Title of article :
Seismic response evaluation of reinforced high strength concrete columns based on the modified constitutive model
Author/Authors :
Shafei Erfan نويسنده , Vahid-Vahdattalab Farzin نويسنده Urmia University , Mokari Rahmdel Javad نويسنده Urmia University of Technology
Abstract :
The current study deals with strength and seismic ductility assessment of
reinforced High-Strength Concrete (HSC) columns. We have studied the nonlinear response
of HSC columns with various reinforcement and axial force ratios subjected to cyclic
loading. The study consists of primary verication of mathematical nonlinear model and
further calibration to ensure the required accuracy. The existing experimental work is
assumed as verication pilot that consists of four columns. Column members dier in
the strength and axial force. Concrete has 63.1 MPa mean strength and 0.3% crushing
strain. The longitudinal and transverse reinforcements are based on ACI 318 regulations in
experiment. We have used the nonlinear ber-element code in OpenSees environment for
the modeling and analysis of models. The existing proposed stress-strain curve is modied
to ensure the validity of assessment. Calibration procedure has led to conclusion that
the post-yield slope needs to be modied in HSC model as the average value of ACI 363
reference. We have developed twelve extra models to estimate the interaction of concrete
strength, rebar ratio, and axial force eect on the seismic performance. Parametric study
of calibrated models reveals that the seismic energy dissipation in HSC members is the
function of the provided longitudinal reinforcement ratio and lateral conning stirrup
amount
Journal title :
Astroparticle Physics