In this study, effects of reinforcement corrosion such as reinforcement cross section reduction, steel yield strength and concrete compressive strength reduction on RC member capacity decrease are studied. Next, a two-dimensional reinforced concrete moment resistant frame is modeled to evaluate the effects of moderate and severe intensity corrosion on moment-curvature behavior of elements and structure seismic response under nonlinear analysis. Structure capacity curves in push-over analysis and failure curves resulted from IDA for both the structure without and with corrosion are obtained and the effects of reinforcement’s corrosion on the reinforced concrete frame seismic performance are determined through comparing the results. The results revealed that in terms of amount, place and type of corrosion in the reinforced concrete frame, value of the reduction resisting moment of elements is different. Furthermore, the outcomes of nonlinear analyses showed that the capacity of structure is reduced and its seismic performance level is changed as a result of corrosion.
Large dams and their facilities are a part of the infrastructure of any society, and a huge amount of financial and human resources of the community are consumed to build them. Among the various types of dams, optimum design of concrete gravity dams requires special attention because these types of dams require a huge amount of concrete for their construction. In contrast, design optimisation of concrete gravity dams with regard to conditions and limitations, as well as geometric variables, can be complicated. With the appearance of various optimisation methods in recent decades, some researchers have worked on optimum design of dams. The objective of this study is to create an optimum design concrete gravity dam using a new method. For this purpose, a design methodology is proposed. According to the proposed method, a computer program is developed which carries out the optimisation process automatically. Also, numerical problems have been studied and the results obtained by the developed method have been compared to earlier studies in the literature. The results of this research study show that the novel developed method is very effective for the optimum design of gravity dams.
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