Evaluating the Concrete Tensions Softening Model in Flexural Behavior

Fiber-reinforcement concrete is mainly distinguished in their behavior in cracked tension zone which is called tension softening behavior. wide researchers have been investigating this behavior and presented many tensioned softening models,whereas these models have not been compared together. this paper presents a compression between four tension softening models including constant,linear,bilinear and exponential models in flexural behavior. comparison of these models has been done in flexural behavior of rectangular section. in this study the behavior of rectangular beam section under four/three point bending test have been predicted by iteration procedure. these models have been compared in some parametrical properties and also with some existing experimental data. although models have unique fracture energy,the result of this study shows variety in result including peak load,area under load–deflection for used models. it presents that this method cannot be used for meaningful comparison and indicates concern in applied assumption that was referred in many papers. © 2017,iran university of science and technology.