EFFECT OF PRE-DAMAGE ON CONFINED CONCRETE AT ELEVATED TEMPERATURES

摘要

Evaluation of mechanical properties of damaged confined concrete at elevated temperature finds its applications in development of constitutive models essential for carrying out numerical analysis of earthquake damaged structures.In this regard, uniaxial compression tests were conducted on number of pre-damaged circular columns at elevated temperatures.Two levels of confinement, C1 and C2 were considered in the investigation.Damage was induced in the specimens by loading them up to three pre-defined levels, D1, D2 and D3 corresponding to three levels of strain: 0.0033, 0.0056 and 0.008 respectively.Mechanical properties such as stress-strain curves, modulus of elasticity and peak stress are re-established by considering the factor of damage.