear Strength and Reinforcement Slip of RC Beams
Abstract: Numerous studies of
the response of reinforced concrete members under cyclic loadings, many of
which have been summarized and have indicated that, in general, the flexural
strength of under-reinforced beams remains unimpaired under cyclic loadings
consisting of a reasonable number of cycles. However, there is a body of
evidence indicating that their shear strength may suffer under such loadings.
The first objective of the current study is to construct an accurate 2D shell
finite element model of reinforced concrete beams under cyclic loadings. The
second objective is carrying out a parametric study on reinforced concrete
beams, using the suggested 2D shell model.
The objective of this study was to observe the effect of the stirrup
spacing, steel-to-concrete bond properties on the performance of reinforced
concrete beams under cyclic loadings. For this purpose, an efficient and
accurate finite element model was established taking into account the
compression and tensile softening introducing damage in the concrete material,
the Baushinger effect using nonlinear isotropic/kinematic hardening in the
steel and an adequate bond-slip law for the concrete–steel interface. The
simulated results of numerical models were verified by experimental results
available in literature in order to validate the proposed model, including
hysteretic curves, failure modes, crack pattern and debonding failure mode. The
model provided a strong tool for investigating the performances of reinforced
concrete beam. The results showed that: Cyclic loadings may change the failure
mode of the beam to bond failure even though it has sufficient bond length to
resist static loadings. So that under cyclic loadings additional anchorage
length must be taken, cyclic loadings also influence the ductility and peak
load for beams fail in shear. All these topics are of the utmost importance to
RC behaviour to be considered by construction codes.
Keywords: Finite Element
Models; Reinforced Concrete Beams; Damage; Plasticity; Cohesive Model; Cyclic
Behavior
Author: Mohammed A Sakr
Journal Code: jptsipilgg170015
