stress-strain curves for fibre-reinforce concrete
stress-strain curves for fibre-reinforce concreteABSTRACT The paper examines the effects of the addition ofvarious fibres, including fibrillated polypropylene as well asround straight, Duoform, crimped and hooked steel, on thecompressive stress-strain properties of a basic concrete matrix. The ultimate compressive strengths of cube, equivalentcube and prism specimens, with MGA pads to reduce platenfriction, are shown to be only slightly affected whereas thefracture toughness of the fibre reinforced specimens isincreased considerably for all fibres. …
Stress-strain model for concrete under cyclic loading
Stress-strain model for concrete under cyclic loadingA hysteretic stress–strain model is developed for unconfined concrete with the intention of providing efficientmodelling for the structural behaviour of concrete in seismic regions. The proposed model is based on thefindings of previous experimental and analytical studies. The model for concrete subjected to monotonic andcyclic loading comprises four components in compression and tension – an envelope curve (for monotonic andcyclic loading), an unloading curve, a reloading curve and a transition curve. Formulations for partial unloadingand partial reloading curves are also presented. The reliability of the proposed constitutive model is investigatedfor a reinforced concrete member using a non-linear finite-element…