چكيده به لاتين
Problems related to structural durability and performance have been underestimated for a long time. In fact, the main emphasis was on mechanical properties and structural capacity, while durability design, constructional quality and demolition cycle management were neglected. In order to improve structural durability, it is necessary to use a design method so that it can be clearly constructed of safe, economical and durable structures, and will estimate their lifetime costs. One of these methods is design based on performance. This method is related to bearing capacity, toughness and working ability. Usually, performance criteria are defined as the conditional limit. The conditional limit is the boundary between the desirable and undesirable conditions of a structure in the various situations that structures face during their lifetime. Extreme conditions can be defined by the designer. A probabilistic model is proposed to determine the probability that a structure is able to meet performance requirements regards to a certain level of reliability. The probabilistic model is based on realistic mathematical models, in which the behavior of concrete structures is modeled, for example, chloride penetration results in the corrosion of reinforcments and thus reduces the load capacity. The main purpose of this thesis is to study the probabilistic models considered by Iran's regulations, fib and ACI for analyzing reinforced concrete durability in marine conditions, and how the parameters in the model affect the durability analysis. To make a probabilistic model has been selected to consider the inherent variation associated with measuring heterogeneity of materials and the diversity of environmental factors. The goal is to help designers understand the effects of their decision-making on durability. Another goal is to use performance criteria to specify the parameters for assessing the durability of concrete.
