Multifiber finite element model based on enhanced concrete constitutive law to account for the effects of early age damage on the seismic response of RC structures

RC structures get damaged over time due to several phenomenons such as shrinkage, thermal deformations, creep and corrosion. This damage starts at early age continues during the lifetime of structures. In order account for effects on seismic response structures, a research project combining both an experimental numerical part was conducted. part, two types portal frames that evolved either in endogenous conditions (by covering them using plastic sheet limit drying shrinkage) or non-endogenous (no imposed covering, thus similar site constructions) age, were constructed tested end 28 days static cyclic pseudo-dynamic tests. Experimental tests performed monitoring techniques used (ambient vibration, digital image correlation, optical fiber) showed shrinkage can cause increase vulnerability (50% decrease fundamental frequency, 33% lateral drift increase). article presents multifiber finite element model based enhanced constitutive law which allows describing creep, mechanical strains simulate dynamic frames. The resolution THC (Thermo-Hygro-Chemical) problem calculating temperature evolutions. model, is calculated three viscoelastic Kelvin Voigt models series with μ concrete (through internal equilibrium fiber level) whereas steel accounted Menegotto model. Results obtained compared ones validate proposed